2350 isx rebuild recommendations

[mikkhh]

(02-17-2026 )gagezuniga Wrote:  I have personally run into bad aftermarket parts from all different manufactures, for instance during a rebuild I measured the crankshaft journals and the measurements were off 8 thou between 3 journals from a aftermarket supplier, the quality and assurance that the part is going to last with aftermarket is not there, you might get lucky but a price will be paid later down the road for pinching pennys up front, if you buy cheap parts you will get cheap results.
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Aftermarket crankshaft? Oh well, they can be used as a boat anchor but not on a modern diesel engine. Some morons (engine builders, part sellers) claim that their aftermarket crankshaft is stronger due to the fact that they have omitted rolled radiuses on crankshafts to make them stronger. That is absolutely false, rolled radiuses are there to improve the fatigue life of crankshaft - https://www.sciencedirect.com/science/ar...2308002739 .

8 thousands of difference may mean that it was just old crank that got reground to first repair size. If crankshaft has to be reground on modern engine (especially 2010+ emissions equipped diesels) then it means that the crankshaft has only use as a boat anchor, reground crankshaft WILL crack at journals, WILL crack at web, question is whichever comes first, neither of those failures is cheap to fix and if you score the jackpot you need another engine. Original crankshafts are induction heat treated and nitrided. Theoretically they can be reground with good results if somebody inspects for cracks and also does the heat treatment and nitriding part again, that can MAYBE happen at engine manufacturer not at a machine shop. Most machine shops are having hard time to even match the crank pin offset and rod stroke, rolled radiuses are ground off center BADLY and that can end up in crankshafts snapping at webs - explained well in depth http://www.n56ml.com/corvair/crankshaft/

Engine bearings have part manufacturers writings on them. You may think that the parts are exactly the same as ones branded with engine manufacturer logos, but that is not the case at all. Most likely those parts are either old discontinued part numbers OR ones that did not meet the quality to be sold under engine manufacturer packaging. On European car engines you can buy standard bearings in three sizes that differ by 0.01mm, aftermarket have only + 0.25 and +0.50 and maybe perhaps +0.75 and +1.00 mm in extreme cases.


Why crankshaft dampers have to be replaced - https://enginemechanics.tpub.com/14075/c...eb-108.htm . Excessive torsional vibrations from lugging engine or bad crank dampener or bad delete or failing injectors are going to wreak havoc on crankshaft and at some point crankshaft WILL snap or get a curvature in it and grind out main bearings - example from a van engine https://rawze.com/forums/showthread.php?tid=10370 . Snapped crankshafts from failed harmonic balancers have happened on even oldschool mechanical diesel engines.