Does anyone know the thread pattern for the 4 bolts on the AFC housing?

 

Rectangular?

 

looking for size, thread count.......

 

For the four AFC bolts they are M6 x 1.0 thread. Top ones are 16 mm long (18 will work, but 20 is too long). Bottom ones are 25 mm long.

I replaced all four with matching black allen head bolts.

HTH's

 

did that too, way easier to get it off now.

 

while your at it, replace the ones that hold the plate in. Same size just get the same length as the screws 1/2". Suggestions, file a starting point on the screws so they center a little easier. And, make a gage or guide, the same shape as the plate, out of heavy gasket material, and use it all the time to help eliminate washers and screws dropping down in the pump.
Marv.