t-belt/ timing

[san supra]

i have a 91 7mgte and i just changed the t-belt. (i have done this 3 other times with no probs)

everything is together but i cant get the cps to drop in so the bolt will go through.

i have dropped it in almost 20 times and have been going between two teeth but i need something in between the teeth so i can put the bolt in.

MY QUESTION
What would happen if my exhaust cam was off one tooth on the t-belt?

I did line everything up but you never know


when i turn the cps to 10 btdc my car starts and runs great! but just enough off to block the bolt hole.


http://www.supramania.com/forums/showthread.php?117471-timing

 

[Suprapowaz!(2)]

Does the valvetrain sound any better,or is it still noisy?

 

[san supra]

real quiet now but i didnt think it was that bad before

 

[san supra]

HELP! both my vehicles are down and i go to school on the other side of town.

no one has slipped a t-belt?

if it is a tooth off would it even start???

 

[hvyman]

put the crank to tdc and check to make sure the cams are in the right position. use a chop stick and make sure its at tdc.

 

[san supra]

While putting this together i had the crank at 0tdc and both cam gears lined up with the marks on the cam gear case.
I stuck a short skinny screw driver handle in the cylinder and it was up.

The only thing that didnt go right is when i put in the cps in and i had the rotor facing the top poll as i always do and it was 180deg off.

I flipped it 180deg around and it started fine but i still cant get it to line up with the bolt hole.

to get all the timing marks aligned again i have take the t-belt off right? On my 22re after you rotate it, the timing marks almost never line up again.

so what do you think about starting 180deg out? wrong stoke? i thought the cams controlled stroke

 

[radiod]

You'll want to avoid using stuff like screwdrivers and whatnot when checking TDC in the future because it will scratch up your piston. Thus the chopstick. Soft wood that won't hurt anything, straight, and long.

Cams don't control the stroke at all. Cams control the valves, opening and closing let in air/fuel, letting out exhaust. The crank controls the stroke. IF by chance you were off by 180*, you'd be VERY lucky we have non interference engines, otherwise you would have just bent a good number of your valves.

Checklist for timing:

Mechanical timing....

Crank @ TDC; 0* on the lower timing cover
Cam pulleys aligned with matchmark

Ref: http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=29

Electronic timing...

With your crank @ TDC; 0* on the lower timing cover, pull your CPS
Match up the drill point to the match mark on the housing
Install the CPS straight with the mounting bolt roughly in the middle of the slider, it may take some wiggling to the CPS gear to mesh with cam
Bolt up the CPS snug, but not tight
Start the engine, get your timing light out and rotate the CPS to adjust your ignition timing as needed by aiming the light at the lower timing cover and looking for the mark on the pulley to hit 10* BTDC

Ref: http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=24

Assuming you do those two things correctly, you shouldn't have timing problems with the engine. Any starting problems after the timing is set properly are going to likely be fuel, ignition, or vaccuum issues.

 

[san supra]

thanks for the info.

just so you know i used the handle side of the screw driver. thanks again