Had seen others talk about swapping the original generator driven water pump with a 1980 Subaru Brat 1.6L pump. That eliminates the generator which for an H-Mod isn’t entirely necessary. On my engine I had scored a generator eliminator jack shaft. But still wanted to eliminate the Crosley water pump.
I had seen instructions on the web and some preliminary drawings but until I started turning metal did I fully understand the process.
1980 Subaru Brat 1.6L water pump Bech and Arnley # Picture of pump
Champion 400A pulley- Tractor supply or most hardware stores
6 ea 6-32-1/2″ socket screws
5 ea 1/4-28-xxx hex head bolts and lock nuts/washers
3 ea 5/16-18-5/8″socket head or hex bolt/ washers
3″x2″-1/4″thickness-3 ” long Aluminum angle stock
First was to take the Champion 400A pulley and turn the center out of the pulley to allow its flat back face to attach to the front of the Subaru pulley front.
For my pump the diameter of the Champion 400A to fit the pump was 2.015″. Faced the pulley to ensure flat mating surfaces.
Then Turned the back half of the Subaru water pump off to eliminate the unnecessary material. I turned down to the pulley bottom. Beware I turned this on the lath by holding the water pump body still, using dead center on the impeller shaft and turning off the pulley. The pulley is cast steel and very soft in my situation. “TAKE ALL SAFETY PRECAUTIONS”
Next determine a bolt circle on the inside of the “Champion 400A Modified” pulley and the Subaru pulley to allow 6ea 6-32 by 1/2″ socket head crews to be drilled thru the Champion 400 A pulley and taped into the modified Subaru pulley. For my application that was 2.45″diameter.
Screw to hold 400A pulley
400A pulley on Subaru hub
Next fabricated from 4″x4″ by 1/4″ thick Aluminum plate a backing plate for the water pump. For my application I used 1 1/4″ diameter tube as the outlet to the Crosley engine.
I haven’t finished this yet so decided to publish interim steps. Will edit once installed into SIAM.