1uz Scissor Gears. Operation and timing of the internal camshaft gears on a 1uzfe non-vvti

The Cartune Company (2003) Ltd in New Zealand does 1uz and 3uz conversions / parts and wiring. We have been working on UZ Toyota V8 engines since 2004 when we did our own Hiace van to transport dirtbikes around NZ. Since then we have swapped to doing mainly just Lexus V8 work from a family owned farm hidden away in our paradise , surrounded by the NZ native bush. We sell parts and simple to follow wiring instructions for the 1uzfe engines. For enquiries email [e-mail] Take Care. Kelvin

[@hamishewart5984]

You saved my ass…. I totally missed the Scissor gear and all is perfect now. Please keep posting, you are saving many asses!

[@NameItBuildIt]

I have finally figured after 2 years of ownership that they may have not put service belt in when doing timing belt. Can you fix this after they didn’t put bolt it and it has been making diesel sound for a while? Thank you so much Kelvin your knowledge and videos are best in the world hands down!

[@damienbevan9732]

This guy is very spot on precise 👍

[@CartuneNZ]

Glad you think so! Cheers Kelvin

[@Kelford-Cams]

Awesome content, loved watching your video. Great information

[@CartuneNZ]

Thanks for the compliment. I have a job due this year which may require some parts from you guys this year. Its a supercharged vvti 1uz altezza which needs more power. Hopefully you can help with that one. Cheers Kelvin

[@Kelford-Cams]

@@CartuneNZ Hi Kelvin, I'm sure the guys would be keen to help. We are developing a new website featuring customer builds so make sure to send through your finished project, would be keen to see more

[@estevatopanchovillacruz9969]

Your videos are so full of great information on the 1uz. Can you do a video on removing the engine from the car? I just bought my son a 1992 SC400 with 58,000 miles on it and I plan on refreshing the engine. I would prefer to remove the engine from the car but I've never done it before.

[@CartuneNZ]

I already have one in the ls400 refab series. Pretty much the same thing as the sc400 to remove the engine

[@estevatopanchovillacruz9969]

@@CartuneNZ Thank you!

[@marknixon8000]

Can you plz do a video on checking valve shim clearance tolerances

[@CartuneNZ]

Theres already one edited with some clearance checking but I have to refilm the steel head gasket section as I had it in time lapse.

[@River1Nile]

Thank you for all the information. Is the first generation of the 1UZ FE an interference or non-interference engine?

[@marcdargitz2949]

Non interference

[@River1Nile]

@@marcdargitz2949 I thank you for the info.

[@River1Nile]

@@marcdargitz2949 Thanks for your reply.

[@aliriolopez8999]

Saludos desde Maracaibo Venezuela, sobre la sincronizacion, mi problema en ls400 1.992 es ; al encender el auto no pistonea o taquetea pero al calentar si lo hace. influira la sincronizacion de estos ejes? PORQUE? solo al calentar? gracias de antemano.

[@joshepanthonyenriquefelipe1191]

hello friend, good morning, joshep greets you from peru, I tell you that the 1uz fe in peru is not very commercial, however I got one but I have a problem the timing belt temperer does not tighten the pulley I remove the trigger but it stays loose the belt, I would like to know if the 1uz and 2uz hydraulic tempers vary because we import the temper and the water pump and oil pump as well and the 209-tooth belt but I have this problem, please I need your help with this problem since you are an expert in the 1uz faith

[@user-mt1ne3kg7j]

I also be told to put a bigger cams and the clicking will go away what do you think

[@CartuneNZ]

Sounds like a strange solution to me. If the clicking is tappet clearance then adjustment of the tappets is a good start. Cheers Kelvin

[@nct9466]

Double dot is on valve rock number 1 at TDC then? Dot is TDC compression stroke on number 1

[@CartuneNZ]

Correct.

[@gang6009]

Ya grinding me geahs

[@CartuneNZ]

it happens. Cheers

[@stevekirby9797]

Hi, I have 1 UZ F E non-VVTI in a Triumph Rocket 3 motorcycle I'm building, and really want to dewire it as much as poss. I know I must keep fuel injection, crank angle sensor and obvious fluid activity wires, but can you please advise me on the possible minimalist computer to run it? I'll be running a stock airflow metre of course, but just need a bit of guidance. I have grafted a 1985 Suzuki Swift non-computer-controlled 3 spd auto on to it. There were other engineering obstacles I faced, but so far all is looking good. And yes, photos are available. Thanx Kelvin.

[@CartuneNZ]

Hello Steve. Maybe look at some of my link videos. A little monsoon might be the answer.

