steveh1155
Member
We have a 1950 8N front mount 6v with a tapping sound coming from the #4 or #3 cylinder area. The engine was professionally rebuilt about 7 or 8 years ago. I was thinking maybe it was a valve issue so I bought a compression tester and checked compression. I'm getting 90#, 90#, 90#, 90# which appears to be normal, so maybe not a valve problem. The tractor has no problem developing enough power for the mower up hills and governor seems very responsive and oil pressure is always about 35 pounds when running, just this annoying tapping sound that sounds almost like a valve lash that too loose. The only thing I did notice when changing the spark plugs was slightly more carbon on the #4 plug, which is the area where the sound is coming from. I'm assuming that valve lash on this engine is adjustable - are any special tools required to do this? Thanks!