gearbox rebuild help

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pinkbits

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Jun 19, 2013
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Serial 9446061 9.8 gearbox has water in it , ive removed impeller and seal carrier and have pulled on impeller shaft , bearing has moved a tiny bit but has stopped , what next ? And how do i get selector and drive shaft out of the top ? Any help would be great, reg
 
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carholme

Rear Admiral
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Sep 4, 2010
Messages
4,845
Re: gearbox rebuild help

Your s/n comes up as:

9,8 9.8 2-cyl 9445986 9467611 1986 Belgium

From here:

Mercury 2-takt, 2-cyl, 9,8-15 hp, produktions?r, modellguide

Parts listing:

7.5 /9.8 H.P. - Mercury, Mercruiser, Force, etc. Parts Lookup

Service Manual p/n 90-86136--1

The first thing to do is replace item 37/39 under GEAR HOUSING (PROPELLER SHAFT) as these are notorious for allowing water entry. However, it seems that you are already into the gearbox. By seal carrier, do you mean item 62 under GEAR HOUSING (PROPELLER SHAFT)?

To remove the driveshaft, you have to first remove item 10/11 and 12 under GEAR HOUSING (DRIVE SHAFT), then you can lift the driveshaft out.

Gerry
 
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pinkbits

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Re: gearbox rebuild help

thanks ,
ive got water pump im[peller housing off and seal and circlip and a few shims , ive tried pulling out drive shaft with a slide hammer with no success , any suggestions
 
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carholme

Rear Admiral
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4,845
Re: gearbox rebuild help

As said in my previous post:

To remove the driveshaft, you have to first remove item 10/11 and 12 under GEAR HOUSING (DRIVE SHAFT), then you can lift the driveshaft out.

Have you done this yet?

Gerry
 
Yesterday

Yesterday

Petty Officer 1st Class
Joined
Feb 21, 2012
Messages
354
Re: gearbox rebuild help

In other words, there's a pinion gear held onto to the bottom of that shaft with a nut that's holding it in. Not sure why you'd need to remove the drive shaft though, as (if I'm not mistaken) the seals are accessible from the water pump area.
 
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pinkbits

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Re: gearbox rebuild help

Yesterday said:
In other words, there's a pinion gear held onto to the bottom of that shaft with a nut that's holding it in. Not sure why you'd need to remove the drive shaft though, as (if I'm not mistaken) the seals are accessible from the water pump area.
Click to expand...

i missread sorry
, im pulling the whole thing apart as its had water in it since i used it last and i want it clean , ill change bearings also etc
ive taken out seal carrier on prop shaft and under that is a big bearing i can see , how do i get that out so i can get at pinion gear etc on bottom of driveshaft , cheers
 
Yesterday

Yesterday

Petty Officer 1st Class
Joined
Feb 21, 2012
Messages
354
Re: gearbox rebuild help

pinkbits said:
i missread sorry
, im pulling the whole thing apart as its had water in it since i used it last and i want it clean , ill change bearings also etc
ive taken out seal carrier on prop shaft and under that is a big bearing i can see , how do i get that out so i can get at pinion gear etc on bottom of driveshaft , cheers
Click to expand...

I'm not certain about yours, but with the larger motors, they all literally slide right out once the prop shaft is removed, save for the one behind the pinion gear (FWD I want to say?) which just takes a little maneuvering. My prop shaft came out with everything intact except that gear and the shift dog. Simple in design but effective. Somehow I think ultimately yours would just be a smaller version of the same, but maybe someone who has worked on these will chime in.

Take care to note where any shims may originate from!!
 
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