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Another timing belt question

 
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  #1 (permalink)  
Old 25 May 2012, 09:51 am
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Default Another timing belt question

Sorry to ask again, I know there are many thread on this and I have read them all.

After doing a head job and trying to install timing belt, I cant seem to get the timing right. I've tried to get all four cam marks to line up with straight edge and it does not seem possible.

There was a picture on a thread here that shows only the two closest marks lining up with both cams angled slightly up. Tried this also. I've had the car start but stall in a few seconds. Highest compression I have gotten is around 90.

Is there a right way to line these things up?

Any help or advice would be greatly appriciated! Thanks!
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Old 25 May 2012, 01:34 pm
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Default Re: Another timing belt question

Follow the manual best you can-

Use straight edge thru:
center of bolts
and thru inner marks.
This is a 2.0 (cam gears just flipped over), but you get the idea:


It's VERY difficult to get a line of sight on these three marks while in the PT chassis- So we feel your pain.

The drill holes in cam MUST be straight up (or straight down ...)

(Picture Courtesy Jeff Ball)

Ensure cam bolts are properly torqued, and that the pin isn't sheared
Rotate engine only clockwise
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Old 26 May 2012, 09:26 am
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Default Re: Another timing belt question

Thanks for the advice. I can't work on this for a few days due camping trip.

But a few points:

Cam bolts are torque proper ( even went out and got the right torque wrench for this)

Pins are not sheared

Allways turning clockwise

Not sure of drill holes (valve cover is on), but pins/cam sprockets arrows up should ensure this?

Should the outer marks line up with inners using straight edge?

Thanks again for the help, I wont have net access until we get back from camping trip. Will check back then!
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Old 26 May 2012, 05:53 pm
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Default Re: Another timing belt question

Quote:
Originally Posted by mekkanic View Post
Cam bolts are torque proper ( even went out and got the right torque wrench for this)

Pins are not sheared

Allways turning clockwise

Not sure of drill holes (valve cover is on), but pins/cam sprockets arrows up should ensure this?

Should the outer marks line up with inners using straight edge?
Yes! follow the 'cast-in' sprocket instructions!

The Factory Service Manual (FSM) makes no reference to the outer marks- Ignore them.
Did you read the FSM procedure- Line up all marks, advance exhaust 1/2 notch?
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Old 27 May 2012, 05:22 pm
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Default Re: Another timing belt question

Remember do not reverse rotation when aligning....keep going in one direction until aligned. And once you get it aligned, rotate 2x just to make sure....It will take awhile, but I can be done.
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Old 19 Jun 2012, 02:42 pm
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Default Re: Another timing belt question

Finally had the time to mess with this again. This is the closest I have been able to get the marks, but compression is still low and when the cams are lined up, the crank is off a little. I'm guessing I need to keep trying?

The pic of the cams is taken at angle, but the marks line up pretty well with the bolt centers. I have put this belt on like 20-30 times already
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Old 19 Jun 2012, 03:00 pm
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Default Re: Another timing belt question

Sorry but I don't get why nobody uses the old tecnique of marking the old belt and pulleys with a magic marker , then transfer the marks to the new belt before installing it on the car ...so you just follow the marks
I used that on every car I did the timing belt and NEVER had an issue with timing

Timing Belt Change Hints and Tricks (Picture Warning!)!)
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Old 19 Jun 2012, 06:10 pm
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Default Re: Another timing belt question

Mek,

Your crank is advanced- Follow tooth to oil pump housing mark.

IF the straight-edge is tight against bolts, it's NOT over bolt center.

Your intake is way retarded, exh is close

(Don't pay attention to the '2.0' marks)




Don't fret, though- These are really easy to mess up because the poor line of sight chassis allows you
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Old 19 Jun 2012, 07:20 pm
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Default Re: Another timing belt question

Thanks much Uptown. I will give it another go.

Not sure what you mean by this though: 'IF the straight-edge is tight against bolts, it's NOT over bolt center.'
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Old 19 Jun 2012, 07:41 pm
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Default Re: Another timing belt question

I can't tell if ruler is against bolts or held a little away-
Optical illusion perhaps
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