Need HELP on Diagnostics Nissan Sentra

[jorgeva]

Hi,

I have a 1987 Nissan Sentra, 5 speed manual transmission, 1.6 L.

The car was taken apart. The head was checked for cracks, re-surfaced, by a professional machine shop.The valves and seats were all done by certified shops.

When I get the car, white / blue smoke is launched from exhaust.

I check the spark plugs and only one is filled with black “gunk”, burned oil.

They perform leak tests and compression tests … All good!

They re-adjust the valves and double check the seats. Everything seems fine.

Still smoking and burning oil very fast.

Now, they want to try a re-built carburetor and spend more money on it.

Do you have any suggestions? … Thanks! … [email protected]

Jorge

[RED_DET]

Piston rings not sealed properly.

[jorgeva]

Leak test and compression tests are all good, so how can this problem be tested to confirm the problem / fix?

[ridgerunner196502]

jorg, if yu are burning oil, trust me it aint cuz yu need a carb rebuild. they are trying to milk yu out.oil,can come into piston hole from the top(valve guides) or the bottom{worn rings or cracked piston lands}spend 20 bucks and get yur own comprresion gauge and do your own test.betcha thewhole with the greasy plug is showing way less compression than the rest. let us know what happens!