jook24
Well-Known Member
whats a good way to break in rebuilt engine cat 3066 excavator.
As a kid I vaguely remember my older family and friends talking about breaking in engines with pure mineral oil. It stemmed from my grandfather being a B-25 mechanic and this was their procedure for breaking in new radial engines. That logic trickled into breaking in rebuilt 2-stroke motorcycles, 1960's V-8 muscle motors, etc. The logic was the mineral oil was just enough lube to keep the journals in good shape while allowing the rings and rod guides to seat from the lack of wear additives. I also remember the 'drive it like it's stolen' with attention to constantly varying the rpm.As nobody mentioned yet, I was always told to use conventional oil not synthetic for the break in. Supposedly synthetic is too slippery to allow the rings to seat.