Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-19-2019, 03:35 PM   #1
Member
 
City: Pine Knoll Shores, NC
Country: USA
Vessel Name: Hail Mary
Vessel Model: Sterling Yachts Atlantic 45
Join Date: Jun 2018
Posts: 20
After Cooler Maintenance: Cummins QSB 5.9

I am posting to share the importance of doing the above maintenance whether you have a Cummins or other turbo engine with an after cooler. I had planned to do this at 1000 hours, then came onto Tony Athens' article on "marine age" and realized that my 2006 boat had and after cooler that has had seawater in it, since it was launched!

While I did not find some of the terrible things that neglect can create in this component, I did see the start of seawater intrusion onto the air side of the core and corrosion building up around that o-ring (the bottom, where the seawater sits when engine isn't running).

I always noticed that the lower zinc got eaten up much quicker than any of my other engine zincs (upper after cooler and heat exchanger) and this is likely due to the fact that water sits in that pool always. So...check this zinc every 2-3 months and replace more often as needed.

My after pictures are exactly as shown in Tony's excellent video on how to clean (brake fluid on the air part, simple green on the water side after clearing tubes with a rod, then soak entire core in bucket of simple green to loosen up anything else, rinse, dry, done).

links to my research prior to this job, which I will now do every 2-3 years;

use the recommended grease...
https://www.sbmar.com/articles/cummi...r-maintenance/

check which o-ring size to use on the QSB
https://www.sbmar.com/articles/b-ser...dentification/
__________________
Advertisement

pattormey is offline   Reply With Quote
Old 04-19-2019, 04:09 PM   #2
Guru
 
Fletcher500's Avatar
 
City: So-Cal
Country: USA
Vessel Model: Helmsman 43 PH
Join Date: May 2016
Posts: 1,015
I believe Tony called out a lack of lube on the O Ring at the factory assembly for the AC which allowed the salt water to bridge across as a primary reason, but I haven’t read the article in a few years so correct me if wrong. 13 years is a long time to wait. 3 to 5 years is a better interval.
__________________

Fletcher500 is offline   Reply With Quote
Old 04-19-2019, 04:11 PM   #3
Guru
 
Rebel112r's Avatar
 
City: Birch bay wa
Country: USA
Vessel Name: Rogue
Vessel Model: North Pacific 42
Join Date: Feb 2013
Posts: 547
Following TAs recipe, I did mine about a year after buying current boat. Getting exchanger out of housing was a chore. It was not plugged up, nice clean tubes, but stuck in housing. After service following SBAR, procedures it has run 3 seasons. Disassembled for service recently, all good again and exchanger, slid easily from housing. If access is good, it is a pretty easy chore.
Rebel112r is offline   Reply With Quote
Old 04-19-2019, 04:13 PM   #4
Member
 
City: Pine Knoll Shores, NC
Country: USA
Vessel Name: Hail Mary
Vessel Model: Sterling Yachts Atlantic 45
Join Date: Jun 2018
Posts: 20
you are exactly correct. I've only have this boat 1 year, so trying to "catch up" on all that should have been done by previous owner...
pattormey is offline   Reply With Quote
Old 04-19-2019, 05:24 PM   #5
Guru
 
Maerin's Avatar
 
City: East Coast
Country: USA
Vessel Name: M/V Maerin
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 687
Quote:
Originally Posted by pattormey View Post
My after pictures are exactly as shown in Tony's excellent video on how to clean (brake fluid on the air part, simple green on the water side after clearing tubes with a rod, then soak entire core in bucket of simple green to loosen up anything else, rinse, dry, done).

I did see his site some time ago- now I didn't go back to the video, so correct me if I'm wrong here, but I believe that he's using brake cleaner and not brake fluid for cleaning the soot from the air side of the cooler.




This stuff should be in every boat fixer's inventory.
__________________
Steve Sipe
Selene 4303 Maerin
http://maerin.net
Maerin is offline   Reply With Quote
Old 04-20-2019, 05:07 AM   #6
Member
 
City: Pine Knoll Shores, NC
Country: USA
Vessel Name: Hail Mary
Vessel Model: Sterling Yachts Atlantic 45
Join Date: Jun 2018
Posts: 20
You are correct. I will edit my original post.
pattormey is offline   Reply With Quote
Old 04-27-2019, 10:04 PM   #7
DDW
Guru
 
City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 752
I just did mine, be aware that there are two different size O-rings that may be used in that aftercooler. You can put the big one in where the small one belongs and get it back together (the PO of mine did) but the results aren't good. Somewhere around 2006 they changed over from the large to the small. You cannot depend on quickserve.cummins and your serial number or the parts counter for this - mine were clearly called out by serial number as the wrong ones. If you look deep enough there is a Cummins tech note explaining this.

Also, Cummins gets $45 for a standard dash 250 O ring, about one or two dollars anywhere else.
DDW is offline   Reply With Quote
Old 04-28-2019, 05:47 AM   #8
Member
 
City: Pine Knoll Shores, NC
Country: USA
Vessel Name: Hail Mary
Vessel Model: Sterling Yachts Atlantic 45
Join Date: Jun 2018
Posts: 20
O Ring Size

Quote:
Originally Posted by DDW View Post
I just did mine, be aware that there are two different size O-rings that may be used in that aftercooler. You can put the big one in where the small one belongs and get it back together (the PO of mine did) but the results aren't good. Somewhere around 2006 they changed over from the large to the small. You cannot depend on quickserve.cummins and your serial number or the parts counter for this - mine were clearly called out by serial number as the wrong ones. If you look deep enough there is a Cummins tech note explaining this.

Also, Cummins gets $45 for a standard dash 250 O ring, about one or two dollars anywhere else.
Not to worry, as Tony Athens provides the photos and the explanations in my links above.
pattormey is offline   Reply With Quote
Old 04-28-2019, 06:07 AM   #9
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 4,604
I did the service on a pair of QSC engines, so probably similar.


I think the point of the grease is to make disassembly easier the next time you service them. If the coolers have not been greased and not been apart for a long time, getting them apart can be a problem.
__________________
www.MVTanglewood.com
twistedtree is offline   Reply With Quote
Old 04-28-2019, 09:03 AM   #10
Arc
Veteran Member
 
City: Long island
Country: U S
Vessel Name: Riverwind
Vessel Model: Eastern
Join Date: Aug 2018
Posts: 48
Look what I found on a 250 hour QSB. And the boat was serviced by highly regarded boat yard.
Click image for larger version

Name:	225E8888-E8B5-421E-A7D5-BF5D9AE83FC9.jpg
Views:	51
Size:	105.4 KB
ID:	87980
__________________

Arc is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 06:24 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012