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Tractor Pulling Discussion Forum

IH 806 LP Pistons

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superhooker

01-01-2006 18:55:56




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I have a 301 from a 806 LP tractor that's stuck. The engine is disassembled and on the engine stand and I was able to get 2 pistons out easy, but the other 4 are stuck tight from rust on the cylinder walls. The part number on these pistons is 392828R2. Does anyone know of a replacement piston for this number that makes the same compression? The 2 I removed are in very good condition but I may have to destroy the others to remove them. I may have to bore the block to clean up the cylinder walls. Is there a 4" diameter piston that will work on the stock rods that will make as much compression as the LP pistons? Any ideas appreciated.

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OLDIHPULLER

01-03-2006 08:35:27




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
We bored our block to 3.875" and run chev 292 6 cyl. pistons. Been running them for 20 years no problems. These pistons have the correct compression height. That bore gives 311 ci. I used a .005 oversized chev wrist pin press fit in rod. This set-up gave me about 160 lbs. comp. These Chev pistons are availiable anywhere and very inexpensive and durable. Pistons also come in .010,.020,.030 oversize. OIHP

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SUPERHOOKER

01-02-2006 16:47:59




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
I got the 3rd piston out with hydraulic pressure. I screwed threaded rod into the head bolt holes and suspended some heavy square tubing about a foot above the block, under which I put a bottle jack. Worked pretty good. I'm going to post a photo of the piston shortly to see if someone can identify it.



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Charles McNelly III

01-02-2006 15:59:51




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
Get ahold of some KROIL oil and pour it on top of the stuck pistons. They"ll be free in no time.
Good Luck"
Charles



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es

01-02-2006 14:02:37




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
get aset of IH 504 rods bore block to 4" ford KB pistons send cam out and good port job bigger valves i thing they were out of a 351 ford have your machine shop off set grind crank fill block half way up with hard block so you still can run water you will have one good running motor i think it came out to 356 cii cant fined paperi hadpart# for valves and pistons



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ChadS

01-02-2006 13:36:26




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
If they are the pistons Im thinking of,,, they are not replaceable! You will not get back the exact piston you already have. You will get the stock firecraters, which will be a lower compression ratio. If your current pistons do not have much of a crater in them at all, they are the ones Im thinking,,, But, if the crater is very deep, they are just plain jane 301 pistons. BUT, if they are the good ones,,, too bad,,,, they are a great piston! ChadS

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ejr-IA.

01-02-2006 10:29:59




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
They make over bore pistons for that engine up to 60 over for under 400bucks.



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Max puller

01-01-2006 19:21:26




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 Re: IH 806 LP Pistons in reply to superhooker, 01-01-2006 18:55:56  
I've heard this used in the pass to free stuck motors, take the motor outside your shop and dump a resonable amout of brake fluid in the bore on top of the piston and take a torch and set it on fire, it burns slow and warms the bore so it exspands and lets the brake fluid seep down around the piston watch the bottom when its wet it may be free to move.



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