Problems with removing the gearbox (Mercury 650)

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JohnVis

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Mar 8, 2011
Messages
9
Can any one help me.

I got an merc650 and i need to remove the gears from the gearbox.
Do i just need to pull it out, do i need to remove the driveshaft first??

PLEASE help me.... i want the boat back in the water!!!

Can any one help me with how to and what first??
I already got the lower unit of.

regards John
 
C

Chris1956

Supreme Mariner
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Mar 25, 2004
Messages
28,902
Re: Problems with removing the gearbox (Mercury 650)

John, I am not sure what you are asking, nor what year motor you are asking about. If you need to remove the gearcase on a 70s or 80s inline motor, there should be 5 nuts and a hidden bolt holding it onto the midsection.
 
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carholme

Rear Admiral
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Sep 4, 2010
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4,845
Re: Problems with removing the gearbox (Mercury 650)

John;

Give us the s/n of the engine and we can get the parts listing for you.

Gerry
 
J

JohnVis

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Mar 8, 2011
Messages
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Re: Problems with removing the gearbox (Mercury 650)

Thanks for your anwsers.

I think my engine is from the 70s.

The previeus owner of the engine removed the gears from the gearcase.. but i think he jus pulled it out by the gearshaft. Some of the gears are no lose in the case.
How can i put it together? do i need to remove the driveshaft first or can i put i together in the gearscase?

regards John
 
C

Chris1956

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Messages
28,902
Re: Problems with removing the gearbox (Mercury 650)

You can install the gears w/o removing the driveshaft. However, if the gearcase was disassembled, it implies there is something wrong with the components. In addition, certain gear clearances need to be maintained by shimming the gears. I would get a service manual and inspect the gears, bushings and bearings for tolerances and specifications. Complete used gearcases are pretty available as well.
 
J

JohnVis

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Mar 8, 2011
Messages
9
Re: Problems with removing the gearbox (Mercury 650)

Is the lower unti of an 402 the same as the one on the 650?? as far as i can see it, it's the same... or are the gears differnt??
 
C

carholme

Rear Admiral
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4,845
Re: Problems with removing the gearbox (Mercury 650)

John;

You said you think your engine is from the '70s. Better know for sure if you plan on swapping any component. You will need to know the s/n of your engine as well as the s/n of the replacement engine and p/n of the replacement LU. The same LU for a given hp and year in many cases is only applicable to certain s/ns for that year.

Here is an example of a page showing what I mean.

http://www.crowleymarine.com/mercury-outboard/parts/460_19.cfm

Gerry
 
J

JohnVis

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Joined
Mar 8, 2011
Messages
9
Re: Problems with removing the gearbox (Mercury 650)

I think i can find out my numbers.. but not from the 40hp engine.... are the gears changed during those years?? the tail has extact the samen size and fittings.
 
J

JohnVis

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Mar 8, 2011
Messages
9
Re: Problems with removing the gearbox (Mercury 650)

Does any one know where i can order some parts of this OLD engine?
 
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