Timing belt 1/2 notch off
07-20-2002, 05:16 PM
#1
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Timing belt 1/2 notch off
Hello, I'm changing my timing belt on my 90 GT. When I put the new timing belt on the right bank (4-8) does not align right. On TDC the left bank (1-4) is ok and the right banks seems to be off by about 4 degrees. It is not one notch of, because if I advance it it gets way off.
You could say It's about less then a half tooth off. Any suggestions?
Regards
/Rehan
You could say It's about less then a half tooth off. Any suggestions?
Regards
/Rehan
07-22-2002, 01:46 PM
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This is normal......remember the belt is about 7 feet long. I always make sure I set the first cam up exactly, then get the other as close as possible. I beleive mine was 1/2 tooth retarded (same as when I started). I have heard others say it should be advanced. You should always note exactly how it looked when it came apart.
07-23-2002, 09:07 AM
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On the 32-valve engines, the cam sprockets can be adjusted on the camshaft - or perhaps we should say that the camshafts can be adjusted on the cam sprockets. This allows you to get the cam timing perfect, even though the sprockets may not be perfectly aligned.
There is a four-page procedure in the Woekshop Manual. Basically, you set the crank to 20 deg ATDC and see if the #1 intake and the #6 intake valves are lifted a specific amount, which varies by model. If not, you turn the crank until the correct valve is lifted the specified amount, loosen the cam sprocket and lock the sprocket hub and cam in place, then turn the crank/belt/sprocket until the crank is on 20 deg ATC. Tighten the sprocket back to the hub, remove the locking bolts, and do the other side.
Bottom line - the sprockets may not be exactly on the timing marks, but if the cams are properly timed, it doesn't matter. You can either hope/assume that the cams are timed correctly, or you can get the manuals and a dial indicator and set them.
There is a four-page procedure in the Woekshop Manual. Basically, you set the crank to 20 deg ATDC and see if the #1 intake and the #6 intake valves are lifted a specific amount, which varies by model. If not, you turn the crank until the correct valve is lifted the specified amount, loosen the cam sprocket and lock the sprocket hub and cam in place, then turn the crank/belt/sprocket until the crank is on 20 deg ATC. Tighten the sprocket back to the hub, remove the locking bolts, and do the other side.
Bottom line - the sprockets may not be exactly on the timing marks, but if the cams are properly timed, it doesn't matter. You can either hope/assume that the cams are timed correctly, or you can get the manuals and a dial indicator and set them.
07-23-2002, 02:14 PM
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I decided not to touch anything, the car ran great before so why shouldn't it now. Someday I'll take Wally:s advice and do the "four page procedure" 
Regards
/Rehan
Regards
/Rehan
