Originally Posted by MarkJ
So my question to others who suggest they need their engines rebuilt is why do they think they need a 'rebuild'? And what is a 'rebuild' anyway?
Other words I've heard are "Zero hour the engine". Whats that? Before selling changing the hour meter?
Mark - Good question and I am sure in the boating
world subject to debate but you have to have a benchmark. In the aviation world the generally accepted terms are.
The manufacturer's manual has "Overhaul limits" for everything from bearing journals to camshafts to pistons and cylinders which are larger than the factory new tolerances. Restoring the clearances to these limits is an overhaul
The manufacturers manuals
also contain new limits for everything. Restoring everything to the factory new limits by a 3rd party shop is a Rebuild
Zero Time or Factory New -
If the manufacturer or manufacturer certified shop restores the engine
to Factory New limits it can be considered zero time.
It always pays to define what you are talking about when you talk to the shop. I would view an overhaul
on my boat engine
as two dramatically different things.