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question about impellers
#13549480
05/07/20 10:49 PM
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Joined: Jul 2006
Posts: 2,507
dogsdad
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jul 2006
Posts: 2,507 |
I run a 1991 Mercury 135-horse motor. It's been very reliable since we bought the boat back in about 2003. I had to change the impeller last weekend because the motor would run a little too hot intermittently last time out on the water. When I removed the old impeller from the water pump housing, it was still in good shape as far as flexibility goes, but it had taken an obvious eccentric set and I could easily see why the water pump was not keeping the motor cool. I rebuiilt the water pump, changed out the poppet valve and both thermostats, and zipped it all up before adding a bit of lower unit oil. I ran it in the driveway a little while and all is well.
Then a while ago the idea popped into my head---why not just flip the impeller over and run it the other direction for a season or two? If the rubber is or seems to be in good condition, why not? Has anyone ever done that routinely? Has anyone tried it and wished they hadn't?
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Re: question about impellers
[Re: dogsdad]
#13549546
05/07/20 11:45 PM
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Joined: Feb 2006
Posts: 3,773
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,773 |
Bad idea, reverse direction will surely crack/break the fins. Best to change every 2 years regardless of use, very small price compared to engine replacement.
Last edited by bronco71; 05/07/20 11:46 PM.
1987 Nitro MX185/Mercury Black Max 150 1999 Triton TX21/225 Mercury Optimax
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Re: question about impellers
[Re: bronco71]
#13549660
05/08/20 01:22 AM
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Joined: Jul 2006
Posts: 2,507
dogsdad
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jul 2006
Posts: 2,507 |
Bad idea, reverse direction will surely crack/break the fins. Best to change every 2 years regardless of use, very small price compared to engine replacement. I agree with you in your belief, but I would like to find out what anyone KNOWS...as in, voice of experience.
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Re: question about impellers
[Re: dogsdad]
#13549661
05/08/20 01:23 AM
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Joined: Oct 2012
Posts: 1,925
smooth move
Extreme Angler
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Extreme Angler
Joined: Oct 2012
Posts: 1,925 |
i dunno. i kinda like that idea. only thing is that if you're taking it apart anyway, why not just put a new one in and relieve any doubt.
es le bon ton roulet
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Re: question about impellers
[Re: dogsdad]
#13549757
05/08/20 02:44 AM
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Joined: Jan 2005
Posts: 17,017
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 17,017 |
The impeller is designed to.seal off the top of the housing. Your key slot won't fit right and itll.just pour.water into.the.exhaust and not up.the water tube.
That's from experience.putting one upside down..
Pat Goff Seadrift TX
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Re: question about impellers
[Re: smooth move]
#13549789
05/08/20 03:13 AM
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Joined: Jun 2011
Posts: 2,235
Jimfishes
Extreme Angler
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Extreme Angler
Joined: Jun 2011
Posts: 2,235 |
i dunno. i kinda like that idea. only thing is that if you're taking it apart anyway, why not just put a new one in and relieve any doubt. THIS.....
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Re: question about impellers
[Re: dogsdad]
#13549994
05/08/20 12:39 PM
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Joined: Mar 2003
Posts: 10,732
Fishin' Nut
TFF Guru
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TFF Guru
Joined: Mar 2003
Posts: 10,732 |
I haven't changed one on a Mercury, but the Yamaha impeller only goes on one way. But what bronco71 said is true, The chances of failure and a very expensive repair are not worth the price of a new impeller. Plus it will probably fail under load which means you are going to be stranded on the water, not in the driveway.
He is truly a sick individual.
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Re: question about impellers
[Re: dogsdad]
#13552175
05/10/20 10:27 AM
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Joined: Jul 2009
Posts: 1,136
Skunked Again Fishing
Extreme Angler
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Extreme Angler
Joined: Jul 2009
Posts: 1,136 |
It would be really hard to reverse the bend and put it back into it's space. But if you could do it, and the rubber is still pliable, sure that would work. But let me tell you a story about a clutch I replaced when I was in college. It took me 6 hrs to unhook the transmission to replace the clutch. 1yr warranty was $50, lifetime warranty was $65. I saved $15, but had to replace it 1yr later. 6 more hrs and I paid $65 for the lifetime. Didn't have to mess with it again.
The moral is: if you took all that labor to get to it, spend the $20, or you'll have to do it again. Unless your time is worth less than $5/hr, spend the $20. Tim
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Re: question about impellers
[Re: Pat Goff]
#13556208
05/13/20 04:44 PM
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Joined: Jun 2008
Posts: 423
Basscat8263
Angler
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Angler
Joined: Jun 2008
Posts: 423 |
The impeller is designed to.seal off the top of the housing. Your key slot won't fit right and itll.just pour.water into.the.exhaust and not up.the water tube.
That's from experience.putting one upside down.. +1
Tony
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