329 or 359 Crankshaft

J. Schwiebert

Well-known Member
We have a Deere here with one of those 2 engines and of course the local experts tell us since it has a rod knocking we need to order a new crankshaft because you can not grind those Deere cranks. Is this just a story? If the Rockwell checks good why not or is Tuff-Rided or other treated crankshaft? Thanks for any help. J.
 
JD engineers didn't agree with your "local experts"

329
AT21130 BEARING 1 (B) 0.05MM (.002") (2 HALVES)
AT21132 BEARING 1 (B) 0.25MM (.010") (2 HALVES)
AT21134 BEARING 1 (B) 0.50MM (.020") (2 HALVES)
AT21136 BEARING 1 (B) 0.76MM (.030") (2 HALVES)

359
RE27352 Bearing Kit 1 X ID=STD, (KIT (2) R83380 OR (2) R100 808 OR (2) T23214) (KIT (2) T23214)
RE27353 Bearing Kit AR X ID=-0.254 MM (0.010"), (KIT (2) R87750)
RE27360 Kit AR X ID=-0.508 MM (0.020"), (KIT (2) R87756)
RE27368 Bearing Kit AR X ID=-0.762 MM (0.030"), (KIT (2) R87759)
 
Lots of places do not like to grind diesel cranks.
Or even build up and regrind gas cranks. I had an old fork lift Waukesha engine need on rod journal built up and ground to standard or ? they did it but were sure to point out there was no guarantee.
The place I went to had a good reputation so I was not too worried and it did hold up fine.
 
I used to weld them up & grind them when I worked in a machine shop. Ford shafts we didn't do as they were a different material. If it warped from welding, you couldn't straighten it without breaking. I once welded up a 2 cylinder JD journal that took 9 1/2 minutes of steady burning one bead. After it was ground I never seen or heard of it again. It may still be running.
 
2 cylinder gas cranks are routinely welded so far that they get as much as 2" of additional stroke- when ground most of the original journal is gone. They are braced before welding & straightened, balanced etc & then subjected to 3 or 4 times the original hp, with heavier rods/pistons, & double the RPM. It's very rare that they fail. in an unrelated story/subject :
As for removing 20 or 30 THOUSANDTHS off an un-welded diesel crank that will not see any more hp/rpm- it means absolutely NOTHING whatsoever towards the reliability of that crankshaft. Pullers turn the rod journals down to a much smaller size to gain stroke on these & then run much higher hp/boost/rpm. Have you looked at 0.030" lately? It's a piece of heavy tin foil removed from the surface. Come on guys?! As for welding the diesel cranks I have no comment or opinion (ignorance)
 
We welded them when they needed it . Check the parts book for undersized bearings. I wouldn't grind down any more than that but I don't have a problem welding them up. Too many part exchangers anymore ,no body "repairs " anything nowadays .
 

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