Quote:
Originally Posted by Old Henry
Don't know what "line boring the mains" means. Hopefully Paul knows.
The crank going back in is the original that came with the engine when it was new and has never been ground. The pilot bearing in the flywheel is a ball bearing, not just a sleeve/bushing. Wouldn't hurt to replace it if I can find one. The ones I've found are just the sleeve/bushing kind.
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Within your response is at least one huge clue as to why your engine came apart. You'd told us in the past this particular engine was "rebuilt" twice. You've also been proud (rightly so) to inform us that you've driven a kajillion miles on it.
Now you tell us the crank has never been ground? Um Henry, that engine was NEVER rebuilt. Installing new bearings against an old crank is a certain recipe for disaster. I can only imagine what else was "rebuilt" in such poor fashion.
The fact you got as many miles out of that engine was a true blessing.
I am happy to know you have finally decided to take this engine to a guy that apparently actually knows what he is doing.
Line boring may not be necessary as these old Ford flat head engines can handle a lot of punishment. However, it is certainly something I'd check during the preliminary inspection. Not only does it assure the crank and cam are running on a single TRUE plane, it should also make that plane perpendicular to the lifter & piston bores.
I can almost guarantee the rods will need to be reconditioned. If they are still round, well, it would be a miracle.
As others have advised, be 100% certain that block is thoroughly cleaned prior to reassembly. A true rebuilder will know this and make certain cleanliness is paramount. It is perhaps as important (or nearly so) as measuring ACCURATELY and fitting parts CORRECTLY.