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 Posted: Apr 28, 2022 03:55AM
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I will start by checking the plugs to see which cylinder(s) are involved. Then I will remove the head and have it tested for cracks. I hope that will be the end of it. Thank you for your insights.
John G.

 Posted: Apr 27, 2022 10:52PM
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GB

Yes, is the answer.

Heads can crack in different ways; I've had water in the bores, water in the exhaust, and pressurised cooling system.

Ask the machine shop where the crack was that they attempted to repair.

 Posted: Apr 26, 2022 04:48PM
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Two comments/clarifications needed.

1.
You said breathers were clear. Need some more proof.
With the engine running and hot, remove the cap off of the valve cover.
If you have a "fog" of oily air coming out, then high crankcase pressure is likely, ie, breathers not breathing enough. 

2. sparkplug color and/or oil contamination? How many are affected? 

 Posted: Apr 26, 2022 03:57PM
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OK, grey-blue, and quite heavy.
Definitely oil.
Rich would be black and sooty.
Antifreeze would be white and sweet-smelling.
Any thoughts?

 Posted: Apr 26, 2022 11:43AM
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CA
Quote:
Originally Posted by Kermy
"Grey" smoke sounds like too rich mixture to me.
Ditto.
To me "blue" smoke equals oil. White smoke equals water (coolant).

You should also be able to differentiate by smell between the three. Over-rich smells "dirty" (and the tailpipe will be sooty), oil smells oily (and the tailpipe will feel oily) and water is steam so it should not have much of a smell.

Now for taste...
??

.

"Hang on a minute lads....I've got a great idea."

 Posted: Apr 26, 2022 09:03AM
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"Grey" smoke sounds like too rich mixture to me.

 Posted: Apr 26, 2022 07:55AM
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Hello gang,
I am struggling with a 1976 basket case with an oil-burning problem.
1) The previous owner removed the 1275 engine because of oil burning (grey smoke). 
2) I send out the head for new seats, guides and valves. The machine shop found a crack in the head that they claimed could be welded, so that was also done. I honed the cylinders and put in new pistons and rings, studs, bearings, etc. The cylinders were already maxed out at 60 thou over so the hone may have been a little sketchy... I put everything back together and the engine ran well. After a few minutes, it started blowing grey smoke. I thought it may be leftover oil in the exhaust system that was burning off. No, even after 200 miles of driving it still smoked.
3) Pulled the engine, sent the block for a rebore with new standard liners, installed new pistons, etc, etc.
Started it up. Ran great, but again it started smoking. :-(
I checked the breathers were clear, the oil cap was clear, the valve seals were on all 4 intake valves, etc.
I've rebuilt several engines over the years (mostly Jaguar) but this one has me stumped.
Could there be a crack in the head that would leak oil into the cylinders?
Any and all suggestions welcome.
Thank you!
Jean (John) Gadbois