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8N Teardown questions

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simonmeridew

11-03-2002 08:43:01




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My Fall project will be to rebuild the motor on my 8N, burns oil bigtime and oil in radiator etc. I like to know as much as possible what to look for before I start tearing it apart, to minimize downtime, so...
It was rebuilt 25 years ago, so now how do I tell what oversize bearings were put in when it was first rebuilt? Do I measure the crank journals and compare with the specs?
How many rings and what sleeves are in my motor, assuming not rebored and different sleeve type fitted? Motor number 388036.
Can I measure the sleeve thickness from the head side of the block or is there a rim?
Every question seems to lead to another one. Thanks for any replies
simonmeridew

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Rich NJ

11-04-2002 07:28:41




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 Re: 8N Teardown questions in reply to simonmeridew, 11-03-2002 08:43:01  
The bearings will be stamped on the back, but that's no real subsitute for measuring. You'll need a 2"- 3" micrometer. Measure. A several points around the journal. Not in one place. This is to determine any out of roundness. I'm not sure if I understood the part about the Cylinder size. Cylinders "Types" are indicated by a symbol in front of the serial Number on the block. A Diamond shape is the later,heavier, Cast Iron cylinder. The earlier cylinders were .040 and made of steel. This is not the Bore size, but the thickness of the Cyl. Walls. Hope this helps. Don't forget to check the gaps at the ends of the rings. It should be .010-.017" stagger the ring gaps as you .... ah you know. Regards, Rich

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Jim Spencer

11-03-2002 18:20:52




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 Re: 8N Teardown questions in reply to simonmeridew, 11-03-2002 08:43:01  
Listen to Dell;
I rebuilt an 8N engine and there is no way to tell until you get it apart. You will have to Measure (Micrometer) the crank, and I would never try to replace the bearings without regrinding the crank(about $50-- near here. After regrinding they will tell you what size bearings you need. The sleeves will need to be replaced and what size you have in it now will determine what you will need. There are about 3 standard sizes that were used. The sleeves will determine the piston size you need. You should also ensure the oil pump is in top shape because this is as important to the engine as your heart is to your body. All these parts are readily available and will cost probably close to $450--, but when you get done you will have an engine that will outlast you.

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simonmeridew

11-03-2002 13:22:38




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 Re: 8N Teardown questions in reply to simonmeridew, 11-03-2002 08:43:01  
I like seeing numbers on parts I teardown; any information you get will be a help. I put a new oil pump in about 5 years ago and oil pressure continues to be good though I get an occasional rap when the tractor bogs just short of stalling. Don't know what this is I guess I'll find out. We're in between seasons in northern Vermont, deer season doesn't start for 2 weeks and I'd like the tractor start to finish in time to spend some quality time in a treestand. simonmeridew

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Levi(WA)

11-03-2002 10:54:31




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 Re: 8N Teardown questions in reply to simonmeridew, 11-03-2002 08:43:01  
You should be able to get a rough idea by looking at the backs of the bearings they should be stamped with their size. Measuring will be the only way to be exact



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Dell (WA)

11-03-2002 08:51:58




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 Re: 8N Teardown questions in reply to simonmeridew, 11-03-2002 08:43:01  
Simmon..... ..all very legitimate questions to which the only answer is: "tear it appart and measure it". Sorry..... .Dell



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