2footbraker
Veteran Member
So I've been checking my cam lobes the past two oil changes. First time around, my chamfers were intact and there was some very light concentric ellipses on the lobe tips of 2 and 3 exhaust.
This time (16k km later) I found evidence of some progression. Lobes on cylinder 3 didn't really change. #2 exhaust lobe tip has a bit more flattening but it is offset towards the centre-line of the cylinder.
A new pattern I saw was almost like a follower "slap" on the backside of the cam lobe. This was present on exhaust lobes of cylinders #2 and #3. There is also a bit of a burr on the lobe tip of #2 exhaust along with the flattening.
Here are the pics:
Cylinder #2 Exhaust Lobe (backside).
Notice the pattern is offset towards the middle of the cylinder. When I say backside, I mean the part of the cam lobe that follows the tip on cam rotation.
Cylinder #3 Exhaust Lobe (backside)
Same type of pattern.
Cylinder #2 Exhaust Lobe Tip
This poor picture attempts to show a flattened area on the lobe tip. Again, this wear pattern is offset towards the mid-line of the cylinder. The chamfer was still present but reduced in width and there was a burr on the side of the tip that I could feel with my fingernail.
Talk amongst yourselves.
This time (16k km later) I found evidence of some progression. Lobes on cylinder 3 didn't really change. #2 exhaust lobe tip has a bit more flattening but it is offset towards the centre-line of the cylinder.
A new pattern I saw was almost like a follower "slap" on the backside of the cam lobe. This was present on exhaust lobes of cylinders #2 and #3. There is also a bit of a burr on the lobe tip of #2 exhaust along with the flattening.
Here are the pics:
Cylinder #2 Exhaust Lobe (backside).
Notice the pattern is offset towards the middle of the cylinder. When I say backside, I mean the part of the cam lobe that follows the tip on cam rotation.
Cylinder #3 Exhaust Lobe (backside)
Same type of pattern.
Cylinder #2 Exhaust Lobe Tip
This poor picture attempts to show a flattened area on the lobe tip. Again, this wear pattern is offset towards the mid-line of the cylinder. The chamfer was still present but reduced in width and there was a burr on the side of the tip that I could feel with my fingernail.
Talk amongst yourselves.
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