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Joined: Jan 16 2017
Posts: 416

Slightly off topic for here, but got to be worth a shot!

Been looking at an overheating/over-pressuring TD5 engine on a 1999 Disco - It seems to be putting oil into the coolant, but not the other way round. Was initially suspected to be the head gasket, but it appears the td5 has an oil cooler mounted on the side of the block that has 2 o rings that over time stop sealing effectively, this allows the oil to seep out into the coolant.

Trouble is, I can't seem to find a part number or size for these o rings - Microcat doesn't show them as a seperate part, I've arrowed the ones in question in the attached screenshot.

Anyone know of either a specification for them, or a part number? The one labelled 8 is ERR7098, but this only shows a qty of 1, suggesting its not that?

enter image description here

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Joined: Mar 22 2016
Posts: 1056

I’ve had the same thing happen on a pug 405td many years ago, I would say your in the right ballpark for sure, as for it being the Orings it’s possible, on mine it was the cooler itself.
Hardest thing is getting the oil out of the cooling system, run some gunk ect through it, I also put a dishwasher tablet in the system, was a hell of a job, test the cooler before you do anything, a lot of work otherwise.
PBC 500230 is the oil cooler repair kit, it looks like island4x4 do it, new cooler, gaskets and O rings. £125.
Hmmm sounds like it will be the cooler itself !

Member
Joined: Jan 16 2017
Posts: 416

no10chris wrote:

I’ve had the same thing happen on a pug 405td many years ago, I would say your in the right ballpark for sure, as for it being the Orings it’s possible, on mine it was the cooler itself.
Hardest thing is getting the oil out of the cooling system, run some gunk ect through it, I also put a dishwasher tablet in the system, was a hell of a job, test the cooler before you do anything, a lot of work otherwise.
PBC 500230 is the oil cooler repair kit, it looks like island4x4 do it, new cooler, gaskets and O rings. £125.
Hmmm sounds like it will be the cooler itself !

I'd found one at around £65, but have a suspicion its a Britpart one so avoiding that as it either won't fit, won't work or will be missing vital bits.

Its had a new radiator as the old one was full of radweld where someone had been trying to fix the water leak (which was actually the water pump we found once putting a pressure test kit on it - once that leak was sorted and the other dodgy looking pipes replaced, it then blew the top hose apart.

Dishwasher tablet idea sounds like a useful one to have in mind once we stop the oil getting in there, Cheers.

Member
Joined: Mar 22 2016
Posts: 1056

I know what you mean about britpart, as I try to avoid as well, although I m more towards anything electronic, surely even they can’t f@#* up a rad, lol

Member
Joined: Jan 16 2017
Posts: 416

I've seen them make a poor job of a machine screw! Pack of 10 and at least 4 of them had heads with the slot nowhere near the centre. Does explain why the local indie that gets occasional parts for my mate with his Series III only does full packs of small stuff, its usually blue bags for all of it, so need a full pack to get enough usable ones.