Why the Nissan QR25 Engine is Still Being Used Over 20 Years Later

In this video we tear down a Nissan QR25DE engine to see what’s inside and how it works!
The Nissan QR25 engine is a 2.5L 4 cylinder engine. It is most commonly found in the Nissan Altima and Nissan Rogue, amongst other popular vehicles. It uses a timing chain driven variable valve timing camshaft on both the intake and exhaust sides. The intake uses tumble flow control flaps to promote mixing.
The engine layout is generally simple, using a plastic valve cover and aluminum alloy head, block and timing cover.
More importantly, the QR25DE engine has been around since the early 2000’s. Nissan has built upon it and improved it over the years increasing its power and efficiency while reducing emissions with the addition of direct injection. One distinguishing feature is that Nissan chose to use a ladder-frame bottom end design, which instead of using separate main bearings uses a ladder structure to secure the crankshaft. This is good for strength and rigidity and means the engine should be able to take more abuse.
The engine in this video was from a 2014 Nissan Altima that was totaled and was a working engine when pulled.
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[@emeyer6963]

Nissan recommends that the owner replaces the CVT every other oil change

[@danielhamby9448]

No kidding my friend Jeff did a fluid change in his 2022 Altima every 10k miles and it still failed at 50k. He never raced it or drove hard and a lot of those miles were highway…

[@JCal1968]

I'm not even a mechanic but your videos are so thorough I feel like I could be one.

[@speedkar99]

Im not mechanic either

[@ddddddd5425]

@@speedkar99 lol for real? i feel like just learning one of these engines would take like 10 years, and you're covering so many engines and parts on your channel it blows my mind.

[@lukesylvester2022]

​@@ddddddd5425 Not really. Start learning how smaller more simpler motors work and you can kinda understand these

[@kowalski161]

Recently, a 2007 Nissan Frontier clocked in over a million miles, with this exact 4 cylinder engine. The timing chain was replaced at 700K miles, one clutch (a five speed tranny). Oil changes every 10K miles. Sounds like a pretty good engine to me. Ty for another awesome video.

[@reynaldohernandez1425]

@kowalski161 That gives me hope. I have an 07 frontier with the same engine. 290k no oil consumption yet.

[@1997mass]

Very torquey engine, at least in the rogue

[@sdjnwhyNZ]

2011 qr20de engine owner here. I've made a mistake on my engine last year forgot to change oil and that thing drove my van with only 3.5L oil for almost a year! But when I changed oil and fill it back up, the whole noise went down straight away and the acceleration is nice and smooth. That thing came back to normal! I was planning to replace my van. But after doing some studies of that engine and the re5r05a transmission came with it, I decided to hold onto the van and take good care of it.

[@danielhamby9448]

Didn’t he tow with it too? It’s at some Dealership somewhere and they gave him a new one for free… he probably would’ve been better off keeping it over getting the new one

[@Resistculturaldecline]

​@danielhamby9448 I don't think the owner mentioned anything about towing or not towing. I'm assuming he didn't, or at least he didn't tow much. The reason I assume, is because it was an expedite delivery vehicle in an around Chicago. And, because the factory clutch went 700k

[@powerofone1645]

Another great tear down. Best mechanic info to be had on KZbin. 10/10

[@jasonpocaro2730]

I've NEVER had to replace one of these engines. As long as oil & coolant inside it? It will last WAY over 200,000 miles. No Joke. Extremely well designed engine. 😎👍

[@speedkar99]

What about the transmissions? 😂

[@jasonpocaro2730]

@@speedkar99 Depends... The CVT are hot garbage. The 3 speed with overdrive tend to burn up the torque converter. The 4 speeds are ok, but people tend NOT to maintenance them till it's too late... 😱

[@mauricemotors8207]

@@speedkar99 Trans are trash but the engine it’s self is actually underrated I have a similar one in my frontier

[@NoName-gv6nm]

@Jason Pocaro I just change my 15 altima cvt fluid every 30k miles and haven't had any issues.

