Where are all the Oberdorfers???

[KWKloeber]

Richard

Apologies for not answering sooner.  The notices of new message posts coming thru to me is haphazard at best.

They are M6 double-ended, unequal length thread, stainless-steel studs.
The OEM Kubota studs have an interference fit, but I just use red locktite to hold these.

I use two lengths - 25mm for the Ob flat base pumps and 30mm (a bit long, 27-28mm would be better) to use with the L-clips on the Sw 903/908 pumps or Ob 908 pump.  I buy them wholesale 50 a bag.

PM me if you want a set of studs/nuts (I have no clue how long it takes to get across the border.) 
Or you can get the Kubota steel studs p/n 15221-88210.
McMaster-Carr also has the nuts p/n 94710A103 and 27mm studs p/n 5580N112

-Ken

[Phil Spicer]

Reply 5, Kirk said his Sherwood would not hold a prime. Helped a C30 (1988) friend this weekend and that may be his Sherwood problem. What is the fix to prime the pump short of changing to an Ob pump?
He would like to sail sooner than waiting for a new pump. If the problem is loss of prime, will this continue to happen.
 Checked the impeller and no missing vanes.
 I don't know if the engine is a M25 or M25XP. I expected to see the same engine
as I have since we both have 1988 Catalina's. Mine is the bronze color, his is the silver blue color.
 Time didn't allow for checking for plugged lines or plugged heat exchanger.
I know I'll get some good suggestions, thank you.
   Phil

[scgunner]

Phil,

What is your friend's priming problem, is he losing the prime while the motor is running or is he unable to get a prime when starting? The number one thing that causes priming problems is an air leak, it either won't allow the pump to create a prime when starting or it brake the prime while running.

[Phil Spicer]

Thanks Kevin, I'll check that out when I can get back to the sail club and we have more time. This is a new problem for me. I need some direction. As Ken says, I don't want to go at this as a "wack-a-mole project. As for so many of us, this is a wonderful place to start when you need guidance finding your way through a boat problem.