Big shoutout to Lenco Coolers!

[brettportzer]

Super easy to deal with, and lots of info on their website. They are apparently the OEM for J&T, Jesse said they have been building them for 50 years.
I decided to replace both fuel coolers on my JT6-71Ns and as with so many things, neither of the coolers currently installed was optimal.
Lenco built me a version of the JT2631 cooler with custom OD water connections to match the copper piping and allowed me to specify the fuel fitting NPT size as well.
Even more amazing, I ordered these last Thursday and received them today.
No extra charge for the slight customization and amazing service and a little shop talk / advice.

 

[cww]

Lenco has become a major manufacturer of all sorts of general marine parts these days. I used their trim tabs on my Chris Craft and was very happy.

 

[brettportzer]

I don’t believe that to be the same outfit, btw.

Lenco Coolers - marine heat exchangers, marine oil coolers

LENCO, your #1 source for replacement marine heat exchangers and oil coolers, has been the quality and performance leader since 1972. LENCO - In Stock and Priced Right!

lencocoolers.com

 

[brettportzer]

Lenco: Marine Heat Exchangers and Oil Coolers, Factory Direct.

Lenco has been manufacturing the highest quality marine coolers since 1972. Direct replacement heat exchangers for Mercruiser, Cummins, Crusader, and many more

lencoheatexchangers.com

 

[Pascal]

I used them to get a heat exchanger for my norpro gen a few years ago. Fast and reasonable

 

[sparky66]

I never understood having full flow through that small fuel cooler. The water passage area is so much smaller than the main heat exchanger. That has to result in less overall flow.

 

[brettportzer]

I never understood having full flow through that small fuel cooler. The water passage area is so much smaller than the main heat exchanger. That has to result in less overall flow.

What do you mean?
I had two coolers on the boat, the original style where they take a 1" split at the raw water pump and go in and out of a smaller cooler on the way in to the heat exchanger. This made complicated plumbing and extra long fuel hoses, compared to the other engine, which had been switched to this style of cooler on the outlet side of the heater exchanger.
But, that cooler was not optimal either, it was a different style with no zincs and without the small tubes style heat exchanger stuff inside.
So, I upgraded them both to this style which seems a good mix of form and function to me.

 

[sparky66]

What do you mean?
I had two coolers on the boat, the original style where they take a 1" split at the raw water pump and go in and out of a smaller cooler on the way in to the heat exchanger. This made complicated plumbing and extra long fuel hoses, compared to the other engine, which had been switched to this style of cooler on the outlet side of the heater exchanger.
But, that cooler was not optimal either, it was a different style with no zincs and without the small tubes style heat exchanger stuff inside.
So, I upgraded them both to this style which seems a good mix of form and function to me.

That is different from my J&T 6-71N's. Coming out of the water pump, the approximate 2" diameter pipe makes 90 degree turn towards the front of the engine and almost immediately hits the fuel cooler. This works well to catch impeller parts. It then goes to the main heat exchanger, which is has about a 3-1/2" opening. I always thought that most of the raw water should bypass the fuel cooler, and it looks like some engines were like that.

 

[brettportzer]

Yea mine was originally that the raw water output splits out of the pump into two 1" hoses, one going to the fuel cooler and then to the heat exchanger, and then the other one straight to the heat exchanger. So the heat exchanger raw water input fitting is two 1" connections. Then the output is a single 2".
Seems overly complicated to me.

 

[Avenger]

Lenco is almost literally in my back yard. Great product, great people to deal with.

https://imgur.com/RKQjdrC

Ignore the pallet. They've got a lot of stuff going in and out.

 

[Bob Bradley]

I believe I sourced a heat exchanger for my Chris Craft Seaskiff's 327F engines back in the late 90's. Identical to the original 1965 unit.