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Another pony motor parts thread (D4 7U43126)
Another pony motor parts thread (D4 7U43126)
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Posts: 60
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Thank you received: 4
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3 years 11 months ago #223100
by Alexjfrench
I know every must get sick of reading these but I was hoping to get some input on where to go for obsolete parts. The oil return tube inside the pony motor of my D4 cam off and bounced around inside the block and slightly chewed up both pistons. I went to Cat and the .020 pistons are NLA ( PN 8H2762 or 2F3664). The rings are available but not the pistons. I called Florin and they do not have them either. Anyone know what my options are for pistons? Can any suggest another vendor to try? Lastly, do the .020 over rings have to be run with the .020 piston? Is it possible to put oversized rings on a standard piston? That might be a dumb question. Thanks.
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3 years 11 months ago #223103
by Mike Meyer
Alex, you are right, there are thousands of old threads on the topic, if you do a search through many of them you will see there is a company in Australia that has been making pilot motor pistons for a loooong time, you tell them what size you need and they supply the piston, rings and pin to suit your bores.
The company is J.P Pistons, they have a website, the D2/D4 pilot piston is P/N JP0154, last time I asked, a new piston with rings and pin was around $US80 a piece, your other option is to re-sleeve your block back to standard size, or put a request in the For Sale / Wanted section of the ACMOC magazine and on here, someone might have oversize pistons.
Good luck
Mike
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3 years 11 months ago #223104
by Bmr
I have good used .020 piston also the oil tube
Calls are best 507 402 2720
Thanks Jon
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3 years 10 months ago #223261
by trainzkid88
you cant run different size rings on a piston they are matched sizes.
you have 2 options get oversize pistons made by a company such as j.p pistons in south aust.
or have the motor sleeved back to a size
it is also possible to get pistons from something else turned down to fit and re-groove them though a set from j.p. is probably cheaper.
as for the feed tube try a hydraulics supplier such as enzed or pirteck they may be able to supply the tubing and fittings if you can get an example to copy.
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3 years 10 months ago #223290
by Paso Bob
Have you considered adding a direct starter? My 7U is 43,159 and I know yours has the plate and studs already factory installed. I have a 12V starter and will keep the pony for cold starts too.
D-4 7U-43159 with 4S dozer and Cat 40 scraper, D-7 3T-1179 with Cat 7S hydraulic dozer, D-7 17A 13,944, D-8 14A-1160 with Cat 8S cable dozer, Cat 12-99E-4433 Grader. All runners and users.
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Another pony motor parts thread (D4 7U43126)
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