Gearbox leak - rear main seal

[ChrisBy]

Hi all,

Looks like I’ll be pulling off my gear box for a rear main seal replacement.

I was just wondering if anyone could please advise me of any other maintenance jobs I should do, concerning an FFR 1990 Perentie, approx 90k kms, whilst I have the gearbox out.

Cheers
Chris

[JDNSW]

Are you sure it is engine oil leaking? In any case, while the box is out, check carefully that the oil pump cover on the front of the gearbox is not leaking. These tend to warp and leak oil into the clutch housing. (You could have a mixture of engine and gearbox oil - i.e. could be both leaking.)

[Bearman]

Is it the engine rear main seal or the gearbox rear main seal you are talking about.

[JDNSW]

I assumed it was the engine rear seal, since there is no need to take out the gearbox to replace the gearbox rear seal.

[Bearman]

I assumed it was the engine rear seal, since there is no need to take out the gearbox to replace the gearbox rear seal.

Just looking at the title which says "gearbox leak"

[101RRS]

I was going to comment but I see the gurus have it all covered.

Just a side comment - did the LT95s in the Perenties have the fibre oil pump impellers or the updated metal one? If the old one then something to look at when the gearbox and engine seperated - also as mentioned a good time to reseal the oil pump cover.

I did mine in my 101 a while back (thanks Bearman for the advice etc).

Garry

[Bearman]

Thanks Garry - a lot of them would still have the original fibre oil pump gears. Ones that have been recoed should have been upgraded with the metal one but I have seen some that weren't. Good idea to check it and the input shaft seal at the same time.

[123rover50]

MMMM Maybe I should check mine too.
Just in the process of removing the Isuzu bell housing from the LT95A and replacing it with the Rangerover one to stick in my FC.

[123rover50]

Just pulled the oil pump cover off the LT95A. Its got the fibre gears.
Where do I buy the steel replacements from?
For interest it is box number 29c 07143 but looks as if the original number has been ground off and restamped.

Keith

[101RRS]

If the correct oil is used and the box has not failed so bits of metal go through the pump the old fibre gear works fine - mine was 40 years old and still in great condition when I replaced it - simply because the gearbox was out.

So not in itself something to pull the gearbox but if it is out something to consider.

Garry

[123rover50]

Thanks Garry. The box is out so just looking.
Just PM Mario and he can only get the fibre gears.
I pulled the cover off another LT95A and its pump has a fibre gear and ring with a steel shaft.
The previous one was a one piece fibre shaft and gear.

[Bearman]

Use the one with the steel shaft Keith. That is the weak point on the fibre ones.

[123rover50]

Thanks Brian but I bit the bullet and bought a new all steel set from M&R.
They recommended to fit a new gasket but have to buy a complete G,box gasket set to get it.
Thats OK.

Keith

[Bearman]

Thanks Brian but I bit the bullet and bought a new all steel set from M&R.
They recommended to fit a new gasket but have to buy a complete G,box gasket set to get it.
Thats OK.

Keith

I could have brought one down at the weekend. I will buy the rest of the gasket kit if you are not going to use it.

[JDNSW]

I made a gasket!

[weeds]

It’d be just a paper gasket?

A Manila folder

[JDNSW]

Yes. I have a supply of gasket material, but I don't remember what I actually used.

[123rover50]

I could have brought one down at the weekend. I will buy the rest of the gasket kit if you are not going to use it.

Its OK, I will probably use it eventually.
Bought from M&R Monday, here today[smilebigeye]
Sent you a PM.
Got some Perentie cab trim and troop carrier long seat pads to get rid of.
Will bring a bottom PTO as well.

Keith

[123rover50]

It’d be just a paper gasket?

A Manila folder

Yes, thats about the thickness. Thats probably critical, too thick and lose pressure, too thin and the rotor binds and breaks.

[123rover50]

Thanks Brian but I bit the bullet and bought a new all steel set from M&R.
They recommended to fit a new gasket but have to buy a complete G,box gasket set to get it.
Thats OK.

Keith

Just for info, the all steel pump gears are not a direct swap for the fibre ones. The steel inner drive gear has a dome that sits proud and above the surface so the original cover plate wont bolt up.

[Bearman]

Haven't struck that problem yet Keith. What brand.

[123rover50]

Its in a green bag. EAC parts England.
M&R are looking into it. Warren thought it must be a misspacked LT85 one but looked at his stock and they are the same. its labeled STC3861.
Gear Kit LT95 OEM
K0017694.
Might have to turn the hump off but then the end of the shaft would be exposed. Might get pressure loss but not much I guess.