Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 22-08-2009, 18:07   #1
Registered User
Trekka's Avatar

Join Date: Sep 2006
Location: Chesapeake Bay
Boat: CSY33
Posts: 176
Images: 75
Perkins 4-108 - Cool Running!

Last fall and winter I asked a lot of questions here, and posted a lot of pictures, as I first rebuilt the water pump">raw water pump, and then piece by piece removed all the cooling system hoses and parts from my boats Perkins 4-108. The engine, like so many aged units of its make and model, had been overheating. Badly overheating at 2000rpm and above. Paperwork of the deceased PO indicated he had battled the problem, too.

I worked in my spare time through the Fall and Winter, taking apart as much of the cooling system as I could, cleaning it up, repainting, replacing some hoses and thermostat. Eventually I reassembled all the components, reattached hoses and filled with a 50/50 premix of coolant. I ran the engine while in the slip, under load with prop engaged, but never took it out before hauling this Spring for "a week or two" of work. Early in August I relaunched with a few new seacocks, backing plates, bilge hoses, and various other essential items newly installed, or cleaned up and rebedded, including a new head and associated hoses.

So I was wondering if I had really solved the overheating problem, and it was with some trepidation that I planned a 32 mile move to a new slip. I expected to be sailing most of the way, as the weather report was 50% showers and T-storms and winds 5-10kts. The day started off with lowering clouds but by the timie we slipped lines the sun was shining hot with no clouds to diffuse it. The winds were minimal and in the direction of our travel, so canceled out any effect. With temps in the upper 90'sand past noon, I had no option other than to kick over the engine and wind it up.

For the next 6 hours the Perkins ran continually above 2000rpm. At least 3 hours was at 3000rpm, and the rest of the time between 2500-2800rpm. The temp was 170F most of the time, climbing to 180F for a little while after I throttled back and the coolant flow was reduced. No smoke, no odd noises, no problems!

It feels GREAT, after all this time and toil, to have a cooooool running 4-108! (Not a subject header seen very often, huh?)

[btw, @ 3000rpm to a 3 blade prop this CSY33 was making 6.9-7.4kts!]

Trekka is offline   Reply With Quote
Old 22-08-2009, 18:15   #2
Registered User
speakeasy's Avatar

Join Date: Jul 2009
Location: La Paz
Boat: 41' Custom CC Cutter
Posts: 647
Not a subject header seen very often, huh?
No indeed! Congrats! Having virtuous work rewarded seems rare these days and finding your efforts rewarded with performance is, well, inspirational. It's been said here that all 4-108's leak. Let us know if that too is false.

"The nature of the universe is such that ends can never justify the means. On the contrary, the means always determine the end." ---Aldous Huxley
speakeasy is offline   Reply With Quote
Old 22-08-2009, 20:24   #3
Senior Cruiser
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,169
Hi Trekka,
Congratulations! It really sounds like you did a great job.
Did you change the prop any?
SkiprJohn is offline   Reply With Quote
Old 13-09-2009, 00:31   #4
Registered User

Join Date: Jun 2008
Location: Corpus Christi Texas
Boat: boatless atm
Posts: 697
Send a message via MSN to bobfnbw
Bet it felt good to know how your hard efforts paid off.
BTW, that exhaust hose size is your Perkins ?
What hose did you use when you replaced the old hose.
bobfnbw is offline   Reply With Quote
Old 13-09-2009, 01:22   #5
Registered User

Join Date: Aug 2009
Posts: 211
Well done Trekka! There's nothing as satisfying as fixing a problem yourself. Here's to many more hours of cool running!
ColdFusion is offline   Reply With Quote

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 Steve Kidson Engines and Propulsion Systems 58 03-07-2016 12:56
Need: Perkins 4-108 rusconigiorgio Classifieds Archive 11 16-09-2009 09:04
cool running coating Carol Delfaus Construction, Maintenance & Refit 2 09-03-2009 20:10
Looking for used perkins 4-108 sailboatvern Classifieds Archive 8 30-10-2008 18:56
Perkins 4.108 cburger Engines and Propulsion Systems 8 11-05-2006 10:31

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:34.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.