Cruisers Forum
 


Join CruisersForum Today

 
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 12-10-2015, 11:52   #1
Registered User

Join Date: Oct 2015
Posts: 6
Cylindrical heat exchanger for penta md 21b

Part is classed as obsolete by Volvo Penta, so I am looking for a decent sceond hand one which doesn't leak.
__________________

Taff sailor is offline  
Old 12-10-2015, 12:26   #2
Registered User

Join Date: Jan 2015
Location: Florida's Gulf Coast
Boat: Contest 32 CS Ketch
Posts: 126
Re: Cylindrical heat exchanger for penta md 21b

I'm not sure it's the same heat exchanger, but I have one from a Volvo Penta Model 2003.
__________________

Polar Opposite is offline  
Old 12-10-2015, 13:00   #3
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat in La Paz)
Boat: Valiant V40
Posts: 518
Re: Cylindrical heat exchanger for penta md 21b

Fuggetaboutit.

We have one (probably leaking internally) and a spare on our Volvo 2003T. Most of the used ones (ours included) have corroded casings -- which are no longer available from Volvo. Even the tube sheets (which are fairly robust) are on the order of $3000, and at last check there was only 1 new one available.

We had a similar issue with the oil cooler on the 2003T, also no longer available.

We changed out the oil cooler with an inexpensive ($150) after market NiCu unit easily retrofitted, and are in the process of doing the same with the HX. The aftermarket HX, also NiCu, was on the order of $400. Will need to modify two of the original coolant pipes, but a quite simple modification.

May not be an option on some Volvos where the HX is integral with the exhaust manifold.
jamhass is offline  
Old 12-10-2015, 13:53   #4
Registered User

Join Date: Oct 2015
Posts: 6
Re: Cylindrical heat exchanger for penta md 21b

Thanks guys, but I think mine is unique to this engine type. Here's the daigrammatic:Volvo Penta Exploded view / schematic Heat Exchanger with Thermostat and Installation Components MD21B, AQD21B - MarinePartsEurope.com and unfortunately the tube stack on this model is integral, so replacing that is not an option.
Taff sailor is offline  
Old 13-10-2015, 12:22   #5
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat in La Paz)
Boat: Valiant V40
Posts: 518
Re: Cylindrical heat exchanger for penta md 21b

As usual, Volvo keeps the plumbing together mainly by the "geometry" of the part. i.e. the pipes are only held in place by the location of the mating parts, not by threaded or otherwise secured joints.

While this complicates aftermarket replacements somewhat, it is not an insurmountable obstacle. For example, #38 can be secured to #45 by brazing a support link held in by screw #50.

Remember, the aftermarket HX does not HAVE to be mounted on the engine. It could be on a nearby bulkhead. On the other hand, since at least one end is simply clamped to the engine, you might well work up a similar solution for the other end.

I went through an identical exercise with my 2003T. It wasn't all that hard and saved me thousands. Literally. And ... I'm not having to rely on suspect second (or third) hand parts.

I had great success with Lenco.com. Give them a call. When I called with questions, they knew my engine right off the bat, and had just fabricated an HX for another identical engine and knew exactly what I needed. Very satisfied. Note that you don't have to take one of their "stock" HXs. They will modify the plumbing, etc to meet your needs.
jamhass is offline  
Old 13-10-2015, 17:52   #6
Registered User
 
Scout 30's Avatar

Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 2,752
Re: Cylindrical heat exchanger for penta md 21b

I also recommend Lenco. I replaced my 2003T oil cooler with one of there units. Very helpful people to work with.
Scout 30 is offline  
Old 13-10-2015, 17:59   #7
Registered User
 
Scout 30's Avatar

Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 2,752
Re: Cylindrical heat exchanger for penta md 21b

I was watching Jay Leno's Garage the other day & he was explaining how they were saving a fortune by reproducing parts for antique cars using a 3D printer. I immediately thought of my Volvo 2003t. The designs of the oil cooler & heat exchanger are great but the aluminum they made them out of really sucks.
Scout 30 is offline  
Old 14-10-2015, 12:09   #8
Registered User

Join Date: Jan 2015
Location: Florida's Gulf Coast
Boat: Contest 32 CS Ketch
Posts: 126
Re: Cylindrical heat exchanger for penta md 21b

I have a Volvo 2003 and the HX is heavy NiCu, I think. Same with an older Volvo 2003 I took apart. Aside from old rubber gaskets (easily re-made from NAPA rubber sheet gasket material), they were essentially untouched by 30+ years of use. One had the bracket break off, but it was a $40 braze job to get it reattached.

