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Engine Block

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Rob N Va

07-02-2003 13:50:49




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Just to satisify my curiosity (sp?) is there anyone out there that makes engine blocks for these old 8N's? I posted a while back about my high oil pressure, and the replies (thanks for the replies by the way!) led me to believe that too much oil pressure could damage the bearings. So now I am paranoid! I got to listening to the motor and there does seem to be a very faint knock comming from inside the engine. As of right now I can't really say for sure that it is a rod knock, because the main pulley is wobbling and it might be that causing the noise..I just can't tell right now. The problem is, I am not afraid to rebuild if I have to, but there is some "JB weld", or its equivelant, on the side of the block already and if something lets go in the near future, I am afraid I might have a block of swiss cheese! The patch is holding and barely noticable, but this whole thing concerns me. SOOOOO O, if the block goes south, does anyone know where to get an aftermarket one? As always, thank you for your comments and suggestions!!---Rob

P.S. My pressure is around 55-60 cold and between 30-40 warmed up, and the needle jiggles. What's up with that?? Oil Pump?

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steveB(wi)

07-03-2003 16:53:23




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 Re: Engine Block in reply to Rob N Va, 07-02-2003 13:50:49  
Try V A L U - B I L T not cheap but Available



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chuck

07-03-2003 07:11:56




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 Re: Engine Block in reply to Rob N Va, 07-02-2003 13:50:49  
Rob, My 51 N's block had been glued together too! Researching another problem when I pulled the head, three pieces of the back corner of the block fell off. Apparently when someone previously took the head off they didn't know about not prying it up. The locating pin back there just snapped the corner of the block off right through the rear exhaust port. My motor now has only bolts in the head so it will come off easy in 30-40 years. The back corner was glued together with some kind of epoxy. It ran for several years like that for me and if I had known what to look for I would have found it-didn't know and it didn't cause me problems. I went through the looking for a new block thing too. Amazingly, the FNH counter guy directed me to Brinkley Auto Machine in Forrest Heights, Md. (just outside the beltway around DC). This was an impressive shop specializing in the repair of heavy construction equipment and tractors. They didn't even blink at the shattered block. When I got it back it was all neatly welded up and the head and manifold mating surfaces machined smooth. They also rebuilt the rest of the motor and it has run perfectly with no oil or water leaks for 11 years now. This motor also lost a piston pin keeper that wedged between the piston and cylinder wall reeking havoc on both. My guess is that unless the motor grenades due to a high rpm disaster (unlikely in an 8N), this shop, or another of it's caliber, can salvage the block. I got the motor back fully assembled for $800 in '92-I paid for parts separately.

chuck
436244

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Rob

07-02-2003 15:36:45




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 Re: Engine Block in reply to Rob N Va, 07-02-2003 13:50:49  
Causes of High Pressure Reading, Consequence, Action

Pressure remains high after cold start. Oil flows adequately into the pump, but does not flow through the oil galleries Possible catastrophic failure Shut down engine. Use oil with better low temperature properties (5W-30 or 0W-30)

Oil is thickened by soot load Potential engine failure Change oil and filter. Check injector performance. Avoid excessive idling.

Oil is thickened by oxidation Potential engine failure Change oil and filter

Oil viscosity is too high. Oil flow is poor. Potential engine failure. Consult owners manual/oil supplier for correct viscosity grade. Change oil.

Filter blocked. By-pass valve allows unfiltered oil to circulate. Reduces engine life. Change filter and oil. Investigate cause of blockage.

Deposits in oil gallery system cause increased back pressure. Reduces engine life. Change oil and filter. Use higher quality oil.

Oil too cold. Potential engine failure. Check engine thermostat system. Check to ensure correct oil viscosity.

This is my note. You might start with running a soft copper wire down through the pressure relief valve port and down to clear that relief passage. If that reduces the pressure you know at least that one passage was plugged some.

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Bob

07-02-2003 15:04:53




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 Re: Engine Block in reply to Rob N Va, 07-02-2003 13:50:49  
Worrying about HIGH OIL PRESSURE (50-60 pounds or so) damaging your bearings is like worrying about LGM's landing in your back yard during your lifetime! 'Taint gonna happen! And with the pressure your cooling system operates at, if the epoxied patch is a good job at all, it aint gonna fail, either. The other day, I was helping a friend check his inboard boat motor (4 cylinder Chevy) for coolant leaks. We pressurized the cooling system to 75 PSIG, and couldn't find any evidence of the head gasket leak he was worried about. It was then we noticed the whole side of the block under the manifolds has been blown out by freezing, and epoxied back in by the previous owner. I was a HUGE repair, and withstood the 75 pound air! (I'm sure glad it didn't let go, though!) Some of these old tractor have run for DECADES with less than perfect block repairs!

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Rob

07-02-2003 14:32:10




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 Re: Engine Block in reply to Rob N Va, 07-02-2003 13:50:49  
You mention the jumpy gage and that's probably the oil pump. Maybe you can mess with the relief valve spring to bring that pressure down and the next thing on the list must be the oil pump. I think you increase the clearance in the end plate to reduce the oil pressure. Maybe someone didn't pay any attention when they assembled the pump. Maybe they had a pump problem and rigged it to pump. JB weld?
The block is pretty far down the list I would imagine.

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Lee

07-02-2003 14:20:13




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 Re: Engine Block in reply to Rob N Va, 07-02-2003 13:50:49  
Link
That link will give you a list of tractor salvage yards by state. I don't think you'll have any trouble locating a used block if you should need one. I think you're worrying unnecessarily though. If the pressure was too low that'd be a problem. Higher than normal, be happy ! As long as the pressure isn't causing major external leaks or problems just use that thing and don't let it bother you. I've never heard anything as silly as high oil pressure making bearings go bad. Don't buy that one.
Good Luck, Lee

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Rob N Va

07-02-2003 14:38:59




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 Re: Re: Engine Block in reply to Lee, 07-02-2003 14:20:13  
I thought it was silly too, but what do I know? that was my attitude. This is my first tractor, and the folks on this board have been into this kinda thing since before I was born. Good tip, thanks Lee!---Rob



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Rob

07-02-2003 14:55:55




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 Re: Re: Re: Engine Block in reply to Rob N Va, 07-02-2003 14:38:59  
You know...try a lighter weight oil. What are you using now?



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Lee

07-02-2003 14:47:12




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 Re: Re: Re: Engine Block in reply to Rob N Va, 07-02-2003 14:38:59  
You're welcome. Hope it helps.
Good Luck, Lee



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