Recent posts

#1
Main Message Board / Re: Where are all the Oberdorf...
Last post by Phil Spicer - Today at 09:49:59 AM
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
#2
Main Message Board / Re: Where are all the Oberdorf...
Last post by KWKloeber - Yesterday at 01:06:19 AM
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
#3
Main Message Board / Re: Dodger Fasteners
Last post by KWKloeber - Yesterday at 12:17:50 AM
Tim

If there is a large hollow behind the "common sense fasteners," you can use spray insulaing foam to make a "dam" in the void and after it cures hog out enough to fill with epoxy. 
Alternately, you can use an epoxy-soaked foam ear plug to make a scew "anchor".  Or a small rubber "well nut" - they usually come with a brass threaded insert but WM has them in stainless.  Those are the most secure fastener, besides where you can put a nut on a machine screw from behind.


#4
Main Message Board / Re: Drilling a hole in shaft a...
Last post by KWKloeber - Yesterday at 12:00:29 AM
I he has the correct gear, he will be using a cobalt drill bit on stainless steel.
#5
Main Message Board / Re: Impeller doesn't fit
Last post by KWKloeber - July 12, 2025, 11:58:07 PM
Pete

Where did you get the impeller that did not fit? 
I presume that you removed the cir-clip?

1. There is no difference in impellers for the two kits that CD sells.  The difference is the paper cover gasket (for the older "202M series" pumps) vs. the rubber cover o-ring (for the current "N202M series" pumps.)

2.  I  have posted about a zillion times to dab SuperLube gel on the shaft of the pump and hub of the impeller to help prevent corrosion between the two.

If they become stuck, take a box end wrench that the shaft just passes through and hang that end over a sturdy step or wall (not hang it off the DOCK!) and step on the other end.  Use a bolt or pin smaller than the shaft diameter to tap the shaft out of the impeller hub.  Alternately, you can use a piece of pipe that the shaft just slips into to hold the impeller hub.   
#6
Main Message Board / Re: Impeller doesn't fit
Last post by Ron Hill - July 12, 2025, 01:46:04 PM
Pete : I reread your initial post and I had the same problem. Right after I got my C34 that summer we were out for a sail and coming back in I turned on the engine. 1st Mate was at the wheel when she asked me to come up as the exhaust sounded "funny". We were overheating!! The temp gage read over 200F!! I shut down the engine and told her "No sweat" as I had a new impeller and would go back below and change it out!!

I took off the Oberdoffer face plate pulled the impeller attached to the shaft out. To my surprise I couldn't (like you) get the impeller (3 blades missing - hence the overheating) off the shaft.  So we sailed to the dock. She asked if we were going to practice our docking? I told her NO practice as it was like a wheels up landing - no practice.  We docked OK!!

I took that impeller and shaft home put it in a vice and hammered the impeller off the shaft!! Even had to get a bigger hammer!! Why the impeller was fuse to the shaft (bronze/brass impeller to a stainless shaft) is unknown!!! 

So you aren't the only one that has had this problem. From then on I always put some grease on the inside of the impeller before I put it on the shaft!!

A "war story",but always use some grease, Vaseline or Chapstick when you put 2 different metals.  A few thoughts 
#7
Main Message Board / Re: Drilling a hole in shaft a...
Last post by Ron Hill - July 11, 2025, 02:54:45 PM
Steve : I agree with Noah, you already have a hole thru the shaft for a cotter pin that secured your old prop. Can't you use it for a new cotter pin thru the new prop???

A thought
#8
Main Message Board / Re: Drilling a hole in shaft a...
Last post by Noah - July 11, 2025, 09:42:54 AM
I hate to be a naysayer but...wasn't there a hole already drilled in your shaft for your previous prop? How do you lap fit the taper of the shaft/prop while in the water? Perhaps you should abandon this underwater effort and  do a "short haul" at a boatyard-—taking care of those issues while hanging in the slings?
#9
Main Message Board / Re: Drilling a hole in shaft a...
Last post by waughoo - July 11, 2025, 07:36:02 AM
Stainless can be pretty problematic to drill.  I can only imaging the added challenges of doing it under water. 
#10
Main Message Board / Drilling a hole in shaft after...
Last post by Stefanojo - July 10, 2025, 06:01:47 PM
So I got myself a new Campbell Sailor prop (love it).  The diver I hired to install it has been trying to drill a hole through the shaft in order to put a pin through it to secure the second nut. He told me this is SOP. The problem is is he hasn't been able to drill a hole through the shaft. He's broken multiple bits and supposedly has the correct gear. He's been in consultation with our local prop shop. It just seems odd. He thinks the shaft is made out of something other than stainless. I have no idea. Figured I'd check in with the brain trust