Gundge-A

[Rocketsled]

Getting my newly aquired, but long neglected engine going-looked inside the combustion chambers and they are thickly coated with gundge.
What is the best way to clean-out this goey mess while running the engine?
Thank you.

[V4F]

try marvel mystery oil in the gas ..........

[Ross/Kzoo]

Is it just the combustion chambers with grunge? What about the side cover and pan?

[gridleak]

What kind of grunge? My intake manifold and valve area are/were covered with a sticky goo like thick honey. I cleaned it out once a few days ago with lacquer thinner. I thought it had been in there before I bought the car last month, but when I ran the car it was back. I think the previous owner had coated the gas tank with something and that I had used gas containing ethanol that dissolved the coating, at least I hope that is the case and that the coating is not soluble in pure gasoline .
I drained the tank and am allowing it to dry before I put in some ethanol free gas.
I am allowing a bowl of the bad gas to evaporate to get a sample of the goo so I can test it for solubility in good gas.

[H. L. Chauvin]

If just combustion chamber appears dirty with carbon build up, get an "empty" spray type bottle like a Windex bottle, & with engine running at medium-fast idle, spray clean water into the carburetor's intake -- clear water will steam clean the combustion chamber, tops of pistons, & areas around valves just as clean as when water leaks into a combustion chamber because of a busted head gasket.

[H. L. Chauvin]

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FWIW:

From what gridleak is reporting, & possibly suspecting, one can confirm & read in the 1975 Volume 2 of:

"How To Restore Your Model A", (from The Restorer), page 21, TINT TIPS .. FROM READERS:

where one gentleman reader prepared & tested a gas tank sealer consisting of 80% Permatex mixed with 20% of eighty proof alcohol to coat his gas tank "after" rendering a positive sublimation test in the then gasoline "without" ethanol.

Have no idea how many Model A owners followed these instructions to seal their gas tanks with this prescribed sealer; however, it appears my tank had this sealer until the previous owner began using ethanol gasoline ........ then this sealer began to dissolve & had black tar like chips in the bottom of the gas tank mixed with rust flakes.

On the first short test run after engine overhaul, witnessed soft tar-like material in the carburetor & intake manifold -- carburetor cleaner removed some, but witnessed POR 15 Marine Clean dissolved it instantly.

Could only drive about 1/2 mile before having to disconnect gas line at carburetor & blowing in the gas line to unclog the shut-off valve on the bottom of the gas tank.

After cleaning carburetor & intake with MC, cleaned gas tank with warm water & POR 15 Marine Clean circulating & forced through an electric water pump -- not a problem since this last cleaning.

Hope this helps.

[Rocketsled]

Thanks everyone. I always use MMO, but the water spray was the answer I was looking for. Rocketsled.