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Farmall & IHC Tractors Discussion Forum
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Oil metering hole in letter series

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Lou in Idaho

05-31-2005 20:44:57




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I was wondering, is it very common for the oil metering hole in the oil filter case retaining bolt to get clogged up? I drained the oil and pulled out the old filter on the Super C I'm restoring and tried blowing through the hole in the bolt. No air came thru and I tried compressed air and still nothing. Finally, with a wire I got the hole clear, whatever was plugging up the hole was very hard and crunchy, never did find any of the pieces of it. I cant figure where whatever it was came from since the oil flowing through the hole should be clean filtered oil.

Is the purpose of the metering hole to restrict the oil flow to keep the oil pressure from dropping excessivly?

Thanks for any thoughts on this.

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Slappy

06-01-2005 03:54:54




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 Re: Oil metering hole in letter series in reply to Lou in Idaho, 05-31-2005 20:44:57  
Wow, Lou sounds like you had some junk in there alright. As I understand it, the metering hole has to be open and clear or oil won't pass through the filter. On the H and A, and perhaps all letter series IH tractors, the oil filter system is a by-pass system. So a plugged filter won't stop oil from getting to other engine parts.

Nevertheless, you might want to make sure you don't have a lot of trash in your engine. Maybe some frequent oil changes and cleaning out places you can reach eaisly will be needed. Some people have suggested that a sudden switch from non-detergent to detergent oil can cause a sudden loosening of crud that may plug oil passages. There is a lot on this topic in the archives.

In the meanwhile, there is no down side to keeping your metering hole clean.

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