BAZZ
Active Member
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Just a thought could it be anything to do with the grade of oil, been using fully synthetic 10w 40. Too thin or too hot and then forcing its way past the seel????
P38 Diesel
- Thread starter BAZZ
- Start date
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No.
Datatek
Well-Known Member
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I use 5W40, no problem.
BAZZ
Active Member
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Will look into that thanks for all the input, Bazz..
ragsyrandell
New Member
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Haven't been on here for a while, partly because my P38 has been going well (i've jinxed it now) and partly because i haven't got the knowledge of some of the senior members, BUT. I had exactly this problem and it caused me weeks of headaches. Finally i worked out that when i replaced my filter the big 'o' ring doesn't seal the the two surfaces (as i thought). It actually sits in a little recess just down from the surface. If that makes sense.
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This point has already been mentioned. The O'ring sits in a recess down from the top of the cap. But the OP says he is fitting the O'ring in the correct position. If that is so i don't see how it can leak, IF it is the correct O'ring.
Speedex750
Member
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- North East England
Bumping up this thread with more information.
I tempted fate too much saying my oil filter cap didn't leak. After the last oil and filter change it started to weep. I lifted the cap and fitted a new filter and seals. I found, as said further up the thread, that the O ring was distorted, there was also a couple of scratches in the groove where I or my predecesors had been clumsey getting the old O ring out with a sharp screwdriver. One side of the O ring was thicker and the opposite side visibly thinner. As threatened I measured everything up. The filter housing has a 100mm bore, the groove in the cap seems to be 92mm (verniers wouldn't quite go over the diameter) and the new O ring was 92mm ID and 4mm cord diameter. The old O ring was down to 3.5mm on the thin side and squashed to an oval shape on the thick side. The new O ring has done the trick, as tight as a nuns bottom again. For information the smaller O rings on the stalk are 6mm ID by 2mm chord diameter and 10mm ID by 2mm chord diameter.
I've never looked closely at the replacement O rings before fitting, I will now. I'm also getting some spare ones, they're available for pennies on the Bay of E.
So the moral is; the O rings in the filter boxes may not be fantastic, look closely before fitting and keep your old one till you know the new one is leak tight. They don't age very quickly and could be used again if you get a poor one.
This is all related to the 99MY later type, I don't know if the earlier filter had the same seals.
And I'm still using my chain wrench just above the joint, the hex hasn't got a top and the hollow hex looks very femmer.
I tempted fate too much saying my oil filter cap didn't leak. After the last oil and filter change it started to weep. I lifted the cap and fitted a new filter and seals. I found, as said further up the thread, that the O ring was distorted, there was also a couple of scratches in the groove where I or my predecesors had been clumsey getting the old O ring out with a sharp screwdriver. One side of the O ring was thicker and the opposite side visibly thinner. As threatened I measured everything up. The filter housing has a 100mm bore, the groove in the cap seems to be 92mm (verniers wouldn't quite go over the diameter) and the new O ring was 92mm ID and 4mm cord diameter. The old O ring was down to 3.5mm on the thin side and squashed to an oval shape on the thick side. The new O ring has done the trick, as tight as a nuns bottom again. For information the smaller O rings on the stalk are 6mm ID by 2mm chord diameter and 10mm ID by 2mm chord diameter.
I've never looked closely at the replacement O rings before fitting, I will now. I'm also getting some spare ones, they're available for pennies on the Bay of E.
So the moral is; the O rings in the filter boxes may not be fantastic, look closely before fitting and keep your old one till you know the new one is leak tight. They don't age very quickly and could be used again if you get a poor one.
This is all related to the 99MY later type, I don't know if the earlier filter had the same seals.
And I'm still using my chain wrench just above the joint, the hex hasn't got a top and the hollow hex looks very femmer.
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