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Message |
    
robert longworth
New member
Username: rlongwor
Post Number: 1
Registered: 09-2012
| | Posted on Wednesday, December 12, 2012 - 02:15 pm: | 
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I have a P60 in my Columbia 34 and this summer it was running perfectly. I noticed it was beginning to overheat and the waterflow seemed low so I checked the impeller and it was in pieces. I fished several pieces out at an elbow just after the pump but more may have got through. Also when I inspected the pump further, the piece of metal that compresses the blades near the exhaust port had cracked and a small chunk after the blade passes the exhaust port had fallen off.
Is there a way to check and see if the flow is blocked or if I need a water pump rebuild. The missing piece is after the impeller blade passes the exhaust port. I also have raw water running thru my steam vent hose when the engine is running. I thought I remembered reading about hooking a gardenhose in lieu of the water pump. Will that work and are there any precautions?
Thanks for any info!
First Post |
Richard A. Day Jr.
Senior Member
Username: richardday
Post Number: 1036
Registered: 11-2003
| | Posted on Monday, December 17, 2012 - 04:59 pm: |
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Robert, Sorry about the delay in answering you. The typical cooling water pump is either a JABSCO or Sherwood. They look almost the same and function the same. The pumping action is determined by a typically plastic ramp at the top of the pump water chamber. It is held in place by a single brass screw at the top of the pump. If the plastic ramp isn't held in place there can be no pumping action. As the pump rotates the flexible vanes open as they descend from from the high point on the ramp causing a suction to be placed on the inlet water connection. As the impeller rotates the vanes full of water on the impeller rotate up the ramp on the discharge side of he pump the water is blocked from the inlet area and forced out the discharge port on the pump. I have seen faulty pumps where the ramp mounting screw has been removed and the ramp rotates with the impeller and water pumping stops. It sounds to me like your impeller and the ramp must have broken up. Simple to fix but make sure the securing screw for the ramp does not penetrate into the new impeller as it crosses the top of the ramp as it will destroy the impeller. Incidentally I have never seen a metal ramp but that doesn't mean there are none.
The steam vent hose should be checked to make sure is clear and any water, air or steam is free to flow other wise the water in the upper portion of the head and along the cylinder water can be forced down due to any air or steam build up in the water jacket. Check it at least once a year to make sure it is not blocked at either end. |
robert longworth
New member
Username: rlongwor
Post Number: 2
Registered: 09-2012
| | Posted on Friday, December 21, 2012 - 12:31 pm: |
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Thanks for replying. I dont get to check the forum as much as I would like to either. My pump is a sherwood and from what you described, I dont think mine is drawing water in. It may be losing prime at the point where the ramp is broken. Since my pump is probably the original pump (1974) I will most likely replace it rather than rebuild. Any recommendations on where to order from? |
Richard A. Day Jr.
Senior Member
Username: richardday
Post Number: 1037
Registered: 11-2003
| | Posted on Friday, December 21, 2012 - 07:43 pm: |
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I may have a useable Sherwood. Will have a look in a couple of days. |
robert longworth
New member
Username: rlongwor
Post Number: 3
Registered: 09-2012
| | Posted on Tuesday, September 17, 2013 - 03:46 pm: |
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Finally got it together and bought a new ramp and impeller for my pump. Installed it, got the carb rebuilt because it sat so long with E10 in it. Emptied the gas tank, put new fuel filters in and it cranked up and idled perfectly. Spent last weekend cruising up and down the ditch behind Myrtle Beach SC. Thanks for the response. I did not realize the impeller actually pulled water in. |
