SYMPTOMS OF WORN ENGINE MAIN BEARINGS

In this topic I discuss the symptoms of worn engine main bearings. I also explain what cause main bearings to go bad and fail and how it can be prevented. If you're hearing noise from the bottom end of the engine it could be a sign the crankshaft bearings are on its way out. A failed bearing can cause engine to seize.
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[@joeaboko807]

This video needs more like because teaching knowledge is not free

[@martinfarfsing5995]

I grew up hearing grease monkey was bad job to have , I am now learning all I can about engines , motors and vehicles . Your video was perfect , I listened to your every word and pictures ,thanks , and good fortune to you .

[@littlerayofsunshine69]

Beware the leaches. Once they find out you can work on cars, they'll be coming out of the woodwork looking for free labor.

[@velox731]

Valuable information! Key point: Change your oil on time.

[@johnxmackenzie]

Legend! I pray i can replace the crank and bearings rather than replacing the whole engine. 2015 Golf R! 😢

[@NightWolve75]

You were the only mechanic that helped me diagnose my Toyota engine's vibration problem when coming to a stop! Needed total main/piston rod bearing replacement!! Thanks so much! ❤

[@cy-villian]

Thanks for that. Very clear explanation. Appreciated.

[@davekhai2723]

Thank you for sharing valuable knowledge

[@badboysuliman2546]

good teacher 😊

[@user-jn8ej4kf3l]

we are 20 years professional engine parts OEM manufacturer.Our quality is high and stable.

[@damiropadobarglumskiperiod505]

Awesome explanation.thank so much

[@damiropadobarglumskiperiod505]

I have certain sound that goes away when engine is idle .and increases with high arp specialy in low gear and uphil.can it be the the bearings

[@brianvickery6202]

Another great video thanks for sharing.

[@juharuotsalainen6938]

When is crankshaft polishing appropriate? is it every time you replace the bearings or only when you can see and feel scratches on your nails and fingers or no shine at all? isn't the smoothness and relatively smoothness the most important thing?

[@vincentolsen1668]

Daer SIR I am from suif African 🇿🇦 I ryfe a Geely LC 1.3 tween came.i need to thank you for your video.quisten what' happen if oil WHAS lowe (oil lit came on) and then

[@tonyjosephs1396]

great video thanks

[@isaacgarza1069]

Metal shavings could be rod bearings also

[@madkoolieindi]

I have a a issue with corolla 2zrfe engine when I start in the morning in Canada it’s start with a sound like belt are pulley I change the belt but still have the sound but as soon as it warm up it’s ok

[@Youngwolf3459]

Wow you are amazing my friend. This video is very informative. Thank you so much for explaining.

[@freddyalfarodavilla2463]

amazing video

[@pietjan2650]

Ive rebuild 1980s dirt bike engines and wear on transmission shafts from bearing was severe therefore i dont buy high milage cars. Engine wear down

[@jacquelinechellis4036]

Many different motors. Usually if the main bearings are worn out so are.the rods. When the mains wear out often times the rod will.starve for oil. The one thing that usually holds up is the main bearings.

[@carlodonnell146]

If 20w 50 is being used with old bearings....and then the bearings are replaced should I go back with 10w 40 or 30 with the new bearings? Would 20w50 cause a circulation problem if an engine has new bearings?

[@bobzak9508]

When u say low oil pressure, will that be always or just at idle? I have low oil pressure at idle but if I keep a rev at 1k on the tach, it goes away. But no oil light above 1k just at idle.

[@kamranmarwat3776]

Hy ,i have low oil light on idle only when the engine becomes hot after sometimes it goes off , is this main bearing problem?

[@harrisonclark4382]

Could using too thin of oil in a built Coyote engine cause smoke to come through the ac vent?

