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F400 oil sump drain plug

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » F400 oil sump drain plug « Previous Next »

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MichaelRidout
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Posted on Tuesday, May 24, 2005 - 10:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

My 4-85 has a smooth oil sump drainhole about 3/8" in diameter. I have examined it pretty closely and I don't see any sign of threads. What type of hole should this block have for a drain? I could probably tap it to a 1/2" 20 and use an automotive plug.

Mick Ridout
m.ridout@worldnet.att.net
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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 233
Registered: 07-2003
Posted on Wednesday, May 25, 2005 - 12:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have seen an elbow in pans that sit low in a boat,they have a nut inside to pull tight and seal.The other end of the elbow has hose sticking out to the side so you can get the oil out.

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