'85 Oildyne Trim Pump Reservoir - Can I switch from metal to plastic?

[Twhjelmgren28]

So I've been digging deeper into underlying issues on my 1985 16.5' Sierra fiberglass boat. I've recently come across rotting stringers and transom - I'll be posting a thread in the restoration page for help / progress.

I do have an additional question: I've got the oildyne trim pump with the metal reservoir. I'd like to switch it to the plastic reservoir for ease of filling and seeing the fluid. It looks like the oildyne pumps that originally came with the plastic reservoir are the exact same size as the ones with the metal reservoir. Also, it appears they both screw on with a single screw from the bottom. Can anyone confirm that the plastic reservoir is a direct replacement in place of the metal one?

 

[Twhjelmgren28]

Doesn't seem like anyone knows so I'll probably just give it a shot and post my results if / when I get them.

 

[alldodge]

Was just looking at the Oildyne new style manual and Merc manual 4 for old style. The old uses several screws which hold the bottom plate on, the new uses one in the bottom center

The old pump motor appears to use more screws to hold in on the top then the new

In short I don't know

 

[Twhjelmgren28]

Was just looking at the Oildyne new style manual and Merc manual 4 for old style. The old uses several screws which hold the bottom plate on, the new uses one in the bottom center

The old pump motor appears to use more screws to hold in on the top then the new

In short I don't know

Thanks for looking into that - I saw there were some plastic reservoirs that had 4 screws as well. I wonder if those would fit. I'll have to pull out the pump and see what's going on. Worse case scenario, I leave it as is - it ain't broke so don't really need to fix it I guess.