Z-134 crankshaft

pomester

Member
I talked to the machine shop yesterday and they gave me the bad news that the crankshaft associated with my TO-35 is out of spec and cannot be turned again.

Looking at options, new crankshafts are available from several sources and our host here also offers reground ones.

Does anyone know anything about the new crankshafts offered? Chinese manufacture, or somewhere else? There's not a large difference in cost between the options. My inclination is to go with a reground OEM unit, but if I could feel confident in a new crankshaft it would arguably be better. If anyone here has a grindable crank for sale, my email is open. The shop I am using grinds cranks.

The shop also gave me the news that the head was cracked, but repairable (~$375 before the valve job).

I'm going to have the value of the tractor wrapped up in this overhaul..
 
(quoted from post at 07:23:18 03/28/23) I talked to the machine shop yesterday and they gave me the bad news that the crankshaft associated with my TO-35 is out of spec and cannot be turned again.

Looking at options, new crankshafts are available from several sources and our host here also offers reground ones.

Does anyone know anything about the new crankshafts offered? Chinese manufacture, or somewhere else? There's not a large difference in cost between the options. My inclination is to go with a reground OEM unit, but if I could feel confident in a new crankshaft it would arguably be better. If anyone here has a grindable crank for sale, my email is open. The shop I am using grinds cranks.

Where are you located? I nave most of a TO-35 parts tractor that has the head and crank that might be useable, but I haven t had them checked out. If you re anywhere near, you re welcome to take a look.

The shop also gave me the news that the head was cracked, but repairable (~$375 before the valve job).

I'm going to have the value of the tractor wrapped up in this overhaul..
 
Hi,



Ive rebuilt engines on TO30s and refreshed my TO35 engine a while ago. Had to replace a crankshaft on a Z129 engine with new and had
no problems with it.



So, if you can find a good used one great, otherwise the new (not made in usa) ones do work.



Keep us posted.



Tom
 
Pomester, For me I would go with a reground crank if I had a shop I trusted. The surface finish, diameter tolerance and most important the corner radius are key
features for crankshaft life/engine oil pressure.

Question: does your shop off set grind crank shafts for longer stroke? I am in Northern Indiana and need a shop to grind an 8N crankshaft - could you provide the
name/address of the shop? Thank you.
 
Google 'C&P Machine' in Fort Wayne. I don't know about offset grinding, but they do a lot of business with everything from antiques to modern truck/heavy equipment. They have always been pleasant to me with my odd/smaller projects.
 
Thanks Myron - I've enjoyed traveling thru your part of the country - but probably won't make the trip for tractor parts...
 
I traveled to the machine shop this evening (open till 8pm on Wednesdays) and got things back on track. Apparently they had tried to call me (once) and the answering machine didn't pick up or something so things have been sitting around for a couple weeks.

I went ahead and ordered the remanufacture OEM crankshaft from our hosts. The new crankshaft was out of stock, so not a hard decision. This crank is turned .010" under and so should have lots of life left for the next generation. I am going to take it to the shop when it arrives and have them evaluate the machining.

I had them place the head into the queue for repair. The one guy who does this (head welding) was there and said he had 47 jobs in front of him, but since the date on my ticket was Feb 15 he would slip it in ahead of most. Still will be a 3-4 weeks. I'm shopping for another head, but the problem being that anything used is a pig in a poke, and might well be worse than the original.

Talked to the parts counter and got things arranged. We will wait for the crankshaft to arrive before ordering bearings, just to be sure. The overhaul kit is just a couple days away so that can wait for the crank to arrive. I should be able to pick up the bottom end and bring it home, assemble, and even get the tractor rolling again while I wait on the head.

I had done some research on the cam/crank gears and found out about the various over/under sized gears. I checked the block while I was at the machine shop and the stamping on the front gasket surface indicated a +.002 oversize gear association. I have a set of standard gears I purchased right at the start because the existing gears were ugly. After the research I was worried they might be tight, but now I find they might be loose. The over/undersized gears seem to be unobtainium, but jensales list them, I will check tomorrow and hope for a miracle. I have a machinist I could probably talk into cutting bigger gears smaller, but I don't think there is any way to make them bigger. If all else fails I will run them loose, it's better than tight...

This was suppose to be my winter project and now it's spring...
 
Thanks -

I purchased a remanufactured OEM crankshaft from our hosts. .010" on both mains and rods. I'll take it to my machine shop this week for evaluation and double check before ordering bearings.
 

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