M5424 Heat Exchanger


Junior Member
Aloha Captains...

After reviewing articles about engine overheating...my doesn’t...yet...I’m looking to upgrade my h/ex from the 2” to the 3”.

Have any of you found a need to do this on the Univ. 5424?

S/V Mauka Makai
1980 Ericson 35 MK2

Keith Parcells

Sustaining Member
It’s 40 year old, the 3” version is superior, so, yeah, I would change it out.

Search here and you will find several threads about that change. I’ve seen Mr. Cool listed as a supplier In some of those threads.


Sustaining Member
My 5424 ran fine in Santa Barbara, CA for 30 years with the original 2 inch H/E. It wasn't so happy with 85 degree summer Bay water after I moved it to Annapolis. A new three inch NiCu Seakamp H/E from Mr. Cool has kept temperatures at 180 ever since.



Junior Member
Thank you, Mark.

My boat spent most of its sailing life in Washington and later Vancouver, but calls home Hawaii - so definitely a temp variance.