915 reverse gear install direction

[thetorch]

915 reverse gear install direction: markings out or markings towards the gearbox?

On disassembly my markings were facing inwards, but my Bentley says markings should face outwards.

Maybe it doesn't matter since it's reverse, or maybe the prior builder knew something I don't.

[gled49]

If your concerned, install the reverse idler gears and look at the offset as witnessed by wear on small gear, and install that way.

[kevingross]

Numbers face outward. Perhaps less critical for reverse since it doesn't get used to much and noisiness is less of a concern.

[thetorch]

Thanks. Makes sense.

[icarp]

numbers out and the wear pattern on the pic shows the gear is in backwards

[thetorch]

Ian,
curious if the wear pattern on the gear teeth or on the outside face is the tell. Trying to learn as I go...
thx

[icarp]

The tooth at 10 oclock has a wear bar at the inner edge of the tooth , a dark line
If you flip the gear the dark line will be on the nut side .
Then put the other shaft in and all the bearings ans sleeve and you can see the tooth match up where the dark edge is just off the other gear .
Hope this helps

[kevingross]

Originally Posted by icarp

The tooth at 10 oclock has a wear bar at the inner edge of the tooth , a dark line
If you flip the gear the dark line will be on the nut side .
Then put the other shaft in and all the bearings ans sleeve and you can see the tooth match up where the dark edge is just off the other gear .
Hope this helps

That's not wear. It's an area of the tooth that does not make contact with its mate, has not been lapped and sees no practical wear. The same is true for the opposing area ("nut side"). Cheers,

[Hotshot]

When I undid my first 915 box I worked on..

[icarp]

Originally Posted by kevingross

That's not wear. It's an area of the tooth that does not make contact with its mate, has not been lapped and sees no practical wear. The same is true for the opposing area ("nut side"). Cheers,

That is exactly what I am saying , lapped or any contact pattern
The visual que is what I am pointing out .



Same stuff different words

Ian

[thetorch]

Originally Posted by Hotshot

When I undid my first 915 box I worked on..

I'll bite: The broken idler gear teeth? Feel like I am failing some eye test...

[Hotshot]

Originally Posted by thetorch

I'll bite: The broken idler gear teeth? Feel like I am failing some eye test...

Good eye. Ya apart from all the syncros being shot, dog teeth shot, case bores spinning, the idler has a tooth chipped. Lol. That was staying put.