[@jasonpocaro2730]

@@NoName-gv6nm you are 1% er... Most wait till they 'slip' and then it's too late... Unfortunately. Good job on the maintenance. Money well spent. 😁👍

[@xxximors3178]

As a 3rd gen 02-06 qr25de owner, I actually like the engines performance but Nissan made a few flaws that needed addressing before modifications. Intake manifold valve screws, cat failure, sensor issues, oil consumption, weak gaskets(valve cover especially), but with patience and research it honestly has been a blast so far trying to build

[@bigred8022]

Hi mate I love your work and very informative videos and the sarcasm is gold thanks for your good work

[@charlesgould8436]

Thanks for doing these teardowns and for all the information!

[@allimkhan7540]

Fantastic Video i really enjoy watching this channel keep the videos coming!!!!!!!!!!

[@claycoates5056]

there is a reason for the Madness of Very tight Bolts and that is the stress of the rotating parts can be absorbed by the bolt Compression in to the Aluminum making for a more robust block your videos and very good Love the sophomoric view making this easy to understand please keep making these videos and why is KZbin removing the subscriptions form your channel this is there loss i keep looking for yours and other videos that are dropped thank you

[@azizfarash4684]

Fantastic! this is exactly the video I need to watch.

[@saeedhossain6099]

man you're a saint, there are too many Altima jokes/digs you let slide. I would not have been so generous, Altima, when you want to drive a Jeep badly but are waiting on that check to come through....

[@speedkar99]

Lol I really hit on Altima drivers on this one haha

[@mikegamba580]

Best video I've seen about this engine. I see a lot of pros and few cons pros timing chain over a belt. The external water pump is a pro. Aluminum head and block I see as a pro. But the valve cover being plastic and those sparkplug wells definitely all fill up with oil that is a con for sure. My cvt has 200,000 miles on it now but the original cvt transmission that was in the car blew as less then 10,000 miles and the car got a new one because it was still fully covered

[@ExcaliburTTP]

right? i wish nissan or NISMO made aftermarket aluminum valve covers for the performance people. people who genuinely work on their own stuff. with valve cover socket gaskets being easily replaceable would be a dream.

[@dundizzle93]

Great vid as always, love the altima/CVT salt lol

[@rturner4205]

Pretty much anybody has had an Altima driver story at this rate.

[@speedkar99]

It's funny but it's true

[@morrij01]

I had one of those in my 02 Sentra with the 6 speed manual and the engine got replaced under warranty after 80k kms with a failed head gasket and cylinder wall scoring from the disintegrating catalytic converter. The replacement one lasted another 240k kms after the car started to fall apart around it. It also had the aluminum intake plenum with the variable intake runners. The flaps inside the intake ended up coming loose and the screw got sucked in. No real damage though I put in the replacement kit and it was fine. Also, JWT used to sell a kit to remove the counter balance assembly. Thanks for the memories.

[@hokman1]

lol the car disintegrating around it. The mexican build is really bad... Elsewhere, Nissans are known for their quality.

[@GPN007a]

Hold the fuck on, they have manual transmission that mate with the QR25DE? 😭 Please help me out here 😭

[@tbskirk]

Yes they did and they were a little torque monsters for a Sentra with a six-speed manual

[@SuperGhost453]

Thank you for this I really appreciate your video

[@yaseralhetawi5838]

Thank you sir I lean many things because of your excellent explanations Thank you again

[@speedkar99]

You are welcome. Glad you learned something

[@Jody-kt9ev]

As to the counter balancing. Years ago, I had a Ford Ranger with a non-counter balanced 2.3L 4 cylinder engine. The truck was very noisy and after a while, you could not find good re-built carburetors for it. All of them had the various passages destroyed by engine vibration. Counter balancing is a good thing!

[@speedkar99]

It is but a lot of engines do without it

[@Jody-kt9ev]

@@speedkar99 I am glad the ones in my cars have it. I also have ridden in an early 1980s Ford Escort without balancing. Very noisy. We purchased a 1992 Ford Escort with a counter balanced Mazda engine. It was a world of difference from the earlier Escort.

[@adawg3032]

would love to see a vid on the v6 pentastar 3.6 liter. good videos i appreciate what you do

[@michaelbezoski3096]

I'm impressed. Didn't know Nissan gold plated the inner workings. Drunk guy crashed the car & liked the removal of the wires with the special wire removal tool 23-456. Love the humor, makes my day (night really). Thanks Bro!

