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John Deere Tractors Discussion Forum
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Re: Pitting in o-ring groove in JD 6-404 engine block - Options

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mike m

04-05-2014 11:04:53

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Those that use the JB method why not just put it in there and assemble it quick ???

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04-06-2014 07:38:47

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 Re: Pitting in o-ring groove in JD 6-404 engine block - Opti in reply to mike m, 04-05-2014 11:04:53  
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The idea of the JB Weld is not to glue the o-rings in, but to smooth the ramp so the pits in the ramp do not cut the o-rings. If you put the sleeves in before the JB Weld is hardened, you still risk cutting the o-rings. Let it harden, then sand it down to match the profile of the ramp. Cleanliness is key to a good bond, but usually the pits don't go below the line where the o-ring seals. In the rare case where that occurs the JB Weld needs to stay in place, but mostly it just needs to stay long enough to get the o-rings in place. In all the years I repaired blocks with this method, I never had a coolant leak. YMMV. Machining out the old ramp and pressing in a new ramp still leaves the possibility of a leak between the block and the new pressed in ramp (although very rare, I'm sure). So I guess it boils down to how much you want to spend.


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04-08-2014 10:10:44

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 Re: Pitting in o-ring groove in JD 6-404 engine block - Opti in reply to jd2cylman, 04-06-2014 07:38:47  
The "worst" looking hole has a place where the "pit" is more of a "chip" where the o-ring seat has eroded away to where the next lower o-ring groove is. I'm not sure how to make the JB or other epoxy "stay" in place until it hardens. Please see the picture of this spot below. I've also copied a page out of the John Deere factory repair manual & edited it to show where the eroded portion is.



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04-08-2014 19:56:20

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 Re: Pitting in o-ring groove in JD 6-404 engine block - Opti in reply to RedBarnNate, 04-08-2014 10:10:44  
I would clean that puppy with a wire wheel, then carefully clean even more with muriatic acid (don't breath the fumes!), then sand well and clean again. Apply JB weld to the spots. Let harden. Sand to match the profile and Bob's your uncle! Install sleeves and go. Just my opinion.

Good luck!


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Tim S

04-06-2014 08:14:18

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 Re: Pitting in o-ring groove in JD 6-404 engine block - Opti in reply to jd2cylman, 04-06-2014 07:38:47  
Yes, I can see this idea working,, though I have never tried it or needed to (Knock on wood),, and I have never heard of doing it the way Kent suggested,,and his way sounds good,,and at $100 a hole it is economical too, you can soon get a couple hours into repairing one with the J-B weld method,,and time is money.. I don"t know if any machine shops around here offer that kind of repair,,but I"m going to inquire about it so I will know,,I am also looking for a shop that can turn my 6 cylinder cranks for me,, my old shop called it quits and retired last year,,Darn it..

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