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#1

Main Message Board / Re: Drilling a hole in shaft a...

Last post by Noah - Today at 09:42:54 AM

I hate to be a naysayer but...wasn't there a hole already drilled in your shaft for your pervious 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?

#2

Main Message Board / Re: Drilling a hole in shaft a...

Last post by waughoo - Today at 07:36:02 AM

Stainless can be pretty problematic to drill.  I can only imaging the added challenges of doing it under water. 

#3

Main Message Board / Drilling a hole in shaft after...

Last post by Stefanojo - Yesterday at 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

#4

Main Message Board / Re: Impeller doesn't fit

Last post by Jon W - Yesterday at 04:07:17 PM

Pete, on the Catalina Direct page scroll down to Technical Support. "Two Versions of the Oberdorfer Pump" will answer your questions.

#5

Main Message Board / Re: Impeller doesn't fit

Last post by Ron Hill - Yesterday at 03:05:29 PM

Pete : I agree that all Oberdoffer (models) impellers are the same diameter. 

A thought

#6

Main Message Board / Re: Impeller doesn't fit

Last post by Pete G - Yesterday at 08:55:41 AM

Here was the answer, but my "lathe" was a file on the outer lip.  The mushrooming wasn't visible to me, but hey, I have bad eyesight.

Your axle end seems mushroomed, was that before or after trying to fit the new impeller? Seems you hammered on it. Get it cleaned on a lathe, and check the diameter of both axle and impeller. I've seen people use freezer for the axle to have tiny bit of lower diameter, but it might be also the wrong shaft / wrong impeller combination.

#7

Main Message Board / Re: Hatch covers for forward a...

Last post by krafty81 - Yesterday at 08:54:21 AM

I wish I was as handy as you guys! Whatever I tried to make would not pass muster with the boss (wife).! Talking with Canvas Services here in SD as recommended.

#8

Main Message Board / Re: Hatch covers for forward a...

Last post by robbjd - Yesterday at 08:20:15 AM

Like I said in my original post, the snaps are already in place on the covers. When these covers are shot I'll try the elastic hem idea.

#9

Main Message Board / Re: Impeller doesn't fit

Last post by scgunner - Yesterday at 06:38:09 AM

Pete,

I've got an early boat too #273 and I've been using the one with the paper gasket for years, I don't think there's any difference between the impellers. You can check the inside of the cover to see if it has a "O" ring.

#10

Main Message Board / Impeller doesn't fit

Last post by Pete G - July 09, 2025, 06:06:41 PM

I set about to replace my impeller.  The one on the shaft took a lot of coercion to remove, and the replacement does not fit.  I went to my mechanic and he gave it a shot with an arbor press, and it destroyed the impeller.  Looking on Catalina Direct, I see a late and an early Oberdorfer.  Any suggestions?


https://www.catalinadirect.com/shop-by-boat/catalina-38/engine/engine-cooling/water-pump-impeller-kit-late-oberdorfer/?SearchResults=1

https://www.catalinadirect.com/shop-by-boat/catalina-38/engine/engine-cooling/water-pump-impeller-kitearly-oberdorfer/?SearchResults=1

Does anyone know if there's a difference between the two, and if so, what it is?  My engine is #500056.