2003Ts have aluminum HX?
Polar Opposite is offline  
Old 14-10-2015, 12:14   #9
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,921
Re: Cylindrical heat exchanger for penta md 21b

In addition to Lenco, try Sendure.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline  
Old 14-10-2015, 12:46   #10
Registered User
 
Scout 30's Avatar

Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 2,752
Re: Cylindrical heat exchanger for penta md 21b

Quote:
Originally Posted by Polar Opposite View Post
I have a Volvo 2003 and the HX is heavy NiCu, I think. Same with an older Volvo 2003 I took apart. Aside from old rubber gaskets (easily re-made from NAPA rubber sheet gasket material), they were essentially untouched by 30+ years of use. One had the bracket break off, but it was a $40 braze job to get it reattached.

2003Ts have aluminum HX?
The 2003T casings for the HX & oil cooler are aluminum. The tubes appear to be brass. To be fair my heat exchanger is fine but the oil cooler looks like termites ate it. Luckily it started leaking at the dock & I caught it before it lost too much oil but if I had been out it could have killed the engine.
Scout 30 is offline  
Old 15-10-2015, 12:43   #11
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat in La Paz)
Boat: Valiant V40
Posts: 518
Re: Cylindrical heat exchanger for penta md 21b

Quote:
Originally Posted by Scout 30 View Post
The 2003T casings for the HX & oil cooler are aluminum. The tubes appear to be brass. To be fair my heat exchanger is fine but the oil cooler looks like termites ate it. Luckily it started leaking at the dock & I caught it before it lost too much oil but if I had been out it could have killed the engine.
The tube sheet is copper -- both in the HX and oil cooler. As such they are susceptible to corrosion especially if not kept clean, as contaminants will cause enough conductance between the Cu and Al that the Al just "goes away ..." And no, they do not have a zinc. Guess Volvo thought this was where they could make some $$$ on replacement parts.
jamhass is offline  
Old 15-10-2015, 13:19   #12
Registered User
 
Scout 30's Avatar

Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 2,752
Re: Cylindrical heat exchanger for penta md 21b

Quote:
Originally Posted by jamhass View Post
The tube sheet is copper -- both in the HX and oil cooler. As such they are susceptible to corrosion especially if not kept clean, as contaminants will cause enough conductance between the Cu and Al that the Al just "goes away ..." And no, they do not have a zinc. Guess Volvo thought this was where they could make some $$$ on replacement parts.
I wonder if there's a way to drill & tap the heat exchanger for a pencil zinc? All it needs is a zinc to solve the problem.
Scout 30 is offline  
Old 15-10-2015, 18:38   #13
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat in La Paz)
Boat: Valiant V40
Posts: 518
Re: Cylindrical heat exchanger for penta md 21b

Quote:
Originally Posted by Scout 30 View Post
I wonder if there's a way to drill & tap the heat exchanger for a pencil zinc? All it needs is a zinc to solve the problem.
No room.

I've had mine apart, and there is nowhere to put any kind on zinc, at least not pencil zincs.

I finally just went after market, both HX and oil cooler. From Lenco as I see you did too, at least for the oil cooler.
jamhass is offline  
Old 18-10-2015, 14:54   #14
Registered User

Join Date: Oct 2015
Posts: 6
Re: Cylindrical heat exchanger for penta md 21b

Thanks for all the comments and advice and sorry I've been a bit slow in replying but I've been in hospital having knee surgery.

I think the way to go for me is to mount a similar sized HX on a bulkhead and fix rubber hoses on to the metal sleeves which provide the joint between my HX and the cylinder head. I'm based in the UK and postage from the USA of such a heavy item is likely to be expensive, so I'm researching UK based suppliers at the moment.
__________________

Taff sailor is offline  
 

Tags
cal, heat exchanger, penta

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Heat exchanger Volvo Penta, how to mount? jesperht Engines and Propulsion Systems 2 16-09-2013 07:46
Which Heat Conductive Material to Boost My Exhaust Heat Exchanger? Exhaust Shanaly Plumbing Systems and Fixtures 4 05-07-2013 03:58
Want To Buy: Volvo Penta 2003T Heat Exchanger corlfoot Classifieds Archive 0 12-10-2012 20:07
For Sale: Volvo Penta MD-21b Diesel Engine - 45 HP Rhythm Classifieds Archive 4 04-09-2012 09:51
Cylindrical Solar Panels Pelagic Electrical: Batteries, Generators & Solar 7 26-04-2011 09:06



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:35.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.