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  View original topic: 25 hp motor question
John cilia Wed Dec 04, 2019 12:06 pm

Does anyone know what goes in the small bottom hole of block?
Iam peiceing this motor together and wondering what parts go into it.
Thanks

finster Wed Dec 04, 2019 12:42 pm

do you mean the hole at bottom right? crankcase plug and has a slotted face

John cilia Wed Dec 04, 2019 12:49 pm

So there are no springs or other parts behind it ?

finster Wed Dec 04, 2019 1:22 pm

I've never removed one but pretty sure it's just a plug

sgmalt46 Wed Dec 04, 2019 4:18 pm

John cilia wrote: So there are no springs or other parts behind it ?

nope nothing behind it.

John cilia Wed Dec 04, 2019 4:22 pm

Thanks for the good info.
John

mikeandkirsti Thu Dec 05, 2019 1:34 am

The plug is tapered and you can use the original VW plug with a provision for a large screwdriver or buy a modern tapered plug in the same size (available from Würth in Europe) with a provision for a hex key wrench.

blood Sun Dec 29, 2019 5:51 pm

I think this opening is a drilling for the oil pickup tube to spigot into. Also on the 25 hp engine there is no internal opening to allow the oil in this timing gear area to drain back to the main sump. I believe that by the time 36 hp engines were built, a drain back passage had been cut into one of the case halves. I would also guess that would be a OK modification to perform on those early 25 hp engines. That would allow all oil to be removed during oil changes. Please chime in if some has had experience in this.

Zwitterkafer Sun Dec 29, 2019 7:19 pm

The oil drain-back passage question was recently answered in another thread:

PR entry reads: Jan 1950, from chassis 1-0138765, unit # 170086:
Crankcase: "Now: Oil can be completely drained off (passage through timing gear chamber)"



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