Topic: 48 Hiawatha 1.5hp – Antique Outboard Motor Club,Inc

This topic has 20 replies, 5 voices, and was last updated 9 years, 4 months ago by bunnyfoofoo.

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August 30, 2016 at 7:39 pm #5113
bunnyfoofoo
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Head runs great, has water pump problems. The rubber pump looks good and not worn that much, I need to replace seals for prop shaft and gasket and drive shaft pipe. not much info out there on these as these models are also use by gale and others. Some tips would help.
August 30, 2016 at 8:54 pm #42967
frankr
Participant
Lots of info here.

The impeller (properly called a "rotor") swells up from grease leaking out of gearcase. It should be a close fit on the eccentric and just touch the housing at some point on the outside. The other side should have a space "about" 1/8". As the shaft rotates that space progresses aroung then disappears at the outlet side. Then picks up another gulp of water as it reappears at the inlet side.
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August 30, 2016 at 9:05 pm #42968
frankr
Participant
Those motors have an inherent problem with grease leakage into the pump. The grease seal is pressed into the brass bushing. It is an Oilite bushing, meaning it is porous–like a sponge. So the grease liquifies and goes through the porosity, right past the seal. I modify all mine by cutting the bushing back 1/4" and installing a seal right into the housing instead of into the bushing. There is an OMC seal that fits.

The seal on the vertical drive shaft is difficult to remove. There is a screw-in bushing that holds it together and most of them won’t come out without a fight. I just leave it alone and change the grease as it leaks.
August 30, 2016 at 9:33 pm #42971
49hiawatha
Participant
Frank can you share that OMC seal part number? Thank you.
August 30, 2016 at 9:49 pm #42972
frankr
Participant
I knew if I said that, I’d have to look it up. No problem, it is 324639
August 31, 2016 at 2:27 am #42996
bunnyfoofoo
Participant
yes that seal in the shaft i need to replace to. I am ordering 2 new rotor parts. The grease is heavy duty grease? That is what i will use.
The old rotor rubber is not a snug fit to the brass eccentric it is about 1/16 off but still moves the rotor, i guess not enough tho.
So if i take the bushing out like you did and put that seal in it would prolong the life of the water pump but the grease will still leak out the drive shaft after i fix the bottom end. All in theory
August 31, 2016 at 8:58 am #43010
frankr
Participant
If it is 1/16 off the eccentric, it probably does not have any (enough) space on the outside. That space is what moves the water.

Use Lubriplate 105 "Motor Assembly Grease" available from NAPA Auto Parts stores, or "Corn Head Grease" from John Deere tractor dealers.
August 31, 2016 at 5:15 pm #43054
bunnyfoofoo
Participant
11/16" ID, and 1 3/16" OD, 3/8 thick is the rotors dimensions, and what do they run in cost $12
August 31, 2016 at 8:57 pm #43065
bunnyfoofoo
Participant
ordered the seal, going to make new gaskets, and i might make new rotor.
September 4, 2016 at 4:39 am #43259
bunnyfoofoo
Participant
after closer inspection the eccentric is more worn than i first seen, is there a source or a sub that could be used or am i out of luck. It still can be used but would like to find another.
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