Originally Posted by NightHawk (Post 4632572)

Back on the water and running good with no leaks. Engine temps are steady at 160 when running now. Lots of stuff to change with that job.

At least 5 tubes on the heat exchanger were blocked by small pebbles. I had to dislodge them with a .17 caliber rifle cleaning rod (.22 is too fat). I would never have seen them without removing the exchanger, both end caps and looking down each tube. Crossover to water pump seal was also damaged and the retainer screws were seized. That was fun.

Originally Posted by Sydwayz (Post 4632583)

Just saw this; when you reassembled...
I assume you replaced both of the heat exchanger end cap gaskets, as well as the grommets from the h/e to the crossover, right?
Both can cause problems as they age.

Originally Posted by Ryan00TJ (Post 4632585)

Good to hear. Yep it's amazing what gets into the HE tubes. Compressed air also cleans them out really nicely. While winterizing I pull the endcaps, blow out HE, backflush seawater side cooling system. Those retainer screws are always seized it seems. Dissimilar metals/antiseize is your friend.