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  #26   IP: 69.206.130.39
Old 06-15-2014, 09:59 AM
JonWannabe JonWannabe is offline
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New Impeller not pumping as much as the old one

I replaced the impeller as a 'just in case'. No issues once I was able to get the old one out. Sadly it seems to be spitting less water than the old one did. I thought I was doing a good deed by putting a bit of lithium grease on the inside of the area thinking it would create less friction on the spinning rubber. Did that mess things up? (good thing I got a spare gasket). Thanks
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  #27   IP: 97.73.48.62
Old 06-29-2014, 10:04 AM
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For Sailalibi post #25: Yes, thanks for asking. All of the current kits will have the new configuration and appropriate instructions. There has been no change to the basic housing. The only change has been to the bearing stop ring on the shaft so as to move the bearings approximately 1/4" to make room for the oil seal on the impeller chamber side of the bearings. Don

Last edited by Don Moyer; 06-29-2014 at 10:07 AM.
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  #28   IP: 206.47.13.123
Old 05-05-2015, 09:13 AM
lhbradley lhbradley is offline
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New MMI pump - impeller replaced - end plate leaks now.

Replaced the impeller on my MMI water pump while it was on the engine. Used some string to bend the blades so it would go in easily, then pulled string out. Guess I didn't get the thing all the way in, since when I install the end plate, I get some leaking. Access is difficult. I tried using a socket against the impeller center part and some light hammer taps - it looks like it is in OK, but still get some leaking around the bottom of the plate. It is safe to hammer the impeller in more (using a piece of wood to protect it? Can I use some liquid gasket gunk on the end plate (outside of the sealing ring? Or should I bite the bullet and pull the pump off to do it?

Thanks
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  #29   IP: 198.11.8.218
Old 05-05-2015, 09:27 AM
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The impeller on the MMI pump usually goes in pretty easily. It's a slip fit on mine. Don't bang on it....

A leak is more likely the result of a missing, or damaged, or pinched o-ring. It's tiny, as in ridiculously teeny tiny. Are you sure it's there? Confirm presence and installation of o-ring. Make sure the mating pump flange is clean.
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  #30   IP: 64.233.172.147
Old 05-05-2015, 10:33 AM
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Quote:
Originally Posted by Don Moyer View Post
We did make this small change in the location of the oil seal in our latest pumps. The oil seal is now on the impeller chamber side of the bearings so that if a lip seal should leak, the raw water will not have direct access to the bearings. Any repair kit bought since this change was made will contain the correct parts and instructions to assemble the pump with the oil seal in the new location. Any questions can be directed to: info@moyermarine.com Don
Bumped.

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  #31   IP: 64.134.236.33
Old 01-29-2016, 01:09 PM
macgyro macgyro is offline
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Which direction to bend the blades of the impeller?

I'm replacing my water pump impeller after an unknown number of hours on the new (to this boat) used engine. I'm curious if the blades in the attached photo are bent in the correct direction? This is my old impeller that I haven't removed yet.

Thanks!
Dean
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  #32   IP: 161.213.49.150
Old 01-29-2016, 01:48 PM
JOHN COOKSON JOHN COOKSON is online now
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Quote:
Originally Posted by macgyro View Post
I'm replacing my water pump impeller after an unknown number of hours on the new (to this boat) used engine. I'm curious if the blades in the attached photo are bent in the correct direction? This is my old impeller that I haven't removed yet.
Thanks!
Dean
Did the pump pump water before you took the face plate off? If so the blades are oriented correctly.
The easy way is to install the new impeller and bump the starter then the blades will orient correctly because the direction that the blades orient is fixed by the direction of engine rotation. (assuming the input and output hoses are not switched!)
If you want to delve into it a little deeper there should be a larger space between the blades when the impeller passes the input opening and a smaller space between the blades pass the output opening thus forcing the water or coolant out of the pump.
You can take it from here. In your next post tell us if the blades are oriented correctly or not in the picture.

TRUE GRIT

Edit: To start a new thread scroll down the on forum home page to "discussion topics". Click on the topic you want. The new thread button will be in the upper left. You'll get more responses if you start a new thread.

Edit #2: If the pump doesn't pump try priming it by pouring down the input hose while holding it vertically into the pump.

Last edited by JOHN COOKSON; 01-29-2016 at 05:42 PM.
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  #33   IP: 24.152.132.65
Old 01-29-2016, 11:10 PM
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Yes, impeller vane direction is correct.
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  #34   IP: 73.239.55.5
Old 09-08-2019, 06:35 PM
JackConnick JackConnick is offline
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Dripping MMI Pedestal Pump

I have a newish (maybe 2-3 year old) MMI Pedestal water pump on my late model A4.

No matter what I do I am getting a steady water drip from the lower thumbscrew area. I've felt around the pump and hoses and it's definitely coming from the lower place on the pump.

I've cleaned it up thoroughly and replaced the oring. Still dripped. Gave up on the oring, and tried copper RTV which usually seals about anything, but it's still leaking.

The oring is stupidly tiny. Is there a paper seal available as well? Better backplate? I'm sort of at a loss to get this fixed right now.

Thanks,
Jack
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  #35   IP: 98.117.4.37
Old 09-09-2019, 07:36 AM
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Leaky MMI pedistal pump

Jack,

It sounds like you may have a small defect in your housing. If you give me a call at (717) 766-8777 I'll see if we can work something out to correct the problem. In the meantime, you may be able to correct the leak by installing a standard back plate gasket, or by cutting a temporary one out of a brown paper bag. Don
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  #36   IP: 12.246.48.58
Old 09-09-2019, 11:48 AM
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Quote:
Originally Posted by JackConnick View Post
No matter what I do I am getting a steady water drip from the lower thumbscrew area.
Could it actually be leaking from the WEEP HOLE and running to the back of the pump?
Did it just start leaking OR was it after a maintenance on the pump and you opened up the back?
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