This morning when I fired up the Monty she knocked 3 times as soon as she started - thunk thunk thunk - and then ran normally. This is by far the coolest morning of the year (50 degrees) so far, and I had similar noises last winter, so I I am pretty sure it is temperature dependent. What could cause this? Maybe piston slap? BTW, plenty of oil pressure and oil level is fine. Anyone else have this problem with this engine before?

Last edited by jmdt; 09/13/07 05:33 PM.