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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #1  
Old 01-22-2013
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Raw Water Pump Impeller

A couple years ago when I replaced my Yanmar raw water pump impeller, I smeared some marine grease on it. The impeller has done well, even ran it dry by accident twice for a short time and had no damage. I have read to smear with vasoline. Realize the wrong grease may attack the rubber impeller or soften it. Getting ready to replace the impeller again.

Any comments? Do you use any grease?

Regards
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Old 01-22-2013
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Re: Raw Water Pump Impeller

I use dishwasher soap.

When testing to make sure it is in right that makes it easy - look for suds behind the boat.
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Old 01-22-2013
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Re: Raw Water Pump Impeller

Most impellers come with a packet of lube, (glycerin) and the instructions say to not lube with anything else. That's what I do and have never had a problem.
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Old 01-22-2013
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Re: Raw Water Pump Impeller

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Originally Posted by jrd22 View Post
Most impellers come with a packet of lube, (glycerin) and the instructions say to not lube with anything else. That's what I do and have never had a problem.
Yanmar does not provide any lube, just a bare impeller.
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Old 01-22-2013
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Re: Raw Water Pump Impeller

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Originally Posted by chucklesR View Post
I use dishwasher soap.

When testing to make sure it is in right that makes it easy - look for suds behind the boat.
I was thinking somthing that might last a little longer instead of washing right out. I'll see what the water proof marine grease looks like when I take the old impeller out, but it seems some water proof grease might permit a few accidental dry runs (or maybe when you suck in some debris that stops the cooling water), instead of toasting the impeller right away.
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Old 01-22-2013
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Re: Raw Water Pump Impeller

You don't need anything. You could assure that there is water at the pump, and I know someone who pumps water to it, but most rw pumps are below the waterline anyway.
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Old 01-23-2013
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Re: Raw Water Pump Impeller

Petroleum based lubes should not be used on impellors although, in most cases, they wash out very quickly and so are of little consequence. Silicone grease, however, can be very durable.

I find it is easier to install an impeller when it is, itself, dry and un-greased. I do this using a rubber band doubled around the vanes, which can be folded back slightly (in the correct direction of course). A little silicone grease on the impeller drive shaft and applied to the inside faces of the pump body will make it easy to slip the impeller in place. Once the vanes are partially enclosed within the pump body, the rubber band can be snipped and removed. With that, I use a Q-tip to apply a little silicone lube to the vanes themselves and the inside face of the cover.

With the foregoing technique, I find that our impellers last very well and even after a year or more, look as new (although we do replace them about every 12-13 months to keep on the safe side).

FWIW...
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Old 01-24-2013
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Quote:
Originally Posted by svHyLyte View Post
Petroleum based lubes should not be used on impellors although, in most cases, they wash out very quickly and so are of little consequence. Silicone grease, however, can be very durable.

I find it is easier to install an impeller when it is, itself, dry and un-greased. I do this using a rubber band doubled around the vanes, which can be folded back slightly (in the correct direction of course). A little silicone grease on the impeller drive shaft and applied to the inside faces of the pump body will make it easy to slip the impeller in place. Once the vanes are partially enclosed within the pump body, the rubber band can be snipped and removed. With that, I use a Q-tip to apply a little silicone lube to the vanes themselves and the inside face of the cover.

With the foregoing technique, I find that our impellers last very well and even after a year or more, look as new (although we do replace them about every 12-13 months to keep on the safe side).

FWIW...
I use wire ties instead of the rubber band but do everything else the same. Works very well.
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Old 01-24-2013
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Re: Raw Water Pump Impeller

Quote:
Originally Posted by svHyLyte View Post
Petroleum based lubes should not be used on impellors although, in most cases, they wash out very quickly and so are of little consequence. Silicone grease, however, can be very durable.

I find it is easier to install an impeller when it is, itself, dry and un-greased. I do this using a rubber band doubled around the vanes, which can be folded back slightly (in the correct direction of course). A little silicone grease on the impeller drive shaft and applied to the inside faces of the pump body will make it easy to slip the impeller in place. Once the vanes are partially enclosed within the pump body, the rubber band can be snipped and removed. With that, I use a Q-tip to apply a little silicone lube to the vanes themselves and the inside face of the cover.

With the foregoing technique, I find that our impellers last very well and even after a year or more, look as new (although we do replace them about every 12-13 months to keep on the safe side).

FWIW...
I use the same technique.

I also make replacing the impeller one of my spring recomissioning checks every year. Peace of mind as I dont want one to ever come apart and get in the engine and heat exhanger.
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Old 01-24-2013
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Re: Raw Water Pump Impeller

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Originally Posted by chef2sail View Post
I use the same technique.

I also make replacing the impeller one of my spring recomissioning checks every year. Peace of mind as I dont want one to ever come apart and get in the engine and heat exchanger.
In another thread on raw water pumps (I believe), one contributor suggested installing a raw water strainer between the output side of the pump and the anti-siphon valve or heat exchanger as a means of preventing the bits and pieces of a failing impeller reaching the heat exchanger. There could be some merit to using something like the following:



By removing the labels etc. one could also see what, if anything, is getting through the pump without breaking any of the seals. My only question would be whether this might slow the flow through the system too much.

FWIW...
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