elbow

Hi all, In my recently bought Hunter 33, while checking the engine I saw that the mixing elbow got rust on it, to my that is strange as the elbow was replaced in 2020 and the engine was serviced by OEM Yanmar service partner in February this year, I really wonder that the engine would have...

About 2+years ago I fitted an SS U-MIXING Elbow bought from eBay. First year check, I reported the U elbow to be in great shape and no rust build up whatsoever. Now pass 2nd year, I've checked the U elbow and glad to report that it's still as clear of any rust or fouling. Totally as good as new!!

Glad to report that after 1 year (~120hrs) running, the eBay SS U Mixing elbow shows no sign of corrosion or fouling. All i found was some layer of carbon. I know I've micro-soot bubble issue but that from engine itself. Normally after a year with Yanmar stock U Mixing elbow there'll be some...