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JD 820 Diesel

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Lyn Jones

01-12-2003 11:15:10




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My black dash 820 is a little hard to start due to a leaky exhaust valve. I took the head off today, and have decided to replace the rings as the engine breathes a bit heavy. The pistons are marked with part no AR1825R. Does this mean that they are of the standard bore? There were no other markings on the pistons other than the word 'top'
Thanks.




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Clooney

01-12-2003 11:54:29




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 Re: JD 820 Diesel in reply to Lyn Jones, 01-12-2003 11:15:10  
Lyn, you really should measure the pistons & bore size. I believe those AR1825R piston assemblies are standard pistons for the S/N 8203100 up...



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Lyn Jones

01-12-2003 13:49:35




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 Re: Re: JD 820 Diesel in reply to Clooney, 01-12-2003 11:54:29  
Thanks for that Clooney. I think I will take the pistons out and measure things properly. Would you recomend the use of oversize rings if there is a little wear in the bores? I don't think there is enough wear to warrant a rebore. I need to take off the pony motor anyway as I'm getting a lot of oil leaking out from under the engine. That may be due to the ring blowby pressurising the crankcase.
Regards from Wales.

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Clooney

01-12-2003 14:05:16




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 Re: Re: Re: JD 820 Diesel in reply to Lyn Jones, 01-12-2003 13:49:35  
Lyn, you probably can't use oversize rings, the rings MUST be fitted to the tightest point in the bore [usually the bottom of the bore] & the bottom of the bore wears very little. If you try to fit the rings to the loose spot they will jamb & break when they travel into the tight spot.....



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