Has anyone here ever come across a condition where the dampener timing marks were way off, as in ~27* (39mm/1.55") BTDC?
I'm putting the finishing touches on a new engine and decided to verify the timing marks, just to be methodical so when I set the cam sensor it is as correct as can be. I did not use a degree wheel because I didn't want to take that much apart, but here's what I did:
I did this twice with the same result. I have not contacted the builder/assembler to see if this is something they checked during assembly, but I could understand the mark not being referenced as they used a degree wheel during assembly and cam installation, long before the dampener would be installed.
I guess it doesn't really matter because mechanical TDC is what it is, but I was/am surprised at such a difference. I wouldn't have been overly surprised at a degree or even two, but 27?! I looked at the dampener still on my original engine and they appear to be identical, so I believe it to be a correct damper on the engine.
Thoughts?
I'm putting the finishing touches on a new engine and decided to verify the timing marks, just to be methodical so when I set the cam sensor it is as correct as can be. I did not use a degree wheel because I didn't want to take that much apart, but here's what I did:
- remove the DS rocker shaft, loosened all the plugs, removed #1 plug
- brought #1 up to near TDC, then backed it down the hole a bit, screwed in a piston stop until it touched and then backed the stop out a thread or so.
- rotate the crank to bring the piston up to the stop, back and forthing a couple times to ensure the stopping, and marked the damper
- rotate the opposite direction and repeat
- measure the distance between the two marks, divided by 2, and marked the dampener from one of the marks (actually, I remeasured from both marks to ensure I didn't screw up)
I did this twice with the same result. I have not contacted the builder/assembler to see if this is something they checked during assembly, but I could understand the mark not being referenced as they used a degree wheel during assembly and cam installation, long before the dampener would be installed.
I guess it doesn't really matter because mechanical TDC is what it is, but I was/am surprised at such a difference. I wouldn't have been overly surprised at a degree or even two, but 27?! I looked at the dampener still on my original engine and they appear to be identical, so I believe it to be a correct damper on the engine.
Thoughts?