Timing belt

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15 years 1 month ago #5451 by 928mac
Replied by 928mac on topic Timing belt
Here are some pictures from my profile page



Drivers side


Passenger side

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15 years 1 month ago #5456 by denhamfly
Replied by denhamfly on topic Timing belt
I have found the timing marks on the cam gear, now I am in the hope and pray mode, because they were off by a lot. This story started when I brought my car to a shop for the water pump and they changed the belt also. The car ran great when I picked it up ,but when I was driving it the next day the timing belt tension light came on and the car would barley run, when I checked out the belt it was really loose. I KNEW BETTER THAN TO GO BACK TO THE SAME SHOP SO I PARKED IT. Now that I have time to work on it, I am hoping things did not get bent. Thanks for ya’ll advice and I might have to ask for more. At the club’s next event if I can make it, I volunteer to donate and cook a big Cajun jambalaya.

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15 years 1 month ago #5495 by N2O-928
Replied by N2O-928 on topic Timing belt

Landseer;5581 wrote: In your pictures that Stan shared with me the car is not at TDC.

The rotors should point roughly to the three O'clock position when at TDC (one is slightly different than the other, but close to 3 O'clock). Then, at that position, with harmonic balance at O/T, the nicks become visible and aligned.



Your rotors, as shown in your pictures, are more like the 10 O clock position.
I show below the position of the passenger rotor at harmonic balancer O/T (TDC).
Hard to see due to resolution, even by zooming with ctrl key / spinning mouse wheel -- but my rotor points sort of towards 3 O clock, in line with the timing warning wire that is hanging there.

The marks on the front of the cam gear are not relevant. Those pill shaped indentations mean nothing to the alignment.

The alignment nick-marks on the rear edge of the cam gears, behind them so-to-speak, are what you are looking for. These critical nick marks are not visible until the car is more closely approaching TDC. Your's might be closer to 45 deg btdc in your pictures.


One fact that bothers me about the process --- with crank locked per instructions at 45 degrees before TDC, when removing and replacing belt---- you don't have visiblity to the cam gear marks to ensure one camshaft didn't move while the belt was off. So most of us make separate reference marks on front of gears with a magic marker --- just to confirm they didn't move relative to each other while you are doing all the other work before putting the belt back on.


This is correct all 32 valve engines use the exact same gears, and they are different from the 16 valve gears. The marks on the outside facing edge have nothing to do with valve timing.

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