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Subject: 8n oil overflows from oil filter housing

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Joe Bell    Posted 09-19-2019 at 16:47:07 [URL] [DELETE]        [Reply] [Email]  
  • 8n oil overflows from oil filter housing
  • Changed oil on 49 8n. Replaced oil filter. When restarted tractor, oil overflowed from housing that holds oil filter. Felt some crud in bottom of housing. Maybe overfilled, but donít think so. Any suggestions or guesses? Joe Bell

    Tim Daley(MI)    Posted 09-20-2019 at 06:32:14 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n oil overflows from oil filter housing
  • HiYa Joe-
    As Bruce and Jesse mentioned, if it isn't from an overfill or you failed to install the rubber flat gasket under the lid, then it's probably the 01A-6749 lid bolt seal has failed. The bolt seal is a fiber type material and works great. Twenty years ago when you bought a new FRAM C-3P or equivalent oil filter, you also got in the kit the large rubber flat gasket that goes under the lid and the 01A-6749 bolt lid gasket. Nowadays when you buy a new oil filter, even from CNH, you don't get that 01A-6749 bolt seal, and some don't even give you the large rubber flat gasket. I know the FRAM C-3 filter doesn't have the little handle on the top if filter to assist easier removal when you change the filter. The good news is the part is still made and sold at CNH -SEE PIX. Now some fellas may have had better luck than I using steel, copper, nylon, or plastic washers for the seal, but I never did -they always still leaked. About 16 years ago I bought a handful at my local CNH dealer and stocked up. Also good news is that first seal I bought is still on my 8N oil filter housing so they are reliable.


    Tim Daley(MI)

    Bruce (VA)    Posted 09-19-2019 at 17:14:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n oil overflows from oil filter housing
  • Overfilled? You didn't dump oil in there did you? That's not necessary. But even if you did, that's not causing the leak.

    It's leaking because of the gaskets, as Jesse said.

    Do not forget to use a quarter size gasket under the bolt holding the top of the oil filter canister. Just8Nís & CNH have them: p/n 01A6749. I have successfully used plastic & copper washers as well as homemade gaskets. Do not forget to use the 7/8Ē wrench to snugly tighten the bolt on the top of the canister. (Don't ask!). Most oil filters come w/ the large ring gasket; wet it w/ oil first. Save the old gasket until you check the canister for leaks. The new gaskets are sometimes thinner than the older ones & are prone to leakage. If yours leaks, re-install the old gasket. Put the new gasket into the groove in the filter cover. Make certain that there is not another one already in the groove. If the new gasket will not stay in position stick it in place with a little grease or gasket sealer. Make certain that the filter cover is properly positioned on the canister before tightening the top nut.

    Next time you change the oil, remove the canister and clean out the crud in the bottom.

    JMOR    Posted 09-19-2019 at 17:07:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n oil overflows from oil filter housing
  • both gaskets in place and in good condition?

    Joe.bell    Posted 09-19-2019 at 17:51:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n oil overflows from oil filter housing
  • Thanks. Am learning,! Joe Bell

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