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jonny

Member Since: 10 Mar 2013
Location: North Wilts
Posts: 231

TD5 - Oil Leak from Inlet side

Hi

My TD5 has started marking it's territory - oil is dripping from the bottom of the gearbox bell housing / block join if it's left for a while...

Looking underneath, I can't see anywhere obvious it's coming from - it looks like there's oil residue underneath the engine mount, and high up on the block, above the base of the dipstick tube, but it's hard to see clearly with the inlet and all of the gubbins in the way. It's definitely oil as it's dirty black, not diesel.

Is there a 'usual suspect' round there that can leak?

Thanks!

28th Sep 2025 12:21pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 6015

2006 Defender 110 Td5 USW Zermatt Silver

Check your fuel pressure regulator. They often leak and then run around the back of the engine washing oil off and becoming black with clutch dust.

28th Sep 2025 12:40pm

jonny

Member Since: 10 Mar 2013
Location: North Wilts
Posts: 231

Thanks - had a feel round there, and the FPR itself is dry - no leaks from the unions etc and no diesel-smelling fluids.

However, on the underside of it, where it's bolted to the block, and under the inlet runners of 4 / 5 there's oil - not a massive amount, but enough to make your fingers dirty...

28th Sep 2025 1:17pm

Hazza

Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 242

Mine used to leak on the inlet side - check that it isn't the alternator/vacuum pump join. There's a seal between the two which can fail, especially (as in my case) if the bearing on the back of the alternator has failed and the vacuum pump is doing the heavy lifting as a result. 1990 Defender 110 200TDI Camper - now converted to Td5 power

28th Sep 2025 1:45pm

jonny

Member Since: 10 Mar 2013
Location: North Wilts
Posts: 231

Thanks - I had a feel round there and it all seems to be dry...

28th Sep 2025 4:08pm

Mike c

Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 948

Rocker cover gasket or dreaded rear main seal? 2004 Defender 90 Td5 CSW
2002 Discovery 2 td5 GS (gone)
1994 Defender 90 300Tdi CSW (gone)

28th Sep 2025 4:26pm

jonny

Member Since: 10 Mar 2013
Location: North Wilts
Posts: 231

The rocker cover gasket doesn't appear to be leaking much at all - however I need to do the injector loom at some point, so I've got a new gasket, cam plug thing and O ring on the way anyway..

Hopefully it's not the rear main seal!!

28th Sep 2025 4:41pm

DefenderCan

Member Since: 25 Nov 2023
Location: Canada
Posts: 39

Rear main seal

29th Sep 2025 2:16am

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