oil in coolant 940 2ltr turbo

Sep 12th, 2002, 21:48

Hi I'vejust bought an automatic Jreg 940 estate and I love it. I had a 240 estate a while back, and missed it when it had to go (for recycling!). Anyway, everything seems fine except when I checked the coolant it seemed very dark, and a dipped finger came out oily. There's no sign of water in the oil BTW. Any ideas? I wondered about the turbo with having water cooled bearing housing

John

Peter Milnes · Sep 13th, 2002, 01:20

Do you have mayonnaise inside the oil replenishment cap on the rocker box? If so get ready to do either an Italian tune-up or a compression check to see if the head gasket is going. The other problem you could have is the radiator has sprung a leak between the water part and the gearbox oil cooler part. Check for water contamination in the auto box. If you are lucky a flush and refill of auto transmission fluid and a new radiator should see you on the road again. Radiators obtainable from German, Swedish and French or Eurocarparts at approx £130.

All the best, Peter.

Sep 13th, 2002, 08:45

Thanks for that, Peter. I've chected the oil filler cap and the dipstick and there's no sign of 'mayonnaise'. Also, FWIW, the oil in the coolant shows no sign of the red colourant from ATF. I can see that the car has had a recent radiator change, and the ATF level and appearance are fine. his weekend I will try draining the coolant and replacing it, and I'll also keep a careful check on the oil levels, see if I can learn a bit more

John

sheerwater · Sep 13th, 2002, 09:05

Agree with above . Only comment I have is that if oil is in the water a compression test may not actually find it. Oil is escaping via the oil channel to a water channel while the compressive part of the head gasket is still holding compression. Any leaks around the edge of the head gasket? An easy solution as step one might be to check tightness of head bolts. Good chance you will need a new head gasket though. If however its had a new radiator maybe the gasket blew before and what you are seeing is the residue in the coolant from previous dismantling.Cheers Nigel

Sep 12th, 2002, 21:48	#1
johnbarryfan Guest Location:	oil in coolant 940 2ltr turbo Hi I'vejust bought an automatic Jreg 940 estate and I love it. I had a 240 estate a while back, and missed it when it had to go (for recycling!). Anyway, everything seems fine except when I checked the coolant it seemed very dark, and a dipped finger came out oily. There's no sign of water in the oil BTW. Any ideas? I wondered about the turbo with having water cooled bearing housing John

Sep 13th, 2002, 01:20	#2
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	RE: oil in coolant 940 2ltr turbo Do you have mayonnaise inside the oil replenishment cap on the rocker box? If so get ready to do either an Italian tune-up or a compression check to see if the head gasket is going. The other problem you could have is the radiator has sprung a leak between the water part and the gearbox oil cooler part. Check for water contamination in the auto box. If you are lucky a flush and refill of auto transmission fluid and a new radiator should see you on the road again. Radiators obtainable from German, Swedish and French or Eurocarparts at approx £130. All the best, Peter.

Sep 13th, 2002, 08:45	#3
johnbarryfan Guest Location:	RE: oil in coolant 940 2ltr turbo Thanks for that, Peter. I've chected the oil filler cap and the dipstick and there's no sign of 'mayonnaise'. Also, FWIW, the oil in the coolant shows no sign of the red colourant from ATF. I can see that the car has had a recent radiator change, and the ATF level and appearance are fine. his weekend I will try draining the coolant and replacing it, and I'll also keep a careful check on the oil levels, see if I can learn a bit more John

Sep 13th, 2002, 09:05	#4
sheerwater Master Member Last Online: Feb 24th, 2019 17:59 Join Date: Dec 2001 Location: Northampton	RE: oil in coolant 940 2ltr turbo Agree with above . Only comment I have is that if oil is in the water a compression test may not actually find it. Oil is escaping via the oil channel to a water channel while the compressive part of the head gasket is still holding compression. Any leaks around the edge of the head gasket? An easy solution as step one might be to check tightness of head bolts. Good chance you will need a new head gasket though. If however its had a new radiator maybe the gasket blew before and what you are seeing is the residue in the coolant from previous dismantling.Cheers Nigel

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