|
01-19-2020, 08:32 PM
|
#1
|
Senior Member
City: Charleston
Vessel Name: THIRD CHILD
Vessel Model: KADEY KROGEN 48AE
Join Date: Apr 2016
Posts: 114
|
rubber heat exchanger seals on a NL 12kW
Thanks to those that gave input assisting in my first seawater pump replacement.
Change was simple in the end. However there's reduced flow out the wet exhaust so the to check the heat exchanger for impeller vanes pieces.....
1) after hose clamps removed, the rubber seal came off the housing lip with moderate effort, but haven't been able to work if off the narrower segment on the exchanger element. Any tricks besides force? Hoping not to damage the rubber seal.
2) On the exhaust end, did you have to remove the rubber seal from the elbow to get it off the exchanger?
Thanks in advance.
Sandy
|
|
|
01-19-2020, 11:11 PM
|
#2
|
Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
|
Put new boots on each end, they are not that expensive and are critical in separating coolant and sea water. Cut them off if needed to get it apart. Clean tube bundle sealing surfaces to clean metal for new boot install.
|
|
|
01-20-2020, 09:28 AM
|
#3
|
Guru
City: Sea of Cortez, Mexico
Vessel Name: Irene
Vessel Model: Nordhavn 40II
Join Date: Jan 2016
Posts: 1,235
|
Sandy,
There are a few tricks in the linked article, if you were not aware. Please note the recommended order of installation with the new boots, tighten the small side before the big side.
Safe Harbour | Northern Lights Cooling System Maintenance – Slowboat
__________________
Jeff
MV IRENE
|
|
|
01-21-2020, 09:41 PM
|
#4
|
Senior Member
City: Charleston
Vessel Name: THIRD CHILD
Vessel Model: KADEY KROGEN 48AE
Join Date: Apr 2016
Posts: 114
|
Thanks Jeff.
I couldn’t (yet) work the hose off the exchanger tube on the front end.
Will try agin this weekend.
|
|
|
01-21-2020, 10:08 PM
|
#5
|
Guru
City: Sea of Cortez, Mexico
Vessel Name: Irene
Vessel Model: Nordhavn 40II
Join Date: Jan 2016
Posts: 1,235
|
Good luck.
I think I am going to get into my generator this weekend. New mixing elbow, clean the heat exchanger if needed, new coolant, adjust the valves, new fuel filters, new oil and oil filter. I am not looking forward to the mixing elbow job, as there appears to be some sealant between the hose and nipple.
Suggestions welcomed!
__________________
Jeff
MV IRENE
|
|
|
01-25-2020, 08:44 PM
|
#6
|
Senior Member
City: Charleston
Vessel Name: THIRD CHILD
Vessel Model: KADEY KROGEN 48AE
Join Date: Apr 2016
Posts: 114
|
So, just elbow grease got the two caps off.
What are your recommendations to clean the bundle? Clean the face on inflow side?
Fresh water only, barnacle buster? dilute muriatic?
Saw a recommendation for CLR, but CLR labelling says do not use on copper.
Have copper rods ordered to clean the tubes, although none are visually blocked.
|
|
|
01-25-2020, 08:56 PM
|
#7
|
Guru
City: Sea of Cortez, Mexico
Vessel Name: Irene
Vessel Model: Nordhavn 40II
Join Date: Jan 2016
Posts: 1,235
|
I will soak my bundle in Barnacle Buster (at their recommended concentration) if it is needed.
Last time, I had no indication that soaking was necessary, so I didn’t soak. It was also the first time I performed the service since we purchased the boat, and I didn’t have any records indicating it was done previously.
Sounds like you are making great progress. I can’t say I am.
__________________
Jeff
MV IRENE
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Trawler Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
All times are GMT -5. The time now is 06:20 AM.