Not having read the article my guess would be they say 20 years because at that point the following items are pushing their odds on a boat..
2) Motor Mounts
3) HX if equipped
5) Injection pump
6) Water pump
7) Fuel lift pump
Basically, around here, a diesel engine rebuild includes the internals of the engine, machining of any internal parts and the gaskets required to put it back together. These quotes usually only include new rings and gaskets. If you happen to need a new cyl head or pistons the price is on top of the quote because they don't know until they get in there. These re-builds usually DO NOT included the injection pump unless you specifically ask or any other part of the motor for that matter.
My neighbor recently, well three years ago, re-built his Yanmar 3GM and the total re-build cost was over 5k. All he got was R&R of the motor, new rings and gaskets and internal machining and a little spray paint. Suffice it to say most re-builds do not re-build the starter, alternator, water pump, acid dip the HX or even look at most if not all external components..
For 5k every other component on his motor was still pushing 20+ years or original. At that time he was quoted 7k for a brand new motor with transmission and all associated parts. Since that happened, he has continually belly ached about how he should have purchased a new motor because his tranny, alternator, motor mounts and a few other items have since let go too. He's spent well over the price differential between new and re-built in the tree years since he had the Yanmar overhauled.
There was a time when a re-build was worth the differential but with labor rates pushing $100.00 US per hour, and parts cost as high as they are, that differential is very easily eroded and not always worth it when you consider the age, and cost, of the external components when purchased individually..
-Maine Sail / CS-36T
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Last edited by Maine Sail; 02-22-2008 at 08:30 AM.