[@81mrlz]

Hello my engine when it warms up and about 30 min the engine starts to lose oil pressure slowly after about 60 minutes I have to turn off the engine because then the oil pressure becomes critically low, but when the engine cools down I get the oil pressure back or when I accelerate in neutral gear the oil pressure comes back at high rpm, I wonder if it could be the oil pump or motors worn in the cam bearings? to give more info the engine is not leaking oil and the pressure on the cylinders is quite good, the engine temperature is also good

[@chriscarey1291]

I have a 1974 carb-converted Porsche 914-4 that came to me with grossly contaminated engine oil; the drained oil looked had a white 'mocha' coffee appearance when I removed it...evidence to me that some unknowing person had perhaps pressure-washed the engine bay and the dual Weber carbs entrained water into the oil sump. The engine has a low sort of variable 'rumbling/grinding' sound that suggests to me that it may have sustained main engine bearing damage from being run with that contaminated oil. Does this sound like a reasonable hypothesis? Is it possible to accurately confirm or rule-out main bearing damage other than a tear-down for direct inspection, if there doesn't appear to be any metal shavings in the oil and the oil pressure seems to be within normal limits? A 914 engine main bearing replacement procedure would be EXPEN$IVE, needless to say... Thanks. Excellent instructional video, by the way!

[@mitchjones8694]

If the main bearings go out and the engine stops can you still repair it??

[@sivucit]

just subsribed. how do i tell if knok is because of rod or main bearing ?..

[@phillipforbes1173]

If diesel fuel is going down into the oil pan, caused by fuel injector problems, how long does it take before you can lose the engine ?

[@joshreynolds729]

Good video man. So what is advised to use to check clearance of the bearings, plastiguage reassembled and torque to spec then recheck? Or is there a more precise way? How to find the tolerances for a vehicle or tq specs to do this process? And on say performance engines do these tolerances need to be changed if say you add about 400 whp more than it already has over stock? Sorry for the many questions but seems like you know what your talking about.

[@Top5AutoRepairs]

For procedure and spec I use All Data.

[@joshreynolds729]

@@Top5AutoRepairs Thank you. Would you know if they have 2016 dodge hellcat specs. And is that like a monthly subscription. Your probably a mechanic so you probably have it at work.

[@user-wm3fc1sk1p]

My dad thinks he can drive with bad main bearings forever😡 He won't let me take the engine out of the car for a full rebuild😡 I took the oil pan off and the connecting rod bearings just have minor stuff from recirculating shavings from the mains but they are definitely not the source of the knock.

[@christinad3425]

Can I access main bearings from under the car? i have a Mazda CX5

[@blazem2400]

It would be hard because it’s upside down

[@jasontrammell4674]

Hey none of these symptoms just hear a whining and car dies? Opinions

[@kellyjohna]

I'm rebuilding motorcycle engine. The crank bearings have colors but bottom crank bearings are black and top are blue ? Shouldn't the colors match on bottom and top crank bearings ?

[@mr.hernandezdrives]

great video sir, scary topic do you believe an oil test can help tou judge the health of my engine, what results am i looking for?

[@johndelong5574]

Examine oil and filter paper for tiny shiny or grayish particles. Use a magnet to find steel

[@Top5AutoRepairs]

Yes oil pressure test

[@ishwariametoo7336]

Hi why or what cause my crankshaft to bind when i thighten the connecting rid on the journal. It werent spin by hand or even using a rachet

[@zakiramjan9822]

Bearings clearances are too tight

[@Rawrkee]

Thanks for this video! What grit sand paper do you recommend using on the crankshaft journals?

[@Top5AutoRepairs]

600-1,000. Super fine or ultra fine.

[@jeremyjones8872]

​@@Top5AutoRepairsThank you for your videos,.question,ive been trying to figure out my oil pressure issue on 07silverado,3mechanics later and over $1k i didnt know until watchn you.but can my bearings be issue if NO NOISE but round shavings in pan and no oil pressure after 5mins running?? Any info greatly appreciated

[@tirnistirnis9009]

Hey, i wanted to ask. I got aluminium in my oil filter only. I went to change rod bearings and found that they look like brand new. There also was no metal in oil or pan, only in oil filter. Is it likely my oil pump is giving up? It looks scored. I didnt check main bearings tho, but when rod bearings looks good, mains should be good too as rod gets oil from main, right?

[@icecolddrone267]

Could be a actuator that broke.

[@mokhtarbachir3601]

Hello, nobody talks about the main and rod bolts ? Reusable or not ?

[@Top5AutoRepairs]

Reusable as long the engine did not overheat