Speedseal vs DIY alternative

[Sarnia]

Most probably the size is "8-32" and the outside diameter ia 4,166mm. Many years ago I asked my late sister to get me a length of SS threaded rod when she was visiting from Canada. At that time threaded rod in anything that was not metric was unobtainable here.

I Loctited short lengths in the pump body and turned some large diameter knurled nuts out of 12mm brass rod. I already had the 8-32 taps from another project. Just a small Saturday morning job if you have the right tools

Not even Jabsco can tell me the thread size! so I anticipate doing something similar to you, how I wish I had a small lathe! I will not be back on the boat until next February but will take a thread gauge and some screwed rod and some taps with me.

 

[jonrarit]

a chap proposed making a 'Speedseal' or similar copy using 10mm Polycarbonate so that he could do a regular/easy visual check on his impellor

Just come across this and I'm thinking it is not as daft as it sounds........ with access to a CNC router I reckon I could knock one of these up in minutes in polycarb ..... I'll give it a go and report back. Obviously not until the new season........

JR

 

[ghostlymoron]

I got some stainless knurled thumb screws from ebay a few weeks ago - from memory about £10 for a pack of 3. My Beta 25 has an 'O' ring in the cover and the the thumb screws work well, I also grease the 'O' ring when re-assembling.

What size did you get? they're not standard M3 or 4 mine are 5/32" unf (3.97mm). You would think that 4mm is close enough but the thread pitch is different.