[@user-mt1ne3kg7j]

Hello I bought an ls400 and the only problem is when I’m accelerating there’s a small clicking sounds what could it be

[@CartuneNZ]

Could be lots of different causes. I recommend diagnosing the issue properly. Cheers Kelvin

[@sivageist]

Hey Kelvin, I know it's an older video, but I am getting ready to do those nasty O-rings on the VVTi uz. I have done the timing and camseals on an early LS400 but never a VVTi. The question I have is when do I install the service bolt to lock the scissor gears? I read that the service bolt holes don't line up when they are at TDC not sure if that's true or not. But is it safe to leave the old belt on rotate until the scissor gears service bolt hole is easy to access then rotate the engine back to TDC and do the actual job. Then when done installing all the new gaskets and timing belt rotate back around and remove service bolt. Let me know if I understand that correctly. Also I have read that it's better to do 50 degrees ATDC rather than TDC. Is that necessary or safer? Cheers for the wealth of knowledge once again Kelvin.

[@CartuneNZ]

totally fine to fit service bolt and rotate the engine, just dont forget to remove it when done

[@Warpedsmac]

Typical colour difference between left and right cylinder bank...run temperatures and oil flow gives different colour...I don't think I've ever seen a 1UZ-FE with the same colour left and right. Double marks are used in initial assembly where the alignment is checked quickly by rotating the engine two rotations...after that nothing will line up again.

[@CartuneNZ]

Colour difference is related to the PCV system. The cambelt marks wont line up for many many revolutions but the dots on the camshafts align every revolution. Cheers Kelvin

[@marcdargitz2949]

Anybody know, if the series 2(95-97) interference engine's can be rotated counter clockwise by hand. I'm referencing a completely stock assembled engine with timing belt installed?

[@marcdargitz2949]

Continuation to the CCW rotation question... will this cause damage? I'm referring to turning the crankshaft by hand with fuel disabled. I've had Megasquirt support tell me, that it's safe, because the instruction procedures require CCW rotation in order to locate the #1 trigger angle. This is required prior to establishing a base map.

[@CartuneNZ]

While its not ideal to turn CCW it's highly unlikely to cause any issues. This is more a case of good practice in most cases.

[@marcdargitz2949]

Much thanks!

[@bvward]

Very informative. Was the engine Jason was fixing your bent valve one?

[@CartuneNZ]

This is an engine we pulled dowm earlier this year that had oil supply issues. Lots of parts have been powder coated and vapour blasted now its assembly time. I have a video coming of the job once I fix a small editing issue. Cheers Kelvin

[@fmn716]

Another great vid any advice on how to remove cams

[@CartuneNZ]

Yep, Lock scissor gears , ensure you know where the cam timing is, undo the bolts evenly. Cheers

[@fmn716]

@@CartuneNZ do you suggest start loosening the bolts from the center or start from the ends

[@CartuneNZ]

I work slowly through them undoing each a little bit at a time. Where you start doesn't matter provided its a few turns at a time

[@givenkhomotso4544]

Hi Steve ,m given . Can an UZ 1 engine bent valves after a timing belt was broken into pieces?

[@CartuneNZ]

Absolutely they can if the cambelt job is not done correctly. From generation 2 engines on

[@machedari]

Hi Kelvin Ive got a random question. On my 98 LS400 I've replaced my valve cover gaskets and added silicone to the corners, Ive replaced my cam seals and crank seal but theres a slight engine oil leak onto my alternator. Its not my power steering so What else could it be?

[@CartuneNZ]

Sometimes cam seals leak down the side but I would be double checking the PS pump (or lines) and the tappet cover gaskets. Clean it off , drive and look for the wet patch. Cheers Kelvin

[@machedari]

@@CartuneNZ It seems to be engine oil and not PS fluid. I'll recheck everything and if the gaskets & seals check out I'll replace the VVTI cam gears as Ive heard those can leak. Would you recommend an O ring replacement for the cam gears or replace the entire thing?

[@drz00241kid]

Hey im prepping a 1uz for a 240sx but it has a burnt exhaust valve so I’m thinking of porting and polishing the heads while they are off, do you think it’s worth it considering I only want to make 400hp max boosted? It would be my first time porting heads so I’m a little nervous thanks

[@CartuneNZ]

Absolutely worth it. So much easier to make good power.

[@drz00241kid]

@@CartuneNZ thanks,all the way from New York if I could tip in bananas I would.lol

[@mrvzys1358]

Say if one was to put it back together but doesnt install the cams at tdc what would happen when u go to turn her onv

[@CartuneNZ]

Likely scenario us Gen 1 wouldn't start, gen 2 also wouldn't start with the added bonus of pushing the valves into the pistons and damaging the engine.

[@mrvzys1358]

@@CartuneNZ so wouldnt start at all or would start then stall?

[@CartuneNZ]

@@mrvzys1358 depends on how far out it is. Do you have a start and stop a few seconds later?

[@mrvzys1358]

@@CartuneNZ i have a start then cut off issue, give it some throttle shell stay idling for a bit let go to quickly of throttle and shell cut off sometimes when revd to high shell cut off , i have tried it all , cam position sensors , temp sensor, new plugs wires , cap rotor , crank position, new injector , tps

[@CartuneNZ]

Instead of just throwing parts at it I would be testing it. Here is one suggestion. kzbin.info/www/bejne/i3PEo6Cpecl8brs