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old fuel in crankcase(?)

Inspection methods?

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grvlpt
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old fuel in crankcase(?)

#1

Post by grvlpt » Sun Aug 12, 2018 8:56 am

A recent purchase of a 55 Pan revealed that the PO had left it sit several years w/o draining the fuel. When we put fresh fuel into the tanks, the carb started to leak indicating the needle valve was stuck open. Removed the gummed up carb for soaking and noticed the telltale dried fuel in the bottom of the intake manifold. Now I'm wondering if that gas didn't leak past the cylinders and down into the crankcase. Whats the best method to inspect and or/clean it out(other than teardown)? Engine was given a complete rebuild just prior to being put away.



1950Panhead
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Re: old fuel in crankcase(?)

#2

Post by 1950Panhead » Sun Aug 12, 2018 1:13 pm

Now I'm wondering if that gas didn't leak past the cylinders and down into the crankcase.
Remove engine drain plug, see what comes out.

Excalibur
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Re: old fuel in crankcase(?)

#3

Post by Excalibur » Sun Aug 12, 2018 1:26 pm

Else you could disconnect the oil return line and waste it into a bucket.

Mark44
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Re: old fuel in crankcase(?)

#4

Post by Mark44 » Sun Aug 12, 2018 6:14 pm

1950Panhead wrote:
Sun Aug 12, 2018 1:13 pm
Now I'm wondering if that gas didn't leak past the cylinders and down into the crankcase.
Remove engine drain plug, see what comes out.
Since the bike sat for so long, changing the oil would be a good thing to do whether or not some fuel had leaked into the crankcase.

cant-drive-55
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Re: old fuel in crankcase(?)

#5

Post by cant-drive-55 » Sun Aug 12, 2018 7:54 pm

Remove the drain plug. Allow new oil in case and slowly kick engine to hopefully dislodge any dried fuel. Reopen drain and kick again to try to get out. Let the oil drain on paper towels to see what may have been in there.

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