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Old 23 November 2008, 15:11   #1
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Gearbox screw seals

Would I be entirely wrong in thinking that the seal on drain/vent screws on a gearbox could be replaced with any 'bog standard' o-ring? Rather than trying to track down the exactly specific Mercury part number?

Thanks!
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Old 23 November 2008, 15:16   #2
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No, the correct seal is a fibre type washer. Probably got them on the shelf, I can have a look in the morning if you'd like, then pop a couple in the post to you.
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Old 23 November 2008, 18:28   #3
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No, the correct seal is a fibre type washer. Probably got them on the shelf, I can have a look in the morning if you'd like, then pop a couple in the post to you.
Fibre washers on mine, but just serviced the water pump using Mercury's service kit. I gulped at the price but then found it's actually a complete new water pump, including the shaft seals and the little washers for the gearbox plugs. These are a yellow and blue plastic material. I hope they're ok.

By the way Gareth, thanks for help with the shaft bush thingy. All sorted and refitted.
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Old 23 November 2008, 18:53   #4
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No, the correct seal is a fibre type washer. Probably got them on the shelf, I can have a look in the morning if you'd like, then pop a couple in the post to you.
PM sent.
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Old 24 November 2008, 05:28   #5
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Posted this morning!
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Old 24 November 2008, 11:36   #6
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Would I be entirely wrong in thinking that the seal on drain/vent screws on a gearbox could be replaced with any 'bog standard' o-ring?
Standard Buna O-Rings don't play nice with petroleum products. The oils peneetrate and alter the material, usually causing it to go soft and mushy and lose elasticity.

jky
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