Tappet clearance variation
Posted: Mon Mar 13, 2017 6:48 am
Hi, could anyone throw light on the following points:-
I adjust the R.H. Exhaust tappet to .006" with the piston at T.D.C. on compression stroke.
I noticed that when the piston is approaching T.D.C. (piston approx 1" from TDC) the R.H. Exh. tappet clearance is close to .012" and gradually decreases to .006" at TDC. This variation is only on the one tappet. When checking the R.H.Inlet and L.H. Cyl. Exh. & Inlet the varriation is only .001" (same procedure used).
If wear is the cause for the variation on the R.H. exh.cam, I find it difficult to understand why it should occur on the low side of the cam profile, may be I am missing something! or could it be caused by the cam follower? Do not want to strip the engine again have done so 6 months ago to replace the centre bearing so what other problems could this cause apart from increase tappet noise ?
I should mention that at some time in the past, (prior to my ownership) the engine was fitted with 'high lift cams'
so any idea where I could find the procedure to time high lift cams? I would like to check the timing just in case the mechanic timed it for std cams
Thank you any advice would be appreciated
I adjust the R.H. Exhaust tappet to .006" with the piston at T.D.C. on compression stroke.
I noticed that when the piston is approaching T.D.C. (piston approx 1" from TDC) the R.H. Exh. tappet clearance is close to .012" and gradually decreases to .006" at TDC. This variation is only on the one tappet. When checking the R.H.Inlet and L.H. Cyl. Exh. & Inlet the varriation is only .001" (same procedure used).
If wear is the cause for the variation on the R.H. exh.cam, I find it difficult to understand why it should occur on the low side of the cam profile, may be I am missing something! or could it be caused by the cam follower? Do not want to strip the engine again have done so 6 months ago to replace the centre bearing so what other problems could this cause apart from increase tappet noise ?
I should mention that at some time in the past, (prior to my ownership) the engine was fitted with 'high lift cams'
so any idea where I could find the procedure to time high lift cams? I would like to check the timing just in case the mechanic timed it for std cams
Thank you any advice would be appreciated