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  #1  
Old 07-15-2006, 02:51 PM
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oil filter gasket??

hi

Did my first oil change on a 84 300TD. the oil filter housing has a large o-ring to seal the lid.

This o-ring does not fit tight in the groove is this normal or is this the wrong o-ring?

Thanks
Tom

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Old 07-15-2006, 03:27 PM
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If it came with the long filter with the wire handle, you have the correct O ring...and no, it does not seem to fit that well, but, it should slide over the lid into the groove without any problem.....did you change the O rings at the bottom of the lid tube too ?



.
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Old 07-15-2006, 03:34 PM
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no I did not replace those o-ring . however they looked ok and where soft. Should I replace them with every oil change the be safe?
thanks
Tom
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Old 07-15-2006, 03:36 PM
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I had to hold the o-ring in the groove with my finger tips as I was installing the lid.
Does it fit that loose?

Thanks Tom
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Old 07-15-2006, 05:25 PM
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not meaning to hijack a thread but I had never noticed the o-rings at the bottom of the oil filter. Until I saw it here . My question is what do these do? I can't remeber if my canister has these, I don't remeber seeing them. What would not having them do?
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Old 07-15-2006, 06:18 PM
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The Rings of O

My FSM engine diagrams (section 18.8, pages 005/4 and 005/5) show the o-rings but don't specifically describe their purpose. You are no doubt aware that the oil filter has two sections and the oil goes either to the bearings and other points of use or back to the pan, depending on which section it goes through. Additionally, some of the oil flows to the oil cooler first, depending on oil temperature and the thermostat inside the filter housing. Some of the oil flows through the upper part of the filter and then down the tube shown in your picture (with the o-rings -- it is called a "return flow pipe") and returns to the oil pan. Some of the oil flows through the lower section of the filter and then down the "riser," a pipe that fits around the "return flow pipe" and so to the bearings and such.

Because of the above, the oil filter housing is a complicated beastie and I'm not sure what goes where just from looking at a diagram on paper. I would hazard a guess that the o-rings keep the oil from going somewhere it isn't supposed to go. That's a rather dumb statement but it is the best I can do.

Bottom line, the o-rings need to be there and they need to be soft, not hardened with heat and age, so they will seal whatever it is they are supposed to seal.

One of these days I'll have to check mine.....

Jeremy
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Old 07-15-2006, 06:35 PM
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The large O-ring for the filter lid does not necessarily have to fill the slot that it goes in. It should be thick enough, however, that it seals when the cover is snugged down. Don't over-torque the hold-down nuts. All they need to do is bring the lid down snug onto the filter housing.
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Old 07-15-2006, 09:04 PM
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Quote:
Originally Posted by olmar
I had to hold the o-ring in the groove with my finger tips as I was installing the lid.
Does it fit that loose?

Thanks Tom
Some times.....although a little grease will hold them.

The lower O rings stop oil short circuiting the filter and causing low hot idle oil pressure.

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