WTB Good set of rods and pistons

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DonH
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WTB Good set of rods and pistons

Post by DonH » Sat Feb 13, 2021 10:34 pm

Want to freshen 1925 engine with complete valve job and new rings. Now find two pistons are bad, but bearings and crank look good. I don't think engine has ever been apart. If I can find a set 0f rods and pistons it would save me from a complete overhaul. Thanks to all of you!


Topic author
DonH
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Re: WTB Good set of rods and pistons

Post by DonH » Sat Feb 13, 2021 10:37 pm

I was of course going to hone the engine and with new (used) pistons would have to bore the engine.


ModelTWoods
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Re: WTB Good set of rods and pistons

Post by ModelTWoods » Sat Feb 13, 2021 11:03 pm

Is it still standard bore, or an oversize ? Same on the rods. Are rod journals standard or under-size? Want iron or aluminum pistons?


Jeepbone1
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Re: WTB Good set of rods and pistons

Post by Jeepbone1 » Sat Feb 13, 2021 11:22 pm

I have a set of original ford script 0.0025 OS cast pistons I took out of my 27 TT engine. They should clean up pretty good. You can have them for $15 plus whatever the shipping will be. I’m pretty sure you can get a set of 0.010 OS rings and file them to fit the cylinders.

Brad
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Topic author
DonH
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Re: WTB Good set of rods and pistons

Post by DonH » Sun Feb 14, 2021 10:24 am

Thank you Yerry and Brad for your quick reply. Need to examine more closelkly what I have and get back to you. Don


George Hand
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Re: WTB Good set of rods and pistons

Post by George Hand » Sun Feb 14, 2021 12:17 pm

Don, Best to use a bore gauge & measure cylinder bore & taper. also pistons & rods should be weighed when using Mismatched parts and all 4 piston rod assemblies' be same or similar in weight. George


Topic author
DonH
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Re: WTB Good set of rods and pistons

Post by DonH » Sun Feb 14, 2021 6:14 pm

Thanks George for the advice. Don

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Mark Gregush
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Re: WTB Good set of rods and pistons

Post by Mark Gregush » Sun Feb 14, 2021 7:12 pm

Engine has never been apart so you need cast iron pistons? In what way are the pistons bad? Do they just need the skirt cleaned up, need bushings or?
I know the voices aren't real but damn they have some good ideas! :shock:

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Topic author
DonH
Posts: 47
Joined: Wed Jan 23, 2019 10:33 pm
First Name: Don
Last Name: Hanson
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Location: Rochester, MN
MTFCA Number: 22351

Re: WTB Good set of rods and pistons

Post by DonH » Sun Feb 14, 2021 10:36 pm

The pistons themselves are OK I believe. It is the rod fit to the wrist pins on two of the four pistons that are bad. The wrist pin has a lot of movement in the piston. I hope I am making clear the problem, I am not a mechanic, but trying.

Don Hanson


Topic author
DonH
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Re: WTB Good set of rods and pistons

Post by DonH » Sun Feb 14, 2021 10:38 pm

They are cast iron measure dia. 3.738


ModelTWoods
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Re: WTB Good set of rods and pistons

Post by ModelTWoods » Mon Feb 15, 2021 2:02 am

If the wrist pins are loose in the cast iron pistons with 'play', the wrist pin bushings are worn. The original standard cylinder bore was 3.750, so if your pistons measure3.738, that's .012 under-size. What is stamped on top of the pistons? STD., .0025, .005, 010, .031, or .033 ? These were the replacement sizes from Ford. If you measured your pistons, correctly, .012 wear should produce a heck of a racket from piston slap and should affect your compression, too. I'd remeasure your pistons and the cylinder bores. If you don't have a bore gauge, at least measure each cylinder bore near the top and bottom of each cylinder. As for piston rings for the cast iron pistons, they are available from most vendors in STD, .010, .020. .030, .040, and .060. Piston pin bushings are available from the vendors in a set of 8, but you may find someone on the forum who has some singles (you'll need 2 for each one of your two bad pistons).


Topic author
DonH
Posts: 47
Joined: Wed Jan 23, 2019 10:33 pm
First Name: Don
Last Name: Hanson
* REQUIRED* Type and Year of Model Ts owned: 1925
Location: Rochester, MN
MTFCA Number: 22351

Re: WTB Good set of rods and pistons

Post by DonH » Mon Feb 15, 2021 6:44 pm

Measured pistons again today. Still come up with 3.738 to 3.736. This T sitting long time, but I did get it running without much difficulty. Runs a little rough with compression of 35lbs on all cylinders. Pistons are cast Iron STD. Thanks for your advice. Don

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