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Old 07-06-2007, 05:22 PM   #1
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Unhappy help gear box problems

on saturday i was hacking hit big wave aired the boat and then had no drive the engine just screamed had now has no forward it just dangs and slips managed to get home on ticker but bands and engine jumps and slips please help its a 115hp straight 6 1988 got the leg off removed prop and retaing ring behind but cant get it apart help any one or how has a manule thanks
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Old 07-06-2007, 05:39 PM   #2
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should just be a case of removing the impellor hsg remove the drive shaft, once the drive shaft and pinion gear are removed from the top of the gearbox this should then allow the main shaft with the reverse and forward gears and clutch assy on to slide out the gearbox housing,
i think
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Old 07-06-2007, 05:45 PM   #3
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Sounds like your prop bush has gone. or both bush and gearbox
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Old 07-06-2007, 05:53 PM   #4
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should just be a case of removing the impellor hsg remove the drive shaft, once the drive shaft and pinion gear are removed from the top of the gearbox this should then allow the main shaft with the reverse and forward gears and clutch assy on to slide out the gearbox housing,
i think
i have removed the water pump and impeller but cant see how to remove the bottom part of the water pump
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Old 07-06-2007, 05:59 PM   #5
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Sounds like your prop bush has gone. or both bush and gearbox
the prop can be rotated in reverse when in forward gear it makes a clicking noise andm is free turning as if not in gear but if you rearly pull on the prop it pops pasted rotates in the right direction stange
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Old 07-06-2007, 07:41 PM   #6
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as wacky racer says iit could be the rubber bush in the prop, is the shaft the prop is on turning as well as the prop when you have it in gear and force is applied?
if not its the bush, if it is turning the problem is in the guts of the box.
the engine moving about could be if the bush stops slipping if it is that! then the prop takes a grip.
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Old 07-06-2007, 09:21 PM   #7
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From the sounds you've described is gear not bush,
don't try takin box apart, no offence but is specialist job gettin measurements of play etc,
seek engineer to do it for you,
may cost more but don't wanna do it yourself then a tiny bit of play ruin it the first time you go out.
Max
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Old 07-06-2007, 10:39 PM   #8
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my old man is a yamaha tec but has never worked on a merc before so it seams the same but the bearing holder is stuck solid with corrotion we have tryed a slide hamer and suff but cant move it has any one had this problem i know the have at his work and the just bin the skeg and box
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Old 07-06-2007, 11:29 PM   #9
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Try heat to the outercasing.
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Old 08-06-2007, 01:16 AM   #10
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Put the prop on(preferably an old one), but not all the way. Put a couple of pieces of packing either side into the gap between prop hub a gearbox outer face, and then wind the prop nut. On your lower you probably don't need to remove gear selector shaft, but to be safe take it out anyway beforehand. Once it breaks free you can continue with the slide hammer
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Old 09-06-2007, 01:00 AM   #11
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Put the prop on(preferably an old one), but not all the way. Put a couple of pieces of packing either side into the gap between prop hub a gearbox outer face, and then wind the prop nut. On your lower you probably don't need to remove gear selector shaft, but to be safe take it out anyway beforehand. Once it breaks free you can continue with the slide hammer
chears worked perfect it is the dog clutch and the forward gear that has gone thats the problem any one know wear i could get one or how much would roughly cost chears
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Old 09-06-2007, 10:34 AM   #12
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Try Sierra Marine Parts
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Old 09-06-2007, 06:43 PM   #13
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Try Sierra Marine Parts
dose any one have a way of contacting them i looked on the barbus sight the forward gear is 300pound and dog clutch is 157pound plus 93 pound postage ant rearly spending that much 1988 115hp what you recon
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Old 09-06-2007, 07:59 PM   #14
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is a lot to spend,you could try a breakers Bill Higham etc for a 2nd hand box.
I will speak to my mate Dave Anderson Marine Monday see what he suggests.
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Old 09-06-2007, 08:13 PM   #15
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is a lot to spend,you could try a breakers Bill Higham etc for a 2nd hand box.
I will speak to my mate Dave Anderson Marine Monday see what he suggests.
thanks cause at this rate getting depressed cause rebuild traier refitted boat new floor had safty froring fitted and wealded so boat is fully water tight and this has hapened
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Old 09-06-2007, 08:27 PM   #16
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dose any one have a way of contacting them i looked on the barbus sight the forward gear is 300pound and dog clutch is 157pound plus 93 pound postage ant rearly spending that much 1988 115hp what you recon

Keypart are an agent for Sierra

They're in Watford. 01923 221490 ask for Paul Ahearn

or, http://www.keypart.co.uk/

EDIT> just looked at their site, and it seems they've moved to Kings Langley now.
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