[C320-list] Perkins M30 Raw Water Pump

[Warren Updike]

Dave is spot-on with his info. As I remember, I initially thought I would rebuild the pump with new parts until I realized I'd have to pull the gear off the shaft and press on a new one. That's when I found Depco Pump, and am not sorry I did. The pump came back ready to install and painted like it was new. No problems since.

The "Perkins Workshop Manual" is on our website. Section 10(page 74 of PDF,) addresses the raw water pump, and states: "Attention: Do not loosen the drive housing of the raw water pump. The alignment of this
housing has been carefully adjusted with a special alignment tool." Only the four setscrews that fasten the pump to its drive housing should be removed. (Just a caution.)

Pull it out, have it repaired. Save the old screws from the end plate for spares as these are prone to damage.

Warren and Pattie Updike
1994 C320 "Warr de Mar" #62
Middle River, MD (Chesapeake Bay)

-----Original Message-----
From: Dave Hupe [mailto:hoopdtwo at yahoo.com] 
Sent: Saturday, July 21, 2018 12:30 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Perkins M30 Raw Water Pump

 Mark-
I'm not sure why you bought both a rebuild kit and a new pump.  I had the seawater pump for my 1994 Perkins Perama M30 engine rebuilt by Depco  Pump Company http://depcopump.com/ for about $277 total (would have been less, but the shaft was scored and needed to be replaced which was the most costly item).  I was concerned about the new pump model you mentioned, but see at https://www.parts4engines.com/perkins-perama-m30-raw-water-pump/  that it replaced the original Jabsco model 29450-1101. So, it should work (also, the one you bought apparently for $260 was cheaper than my rebuilt one). 


The pump removal is indeed easy....just remove the 4 bolts and it will pull off/out (it may take a little careful prying).  Pay attention to the orientation. There is a big gear attached to the end of the pump shaft that the engine drives to pump the water.  That gear will come out with the pump.  I assume you expect to be able to transfer that gear to your new pump shaft?  I don't know how easy that is since Depco did that for me.  
Reinstallation is easy.  Just slowly align the pump to the engine mount.  You may need to rotate the pump slowly as you insert the gear into the engine cavity to get the teeth lined up with the matching gear inside the engine. I oiled the gear (with diesel engine oil) before installation. There is a large o-ring that seals between the pump mount and the engine block.  Did you get that with the new pump? Make sure you have a new one before you do this job. 
I can send you some photos separately if you would like. 
Dave Hupe
1994 Cat 320 (#32)
Holland, MI