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Smoke out of oil filler

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Eriklane

10-18-2007 07:27:10




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I notice that my '48 8N smokes out of the oil breather. Rad fluid is clean, and not going down. New head gasket. Any ideas? Also, I have been seeing more blue smoke out the exhaust. Is it possible I have a stuck valve? If so, how to correct it? Thanks.




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Steve in PA

10-18-2007 13:27:36




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 Re: Smoke out of oil filler in reply to Eriklane, 10-18-2007 07:27:10  
I just had the same problem with a lot of smoking out the oil filler tube. I too irrationally hoped it was a valve. But a stuck valve won't let smoke into the crankcase where the oil filler is- that must be blowby around the piston from bad rings or something. In my case it was a whole dropped sleeve. A compression test told the story.



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Eriklane

10-18-2007 08:57:50




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 Re: Smoke out of oil filler in reply to Eriklane, 10-18-2007 07:27:10  
How do I 'pop off the valve side covers'? I do notice it missing some, or what sounds like it.



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soundguy

10-18-2007 11:36:10




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 Re: Smoke out of oil filler in reply to Eriklane, 10-18-2007 08:57:50  
There is a nut holding on each cover under the manifold. may have 50yr old gasket glue holding them on.. carefull.. they are thin..

soundguy



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gahorN

10-18-2007 07:59:20




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 Re: Smoke out of oil filler in reply to Eriklane, 10-18-2007 07:27:10  
Here is where a "leak down" or "differential" compression test really sparkles!

Place the piston at Top Dead Center (TDC) so both valves are closed, and with the spark plug removed introduce compressed air thru the spark plug hole. (Typical differential compression gauges *recommend 80 psi) Observe the differential pressure in the low-side gauge to see the relative health of the cylinder.
But LISTEN to the engine. (You don't really need a special gauge set up to do this, you can simply introduce compressed air to the TDC cylinder.) If you hear hissing at the intake of the carb...it's an intake valve leaking. If you hear hissing at the exhaust pipe it's an exhaust valve leaking. If you hear hissing at the oil breather/filler cap, it's piston/rings leaking.

Voila! Instant, positive diagnosis!

(You'll have to prevent the engine from turning during this test by placing it in high-gear and locking the brakes, or otherwise locking the engine from turning due to the introduction of compressed air.)

*Differential Compression Gauge test-sets can be found at aviation supply houses and lesser-quality units at discount tool outlets.

third party image

US Industial unit sells for $51 @ Link

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soundguy

10-18-2007 07:36:43




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 Re: Smoke out of oil filler in reply to Eriklane, 10-18-2007 07:27:10  
Blue smoke is oil.. usually means a worn oil control ring.

Some emoke out the filler tube is probably blowby.. means worn compression rings.

New head gasket? You overheat? overheating can weaken rings..

In any case, if you think it may be a valve.. do a dry/wet compression test.

if your numbers from dry to wet come up.. then that is a sign of weak rings.. if they dont come up.. that usuall menas valves.

stuck valves can usually be 'heard' as a miss.

You can also pop off the valve side covers with some monkey fingers and a bit of delicate work without removing the carb or the manifold.. and then visually verify that all the valves work.

post back

Soundguy

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gahorN

10-18-2007 07:32:27




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 Re: Smoke out of oil filler in reply to Eriklane, 10-18-2007 07:27:10  
A little "smoke" out the breather is not necessarily bad...but a lot...and coupled with blue smoke out the exhaust indicates a broken ring or worn rings.



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