Crankshaft verdict.

Posted by spiffy1 on January 19, 2009 at 17:45:18 from (70.41.137.72):

After double checking it yesterday, both the rod and cap definitely would bind before moving 45degrees without even being assembled to the other.

Still not sure whether the two cranks came from opposing ends of factory tolerance, or the tractor that had the new rods had been ground a few thousandths; regardless, I doubt I could have cranked that tractor, even with 10shims each side - let alone much chance of wearing in without burning the babbit.

Sooooo; called a couple shops this moring; the one boiling out the block was at least a week leadtime and didn't have the right person to talk to anyway this morning. The conversation with the next shop went something like:

I said, “Can you guys do a quick dirty job dusting a thou or so from the high sides of a heavy old tractor crank; no need to bring it to a spec all around?” “ Don’t need to polish it either, only turns 1050 & I’ll clean it up with crocus before I put it in anyway.”

Phone, “Babbit?”

Me, “Yeppp”

Phone, “Ahhhh, you got an oval crank binding on you huh? [I'm not sure if he assumed I had a new babbit job, or I somehow indicated the salvage rods] The clearance sets with shims?”

Me, “That’s it”

Phone, “Bring it in - we’ll take a look; probably can sneak it in sometime early this week.”

That was enough for me to make a trip to town! He felt around the journals: "yeah, a few nasties on it [this thing threw chunks of babbit from #2 & #3 last time it ran; I hadn't mentioned that] - those should come out just fine though while bringing it back to round. Roller bearing ["ball bearing" I corrected, but still impressed a performance shop recognized these] mains; just need to do the rod journals...."

I was happy enough, only one question left: "Ballpark cost?"

"Around $100; just a little more if we polish it too."

Being real optimistic, I considered maybe half, but most likely a just a bit more than the $100, and equally possible to optimistic: pessimistic guess of over double, so I said "you may as well do the polish too."

So, I should have all the parts back by the end of the week! :D

Still going to have a few random pits, but no worries there; like "beauty marks" how about "lubrication reserviors?" :lol:

I know; I wound up doing exactly the opposite everyone suggested, but I really did appreciate all the replies [and had I been able to avoid binding with the shim stack, would have just hand polished it and used it "as is"]: Thanks everyone! 8)

Replies:

• Re: Crankshaft verdict. spiffy1 11:39:14 01/22/09 (0)
• Re: Crankshaft verdict. Janicholson 19:29:57 01/19/09 (0)

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