[@speedkar99]

Glad you are entertained and learned a bit. Me too

[@willievandi7844]

My you tube teacher,your videos teaches and explains engine dynamics to the simplest of understanding,..may God give u more wisdom to produce more challenging videos

[@speedkar99]

Thanks and I'm glad you could learn from it

[@stevendowell2728]

Love these videos guy has a way of making it intersting

[@speedkar99]

I'm glad you appreciate them. Suggestions for improvement are always welcome

[@spelunkerd]

You've got excellent access to junkyard motors, great demos. I wonder why they didn't hang onto this motor to resell it....

[@toyfan2812]

i guess we've been very fortunate with our '12 altima. have 185k on it now (bought at 30k) and replaced the trans once. no leaks and only oil changes.

[@user-lh2xn5iy2p]

Dude this video was so great that even tho this isn't the version of the qr engine i was looking for, I watched the whole thing. Btw you cracked me up with all those "typical altima driver" behaviors 😂

[@wafflesnfalafel1]

my wife had one in her Altima - torquey little motor, though really preferred premium on the tune it came with. The only issue we had with it was a single bad injector at about 30k, no other issues.

[@HealthSupercharger]

How much Hp did the tune give you

[@stracera2523]

Man, I have been watching your channel for a while now. I hope to one day understand this much shit. Good lad.

[@saeedhossain6099]

brah I love how you yanked the fuel injection out with added twist but still followed the bolt pattern for the cam caps and head bolts!

[@sovan781]

its almost like muscle memory to follow the bolt pattern and its a good one to have since if you always turning bolts

[@speedkar99]

I've been dinged for not following the bolt pattern on here even though I'm gonna scrap this engine when I'm done with it

[@kubla777]

“In the one or two times the Nissan owner decides to change their oil” luv it

[@johnw3379]

I love your videos. You completely nailed the owners of these cars! So true lol

[@speedkar99]

It's true. I really farted on Altima owners in this one.

[@astralcomm7925]

you got me on the very hard to crack bolts hahaha

[@mathewfowler7771]

As an altima owner I can confirm I don't change my oil as often as I should, I do however constantly add to it.

[@Trades46]

This video possess some real BAE (Big Altima Energy) Jokes aside the QR25 is an okay motor and overall refined with time. I'm old enough to remember early 2000s QR25 which pre-cats self disintegrate, but most of post 2010s Nissan QR25 are pretty sturdy now, mostly hampered by their JATCO CVTs which all seem to be made from glass and their BAE owners.

[@michaelhodge9902]

You should do a teardown of that electronic throttle body to see how it works.

[@speedkar99]

I already have videos on how the intake system works , check it out

[@lutomson3496]

I replaced my 2021 rogue cvt oil at 30k sent it in to blackstone and came back great along with the engine oil it had no wear that was outside specs..i change my 2.5 and CVT more often then recommended

[@JulioOrtiz-ub3yo]

Lol you been take all you family stuff 🤣🤣 lovely thanks for the video

[@speedkar99]

Gotta use what I can find!

[@socmonki]

The QR in my wife's old 2003 Altima lasted about 250k before it lost compression and wouldn't start or run anymore. Engine swapped and at nearly 300k shes still going and driving me around since my Focus is in the body shop. 296k and the ORIGINAL transmission. Insane. She's a good car, had a lot of parts replaced. Very rattly, tin can like build, but I mean, it's getting me around still at her old age. Can't beat that. But Nissan made a LOT of mistakes, but the core of everything is pretty solid. Their sensors suck though.

[@TheMastadon1]

So many shots fired at Nissan Altima owners in this video. I love it lol.

[@FabriDragon]

I came for the Nissan zingers and was not disappointed.😊

[@speedkar99]

I really ripped on them with this one eh

[@95redchevy]

Thanks for your video. I have a 2010 Altima and it has been throwing blue smoke from the exhaust which means it’s burning oil. Any ideas of what it could be?

[@GPN007a]

My 2018 Rogue has one of these babies. Obviously it's not a sporty engine but it's pretty good. I wish there was some way to mate a manual to it while keeping my AWD.

[@TheXextreem]

Nice always want to use a nissan

[@speedkar99]

Yep

[@orlandonieves6597]

I’m wondering if these engines are all the exact fit. I want to swap one of these to my nissan sentra SER spec v 2002. Are all the qr25de exactly the same?

[@prestonworden9811]

Please do the little brother the QG18DE that would be awesome!

