Bluish White Smoke - Smells Bad - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 18 (permalink) Old 11-14-2019, 01:54 PM Thread Starter
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Bluish White Smoke - Smells Bad

My 1983 Datsun 280zx NA is now blowing smoke (lots at startup) and then more noticeable while accelerating. The smell is terrible and leaks into the cabin. I tore this engine down to the head 3 months ago. New gaskets, R&R the head along with new valve stems. The works. I know blue smoke indicates burning Oil but I just had the head resurfaced, valve stems replaced, new head bolt, new gaskets all around. I swapped the PCV hoping it would help. Am i screwed? Oil levels definitely dropping. No performance issues that I can tell. In fact, it runs great. Haven't run compression yet. Any thoughts, ideas welcome. Thanks all.

Thanks,

Jeff

Denver, Colorado
1983 Datsun 280zx Non-Turbo
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post #2 of 18 (permalink) Old 11-14-2019, 06:04 PM
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Do your compression test and a leak-down test.

Larry


1976 280Z - Street

1973 240Z - SCCA Autocross F Prepared
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post #3 of 18 (permalink) Old 11-23-2019, 06:32 PM Thread Starter
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Here are the results of compression. Nothing too out of the ordinary here is there?

Cyl,Dry,Wet
6 - 151 - 160
5 - 152 - 160
4 - 149 - 164
3 - 149 - 165
2 - 149 - 160
1 - 151 - 160

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Jeff

Denver, Colorado
1983 Datsun 280zx Non-Turbo

Last edited by Jeff Collinsworth; 11-24-2019 at 04:30 PM.
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post #4 of 18 (permalink) Old 11-24-2019, 03:14 AM
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.02c Are you sure the head gasket had proper holes for oil drainback from valve area? Might explain oil level "dropping" if oil is held on top of head. Also, lots of oil up there might be sucked in around the valve stems, more so on acceleration as pistons sucking harder (faster) on down stroke. .02c Take the cover off to check top of head.

zippityzda
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post #5 of 18 (permalink) Old 11-24-2019, 04:29 PM Thread Starter
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Originally Posted by Jeff Collinsworth View Post
My 1983 Datsun 280zx NA is now blowing smoke (lots at startup) and then more noticeable while accelerating. The smell is terrible and leaks into the cabin. I tore this engine down to the head 3 months ago. New gaskets, R&R the head along with new valve stems. The works. I know blue smoke indicates burning Oil but I just had the head resurfaced, valve stems replaced, new head bolt, new gaskets all around. I swapped the PCV hoping it would help. Am i screwed? Oil levels definitely dropping. No performance issues that I can tell. In fact, it runs great. Haven't run compression yet. Any thoughts, ideas welcome. Thanks all.
Here is a picture of the head. Nothing too crazy that I can see except for some oil pooling.
Attached Images
File Type: jpg 20191123_130410.jpg (339.2 KB, 13 views)
File Type: jpg 20191123_130423.jpg (313.7 KB, 13 views)
File Type: jpg 20191123_130433.jpg (275.3 KB, 13 views)

Thanks,

Jeff

Denver, Colorado
1983 Datsun 280zx Non-Turbo
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post #6 of 18 (permalink) Old 11-24-2019, 11:59 PM
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Mr.Collinsworth:

Call me pedantic, but I can't help wondering about the read of the plugs.

And how old are the rings?

As a discussion point, I would note that good compression rings do not guarantee the efficacy of the oil control rings...

Just a thought...



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post #7 of 18 (permalink) Old 11-25-2019, 03:58 AM
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Certainly no oil retention.
The PCV was replaced. Have you checked if the hose is "clear" so crankcase pressure is being relieved so as not to force oil around the rings?

zippityzda
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post #8 of 18 (permalink) Old 11-25-2019, 03:25 PM Thread Starter
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Originally Posted by dumbestone View Post
Certainly no oil retention.
The PCV was replaced. Have you checked if the hose is "clear" so crankcase pressure is being relieved so as not to force oil around the rings?
Dumbestone, ill check on the PCV hose. Also, are you not seeing an issue from the pictures of the cyl head? Is the pooling excessive in your opinion or cause for concern?

Thanks,

Jeff

Denver, Colorado
1983 Datsun 280zx Non-Turbo
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post #9 of 18 (permalink) Old 11-25-2019, 04:29 PM
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No pooling of significance. If the returns were blocked there would be a "flood" of oil. Only see nooks and crannies....normal.

I seem to remember some years ago a member posted about a filter/screen in the OEM PCV hose. ... True?
But your hoses look fairly new, judging by the clamps used.

zippityzda

Last edited by dumbestone; 11-26-2019 at 03:29 AM.
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post #10 of 18 (permalink) Old 11-26-2019, 01:31 PM Thread Starter
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Quote:
Originally Posted by ensys View Post
Mr.Collinsworth:

Call me pedantic, but I can't help wondering about the read of the plugs.

And how old are the rings?

As a discussion point, I would note that good compression rings do not guarantee the efficacy of the oil control rings...

Just a thought...
Attached are the plugs. Im not very good at reading these.
Attached Images
File Type: jpg 20191126_102415.jpg (424.5 KB, 12 views)
File Type: jpg 20191126_102411.jpg (312.8 KB, 11 views)

Thanks,

Jeff

Denver, Colorado
1983 Datsun 280zx Non-Turbo
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