Broken screw on Volvo Penta impeller pump housing

[bankofdad]

Agree with the others, just fit a new cam eg. Jabsco 490 Pump Cam Plate for Flexible Impeller Pumps but use a stainless screw. To remove the epoxy just heat the local area with a soldering iron which will soften the epoxy so you can just push out the remnants of the screw. The thread is in the cam so its only a plain hole in the body. Use a drill bit to remove any remaining epoxy. Seal the new screw to stop water leaking.

The Johnson pumps I have come across have a 8-32UNCX8 cam screw so do not assume metric just because the cover plate screws are metric. What is your pump Johnson model number?

Www.solocoastalsailing.co.uk

Thanks its a D1-20F engine, unsure of pump number as not on boat at mo

 

[Plum]

Thanks its a D1-20F engine, unsure of pump number as not on boat at mo

A quick search gives a Johnson part number for the complete pump as 10-24751-01 which is a F4B-903 model.
Individual part numbers of cam and screw and copper washer are shown below. The screw is shown as a 8-32UNCX8

 

[Thresher]

Hi all had a bit of raw water ingress at the weekend - it filled the sump under my VP D2 when I had to gun it to get into Portsmouth in the face of the last part of an ebb tide.

Upon inspection & running engine to find the leak a painted brass screw had broken at the top. I tried to screw in a temp replacement from stocks on board but thread has also gone and with a bit of original left in.

As a temp fix I epoxied the hole leaving the remaining screw piece still in place behind the epoxy.

It held absolutely fine and no more water entered the boat on the return trip.

What does that screw actually do for a living?

I’ve found references to buy one but no actual context to what it does.

Also now I’ve filled with epoxy presume I’ll be looking at a whole new housing.

I've just had exactly the same problem with my Volvo D1-13. I finally got around to investigating a small drip from the cam screw that I had been ignoring for months. With the impellor removed, the cam lifted out to reveal just the stump of the screw, the head was gone. Easily removed and replaced with a spare screw that I was lucky to have amongst my spares.
I wonder how common this is?