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Another B21 Block question Oil plug or water plug

F

followingsea

Regular Contributor
"I recently installed a replac

"I recently installed a replacement oil cooler on my B21 block (It was formely an AQ140a but I converted it to a single Solex downdraft).

The old oil cooler had a threaded hole for the oil pressure sending unit. The replacement doesn't.
Just a little right of where the Oil filter sits there are two brass plugs screwed into the block. The larger, one is about 5/8" and the smaller one (below) is about 3/8". Is that smaller hole accessing an oil gallery? Can I install the pressure sending unit there?"
 
"Dennis, I don't think you

"Dennis, I don't think you need a cooler with a single carb arrangement.

The port for the oil sender is just at the right side of the oil filter (above the filter) between cylinders 1 and 2; this is the place where the oil pressure switch or pressure sender is normally installed."
 
"E.P.,

It is the smaller of

"E.P.,

It is the smaller of the two plugs right? I recall that we had a discussion about the subject of going from the AQ140 config (2 sidedrafts) to the AQ125 single carb configuration--and not needing the cooler.

However, I'm keeping the oil cooler because I have a plan in the very near future to put a little Weber 32/36 carb on the motor. A machinist friend already made an excellent adapter. So, I figure the oil cooler is insurance if the motor puts out a little higher performance."
 
"This is the one:

<[img]"ht

"This is the one:

149419.jpg


Alternatively, you can use this one:

149420.gif
"
 
"E.P.,

Thanks for the photo

"E.P.,

Thanks for the photos. EXCELLENT SERVICE!

Yes, that's the plug I was planning on tapping into.
I just ran outside and shot a few pics of my motor just so you'll know exactly what I'm working with.


149424.jpg


149425.jpg
"
 
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