slam
Veteran Member
Do I need a thicker head gasket?
Finally tore down the head to fix a leaky head gasket. Had the head resurfaced and valves redone. Reassembled everything, torqued the head down, but now the motor won't turn by hand back to TDC (we had moved it off TDC to clean the block surface). It's shy by about 4 maybe 5 teeth when looking down through the flywheel window. I can use a mirror to see the TDC mark just out of reach.
One of the pistons seems to be hitting on a valve. We know this because if we loosen the cam shaft caps (slowly, so as not to warp the cam) then the motor will rotate free and easy to TDC and beyond. Tighten the cam back down and lock the cam to TDC and the motor sticks again before the motor can get to TDC.
The head resurface took off 0.005" which comes to 0.127 mm. I replaced my original 2-hole head gasket with another 2-hole gasket. Would moving up to the 3-hole fix this issue? Are the tolerances really that tight or is something wrong with a valve or shim that's keeping a valve slightly open?
Finally tore down the head to fix a leaky head gasket. Had the head resurfaced and valves redone. Reassembled everything, torqued the head down, but now the motor won't turn by hand back to TDC (we had moved it off TDC to clean the block surface). It's shy by about 4 maybe 5 teeth when looking down through the flywheel window. I can use a mirror to see the TDC mark just out of reach.
One of the pistons seems to be hitting on a valve. We know this because if we loosen the cam shaft caps (slowly, so as not to warp the cam) then the motor will rotate free and easy to TDC and beyond. Tighten the cam back down and lock the cam to TDC and the motor sticks again before the motor can get to TDC.
The head resurface took off 0.005" which comes to 0.127 mm. I replaced my original 2-hole head gasket with another 2-hole gasket. Would moving up to the 3-hole fix this issue? Are the tolerances really that tight or is something wrong with a valve or shim that's keeping a valve slightly open?