#1
IP: 70.91.159.1
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MMI FWC Kit Raw water pump pulley alignment
Update 9/11/2011 - As hard as I try I cannot get the pulley that drives the raw water pump to align with the PTO pulley on the fly wheel. As a result, the raw water pulley wobbles - creating enough imbalance and vibration to cause scoring on the shaft by the pins holding the pulley. I know the manual for the MMI FWC kit said it isn't necessary to get them to line up exacty. It's lined up with the PTO pulley, but there is a noticable difference in the angle of the pulleys.
I decided to scrape the whole thing for now because the noise is intolerable and I'm concerned about damaging the pump and the system failing. So farr I can't find where anyone has had difficulty with the system. What am I doing wrong? |
#2
IP: 24.152.131.220
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A misalignment wouldn't result in a wobble. I think you either have a bent pump shaft or a bent pulley.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#3
IP: 12.4.217.34
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Thanks Neil, I was already considering a new shaft because of the scoring on the original one. Might as well get a new pulley as well. I'm also wondering if it's a problem with the PTO pulley (although it seems balanced) or maybe the pump bracket that bolts to the starter.
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#4
IP: 24.152.131.220
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The fact the pulley does not run true tells me it's not a bracket problem. How about some video??
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#5
IP: 12.4.217.34
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Too late, I already removed the pump and reverted back to raw water cooling. But it wouldn't take much to reinstall.
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#6
IP: 24.152.131.220
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Clamp the pump with pulley to the bench, hold a square on the bench top and pulley face and turn the pump by hand. I bet the problem will reveal itself. You might have to block up the pump base to gain pulley clearance.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#7
IP: 12.4.217.34
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Thanks - since i removed the pump and bracket I can run the test quickly and easily. will let you know what I find. The MMI install manual suggested that the bracket may need bending in a vice to get better alignment.
Question - let's assume the pulley is fine - if the PTO pulley is at a 3 degree angle and the pump pulley is mounted at a 2 degree angle, would that cause the wobble? |
#8
IP: 12.4.217.34
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I also notice that the pulley doesn't fit snuggly on the shaft. There is noticable play. The 2 pins provided for the pulley don't give me a lot of confidence and actually seem to be moving around enough to cause scoring on the shaft.
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#9
IP: 24.152.131.220
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Quote:
Both pulleys should run true (no wobble) but the misalignment would wear the sides of the belt and produce black belt dust all over the place. I REALLY have a problem associating the bracket with wobble. The wobble is rotational, the bracket is stationary. edit: noticeable pulley play could be it. Note that my FWC is electric, no PTO pulley and extra pump so I'm talking on principles here rather than direct experience.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others Last edited by ndutton; 09-12-2011 at 08:52 AM. Reason: Added quote for clarity |
#10
IP: 12.4.217.34
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I did see some belt dust, but not much. Think I may try a new pulley and check with MMI to see if I can add some sort of bearing to eliminate any play. What type of electric pump do you use?
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#11
IP: 24.152.131.220
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Here are the two threads that discussed it in detail:
http://www.moyermarine.com/forums/showthread.php?t=5008 http://www.moyermarine.com/forums/showthread.php?t=4778 (posts from #99 on really get into it) To summarize though, the popular electric pump is the rather expensive Johnson CM-30. I used a Ford Mustang supercharger intercooler pump at 1/4 the price and 7% less flow. So far so good.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#12
IP: 12.4.217.34
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Good stuff. Since I've already spent the money on the mechanical pump, I'll try to make it work first but it's good to know there is an alternative.
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