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Old 11 June 2015, 14:49   #1
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Gear box issue

I have a 2002 Mercury 135 outboard and it looks like the gear box is knackered. Does anyone know if these can be repaired or where I could get a decent reconditioned or second hand one please? Forward gear is ok but it won't select reverse and is slipping. Many thanks
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Old 11 June 2015, 15:18   #2
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I have a 2002 Mercury 135 outboard and it looks like the gear box is knackered. Does anyone know if these can be repaired or where I could get a decent reconditioned or second hand one please? Forward gear is ok but it won't select reverse and is slipping. Many thanks
That could be a selection issue. If so, it'll be down to cable adjustment or seizure. If it's more serious, it's still fixable by the right man.
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Old 11 June 2015, 15:28   #3
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Thanks. I think it's more than a cable issue as I tried that but when it is on gear and pressure applied to the prop, it's slipping. Either a new gearbox or new cogs I think but not sure where I'd get that from
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Old 11 June 2015, 15:35   #4
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Usually one or two available on eBay, lots in the States. It's probably repairable by someone with the right tools and knowledge.
I'd ring around to get a quote for repair, secondhand ones tend to go for around 350-400 but you'd need to be confident it's ok. Avoid the Soham con man under his various trade names!
Parts are cheap in the States , just watch for import duty in your sums.
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Old 11 June 2015, 15:36   #5
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Usually one or two available on eBay, lots in the States. It's probably repairable by someone with the right tools and knowledge.
I'd ring around to get a quote for repair, secondhand ones tend to go for around 350-400 but you'd need to be confident it's ok. Avoid the Soham con man under his various trade names!
Parts are cheap in the States , just watch for import duty in your sums.
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Old 11 June 2015, 16:04   #6
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Thanks
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Old 12 June 2015, 05:32   #7
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when you say pressure applied to prop do you mean in water or turning by hand?
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Old 12 June 2015, 05:40   #8
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when you say pressure applied to prop do you mean in water or turning by hand?
I mean basically applying pressure with the boot. It's quite stuff then slips. Also doesn't sound good in reverse gear
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Old 12 June 2015, 05:48   #9
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if out of water they will lock in one direction and slip (knock in the other)

on my alpha one you have to hold it in the opposite direction to what seems logical

from memory i think it was clockwise for reverse and anti for forwards
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Old 12 June 2015, 07:35   #10
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Not wanting to state the obvious, but this box hasn't been off to do a water pump and the splines on the shift shaft not lined up properly when it was refitted ? The prop on a Merc box will "idle" in one direction in gear when it's rotated by hand and it'll rattle when you do that. The back of the gear dog is "ramped" to allow this.
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