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  #1   IP: 75.22.48.67
Old 10-01-2011, 12:18 PM
sailmakered sailmakered is offline
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Red face Just installed a new Indigo Thermostat kit and now old water pump does not pump

Hey all,

As the title says I installed a new Indigo thermostat system, nice design. While I played with the cooling system, I removed the water pump to check it out. The pump looked pretty rough. I cleaned it up with a brass wire wheel. The grease cup was full but the nipple on the shaft end was broken & no grease was getting to the shaft. The shaft has grooves like a record(remember those??). I can see the shaft hole in the pump body is egged out and there is probably an 1/8" of shaft play. I tried calling MMI on Friday to get help & order a new MMI pump but they must have taken the day off....good on them

I guess my question is why my pump worked fine when it was cruddy but won't now clean. Tom at Indigo gave me some ideas to try. I ran the pump without the cover gasket; flipped the impeller, one end of the vanes are a little rounded; took the new sea strainer out of the system. Nothing changed.

I have some other ideas to get the system back to pre Indigo level. There is a bit more plumbing on the Indigo system & maybe the old pump can't quite make it.

Any tips or tricks you might have would be much appreciated. Is there a good way to bench test the pump?

Thanks
Steve
'78 Catalina 27
V-drive blocked A-4 of unknown vintage
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  #2   IP: 76.7.137.196
Old 10-01-2011, 12:34 PM
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Marian Claire Marian Claire is offline
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Where are you testing for flow? I would think the best place would be the water pump exit. You can actually prime the pump with that hose disconnected. Have you checked for flow at the thru hull. Dan S/V Marian Claire
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  #3   IP: 107.0.6.243
Old 10-01-2011, 12:44 PM
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hanleyclifford hanleyclifford is offline
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Question

Is this a fresh or RWC system?
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  #4   IP: 75.22.48.67
Old 10-01-2011, 12:51 PM
sailmakered sailmakered is offline
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Originally Posted by Marian Claire View Post
Where are you testing for flow? I would think the best place would be the water pump exit. You can actually prime the pump with that hose disconnected.
I have but only get some water spitting out & I can feel pulsing with my finger over hole.
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Have you checked for flow at the thru hull. Dan S/V Marian Claire
I have gotten plenty of flow from t-hull.
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  #5   IP: 76.7.137.196
Old 10-01-2011, 01:13 PM
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Marian Claire Marian Claire is offline
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Did you pour some water in the pump exit to prime? You will probable need to close the thru hull as it is likely lower than the pump. Do not ask how much water I poured in my pump before that dawned on me. Start the engine and then open thru hull. FWIW. Dan S/V Marian Claire
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Old 10-01-2011, 01:21 PM
sailmakered sailmakered is offline
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Quote:
Originally Posted by Marian Claire View Post
Did you pour some water in the pump exit to prime? You will probable need to close the thru hull as it is likely lower than the pump. Do not ask how much water I poured in my pump before that dawned on me. Start the engine and then open thru hull. FWIW. Dan S/V Marian Claire
I have poured water into both ends but never closed the sea cock I guess it would drain out. I thought these pumps were self priming.
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  #7   IP: 76.7.137.196
Old 10-01-2011, 01:36 PM
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Marian Claire Marian Claire is offline
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Do you have this pump? http://www.oberdorfer-pumps.com/Spec...204%20page.pdf When you wire brushed the pump was that external surfaces only? Dan S/V Marian Claire
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  #8   IP: 75.68.130.228
Old 10-01-2011, 01:43 PM
smosher smosher is offline
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They are not self priming. I remove the intake hose, lift as high as possible, fill the hose then quickly put back on the thruhull.

This usually works,

Steve
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Old 10-01-2011, 01:48 PM
sailmakered sailmakered is offline
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Quote:
Originally Posted by Marian Claire View Post
Do you have this pump? http://www.oberdorfer-pumps.com/Spec...204%20page.pdf When you wire brushed the pump was that external surfaces only? Dan S/V Marian Claire
yes & the cover gasket surfaces....shinned up nice, no gouges.
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Old 10-01-2011, 01:49 PM
sailmakered sailmakered is offline
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Originally Posted by smosher View Post
They are not self priming. I remove the intake hose, lift as high as possible, fill the hose then quickly put back on the thruhull.

This usually works,

Steve
Will give a try & close t-hull until engine is running.
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  #11   IP: 107.0.6.243
Old 10-01-2011, 01:51 PM
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hanleyclifford hanleyclifford is offline
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Impeller pumps are not self priming. What makes them work as a raw water pump is their position below the water line. If the input hose rises above the water line you could have trouble getting a weak pump to work even if you prime from the output side. You may have to cobble a method of priming the input side until your new pump arrives. BTW, 1/8" wobble is huge - I'm surprised it wasn't leaking.
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Old 10-01-2011, 02:22 PM
sailmakered sailmakered is offline
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Quote:
Originally Posted by hanleyclifford View Post
Impeller pumps are not self priming. What makes them work as a raw water pump is their position below the water line. If the input hose rises above the water line you could have trouble getting a weak pump to work even if you prime from the output side. You may have to cobble a method of priming the input side until your new pump arrives. BTW, 1/8" wobble is huge - I'm surprised it wasn't leaking.
Seemed a little excessive. It was leaking a little but pumping ok. Just ordered the MMI pump I'm going to head down to the boat & try some of the priming tips. I hope to have good news to report this evening.

Thanks everyone
Steve
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Old 10-01-2011, 11:29 PM
sailmakered sailmakered is offline
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SUCCESS!!!!!

Put the new impeller in, primed it & all worked. The Indigo system works great. I rode her harder than ever before & the gauge never went above the 135F mark. IR thermometer readings seemed in line as well.

Next is the oil filter & MMI pump installs.

It just never ends....ain't it great!!


Thanks for all the help
Steve
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  #14   IP: 206.125.176.3
Old 10-03-2011, 10:28 AM
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steve, great follow up..glad to see you got it working.

If you ever feel like posting up a few pictures of your V-drive arrangement in the Cat27 I'd love to see them..I have a C-30 with direct drive as the engine is under the galley.
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Old 10-03-2011, 10:53 AM
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FAILURE!!!

Pump was leaking but pumping. Wind got light when outside long beach breakwater yesterday. Lit her up & overheated. Could maintain 140 in neutral but overheat loaded. Drifted slowly to the slip & just used motor for last minute. Pump is finally dead, mmi pump should ship today. Will post some pix.
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  #16   IP: 173.166.26.241
Old 10-03-2011, 11:31 AM
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Quote:
Originally Posted by sailmakered View Post
FAILURE!!!

Pump was leaking but pumping. Wind got light when outside long beach breakwater yesterday. Lit her up & overheated. Could maintain 140 in neutral but overheat loaded. Drifted slowly to the slip & just used motor for last minute. Pump is finally dead, mmi pump should ship today. Will post some pix.
I would be cautious in this situation about blaming only the pump. Check for complications elsewhere while you are intstalling the new MM pump. Something may have broken loose in the block or head and be partially clogging a thermostat passage. It is unusual for a pump with a new impeller to fail so suddenly unless the new impeller lost a vane and sent it to a location where it can do the most harm.
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  #17   IP: 12.219.49.130
Old 10-03-2011, 04:17 PM
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marthur marthur is offline
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I will second Hanley on this. When we rebuilt our water pump some seasons ago, it blasted loose some broken impeller bits. Those had been in the engine for longer than we had owned it, but the still clogged the system up.
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