Topic: Counter-sinking (widening) the camshaft oil hole outlet
ive just been stripping a 7m head im rebuilding... checking tolerances etc... and ive noticed that the camshaft oil holes are a simple straight bore. on others cams ive looked at from high perofrmance engines etc, the oil holes are countersunk (widened) at their opening into the cam bearing journal. im thinking this widening of the oil hole outlet is a good idea, allowing the initial outflow of oil into the journal to give more coverage/ lubrication.
should i grab a countersink tool and open up the oil feed outlet holes a little??
one of my main reasons for thinking of doing this is that presently there is the odd significant score mark in the camshaft bearing surface due to oil contamination. these marks start from the oil hole outlet where the debris entered the journal initially, then they do about half a lap around the cam before dissappearing. im thinking that by widineing the oil outlet hole, i will let oil escape into the bearing journal beyond the location of the scores, helping lube the bearing a bit more?
to drill or not to drill....
Sat, 03 August 2002 12:43
