Thread: 300Tdi engine oil leaks

Rear mains / T seals are common but I'd be giving it a good wash down & trying to trace the exact cause of the leaks before tackling that job.

Rocker cover gaskets + brake vacuum pumps are known to leak too.

Also - sump gasket as the 300 TDI's don't have a gasket as such, just use Silicone. Can be a bit tricky to get it right.

Also look at the oil breather coming out of the tappet cover (Above the fuel pump) there is a "o" ring that can be replaced.

I have also had to replace the gasket for the bracket that holds the oil filter. Watch the oil pipes in that area as well.

Cheers
Adrew

Ditto on what the fella's above have said.

With the vacuum pump I bodgied mine by epoxying the welsch plug and just silicon sealing the joint flange.

Inlet manifold gasket splits/cracks too, leading to a massive oil stain down the side of the block under the manifold from the oil blow-by that comes through from the oil seperator.

Oil cooler lines leak at the crimp.

I've had to do the sump twice too.

Originally Posted by Scouse

Rear mains / T seals are common but I'd be giving it a good wash down & trying to trace the exact cause of the leaks before tackling that job.

Rocker cover gaskets + brake vacuum pumps are known to leak too.

I did the rear main recently when I had the gearbox out. I've replaced the rocker cover gasket too. The brake vacuum pump is definitely a candidate.

Originally Posted by 86mud

Also - sump gasket as the 300 TDI's don't have a gasket as such, just use Silicone. Can be a bit tricky to get it right.

Also look at the oil breather coming out of the tappet cover (Above the fuel pump) there is a "o" ring that can be replaced.

I have also had to replace the gasket for the bracket that holds the oil filter. Watch the oil pipes in that area as well.

Cheers
Adrew

The sump doesn't leak. The previous owner took care of that. I've replaced the O ring in the oil breather fairly recently and it doesn't seem to be leaking, and the oil filter gasket looks alright too. The oil's mainly towards the rear of the engine.

Originally Posted by rick130

Ditto on what the fella's above have said.

With the vacuum pump I bodgied mine by epoxying the welsch plug and just silicon sealing the joint flange.

Inlet manifold gasket splits/cracks too, leading to a massive oil stain down the side of the block under the manifold from the oil blow-by that comes through from the oil seperator.

Oil cooler lines leak at the crimp.

I've had to do the sump twice too.

Thanks Rick. I'm thinking the vacuum pump is my main culprit but the inlet manifold gasket might be laking a bit too. I'll clean it all up tomorrow and go from there.

Have a good look at brake vacuum pump and oil cooler lines

O ring under the oil thermostate cover went in mine