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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 smoking/burning oilViews : 2051 Replies : 45Users Viewing This Thread : |
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Apr 3rd, 2020, 13:44 | #1 |
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940 smoking/burning oil
My 940 B230FT has started to smoke between gears and when I’m pushing the clutch in coming to a stop, it doesn’t seem to smoke under load at least not very noticeable...
It did it one day and smoked like crazy almost all the time. I checked through the forums and thought it was maybe the turbo going bad or the pcv system. Pulled the pcv system apart and it was totally clogged... cleaned everything and put it back on and it was WAY better but now its like I described at the top^ It’s a big cloud of whiteish smoke(as far as I can tell) and has a strong scent of burned oil.. I don’t know if it matters but I installed a catch can a while ago and it filled “okay” fast, I gave it some engine cleaner(10min idle), new filter, new oil(cheap semi 10w40) and some liqui moly motor oil saver. Drove it granny style for 900km and changed filter and expensive oil(fully SYN 10w40) and know it developed this problem after awhile and there is close to nothing in the catch can even after cleaning the pcv system.. Best regards Jesper |
Apr 3rd, 2020, 14:08 | #2 |
bob12
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I don't know much about these things but, I always though that fully synthetic oil was not advisable for these older engines. Bob
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Apr 3rd, 2020, 14:20 | #3 |
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I've always used semi syn in mine. 10w 40
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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Apr 3rd, 2020, 14:21 | #4 |
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Have you overfilled with oil ??
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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Apr 3rd, 2020, 15:49 | #5 |
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Fully synthetic
My B230FK is on fully synthetic Shell Helix Ultra 5W40 for many years now and seems to like it. And it keeps the engine clean (left picture is mine obviously). Even after 400K miles I never have to add oil between service intervals and never had to clean the PCV system.
Smoke on gear changes or deceleration is caused by high vacuum in the intake. (worn valve stem seals?). If the turbo is the problem you will probably also find a lot of oil in the air intake hoses between turbo and engine. If the oil loss is on the intake side of the engine you would also expect the spark plugs to be black. Is the burning oil you smell not simply caused by working on the engine and touchiung the exhaust with greasy hands? |
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Apr 3rd, 2020, 17:39 | #6 |
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Apr 3rd, 2020, 17:54 | #7 | |
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Quote:
No it’s not from my greasy hands but I’m pretty sure from the big cloud of smoke coming out my exhaust Last edited by Jelle9990; Apr 3rd, 2020 at 17:59. |
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Apr 3rd, 2020, 18:40 | #8 |
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Here is the plugs! Don’t know why it doesn’t wanna upload the picture from cylinder 3, but I looks like the others soo I guess it doesn’t matter too much
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Apr 3rd, 2020, 18:42 | #9 |
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You may have already fixed the problem but the intercooler might be full of oil - worth checking! Could still be the turbo oil seals.
The redblock was never designed for fully-synth, the molecules are too small so it's not advisable to use it. I'd suggest a 15W40 semi-synth good quality (not stuipdly expensive quality but reasonable) and cleaning the PCV system again and also the intercooler.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Apr 3rd, 2020, 18:49 | #10 |
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Hi Dave
Service book for UK suggests 10w 40 semi which is what I've always used.And also just bought to do a change next week. Is 15w 40 better for the engine ? Or an older engine ? Cheers, Mark
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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940, b230ft, bad turbo, burning oil |
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