Expansion Tank broken hose fitting

[Jim Gabilanes]

I have the 1998 Diamond 450’s with the blue metal expansion tank. During my routine checks below, I noticed the black hose from the plastic overflow tank, was disconnected from the fitting just under the cap on the expansion tank. Upon closer inspection, the metal hose fitting was broken off. With some Rescue tape, I was able to keep it in place and ended up with a small leak for the ride home.
What is the recommended fix?

Topic

[Tony Athens]

Logan,

Unless your are an extremely competent and experienced guy with soldering, this is a very difficult piece to install…………………..You are dealing with thin brass and 14 Gauge steel sheet with many lbs of mass vs. 1-2 ounces of thin brass.

Solder– 95-5 would be my choice.

[Logan Zember]

What kinda solder should I use use for a whole neck replacement

[Anonymous]

Hi Jim,

Simplest fix is to, when you have some down time, drain the coolant and remove the expansion tank. The fill neck can be removed and the fitting re-soldered or a new one can be soldered on.

Cummins Marine Replacement Filler Neck

Be sure to inspect all of the other fittings and the inside and outside of the tank to ensure there are no other eminent failure points and everything is clean.

New tanks can be expensive and hard to find.

Thanks,
Kevin

1 user thanked author for this post.

Logan Zember

[Author]

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