Any opinions on this idea?
Patient: 02 VN750 with 4,600 miles.
Problem: Engine knock that seems to be coming from upper portion of front cylinder.
So far I've: Ckd. compression (155 in both cylinders) Ran engine on just rear cylinder (Knock still there), Removed front cylinder cover. Checked oil pressure, ( Checked O.K.) I'm getting oil to top of cylinder.
I'm thinking the problem may involve the front HLA's.
In an effort to eliminate a possible HLA problem, I'm THINKING of trying to remove the front cam cap, removing the rocker arms ( to allow the cams to freespin), replace the cam cap, remove the front spark plugs, and run the engine on the rear cylinder to see if the knock is still there.
I've also removed the front exhaust manifold, the action of the exhaust valves looks O.K. The only thing I noticed is that the exhaust residue is very dark, indicating a rich fuel mixture.
Any opinions or suggestions would be helpful. Could a HLA problem be causing the knock?
I've replaced the acct's already, no change or improvement.
Last edited by dodger; 10-05-2011 at 01:15 PM.
Reason: additional information