1938 DT-38 Johnson 4.2 hp crankcase

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Buccaneer
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Joined: Mon Mar 09, 2015 9:34 pm

1938 DT-38 Johnson 4.2 hp crankcase

Postby Buccaneer » Tue Sep 12, 2017 9:33 pm

I tore apart the crankcase on the subject motor.
There's an oil drain galley / passage between
the upper and lower crankshaft main bearings.
Inside the galley is a tiny copper tubing, shaped
to fit inside of the galley.
Is this suppose to be there, or is it something someone
added? If someone decided it needed a restriction,
why not just have a short piece in the middle?
Thanks!
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Buccaneer
Posts: 2008
Joined: Mon Mar 09, 2015 9:34 pm

Re: 1938 DT-38 Johnson 4.2 hp crankcase

Postby Buccaneer » Wed Sep 13, 2017 8:11 pm

I could not find anything in the 3rd Edition Johnson service manual about
the little tube in the oil drain galley, and never have come up with
a parts manual for this era of 1938 to 1940 4.2 and 5 hp Johnsons.
I did find a "froze up" parts engine on the rack, so I tore that apart today.
That too, had the little copper tube in the oil drain galley..... strange design..
or poor engineering?


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