Timing belt walking off gears
09-03-2009, 12:04 AM
#21
on your last vid i noticed your belt is tilted in the at rest contition could someone have not shimmed or whatever your cams making them be closer to the block and causing the **** to be slanted and walk around like it was doing? Grab your straight edge and see if you can get a reading on how straight your gears are on the horzintal, and i would throw a level on there to see if maybe something isnt tilted on one or both gears. 9-10 times i see **** like that at work its a pulley or gear problem being misaligned. If this doesnt do it then i would make sure the teeth are clean on the gears this would throw a good bit of slack into the system as wel.
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09-03-2009, 12:16 AM
#22
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A. Use your camera's flower button.
B. I have no idea what your problem is.
C. Your poor starter and battery.
The 2nd video is really confusing. It walks towards the right immediately, than slowly walks left. Do you have access to a mag base and indicator? I'd check flatness of both pulleys and all 3 sprockets. Not 30 minutes ago I finished installing my own timing belt. After a minor hiccup with one of the cam sprockets being on incorrectly (smoke out the air filter
), it started up immediately and didn't budge. I double checked cause I had this thread in the back of my head the whole time.
B. I have no idea what your problem is.
C. Your poor starter and battery.
The 2nd video is really confusing. It walks towards the right immediately, than slowly walks left. Do you have access to a mag base and indicator? I'd check flatness of both pulleys and all 3 sprockets. Not 30 minutes ago I finished installing my own timing belt. After a minor hiccup with one of the cam sprockets being on incorrectly (smoke out the air filter
), it started up immediately and didn't budge. I double checked cause I had this thread in the back of my head the whole time.on your last vid i noticed your belt is tilted in the at rest contition could someone have not shimmed or whatever your cams making them be closer to the block and causing the **** to be slanted and walk around like it was doing? Grab your straight edge and see if you can get a reading on how straight your gears are on the horzintal, and i would throw a level on there to see if maybe something isnt tilted on one or both gears. 9-10 times i see **** like that at work its a pulley or gear problem being misaligned. If this doesnt do it then i would make sure the teeth are clean on the gears this would throw a good bit of slack into the system as wel.
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09-03-2009, 12:25 AM
#23
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Wobble yes, but magna has a point, although poorly worded.
If the camshafts are not sitting flat in the journals, or at least one of them, the pulley will not wobble, but will be sitting with a titled axis and cause the belt to walk. It'll also most likely ruin your bearings and head.
If the camshafts are not sitting flat in the journals, or at least one of them, the pulley will not wobble, but will be sitting with a titled axis and cause the belt to walk. It'll also most likely ruin your bearings and head.
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09-03-2009, 12:37 AM
#24
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Wobble yes, but magna has a point, although poorly worded.
If the camshafts are not sitting flat in the journals, or at least one of them, the pulley will not wobble, but will be sitting with a titled axis and cause the belt to walk. It'll also most likely ruin your bearings and head.
If the camshafts are not sitting flat in the journals, or at least one of them, the pulley will not wobble, but will be sitting with a titled axis and cause the belt to walk. It'll also most likely ruin your bearings and head.
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09-03-2009, 12:44 AM
#25
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DEAR GOD! Tell me that belt isn't as loose as it looks. Exactly how much deflection do you have between the 2 cams? Unless the photos are playing tricks with my eyes, I can see the belt loose enough to curve between the exhaust cam and the idler pulley. Being too loose like that would certainly cause it to walk back and forth like that. I was expecting just a gradual movement to the outside, not a back and forth dance like that.
Yeah, on second thought, TIGHTEN THAT BELT! Does anyone else see the belt wobble on the first video between pulses? If I'm seeing it right, that belt is WAY WAY WAY loose. I know there will be a little slack on the non tension side, but should it be enough to let the belt flop around like that?
Yeah, on second thought, TIGHTEN THAT BELT! Does anyone else see the belt wobble on the first video between pulses? If I'm seeing it right, that belt is WAY WAY WAY loose. I know there will be a little slack on the non tension side, but should it be enough to let the belt flop around like that?
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09-03-2009, 12:48 AM
#26
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Like I said, I just did my timing belt and I had wobble like that between the gears as well. I'm going to redo it, but again like I said, it didn't walk.
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09-03-2009, 01:02 AM
#28
Wobble yes, but magna has a point, although poorly worded.
If the camshafts are not sitting flat in the journals, or at least one of them, the pulley will not wobble, but will be sitting with a titled axis and cause the belt to walk. It'll also most likely ruin your bearings and head.
If the camshafts are not sitting flat in the journals, or at least one of them, the pulley will not wobble, but will be sitting with a titled axis and cause the belt to walk. It'll also most likely ruin your bearings and head.
yeah wes make sure all the gears are straight up with each other and then make sure you didn't leave a **** ton of slack between the gears.
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09-03-2009, 11:55 AM
#29
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I would say it's time for a new belt. From your pictures, it looks like the belt is barely even touching the idler pulley. How much tension is on the belt at the top of the two cam gears? The belt should require some effort to pull it over both cam gears, and if it just slides over with ease, then perhaps you have a wrong belt that's too big?? But yah, I third the way too loose sentiment.
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09-03-2009, 12:26 PM
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My guess on how it got so loose is he didn't make however many rotations the book calls for. Two full turns or something, to remove any slack on the other spans between the exhaust and intake cam, exhaust to idler, idler to crank. If you just removed slack from the tensioner span of belt, the other part of the belt would likely be about that loose.
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