todo
Active member
After months of struggling to diagnose a timing problem on my 2005 Passat wagon I discovered that the keyway on the camshaft sprocket hub had been damaged somehow, causing the timing to be extremely advanced. The mystery is that prior to pulling the engine (to do a BSM delete and a manual swap) the engine had been running perfectly. I brought the engine to a mechanic (who turned out to be an incompetent con) to do the BSM delete. In the process he also installed a new timing belt and water pump. When I reinstalled the motor in the car it would barely run and because I removed and reinstalled the engine twice (another story) and had the ECU tuned I assumed the problem was human error. I checked the timing belt about 5 times before I pulled the camshaft hub off and discovered the damaged keyway.
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The first picture shows the normal key, the second shows my damaged hub. The key is one with the hub, not separate, and it appears like the key has been sheared to be offset. As far as I know the engine has not had any catastrophic events.
After installing a new camshaft hub the car ran perfectly.
My questions are-
Has anybody seen this kind of damage before?
How does this happen?
The first picture shows the normal key, the second shows my damaged hub. The key is one with the hub, not separate, and it appears like the key has been sheared to be offset. As far as I know the engine has not had any catastrophic events.
After installing a new camshaft hub the car ran perfectly.
My questions are-
Has anybody seen this kind of damage before?
How does this happen?
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