randy_elledge
New member
"I have 1954 chris craft sport
"I have 1954 chris craft sportsmen with a hercules MBL 158HP motor. The problem is a knocking problem that increases with RPM.I did a compression check all six cyl were 107 to 120PSi.The oil pressure at idle is 3-5 lb increasing to 10lb at 2,000 RPM. There is a lot of back pressure and smoke coming out of the breathers at 2,000RPM. My guess is the bearings are going. Can new bearings be installed from bottom side only leaving top end alone? Or is this wishfull thinking.
Thanks"
"I have 1954 chris craft sportsmen with a hercules MBL 158HP motor. The problem is a knocking problem that increases with RPM.I did a compression check all six cyl were 107 to 120PSi.The oil pressure at idle is 3-5 lb increasing to 10lb at 2,000 RPM. There is a lot of back pressure and smoke coming out of the breathers at 2,000RPM. My guess is the bearings are going. Can new bearings be installed from bottom side only leaving top end alone? Or is this wishfull thinking.
Thanks"