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  #1  
Old 05-21-2015, 12:27 AM
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Location: Phoenix Arizona. Ex Durban R.S.A.
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Black Smoke Blue Smoke

So I know black smoke is fuel and blue is oil. I've got black smoke under hard acceleration but I've never noticed blue smoke out of it before just recently. After I had done some work on it it was idling for several minutes in the street before I was able to drive it back into the garage. I was checking the accelerator linkages and revved it hard from the engine bay. I noticed a significant puff of blue smoke the first time I revved it after it was idling for a few minutes. Didn't do it the following few revs that I gave it. I know it's oil. My question is why only on first rev after a long period of idle? Is it valve seals? I would assume if were rings it would show blue smoke constantly no?

- Peter.

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2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
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  #2  
Old 05-21-2015, 01:06 AM
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Join Date: May 2015
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Probably the valve seals, yes. From what I understand if it's blowing blue after sitting for a while it's the valve seals.
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  #3  
Old 05-21-2015, 02:19 AM
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Every old-ish diesel I've ever seen does that, even our 10 year old work truck.

Only start worrying about it when it becomes like my car....10 minutes of idling then flooring it = white smoke screen
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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
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  #4  
Old 05-21-2015, 09:01 AM
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Location: Phoenix Arizona. Ex Durban R.S.A.
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Sort of what I figured. Thanks.

- Peter.
__________________
2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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  #5  
Old 05-21-2015, 02:28 PM
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Valve Stem Seals are cheap. The job is not too bad but kind of slow.

Make sure Pistons are at TDC so the Valve does not drop into the Engine.
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  #6  
Old 05-21-2015, 10:39 PM
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Quote:
Originally Posted by Diesel911 View Post
Valve Stem Seals are cheap. The job is not too bad but kind of slow.

Make sure Pistons are at TDC so the Valve does not drop into the Engine.
Thanks for the tip. It'll be a while yet before I get around to trying my hand at doing this one.

- Peter.

__________________
2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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