Merc/Mariner 15 two stroke neutral in/out gear adjustment?

[Max...]

Well....referencing page 216 it says measurement (ambiguous drawing as ever) should ("MUST") be 419mm with box presuming in N as per page before.

My measurement in N is 419 as it should be. But I reckon it needs to be around 424 to line up with tiller in middle of N...

???

[Fenlander]

I would have gone for Neutral when taking that measurement... you are taking it from the top of the impellor housing??

Was there any reason earlier upthread you thought the shaft length might be out from doing the impellor a while back... or was that just a "probably" once this current problem started troubling you?

I assume if you operate the gearbox with the shaft the "detents" in FNR feel quite positive?

[Max...]

Yes, as per drawing - base to top.

When I did impeller I never changed it. I think it has always been a bit wooly like this.

Yep, moving lever by hand all is clonky (positive) and good.

[Max...]

Pic attached

[Fenlander]

Oh well my logic says if the shaft length can be positively proved like this but doesn’t allow the link to readily align in neutral the cables from twistgrip to gear change pulley need revisiting all the way along. Perhaps now return to the idea of setting the cable adjusters so the nylon pulley rotates to allow the clip pin to align??

[Max...]

Or unscrew shaft 6 turns to give me 5mm more and refit to try? All the fiddling with the jam nuts yesterday got me know where!

[Fenlander]

Yes that may work as long as there is sufficient thread left at the gbox end??

[Max...]

All done and working fine. Yes, checked thread and from all the way in there is 20 odd turns or 17mm thread. At 419 as set before then 16mm or so and I've re done it at 423 in the end so 5 turns more out leaving 12mm threaded on a 6mm shaft which I'm happy with.

[Fenlander]

Result... albeit odd how it has become like this.

[Max...]

IIRC it's probably been like that all the time I've had it. It's less than 1% out so works for me.