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V70 T5 oil leak

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Old Mar 26th, 2020, 20:32   #1
taiwan740
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Default V70 T5 oil leak

Best of evenings to you on this fine locked-down day,

My latest edition to Club 400 is a 1998 Volvo V70 T5 Automagic.

It has quite a bad oil leak. The whole of the underneath is wet, as is some splattering on the rear bootlid. Spectacular!

I took a look-sie with my peepers and its spraying all up the back of the block, but no seepage from the front crankshaft or any of the camshaft seals. I thought rear main seal initially, but from the angle and the spread on the oil ejection, my hippopethisuses is that a very fine spray of oil is coming from some kind of turbo seal, or perhaps a hole in a pressuried oil line coming to/from turbo.

When idling, there doesn't seem to be noticeable leakage, so I'm guessing it is a small leak that gets worse with oil pressure.

Is this hypothesis remotely possible? And if so, do these symptoms therefore eliminate a rear main seal issue, or am I just an idiot?

Of course, as this is the internet, I'm not going to provide any pictures. That would be too helpful (car is out of reach)
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Old Mar 26th, 2020, 21:53   #2
Luxobarge
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Oil feed to the turbo is a favourite, it's an O ring. I'm sure you know this, but you're going to need to break out the Gunk or paraffin etc. and clean it all down, then get under there with it running and see where it's coming from.

Another suggestion is camshaft seal - this went on mine, and it's amazing where the oil managed to get to. A bit easier to work out that one though, and an easy enough fix.
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Old Mar 27th, 2020, 10:20   #3
turboboy
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Default Oil leak

As Luxobarge says there is an "O" ring which can cause leaks, but also at the other end of the pipe is a gasket which you should change at the same time.

You have to take the pipe off anyway to change the "O" ring so it is sensible to do both. I believe the gasket is on the upper end of the oil return pipe where it is attached to the turbo under a bolted flange, held by two screws with internal splines but cannot remember the size.

I bought both the "O" ring and gasket intending to do the job myself but in the end got a local garage to do the job.
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Previous: 2000 Volvo V40 T4; 1981/2 265 (x2); 1988 740 Turbo Estate.
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Old Mar 27th, 2020, 11:30   #4
volvo again
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May also be worth checking the pcv system...
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Old Mar 27th, 2020, 20:54   #5
taiwan740
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Turboboy - how much did it cost you for the local garage to change that stuff? And how much were parts, and where did you source them from?
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Old Mar 28th, 2020, 10:50   #6
turboboy
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Default Turbo Oil Leak

Quote:
Originally Posted by taiwan740 View Post
Turboboy - how much did it cost you for the local garage to change that stuff? And how much were parts, and where did you source them from?
Now I know I am getting old when something seems fairly recent but turns out to be seven years ago. I'm turning into my Dad!

Took the car to my local Volvo dealer because a) they are within walking distance and b) there was another job that needed diagnostics and I only had a cheap hand-held OBD11 at the time.

Parts were:
31251439 Sealing Ring (Turbo Pipe)
31251456 Gasket Turbo Oil Pipe

Parts cost back then was 3.20 so maybe 6.40 in today's costs.

No labour time listed on the invoice (just a total) but I'm guessing that they charged me an hour.

If you are planning on doing the job yourself and do not have a local Volvo dealer to get the parts from then I would recommend either phone (or probably emailing) FRF Swansea who I cannot recommend highly enough, or alternatively Parts for Volvos Online).

HTH
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Previous: 2000 Volvo V40 T4; 1981/2 265 (x2); 1988 740 Turbo Estate.
Current: 1998 Volvo V70 T5.
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Old Mar 28th, 2020, 12:36   #7
SteveSarre
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I think that when I did one of these, one of the small bolts that holds one of the joints together was difficult to get at. Maybe it was Hex or Torx.

Anyway I did what I could and asked the local indy to do it properly when they next had it in.

It is not complicated but awkward when lying on your back.

Might be worth buying spare bolts just in case they get rounded

Parts for my 98 T5 are
Gasket 1.00 3514546
Hex. socket screw 2.00 986871
Sealing ring 1.00 30637866


HTH
Steve
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Last edited by SteveSarre; Mar 28th, 2020 at 12:41.
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