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Old 10-25-2010, 05:59 PM   #1
340Duster
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Default Timing mark issue while finishing build... need help.

So I hope this is the last question to finish putting my new engine together. Yesterday I installed a complete new timing set from Gates according to the service manual instructions. All of the marks line up properly with the cam gears, the crank gear, the block, and the timing marks on the timing covers.

However, after pulling the pin on the tensioner and spinning the engine over 2 times to put them back only the RH cams line up with the crank. The LH cams appear to be half a tooth off. There's no way it can skip a tooth, so what gives? The LH cams line up together and with the covers, but the crank is then off half a tooth.

The only thread I could find was this one http://forums.nasioc.com/forums/show....php?t=1767038 And a solution was never posted

A picture to show how the belt and marks were aligned at the beginning. Sorry for no picture to show the LH cams after the engine is spun, but its very similar to the one in the above thread. The only other information I could find someone stated that this is the nature of DOHC engines, and they won't come back to perfectly lined up. *Edit* I haven't been back home yet to count the teeth between gears to see if that tells me anything more.

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Old 10-25-2010, 07:12 PM   #2
john 1badSTI
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it is normal for the drivers side to be about half a tooth off with a new belt.
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Old 10-25-2010, 09:04 PM   #3
340Duster
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That makes me feel a little better.
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Old 10-25-2010, 09:43 PM   #4
sense of nature
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Quote:
Originally Posted by john 1badSTI View Post
it is normal for the drivers side to be about half a tooth off with a new belt.
Yea it's totally normal
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Old 10-25-2010, 10:02 PM   #5
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Just not stretched yet. Clean engine. Did you do a write up.
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Old 10-26-2010, 12:18 AM   #6
340Duster
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Quote:
Originally Posted by sackytar View Post
Just not stretched yet. Clean engine. Did you do a write up.
Thanks guys. Not yet. I have a flickr album of the progress. http://www.flickr.com/photos/4913125...7624984952574/
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Old 10-26-2010, 12:25 AM   #7
FuJi K
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when you install the new belt, you get it to the marks, it may be off by a little. When you crank the motor or say when you start the motor, the markings will never come back. You gon have to spin that motor millions of times to get it to come back to the same markings.
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Old 10-26-2010, 12:33 AM   #8
340Duster
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Oh I realize the marks on the belt will never line back up with the timing marks all at once. The marks themselves on the LH gears are slightly off with the new belt.

Quote:
Originally Posted by FuJi K View Post
when you install the new belt, you get it to the marks, it may be off by a little. When you crank the motor or say when you start the motor, the markings will never come back. You gon have to spin that motor millions of times to get it to come back to the same markings.
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Old 10-26-2010, 01:04 AM   #9
Jessekrs123
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Don't go by the marks on the belt itself, go by the marks on the timing cover and the sprockets themselves. I just did the timing belt on my mother's 96 Legacy, and I kept noticing on the right side, the mark on the belt was not lined up with the mark on the cover, I looked at the sprocket mark and it lined up with the one on the cover. The belt mark seems a little offset, but as long as the marks on the sprocket and the cover line up, you're good to go.
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