I've done a search on this website (using Google
custom search) as well as a general search of the wider web, and I can't find anything.
Basically I have a 1960s (boat is 1959) era Atomic 4, and my water pump
does not have a rubber impeller. Instead it has two bronze
(it maybe brass?) gears that intermesh. The lower gear
is driven by the engine
, and the upper gear
is on a shaft, driven by the lower gear, but doesn't drive anything else. The upper gear and shaft are easily removable. Three shafts don't have bearings. The gears look to be in good shape, as do the shafts.
There's a 5/8" rubber hose for the raw water
feed, and what looks to be a 3/8" copper tube with a compression
fitting for the outlet.
There is a grease cap on the water pump
The cover plate is held on by eight Flathead machine screws that look to be about 4 mm, although from the age of the engine
I'm assuming they're an SAE size, maybe 3/16"
I had the pump
off this weekend and used a drill and a bucket of water
to verify it does pump water
. It's a good strong flow, and of course my drill is running at around half the RPMs that the engine does at idle.
My engine runs consistently at 160f, which I understand that's the thermostat setting for raw water
cooled Atomic 4's, so everything is apparently working properly.
I don't have any flowing water from the exhaust
when running the engine, but it did make a lot of steam.
Basically I'm looking for any information anybody has on this style water pump for an older Atomic 4 engine.
I couldn't find any manufacturer or model information on the pump. I understand the older engines used an Oberdofer pump with a grease cap, but all the information I can find on those points to a rubber impeller.
Thanks for any information you can share.
Ps I forgot to take pictures while I had the pump off, but I could take it back off and take pictures if needed.