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Time to rebuild my 8n?

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RBCanada

05-31-2005 17:22:55

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I've had this tractor for about ten years. Last year I bought a 6' Landpride finisher, works great but there is a lot of smoke coming out of the crankcase breather. Oil pressure is good at 20-25 psi hot and it uses very little oil running SAE 20-50. Compression testing shows #'s 4&3 at 70 psi #2 at 55 psi ant #1 at 75 psi. What can I expect if I rebuild the engine as far as the crankcase smoking under the mower's Load? Will a rebuild solve my problem, or is the mower too large for this tractor? thks.

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Dell (WA)

05-31-2005 19:00:40

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Re: Time to rebuild my 8n? in reply to RBCanada, 05-31-2005 17:22:55

RB..... ..70psi compression don't meet the N-Ford specs of 90psi min (dry). But before you gitt excited, be certain you did yer compressing checks correctly. Takes a minimum of 5-puffs before the slow turning starter has cranked the engine enuff. I usually crank until the gauge stops increasing. Writer down. Then squirt about 1-oz (teaspoonfull) of oil down the sparkie hole and do yer compression test again. This is called a "WET" reading. Compression should increase because the oil is sealing the compression rings. Normal used engine will increase compression about +20psi. NO increase, burned exhaust valve. Well worn engine compression will increase +30 to +40psi and is a candidate for new rings/overhaul.

But yer 25psi hot oilpressure DOES NOT SUPPORT the well worn engine syndrome.

You may have "stuck-rings" and need some MMO treatment. Thats $5 or $10 well spent even if the rings are not stuck; read the instructions.

Yer 8N should handilly handle a 6ft finishing mower. Iff'n yer having insufficent power problems, mow more often ...or... just mow 4ft wide instead of 6ft wide (ie...overlap) Simple, eh?..... ...respectfully, Dell

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jiminoystercreek

05-31-2005 17:32:12

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Re: Time to rebuild my 8n? in reply to RBCanada, 05-31-2005 17:22:55

Couple of things you might want to check before you tear it all down. The oil pressure sounds good, so if the gage is accurate (cause 20-25 HOT oil presuure a braggin rights!), your tractor doesn't indicate bearing issues. If that's the case, try a wet compression check to see if its rings or if you can narrow it down to valves. \

Low compression may be the only problem you have and that's not indicative of a rebuild in and of itself.

What is the mower manufacturer's horsepower recommendation for the mower? If it requires a minimum HP greater than about 23-25 you may have too much load on the old N and you may have to go down to a 5' mower.

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