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Upon replacement of gear oil coolers on early model 6bta 370’s (1.5″ coolers) we found badly deteriorated barbs in the coolers feeding the dripless shaft seals. One was cracked almost in half inside the hose. Based on the nature of the deterioration, it appears they were brass and they dezincified. I would like to use bronze instead since the bodies are also bronze, but I am having a really hard time finding bronze barbs in that size. What is common practice for selecting a material for this barb? I would think a high temp plastic like polysulfone would be sufficient however I’m not a fan of plastic fittings anywhere in a raw water circuit, let alone directly threaded into a cooler. Brass would likely dezinc itself and rot away again. Stainless would pose the threat of galvanic issues in an expensive brand new cooler.Ā Thoughts? common practices? source for a bronze nipple that fits that someone has maybe already found? searching online has produced nothing but brass and larger than 1/2″ mpt bronze fittings.Ā Thanks in advance. -Jay
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Small “bronze” type hose barbs areĀ basically “un-findable”… Common yellow brass today is good for 2-3 yrs.. Just change them every 2 yrs or so if you do not fresh water flush. Sure,Ā modern engineering plastics are good as long as the install is proper and safe.
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