Sharing QSB 5.9 Freshwater Flush Zincs

[Bill Desmarais]

Hello forum members,

I figured I’d share the pictures of the three zincs removed from the QSB 5.9 480 after a five month summer season up here in Kittery Maine.

I was diligent in freshwater flushing the engine after each use. Total hours on the season was +- 150 hrs. burning 4 gal/hr on the season.

From L to Right:

Bottom of after cooler…..Top of aftercooler….Heat exchanger.

Note the degradation in the bottom aftercooler zinc…this one and the heat exchanger zinc sits in the “raw water soup” more so than the top of the aftercooler zinc.

Regards, BillD

Topic

[Bill Desmarais]

100% freshwater hose blasting away through the T adaptor with engine seacock “closed in the video” and engine running. About halfway through the season I flushed with seacock “open”. It was a bugger reaching down and closing the 2″ seacock and then re-opening.

I also think the zincs look normal.

Prop shaft & rudder zincs (Godfrey brand, not cheap Camps) about 70% consumed, no complaints.

The proof of the results will be seen when I service the after cooler after three full season of usage. 

Stay tuned. 

[Tony Athens]

Looks about normal to me..

How good is your flush? 100% fresh water   left in the system?

[Byron Biggs]

dont have a lot of “zinc” experience but erosion seems excessive for just 5 months.  Seems like you could have some kind of stray electrical issue at your dock.

[Author]

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