Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-05-2008, 07:08   #1
Registered User

Join Date: Mar 2007
Location: New Orleans
Boat: Gulfstar 37 - Perseverence
Posts: 66
Changing Sherwood Pump on 4.108

I want to swap out the Sherwood pump on my 1980 or so Perkins 4108 for a completely new one. Is it as simple as removing the four nuts that hold on the old pump to the front of the engine block and replacing the pump with a new one, or is there some sort of alignment and seal replacement in the block side that will have to take place once I pull off the old pump?

thanks
__________________

__________________
jlogan is offline   Reply With Quote
Old 09-05-2008, 08:21   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2006
Location: Chesapeake Region and Maine
Boat: 42' Bob Perry sloop
Posts: 4,038
Images: 4
Email me: bill at wdsg dot com

....and I'll send you a pdf with pics and parts list for both the water pump">raw water pump and the circulating pump.

Bill
__________________

__________________
btrayfors is offline   Reply With Quote
Old 12-05-2008, 21:41   #3
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
Fairly simple to do

no alignment....put a new flange gasket on...buy a rebuild kit for the old pump.

And as you sit an a tranquil anchorage, with the warm tropical breezes wafting the smells of the islands to your boat, in the late afternoon....rebuild the pump.

Quote:
Originally Posted by jlogan View Post
I want to swap out the Sherwood pump on my 1980 or so Perkins 4108 for a completely new one. Is it as simple as removing the four nuts that hold on the old pump to the front of the engine block and replacing the pump with a new one, or is there some sort of alignment and seal replacement in the block side that will have to take place once I pull off the old pump?

thanks
__________________
Chief Engineer is offline   Reply With Quote
Old 22-05-2008, 14:45   #4
Registered User
 
bfharris's Avatar

Join Date: Oct 2007
Location: Pensacola, FL
Boat: Hunter 37 Legend - Monomoy
Posts: 16
Catalina 27

I did a search on this type of topic and this was the closest I found, so I hope I am posting in the right spot. I have a Catalina 27 with a Universal M18 that has a Sherwood pump on it. Today I discovered the pump leaking around the bottom nut that holds the pump to the block. Could be a faulty gasket, so I plan to remove it and check it out, but wanted to make sure it is as simple as that. I've worked on many cars over the years, but have no experience with a marine diesel. There are 4 nuts holding my pump to the block. Is it safe to unbolt, inspect, replace gasket, and just bolt back together?

Thanks!
__________________
bfharris is offline   Reply With Quote
Old 22-05-2008, 16:50   #5
Registered User
 
bfharris's Avatar

Join Date: Oct 2007
Location: Pensacola, FL
Boat: Hunter 37 Legend - Monomoy
Posts: 16
I think I may have found my answer with the exploded view of the pump on MarineDieselDirect.com.
__________________
bfharris is offline   Reply With Quote
Old 28-05-2008, 08:25   #6
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,335
Going from memory, I think the pump mounts with 4 bolts to a flange which mounts with 4 bolts to the engine. If you just take the pump off, everything is OK, but if you loosen the wrong 4 bolts you will need to realign things or the pump drive will rapidly chew itself up.

Rebuilding 4108 pumps in tropical islands brings back old memories--I think we had a 3-boat rebuilding party somewhere in French Polynesia about 10 years ago, and ended up with 7 workable pumps.
__________________
donradcliffe is offline   Reply With Quote
Old 28-05-2008, 10:21   #7
Registered User
 
bfharris's Avatar

Join Date: Oct 2007
Location: Pensacola, FL
Boat: Hunter 37 Legend - Monomoy
Posts: 16
I should have reported back, but I ended up rebuilding my pump last Friday. There were 4 nuts holding it on to the block. One nut was so badly corroded, I had to take the stud out instead. Replaced inner/outer seals, impeller, gaskets, one stud and four nuts/washers and bolted it back on. My main concern was how the shaft from the pump connected to the shaft in the engine, but once I had it off I was relaxed to see it was a simple tongue/groove. So I am happy to have that all done. I have years of experience with gasoline engines, but am learning diesels.

My vessel is a 1988 Catalina 27 with a Universal M-18.
__________________

__________________
bfharris is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Perkins 4-108 1983 Fuel Pump jimisbell Engines and Propulsion Systems 32 01-12-2012 10:04
Changing registration Sangamo Rules of the Road, Regulations & Red Tape 3 06-03-2008 14:47
4-108 injection pump CaptG Engines and Propulsion Systems 48 21-06-2007 17:25
Jabsco versus Sherwood SkiprJohn Engines and Propulsion Systems 7 21-01-2007 03:42
Injection pump leak 4.108-help me saildale Engines and Propulsion Systems 3 16-10-2006 20:54



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:12.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.