[@hamentaschen]

Shiver me timbers!

[@Mtechthewise]

I wonder if the sludge behind the timing tensioner is because that oil is sort of reaching a dead-end, with little circulation and consequently staying there when the rest of the oil is circulating and getting changed. The remainder of this engine didn't look too bad for wear, and no sludge anywhere, so what do you think?

[@speedkar99]

The bearings and cams had slight scores, and for a supposedly low mileage engine without a failure, that's not acceptable. Your sludge theory seems interesting

[@romevang]

18:16, This generation (or any of the prior) QR's never need valve adjustments. If the head ever needs to come off for some reason and you need it machined, you just check the valve lash to make sure its in spec, otherwise you never really mess with the cam buckets (or followers?)

[@pianoplayer2516]

Nice teardown. Did Nissan fix the head gasket problem?

[@lissettelopez8331]

Just took apart a newer version of the 2.5 of a 2018 Altima and I'd say it's much improved than the older version one here. A bunch of small changes, but important ones in my opinion, yet it's the same ole engine in the end just less problems, better mpg and more power. Oh, and they did keep the balancer assembly with the extra tensioner lol. I guess they thought it was worth keeping all these years.

[@Tiberiumfreek]

Nissan made A LOT of improvements over the years with their QRs. Though be it, some of it got WAY more complex. Alas, they seem to ahve made it just a little more robust. I own an 04 SpecV. First generation of the QR25DE with over 200,000km on it. Though, I do believe the previous owner had an engine rebuild, covered under Nissan. Primarily due to their terrible precat breaking up issues. Fantastic engine_ but not right from factory floor. In order for it to surpass the original plan of total breaking down at: 100,000km, you have to get rid of quite a few things to make it solid. Biggest issue, being the precat. The list is extensive, but once you get things done_ she'll keep on ticking!

[@MrPelletty]

Can you clean the camshaft and lifter buckets without removing the engine and messing with the timing chain? Im trying the clean an engine that is still assembled in a car.

[@user-lh2xn5iy2p]

The sound of the bolts 13:20 😂

[@sean8470]

what car manufactures to you recommend and ones to avoid?

[@XenomorphLV426]

The 07-12 QR in the Sentra Spec V was best variant from a performance and durability point of view.

[@speedkar99]

Yep. That was a zippy unit

[@WealthWise911]

in the mexican datasheet of the Spec V the engine appears like TR25 and not QR25.

[@HealthSupercharger]

I have a manual 5 speed transmission with this QR25 engine on my 2011 frontier. I have 215 000 km or 135k miles. Do you still think that my transmission will fail first before the engine if i am hauling 1000 to 1400 lbs of tools and passengers? Engine does not burn any oil or leak any oil, i religiously change the oil every 6500 km or 7k km. I change transmission gear oil every 70 000 km or 3.5 years.

[@yassinelhadj-said458]

My man, 👌

[@speedkar99]

Thanks

[@MeanBlueSpider]

Still love your video editing style. What year would you say Nissan build quality started really dropping off, or has it always been kinda shoddy?

[@regperatrovich9406]

I agree. His video editing is top notch.

[@speedkar99]

Thanks I'm glad you like the editing. Usually takes me 2 hours to edit this in Sony Vegas.

[@speedkar99]

They say Nissan turned a coin around the 2002 Altima and that's also when the quality turned bad as well

[@JamesLee-oe7mt]

Those head bolts would be great for the torque test channel!

[@nightinthewhite3817]

@@speedkar99 when renault started giving nissan advice on how to save money, which is 2002! its a wild ride with an unbelievable ending

[@danielmalungu4763]

Nice Video, could you teardown toyota 1NZ-FE

[@speedkar99]

I have a 1NZ video, check out the Toyota with 500,000km video

[@danielmalungu4763]

@@speedkar99 Thank you I have an 1NZ engine any advice on thinks to watch out for

[@thetechlibrarian]

If this is the engine from the newer altimas I was actually surprised that makes its torque at a relatively low 3600 RPM for a naturally aspirated motor

[@MrIMCP]

I must be like 1 of 20 Altima owners that take care of their car. I'm clocking 180k on my 2014 Altima and all systems are good! Drain and fill that CVT!!!!!

