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Old 02-13-2021, 04:33 PM   #1
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Nick F's Avatar
City: Vancouver
Vessel Name: L'Attitude (previously Khenko)
Vessel Model: CHB 34 1976
Join Date: Sep 2020
Posts: 75
Raw water pump cover - using the second side

I am getting to know my new (to me) 1976 boat. I am rebuilding the (Johnsen F5B) raw water impeller pump and the inside face of the cover is badly worn (see photo). Since the face of a new cover is just flat, it occurred to me that all I needed to do was to install the cover with the worn face to the outside. Not so easy! The manufacturer has stamped his (her) name etc. on the outside of the cover (see photo).

I thought about sanding the face smooth but it could be a lot of sanding and it is important that the surface be flat. Our friendly machinist at work helped me out and skimmed off 0.012"(twelve thousandths) - and I am set to go!! (see photo)

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Raw cover - worn.jpg   Raw cover machined2.jpg  
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Old 02-16-2021, 08:56 AM   #2
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City: Colonial Beach, VA
Vessel Name: Tatoosh
Vessel Model: 1979 49ft Marine Trader RPH
Join Date: Jun 2019
Posts: 226
I found mine flipped round by the PO, for no reason. It was using the engraved surface inside the pump with the impeller riding on it. Actually, it worked just fine like that. I only turned it back around because I am OCD.

"Everything on your boat is broken.... You just don't know it yet."
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Old 02-16-2021, 09:24 AM   #3
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City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 5,116
I have flipped mine. Just polish off any burrs from markings with fine wet & dry.
2008 MS 34 HT Trawler
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Old 02-16-2021, 10:36 AM   #4
Pete Meisinger's Avatar
City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 2,068
They are made to be reversible.

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Old 02-17-2021, 07:23 AM   #5
FF's Avatar
Join Date: Oct 2007
Posts: 21,923
Flat is the key , folks that travel should stop at any big glass store and see if they will trim a busted piece of 1/2 or thicker plate glass to a modest size and trim the edges.

Now any piece of emery cloth and some rubbing can refresh a true flat surface.
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