Can oil leak from sump to bell housing? 300tdi

**Corgie Carrier** · 14th September 2015, 05:32 PM

I have recently had the clutch changed and a new rear main seal at the same time. Car is a 96 Disco 300tdi & R380 box.

Now I have oil in the bell housing.

I took it back to the mechanic that did the job and he can see oil seeping or leaking out the back of the sump gasket.
Can this oil leak into the bell housing or is the only way oil gets in there because of a leaking rear main seal.

He wants me to pay him to re seal the sump to eliminate that as a cause. He quoted about 2 hours work for the sump re seal, is that reasonable?

Anyone have a pic of the rear of a 300tdi? So I can see what it looks like in there

Thanks in advance

**jboot51** · 14th September 2015, 06:16 PM

A leaking sump would leak oil down the outside of the gearbox adapter plate, not into the bell housing.

Have a look here. There are a few pics.
https://www.landyzone.co.uk/land-rov...how-to.190217/

The sump is about 8mm lower than the opening in the gearbox adapter.

Land Rover Workshop Manuals > 300Tdi Defender > ENGINE > CRANKSHAFT REAR OIL SEAL

Land Rover Owner • View topic - Crankshaft oil seal replacement, help please.

**loanrangie** · 14th September 2015, 06:19 PM

What about the T seals, they would leak past the rear main and into the bell housing.

**jboot51** · 14th September 2015, 06:45 PM

T seals are mostly behind the rear main, apart from the 8mm or so that hangs below.
Even this 8mm is covered by the adapter plate.

I only have a 50% success rate with rear mains.

**Corgie Carrier** · 14th September 2015, 07:31 PM

Thanks Jboot51.
Your pics show that the rear seal comes in the housing... I am sure all I got was the round seal to be fitted to the housing.
Could this be why it failed?

Those pics also make it clear that the sump is not the cause, I will send them to my mechanic.

**jboot51** · 14th September 2015, 07:37 PM

the rear seal and housing are one unit.

https://www.google.com.au/search?q=3...DbQyd&dpr=1.25

**Blknight.aus** · 14th September 2015, 08:33 PM

yep, on non pedantic do just enough rear main replacements 50/50 is optimistic but realistic.

full pedantic replacements with no expense spared and I've got a 100% success rate with no failures reported inside 100K Km... I also tend to call that level of workmanship "full engine rebuild"

**Corgie Carrier** · 15th September 2015, 05:34 AM

Does anyone have the part number for the seal handy?

Thanks for the info so far

**Leo109** · 15th September 2015, 07:16 AM

Originally Posted by Blknight.aus

yep, on non pedantic do just enough rear main replacements 50/50 is optimistic but realistic.

full pedantic replacements with no expense spared and I've got a 100% success rate with no failures reported inside 100K Km... I also tend to call that level of workmanship "full engine rebuild"

Hi Dave,

50/50 seems a poor result from (for me) such a big job.

So why are " just enough rear main replacements" so unsuccessful, if it's been done carefully (cleanly) and by the book? Is it due to wear on the crankshaft seal surface that can only be fixed by a "full engine rebuild".

**jboot51** · 15th September 2015, 07:37 AM

LUF100430 is the part number

The last one I changed, I had to enlarge the bolt holes in the housing as there was tension on the seal pulling it ever so slightly in one direction.
This meant the seal went on,off,on.
not good for the seal surface I imagine as it is delicate.

Thread: Can oil leak from sump to bell housing? 300tdi

Thread Tools

Can oil leak from sump to bell housing? 300tdi

Bookmarks

Bookmarks

Posting Permissions