Oil Cap Question (05/06 SD)

Hi Guys

I've got a vintage 05/06 SD (yer.. i'm a member of the old guard . The oil cap on it has always leaked. This is something I have always put up with. Over the years, it has got worse and worse. Now, I want to do something about it. I was wondering if the oil cap is meant to do this (ie: Does it act like a relief valve ?).

I noticed that the oil cap has a seal on it, so that tells me it is not meant to leak. The lubrication system has a pressure relief unit (See Diagram Reference 5, Page 2-2, 2003-2005 Repair Manual 3.206.025-E). So it appears the engine does have pressure relief mechanism.

To fault the problem, I am going to fit a temporary seal. This seal will plug the oil cap's leakage. However, I want to first check with some of you mechanical gurus that the oil cap is not meant to act like a relief valve, as I don't want to make an assumption and then damage my engine. Note: If the oil cap is not meant to leak and I can then go ahead and confirm fault, and then order a new oil cap (or oil cap seal).

Any advice/opinions is appreciated

Cheers J

My 06 has never leaked and i'm sure they're not meant to.

It's not a relief valve and mine (too) regularly needs a new o-ring to stop oil weep.

The seals on the cap are crap, just replace and forget it!

My 06 is leaky too. Are the new seals redesigned to actually work? I believe the water pump is the same, replace with new and it should last much longer than the original.

Get new "O" ring,,,oil's never supposed to leak replaced mine with a Zeta unit w/dipstick,,,gonna remove the site tube alltogether as well,,one less leaky link,,,,

Ok. Thanks guys. J

Fixed. Thanks again.

J