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08-05-2011, 17:32
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#1
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Registered User
Join Date: Nov 2008
Location: Bayfield, Lake Superior, WI & Wayzata, MN
Boat: C&C 34 & Sonar One Design
Posts: 369
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Impeller Plate Gasket
First time for me. Putting a new impeller in my Yanmar 3GM. I took off the impeller cover plate, put the new impeller in and find I do not have a new gasket. The old gasket is intact. Can I use it? Should I use a gasket sealer of some type (Permatex?) I'll have to order a new gasket and the boat is scheduled to go in tomorrow. This is a raw water cooled fresh-water boat. Thanks for the help.
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Whatever you do, always give 100%. Unless you’re donating blood.
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08-05-2011, 18:00
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#2
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Registered User
Join Date: Jul 2010
Location: Geismar, LA near Baton Rouge
Boat: Vamos, a Ranger 28 Tall Rig
Posts: 151
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Re: impeller plate gasket
Soak the gasket in MMO for a few hours. (Miracle Mystery Oil) It helps it to swell up a bit and will usually seal. Especially if the gasket is intact. But the other thing is, isn't your through hulls equipped with valves? You can always shut them for the launch and just don't open them until you get the impeller fixed.
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08-05-2011, 18:05
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#3
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Moderator Emeritus
Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
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Re: impeller plate gasket
Chart paper has been known to work for a gasket. No gasket won't work so don't try it. If the old one is not broken it might work. If broken it won't work but might limp to a very close destination.
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Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
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13-05-2011, 10:41
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#4
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
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Re: Impeller Plate Gasket
the old one should work if not broken. They are a specific thickness, if you put a home made one in that is thicker it may be worse than reusing the one you've got.
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13-05-2011, 11:36
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#5
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Eternal Member
Join Date: Mar 2008
Location: Tarpon Springs FL
Boat: Cabo Rico 38
Posts: 1,987
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Re: Impeller Plate Gasket
I've even heard of using the cover page of a glossy magazine as gasket material in a pinch. For those old timers that remember when a car/truck had a distributor, points and condenser, I recall using a match book cover to set the gap on the points.
Rich
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13-05-2011, 12:09
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#6
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Registered User
Join Date: Apr 2008
Location: U.S., Northeast
Boat: Currently boatless
Posts: 1,643
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Re: Impeller Plate Gasket
Quote:
Originally Posted by Cheechako
the old one should work if not broken.
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I can attest to that based on personal experience. A bit of silicone grease on the gasket makes it even better. Also smearing some silicone grease over the impeller and inside of the pump housing helps it prime and reduces wear when you start the engine the first time.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
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13-05-2011, 13:41
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#7
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Registered User
Join Date: May 2008
Location: Nova Scotia until Spring 2021
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,976
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Re: Impeller Plate Gasket
I heard a joke concerning a waxed cereal box gasket today, except that apparently it works.
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13-05-2011, 14:25
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#8
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Registered User
Join Date: Dec 2007
Boat: Mahe 36, Helia 44 Evo, MY 37
Posts: 5,731
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Re: Impeller Plate Gasket
sailstoo,
The old intacted gasket will work. You’re lucky, they usually rip.
In the future you may want to think about a speedseal that has the reusable gasket built in.
SpeedSeal replaces the Impeller cover and makes impeller changes faster and e asier.
Welcome to Speedseal How it Works
Mark
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13-05-2011, 14:32
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#9
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Registered User
Join Date: Dec 2008
Location: ontario canada
Boat: grampian 26
Posts: 1,743
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Re: Impeller Plate Gasket
The thickness of the gasket is critical to the efficiency of the pump.
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