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Farmall & IHC Tractors Discussion Forum

Farmall head question

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08-07-2016 11:34:30

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my Farmall H has the 8043-DC head,,I was going to order piston for it and the ones I want have a slight step in the to top of the piston,,will these clear the head or am I going to have to order flat top pistons?,,also my sleeves are all in pretty good shape yet and I do not really want to order sleeves if I don't have to.

this is the kit I was looking athttps://www.yesterdaystractors.com/Farmall-H_Basic-In-Frame-Engine-Kit-C152-Gas-Stepped-Head-Pistons_BIFH1156A.html

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08-07-2016 13:28:40

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 Re: Farmall head question in reply to 1946Farmall, 08-07-2016 11:34:30  
Make sure you know for sure what the current bore is. Most Farmalls have had replacement sleeves put in that increase the size of the bore for more power. Make sure you check actual piston clearance, Between .003 and .005 is OK. Also check ring end gap with the ring in the cylinder near the bottom pushed in square with a piston as a pusher tool. Gap should be .004" per inch of cylinder bore, measured with feeler gauges.
Be sure to remove all evidence of ridge at the top of the sleeves even a tiny amount can cause issues. If you can feel it it for sure needs to be ridge reamed. Jim

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08-07-2016 15:33:23

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 Re: Farmall head question in reply to Janicholson, 08-07-2016 13:28:40  
I haven't checked the bore yet,I assume it has a 7/16 overbore but I need to measure to verify,,I need to borrow the tools for this though and I also need to plastigauge the rod bearings as well.
the pistons are aluminum flat top so I don't believe them to be original for 1946 and I wanted to make sure the stepped pistons wouldn't bang the valves causing me more work.
I had bought a flat top piston from ebay before I tore the engine down but it is cast iron and will not work.,
I am trying to get by without doing the sleeves but I don't think it's going to happen as people tell me the piston should be matched to the sleeves

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08-07-2016 17:59:55

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 Re: Farmall head question in reply to 1946Farmall, 08-07-2016 15:33:23  
pistons are only matched to the sleeve when they are new and honed to fit with the correct clearances. other than that u can use any used or new piston in a used sleeve. as the clearances are already over minimum and could be maximun or even more.

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D Slater

08-07-2016 13:08:37

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 Re: Farmall head question in reply to 1946Farmall, 08-07-2016 11:34:30  
Should fit with no trouble.

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gene bender

08-07-2016 11:39:19

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 Re: Farmall head question in reply to 1946Farmall, 08-07-2016 11:34:30  
No the piston is made to have valve clearence.

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08-07-2016 11:36:23

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 Re: Farmall head question in reply to 1946Farmall, 08-07-2016 11:34:30  
this kit https://www.yesterdaystractors.com/Farmall-H_Basic-In-Frame-Engine-Kit-C152-Gas-Stepped-Head-Pistons_BIFH1156A.html

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