[@asiyajawad7871]

Is it possible to ask you some questions about Kia engine failure? Pistons particularly? I would reeeeallllly appreciate it!

[@ken97531]

the owner or owners definitely had big Altima energy

[@speedkar99]

Yep!!

[@PLATINUM2U]

No wonder why my baby's got almost 500k on her. She never complained 😎👍 3rd generation was best imo

[@greathey1234]

YES! A GREEN TOOTH BRUSH!!

[@speedkar99]

Yes sir

[@a.fortier208]

you're the engine coroner! the engine autopsy channel! you do many engines but only a few transmissions, are the transmissions too messy?

[@JulioOrtiz-ub3yo]

Lovely

[@speedkar99]

Thanks

[@MitchellPetersonJr]

You're 110% right about Altima owners.

[@speedkar99]

Haha

[@pg41226]

Would it be possible to get your hands on a newer type of Volvo petrol engine? I am a huge Volvo fan and liked your 5 cilinder engine tear down a lot!❤

[@speedkar99]

I'm glad you liked the Volvo teardown. I have yet to see broken one for sale ☹️

[@edwinalexander1170]

Is it the same engine installed in Xtrail T30 and T31.?

[@ibraheemmshezad400]

Plz make a video defender 130 efi

[@Erik_Swiger]

So the variable valve timing is sort of an on/off thing? The solenoid engages, and the oil flow shifts the valve timing X degrees? For some reason, I thought the "variable" meant continuously variable.

[@dgurevich1]

I think on the intake, there are at least 3 positions because 2 actuators

[@fritsified5952]

It is continuously variable. The ECU varies the pressure of the oil by switching the solenoids on and off many times per second (called PWM or pulse-width modulation). So it is not just fully ON or fully OFF, it can be anything in between. The ECU knows the position of the cam as there is an angle sensor on the camshaft, so the ECU can control the angle (making it a closed-loop system)

[@speedkar99]

Well said. OEM control

[@olafzijnbuis]

at 16:41 you say "the timing chain uses a one to one ratio...". I feel it would work better with a 1 to 2 ratio 🙂

[@speedkar99]

Yes You are right

[@Erik_Swiger]

Engineer's Dream: "I will build amazing engines!" Engineer's Reality: "Hey, Larry, design a new bolt head that nobody else owns"

[@speedkar99]

Often it's not the engineers that make those crazy descions. It's the bean counters.

[@useribp]

Does the new generation qr25de engines need valvle clearance or thy have hydraulic lifters ?

[@speedkar99]

They should be similar to this.

[@vivi_75]

Will you ever do a Transmission Teardown, particularly the CVTs?

[@speedkar99]

I've already done a CVT video, check it out! I've got another one coming later this season

[@christopherhernandez78]

Thanks for another nissan video.. although your roasting goes far. Like people say Nissan will sell anyone an altima with bad credit.. can't afford maintenance nothing and irresponsible at best. I was diffrent. But the majority is trash.

[@rondhole]

Early 2002 QR25DE is prone to head gasket failure, and complete cylinder wall failure from ingested catalytic converter materials. It has a good torque at low rpm.

[@moreyour5]

Agree, but still it toughest then second gen

[@rondhole]

@@moreyour5 2nd gen 2007-2012 has better engine, compression, and notorious engine mounts. The CVT on those period is a kind of OK, the 2013-up are the one with CVT Jatco plague. Toyota and Honda has no issue on their CVT and works fine till today. Nissan, Subaru, etc. with JATCO transmission are just bad, too many design flaws.

[@speedkar99]

Yes but what if you find one with a rare manual transmission? Then you've got a decent runner

[@vaughngraves6723]

@@speedkar99 I have a 2003 Sentra SE-R Spec-v that I use for work, great little car once the butterfly valve screws were loctited and I swapped in a catless header. Without those preventative steps it's really just a matter of time before the engine is toast

[@mauricemotors8207]

The current ones is the best version especially in the frontier

[@tinleo333]

How good is this engine compared to the toyota 2.5 in the camry?

[@colchronic]

I laughed so much at the lack of oil change joke 😂

[@greebj]

Which one out of the 42 in the video lol

[@speedkar99]

Haha that just came naturally

[@colchronic]

@@speedkar99 well you aren't lying 🤣

[@colchronic]

@@greebj yes

[@robertbandusky9565]

Please do an old 1970 Volvo b-20 engine!

