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  Topic Review (Newest First)
10-02-2016 07:54 AM
LinekinBayCD
Re: Premature impeller failure cause

Two years now without an impeller failure. I stopped by the Hansen Marine booth at the Maine Boats and Harbors boat show this past August in Rockland to talk with the Westerbeke rep. Hansen was the distributor from whom I purchased the new 55 for the repower. I had been in contact with him many times over the past years while trying to solve my impeller failures. He wasn't real helpful in the past in trying to fix the problem and and wasn't real interested in hearing how I solved the problem. He seemed to just hoped that I moved along.
10-05-2015 01:48 PM
hellosailor
Re: Premature impeller failure cause

AFAIK Westerbleak [sic] still operates as it always has. It puts out bids for the lowest-cost supplier of everything, and then just slaps 'em together and paints the whole thing red.

So if some engineer said "This pump will work for a year, that's good enough" they would be buying and using the cheapest pumps that met that criteria.

Of course, if Tesla and Dyson got together to manufacture boat engines, we all be sailing strictly with sails, wouldn't we?(G)
10-05-2015 09:44 AM
LinekinBayCD
Re: Premature impeller failure cause

It looks like the larger crank mounted pump has put an end to my premature impeller failure issues. Boat was hauled last week. This is the first year since my repower with the Westerbeke 55 that I did not have an impeller failure. Engine ran slightly cooler and did not tend to get hotter when pushed beyond crushing RPM's. The larger pump w it's a reducing cam pumps about 50% more than the stock pump.

Ultimately my best guess is that the stock pump is at least marginally undersized for the engine. Can't be a bad batch of impellers as I used both Westerbeke and Johnson impellers from a variety of sources over a five year period. Neither Westerbeke or Hansen Marine was of much help in figuring out the problem other than giving me a lot of free impellers over the last five years.
05-27-2015 06:01 PM
LinekinBayCD
Re: Premature impeller failure cause

Quote:
Originally Posted by hellosailor View Post
Engine running at 190F? Did I miss something, or is this a fresh water (or heat exchanger?) boat?

In salt water, if you run over ~150F you will get minerals crystalizing out of the salt water and blocking the engine cooling passages if you are raw water cooled.

FWIW.
Heat exchanger.
05-27-2015 05:59 PM
LinekinBayCD
Re: Premature impeller failure cause

Quote:
Originally Posted by celenoglu View Post
The impeller is designed to work at higer pressures than it is rated, therefore the dimensions of the pipes and hoses are not the reason. The problem is the impeller. The batches might be faulty (Bad luck). If you face the same problem again it is best to drill a hole through the rubber to the bushing and put a short bolt which is not too much higher than the rubber.
Don't think it is bad impeller batches. The impellers that failed were from multiple sources both Westerbeke and Johnson branded and bought over multiple years or provided by Westerbeke / Hansen Marine over multiple years.

The impellers have a pin that fits in a slot in the pump to drive it. I believe they extend in to the rubber a little.
05-27-2015 05:50 PM
LinekinBayCD
Re: Premature impeller failure cause

Quote:
Originally Posted by boatpoker View Post
I have the sam engine. I'd love to see some photos of your mods.
PM me with your email address and I'll email you some pix. Might be quicker than me getting around to posting the pix here.
05-27-2015 04:07 PM
hellosailor
Re: Premature impeller failure cause

Engine running at 190F? Did I miss something, or is this a fresh water (or heat exchanger?) boat?

In salt water, if you run over ~150F you will get minerals crystalizing out of the salt water and blocking the engine cooling passages if you are raw water cooled.

FWIW.
05-27-2015 03:55 PM
celenoglu
Re: Premature impeller failure cause

The impeller is designed to work at higer pressures than it is rated, therefore the dimensions of the pipes and hoses are not the reason. The problem is the impeller. The batches might be faulty (Bad luck). If you face the same problem again it is best to drill a hole through the rubber to the bushing and put a short bolt which is not too much higher than the rubber.
05-27-2015 03:51 PM
boatpoker
Re: Premature impeller failure cause

Quote:
Originally Posted by LinekinBayCD View Post
Fast forward to 2015. After another impeller failure in the summer of 2014 on my Westerbeke 55 I had enough of trying to investigate the cause of the annual failures. I bought a new pump, upgrading from the stock Johnson belt driven F35 to a Johnson F5 crank mount. My yard had an adapter plate fabricated so that the pump could be bolted the adapter plate which in turn was bolted to the crank pulley. The crank mounted pump has the added advantages of eliminating a belt and being 1000% more accessible for changing the impeller. Previously the pump had to be removed in order to change the impeller.
I have the sam engine. I'd love to see some photos of your mods.
05-27-2015 03:40 PM
sony2000
Re: Premature impeller failure cause

I noticed on the Atomic 4 pumps that it was easy to end up with an impeller that is a little too wide for the casing, as well as too narrow. The cams wear down over time, and may even wear out the blades, if they have been damaged.
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