turbo troubles in my 940 have afew years
 

anyone info on how to stop turbo return leaking from pipe into block. ive got 3 940ms and they all leak after you replace them any ideas please?

fit a new seal. They are gravity fed, so no pressure to force oil out, but it will seep if the old seal is reused.

turbo troubles on 940
 

anyine any ideas on how to stop oil return from turbo leaking when replaced model is a 97 celebration 2.3 would appreciate any help as car off road thnaks very much craw,:confused_smile:

What Ash said ! ^^^^^^

After two new seals - proper volvo ones - and a whole bunch of silicon sealant I gave up and purchased one of these:

https://yoshifab.com/store/turbo-red...rsion-kit.html

That, a 8an turbo chra drain and a custom made pipe (£28 from a hydraulic specialist using the hard pipe as a template) and the problem went away forever.

Bonus is turbo removal is also a whole bunch easier.

If your car is off the road anyway I would seriously consider this.

(Oh, and if you are removing the turbo anyway i'd also do the seals for the oil cooler - they are not expensive from volvo and a doddle to change, plus removing the oil cooler makes the bung a whole lot easier to fit.

My 2c

PP

If done correctly it should not leak. Its a very simple low pressure seal. It is however easily damaged.

Put the seal on the pipe and then assemble into the block, not the other way around, otherwise you will likely damage the seal with the edge of the pipe.

Do not ever try to keep the pipe attached to the turbo + manifold and reassemble as a job lot, you will damage the seal.

Either that or you have some old seal, sealant, dirt etc in there.

You also need to ensure the PVC is working correctly, as the vacuum keeps the oil in. Lossen the oil cap and lift it gentle with finger tips and see if you can detect a slight pull on the cap when its close to closed.

If you run extra boost on the track with high rpms you really need a one-way check valve in the big inlet feed pipe as the pressure dump on throttle close will pressurise the block briefly pushing oil out of all the block seals.

Mine doesn't leak and as far as I can tell it's the original and pretty warped, I even left the return pipe on the turbo when reassembling several times. The pipe inserts into the block so it shouldn't leak back too much anyway.

I've been looking at the yoshifab insert weighing up whether to make one myself on my lathe or to buy it. It doesn't look too hard to make but it'd be fairly time consuming to get the dimensions correct so it's a good fit. It'd certainly make any jobs involving the turbo a lot easier.