[@speedkar99]

Where do I find that?

[@sovan781]

oh no broke the tooth brush, the style of the cradle and the balance shaft even the chain guide looks almost like the kseries engine from honda not saying who copy who but its deff a solid design for longevity and strength

[@speedkar99]

K-series and QR came out around the same time. The Honda is just way more reliable and can take more abuse.

[@mikezerker6925]

The toothbrush and wardrobe budget on this channel must be insane!

[@speedkar99]

No budget. Just walk into the laundry room or bathroom and take what's there.

[@faustoborja1079]

Should i buy a Hilux with 2.7 2TRFE engine or a Nissan Frontier with 2.5 QR25DE engine?

[@kclefthanded427]

My parents 2013 Nissan Altima CVT failed at 100 miles past the warranty. Should've got an Aisin

[@speedkar99]

Ouch!

[@stevemino142]

The reason why the 2.5 litre nissan is so great is because it's simple reliable and unbreakable kind of like how GM cars used to be... have 2020 altima with the 2.5 and awd and getting 43 mpg highway and hasn't missed a beat in 42000km

[@speedkar99]

The engine is good. Can't say the same for the rest of the cars

[@NoName-gv6nm]

@speedkar99 I have a 15 altima. While I wouldn't buy one again, it's honestly not that bad. Sort of middle of the road in the industry. 106k miles and I've only had to replace a drive belt. I've had some nightmare cars in my life. So I can't complain.

[@imnotusingmyrealname4566]

So happy Toyota made the tumble flow flaps obsolete.

[@speedkar99]

Don't they still use them in the new A25A and M20 motors?

[@bigred8022]

Dose the X-Trail T30 2004 have the same transmission or different coz of 4wd

[@dcdc358]

The T30 has a "regular" automatic with a torque converter. The "dreaded" CVT came with the T31 . Nothing to do with 4wd .

[@TurboChanler]

oil pan first, then the timing cover.

[@WereAllKings]

What year is this engine?

[@chih6654]

These engines are actually quite nice, just the CVT that sucks

[@1uch1n11]

how often do *you* do valve adjustments? Next one you do maybe make a video

[@speedkar99]

Good idea.

[@1uch1n11]

@@speedkar99 I'm actually curious because you dont hear about people adjusting their valves too much anymore (not like back then) nor do you hear about people taking in their car to get a valve adjustment service. I'm wondering if new cars ever actually need one unless the engine is screwing up somehow. It's obviously a lot of work to do it or pay someone to do it.

[@NoName-gv6nm]

​@1uch1n11 it is most likely a service you won't ever have to do if you're changing oil regularly.

[@95TurboSol]

I like how the whole video is just roasting altima owners 😂

[@speedkar99]

Pretty much!!

[@inspectorjavert5563]

Do the Mitsubishi MIVEC 2.4 engine if you can.

[@armando5601]

Is this the same engine in the 2016 2.5 frontier?

[@speedkar99]

Yeah it should be

[@azariayehezkel9064]

we need more videos

[@speedkar99]

I'm working on them!

[@toninocars]

The engine was neglected with not regular oil changes or bad quality oil been used. Once you see the metal discolouration inside, that’s it no need to guess more.

[@speedkar99]

Yeah its seen some abuse. I dunno what makes people not take care of their cars....

[@mishasweet4780]

Speedkar99: look at these clogged up oil control rings! Me: *laughs in spinning dorito*

[@speedkar99]

Doritos?

[@xschan]

nissan use this engine to power the NP300 (frontier) largely sold in mexico and prove to be robust in bad conditions (bad roads, poor maintenance and high load)

[@Atraps003]

I have a 05 QR25 with 350k miles. No issues except valve cover leaking oil down the spark plug tubes causing misfire. Original trans still works but doesn't like shifting when cold.

[@speedkar99]

Awesome! Hopefully it's not attached to a CVT

[@adityadogiparthi]

Hey there What's the best engine so far you've seen in your whole career

[@speedkar99]

That's hard lol 😂 The Toyota 4 bangers 1NZ/1ZZ and K24 seem well built

[@cutabove9046]

Cars are so expensive these days and oil changes are so cheap I simply don't understand the lack of maintenance by so many owners.