remove pump off engine inquiry

[sgull]

Here's another picture of that old Darley portable fire pump I've been thinking/working/posting on:

My question at this point is in regard to going about removing the pump portion from the old model (23A) Briggs engine, so I might run/test the engine (for extended times and higher-end throttles) without the pump (pump with no water) attached. Think if I remove the four bolts holding this flange (or coupling whatever it might be called) where I'm pointing in the next picture, the pump portion would just pull/slide right off the engine shaft (once that small 3/8” copper line is disconnected too of course)?

Or, do I instead or maybe in addition need to remove the “pump body” from the flange where I'm pointing in the next picture:

And here's just another shot of the business from a different angle:

Just to remove the pump from the engine I suppose I'll very likely end up needing to remove the key from the shaft? Or just remove those four big bolts connecting the pump coupling to the engine housing and the whole pump business it all should just easily “slip right off” for me? Any comments appreciated.

 

[ttpete]

You never know. It could be a spline drive. Those engines also were available with a reduction gear drive which I believe was 4:1, and it bolted on just like the pump. The crank used with the reduction gear could have been splined and would be a natural for use with the pump.

 

[sgull]

I just now tried removing the four bolts on the coupling flange connecting to the engine housing. The coupling flange then turns nicely, easily, and evenly but doesn't wanna let me pull it out even the slightest smidgen away from the engine housing.

 

[L.Cheapo]

Some of the engine/pump assemblies used a tapered shaft. Generators too. These can be very difficult to separate, especially if they've been married as long as your pump appears to have been. Some others even used a threaded crankshaft. My advice is patience, and careful, gentle persuasion. Also, you may be able to use the model, type, and code from the engine to look up what shape of crankshaft it has. That may help you in your future efforts. Good luck.

 

[sgull]

Ok thanks L.Cheapo. I'll be patient, and gentle, at least. Won't get carried away trying to pry. I'll see what I can decipher in regard to shape of crankshaft with the model number (23AFB) and the type (703525). Apparently no code (that I can find) on the engine info label/plate.

 

[sgull]

I removed all eight nuts around the pump body where I'm pointing to in the third picture. I tried rapping sharply and fairly heavily on it with a block of wood and a hammer but it doesn't seem to want to come loose. Not sure if something else is holding it or I just need to hit harder until it comes.