How to properly shim gears in stringer outdrive

[greentahoe]

Is there a way to properly shim the gears and bearings in a stringer 800 upper gearcase without the special tools that the shop manual calls for? If not, where can I get, either buy or rent, the tools called for?

 

[whywhyzed]

Re: How to properly shim gears in stringer outdrive

Buy em on eBay, then resell them after.... that's the common advice I see.

I think it could be all done with rolling torque and machinist's blue instead of dimensions. But I couldn't describe in a posting what all would be involved. Setting up gears in any transmission is just a combination of proper preload on the tapered roler bearings while at the same time, having the mating gears make the proper contact so the torque is transmitted over the widest possible tooth area.

 

[KaGee]

Re: How to properly shim gears in stringer outdrive

Why? Are you replacing any of the bearings or gears?

 

[greentahoe]

Re: How to properly shim gears in stringer outdrive

I need to replace both gears and all the bearings in the upper gearcase.

 

[DHPMARINE]

Re: How to properly shim gears in stringer outdrive

You might investigate dougrussell.com.I think you can get it rebuilt there.No matter what,I doubt it'll be cheap. I only mention this because they are in Ma. and you are in Conn.Like anywhere keep your eyes wide open.I've never dealt with them,so can't really back them.

DHP

 

[greentahoe]

Re: How to properly shim gears in stringer outdrive

There's a complete unit on Ebay rebuilt by them to the tune of $4200. You're right, it's not cheap. However, if I knew that I could get by without the special tools used to gauge the shims, I could do it for considerably less.

 

[KaGee]

Re: How to properly shim gears in stringer outdrive

You might want to look here too: http://www.sterndrive.info/800_lower_repair_cost.html And: http://www.sterndrive.info/id130.html

 

[greentahoe]

Re: How to properly shim gears in stringer outdrive

I think I've looked everywhere, including sterndrive. Bottom line is this: if I can do a good job by checking rolling torque and backlash between gears without the special tools, then that is by far the most inexpensive way to go. The real question is can I do it, and are there specific things I need to know and do for it to work properly.
I've had every nut and bolt off this engine/drive unit, rebuilt the engine, later replaced all the bearings when I developed an oil leak that I didn't know about, etc, etc. I have worked on engines, fixing and rebuilding, for a long time, so getting into the gears is not that huge a deal.

 

[tommays]

Re: How to properly shim gears in stringer outdrive

I repiar gearboxs on mixers and do a littel outdrive work also

All the drive gears are machined to allow to allow the tools to set there position

Without the tools to set the gears at the correct height in the corrrect order even if you get the backlash in the ballpark

The teeth will not be makeing 100% contact ,will it work yes how long its a WAG at best

I just ran into a job last week on and older machine drive it HAD to go back to the factory there are no tools to reshim it :devil:

Tommays

 

[DHPMARINE]

Re: How to properly shim gears in stringer outdrive

Rolling torque and backlash is pretty much what it's all about.I just don't know where you'll get those specs.Actually I think the sub assemblies were just a torque setting,not a rolling spec.

But without specs,you can only ink the teeth and try for good engagement.Just dosen't seem practical or economical.(costly if it blows)

DHP

 

[greentahoe]

Re: How to properly shim gears in stringer outdrive

My shop manual gives the torque in in-pounds and the backlash. Off the top of my head I think the torque is around 6-20 in.lb, and the backlash is .008-.014., measured at the ball gear.

 

[DHPMARINE]

Re: How to properly shim gears in stringer outdrive

Then I'd go for it ! ! You got the figures you need.

DHP