Oil pump leak

[Dalamar]

I have a slow leak from one of the two ports on the oil pump shown in this picture from my 95 Chimaera. The oil filter isn't shown but is located to the right of these holes lower down.



Can you please confirm that the upper one is the oil pressure relief valve and the slightly lower one to the right is just a blanking plug? The plug being the same size as the oil pressure switch.

I'd just like to confirm before I start undoing things. As you can see I've cleaned up the area so that I can see which port leaks first but which is the favourite to leak on these cars?

If I'm going to address a leak on the oil pressure relief valve is it best to buy a kit to fix or just change the o-ring?

[Sardonicus]

The cap with the circlip is the PRV and the hex bung below is a left over oil cooler port from the Range Rover both are sealed with O rings , removing and refitting the PRV cap in situ is a PITA however looking at the pic looks unlikely to be the culprit whats far more likely is a failing oil pressure lamp switch

Edited by Sardonicus on Monday 30th September 10:31

[Dalamar]

I’ve changed the oil pressure switch further up the block earlier this year and got it nice and dry. Still dry when I checked last night. As far as I can tell it’s somewhere around this region.

[Adrian@]

A thought here, I have had the brass version, male/female adapter from the oil pump body to the sender crack, weep/leak and then shear (as the OE item is a converted part) which I replaced with a steel item from TVR Power. A@

[Sardonicus]

Adrian@ said:

A thought here, I have had the brass version, male/female adapter from the oil pump body to the sender crack, weep/leak and then shear (as the OE item is a converted part) which I replaced with a steel item from TVR Power. A@

Serp motor Adrian so oil light sender straight into front cover (no adapter) gauge sender behind front crank pulley

[Adrian@]

Ah...OK . A@

[Dalamar]

I was doing some wishbone painting in that area last night and spotted that the pressure relief valve was wet after I'd given it a wipe the night before.

I gave the cap a prod with a screwdriver and surprisingly it moved quite easily. It actually moved with little effort with my index finger and I could see that oil was starting to leak past when I moved it in and out. So that I presume is the culprit!

Question is - how firm should the cap be on the spring? Is it quite a strong spring? I understand the spring should hold off 50 psi oil pressure. So as a minimum I need a new BS017 Viton o-ring for the cap but should I change anything else or go for a full refurb kit?

[Sardonicus]

Now you've disturbed it you wont have much choice IMO just change the o'ring, but pushing the cap whilst engaging the circlip is the tricky bit in situ as always clean clean clean working

[lancepar]

There is plenty in these pages common to the serp and pre-serp engines, might be of use.

http://www.super7thheaven.co.uk/wp-content/uploads...

[Dalamar]

Thanks, that link was really helpful especially about the uncompressed spring length in the relief valve.

Does anyone know if the spring is the same between the Serp and pre-Serp engines? The Land Rover part number is 602067.

[Sardonicus]

Dalamar said:

Thanks, that link was really helpful especially about the uncompressed spring length in the relief valve.

Does anyone know if the spring is the same between the Serp and pre-Serp engines? The Land Rover part number is 602067.

No, but they are available , I have yet to see one that was out of spec for a serp however not seen a failure either but thats a very rare occurrence on any engine