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Harry Ferguson Tractors Discussion Forum

Z134 overhaul kits - why overbore?

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William Fissell

01-09-2018 19:50:37

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will embark on reassembly shortly (I hope!).

It seems the kits on this site are 'overbore to 3 3/8'

Why is this and do I care?

thank you


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Tom h.

01-10-2018 17:12:43

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 Re: Z134 overhaul kits - why overbore? in reply to William Fissell, 01-09-2018 19:50:37  
I just did a MF35 engine rebuild last spring. Went with the Tisco kit with no problem. I would recommend sending the head out to be rebuilt, that is where your compression is assured.

Not sure either why the over bores. My rebuilt TO30ís are all overboard with the same 3-3/8 pistons. No problems just a bit more power.

Keep us informed on your progress

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William Fissell

01-10-2018 17:47:30

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 Re: Z134 overhaul kits - why overbore? in reply to Tom h., 01-10-2018 17:12:43  
Will do.

block cracked in usual places all three webs between cylinders top to bottom

machine shop said yeah that thing is gonna dump coolant in the oil. Have a salvage block on its way.

yes will rebuild the head but probably do myself as I have valve and seat grinder - usually do my own after its been tanked and magnafluxed..

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01-10-2018 06:52:22

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 Re: Z134 overhaul kits - why overbore? in reply to William Fissell, 01-09-2018 19:50:37  
Not sure why they do that, never noticed until now.

Maybe they think most people would want the overbore, don't know...

I did see they are offering a complete kit with a NEW crankshaft.

Just be careful, everything is aftermarket. Measure and compare, take nothing for granted!

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01-10-2018 06:01:56

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 Re: Z134 overhaul kits - why overbore? in reply to William Fissell, 01-09-2018 19:50:37  
I always buy the sleeve kit. New sleeve-piston-rings. You may need rod bushings for new piston.

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