Cam Damage! - PICS
#16
I had another idea... I haven't had a chance to look, but it would be possible that if the timing belt was loose/slipping/or missing teeth then it could be causing the cam to shimmy unevenly around its axis of rotation?
I won't be able to pull the belt off easily to see though... I'll have to look and see if there are any obvious signs...
I won't be able to pull the belt off easily to see though... I'll have to look and see if there are any obvious signs...
#21
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already sent him a PM. :-)
I have seen this issue before and i'd love to get to the bottom of what actually causes this type of falure. If i'm looking at the picture correctly these are the first batch of 4G63 cams we ever sold.
I have seen this issue before and i'd love to get to the bottom of what actually causes this type of falure. If i'm looking at the picture correctly these are the first batch of 4G63 cams we ever sold.
#22
Yea i suppose its possible low oil pressure is an issue, but i have a full set of Defi gauges and oil pressure has never behaved usually. Cold starts fires rite up to 90psi and then warms up to 10-15psi idle. Oil is changed regularly with mobil 1 10w30...
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#28
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What was determined to be the cause of that?
It's been years since I have performed metallurgical failure analysis, but that bottom picture shows signs of a fatigue failure, origniating at a point just to the right of the bottom most hole. Of course, this is just from looking at that one picture and what looks like 'beach marks' at that origination point.
If that was the case, it could have been a defect at that particular point and/or installation error/imbalance.
I'm curious what the cause was determined to be? Makes me miss my materials engineering/failure analysis days.
It's been years since I have performed metallurgical failure analysis, but that bottom picture shows signs of a fatigue failure, origniating at a point just to the right of the bottom most hole. Of course, this is just from looking at that one picture and what looks like 'beach marks' at that origination point.
If that was the case, it could have been a defect at that particular point and/or installation error/imbalance.
I'm curious what the cause was determined to be? Makes me miss my materials engineering/failure analysis days.
#29
That said, before the ticking started, my valvetrain was silent. I never had nay ticking before and it was an obvious and huge difference when this ticking started. The valvetrain was built by JAM using titanium dual spring valves and retainers and JAM spec lifters.