Reply
 
Thread Tools Search this Thread
 
Old 10 June 2010, 15:11   #1
Member
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
Mercury blueband 850, shift shaft came out of lower unit

Hi guys
I'm hoping you can help me. I've spent all afternoon reading and not managed to find anyone with the same problem as me. While changing my waterpump everthing went smootly. However I realised it was stuck in forward. I have now realised that my shift shaft should not have come out of the lower unit and now with the lower unit off I cant get the gears to change. The shift shaft just seems to spin.
When I push the shift shaft as deep as it goes. It spins by hand easily but not changing gear. When I pull it out about a cm, it turns with resistance but it's not coming out of forward.
I've tried spinning the prop while turning the shift shaft without feeling any difference
Does anyone have any ideas? I really dont want to have to strip the gearbox as I dont have the tools for that job.
Thanks in advance for any help
__________________

__________________
crazymac680 is offline   Reply With Quote
Old 10 June 2010, 15:23   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Do you mean the splined shaft came out leaving a hole into the gearbox?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 10 June 2010, 15:37   #3
Member
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
Yeah afraid so Nos.
__________________
crazymac680 is offline   Reply With Quote
Old 10 June 2010, 15:38   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Gearbox strip to fix I'm afraid.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 10 June 2010, 15:47   #5
Member
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
lol I really hope your wrong mate. Just got a pretty awesome step by step guide. I'll paste it here for anyone else who has the same problem

There is constant pressure on the shift cam, via the shift plunger and spring-loaded shift clutch.

When the shift shaft pulled out of the gearcase, the plunger pushed the shift cam out-of-position. So when you stick the shaft back in the hole, it's just hitting the top of the cam (or bottoming out on the structure inside), instead of going back in the splines.

To fix this without disassembling the gearcase, you'll first need to drain out all the gear oil.

Then remove the shift shaft bushing/seal assembly so you can easily see down the hole where the shift shaft goes. The bushing has right-hand threads and just unscrews. You'll need the special tool to fit the slots in the bushing, or grind an old socket to fit.

Spray some carb cleaner down there to wash away any residual gear oil, be sure you keep the drain plug open to let the excess out.

Grab hold of the prop and turn it in the direction that it ratchets - clockwise.

Note that right before the next 'click', you'll feel a bit of resistance, then the 'click'. What's happening is, the beveled edges of the shift clutch are riding on the corresponding edges of Fwd gear. As you turn the prop, spring pressure forces the clutch against Fwd gear.

The click you hear is the shift dog suddenly moving from the top of one edge or 'ramp' on the fwd gear, to the bottom of the next.

As the clutch 'climbs' the ramps, it moves back slightly in the gearcase. This takes pressure off the shift plunger and will allow the shift cam to be 'jostled' back into position.

So, once you've got a feel for how the clicking works, turn the prop and stop just before the next click. When you feel that slight resistance.

Then, peer into the shift shaft hole with a strong lite. You may see the shift cam and the center splined hole looking at you.

If you don't see anything, give the gearcase a 'bump' to and fro, side-to-side, and you should see it come into view.

The goal is to get the splined hole in the shift cam centered so you can reinsert the shift shaft.

Soon as you get that hole lined up, get that shaft back in there!

You'll probably have to do this a few times 'til you get it just right. And the prop might come off the 'ramp'.

No Worries, Mate, just set it up and try again. The shift cam is pretty much captured in its little space. It can't do much more than move around a bit.

Note that you'll see a groove towards the top of the shift shaft; there's supposed to be a clip installed there. When the shaft pulled out, the clip was left behind. If you see the clip, use a magnet to get it out. If you can't see it, it's probably fallen inside the lower unit. In that case I'd definitely use a magnetic drain plug and likely that'll catch the clip.

You can go to an auto parts store and get a "C" clip which will hold much better than the factory spring clip. Just take the shift shaft with you to get the right fit.

Well, that's about it, HTH & G'luck.......ed
__________________
crazymac680 is offline   Reply With Quote
Old 11 June 2010, 03:50   #6
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,611
Just before you go dismantling evetrything (and I should add I'm asking this off the top of my head based on my investigations as to what I could get an old PT unit off for mine) but I think there are great similarities beween the 850 & the 650 / 600, in which case does your shift shaft push / pull or rotate?

If it rotates, those splines are meant to come out. On reassembly you engage Fwd up top and reassemble. The gearbox defaults to forward in the absense of the shift shaft to hold it anywhere else.

If it's a push / pull design, ignore this!
__________________
9D280 is offline   Reply With Quote
Old 13 June 2010, 18:49   #7
Member
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
Quote:
Originally Posted by 9D280 View Post
Just before you go dismantling evetrything (and I should add I'm asking this off the top of my head based on my investigations as to what I could get an old PT unit off for mine) but I think there are great similarities beween the 850 & the 650 / 600, in which case does your shift shaft push / pull or rotate?

If it rotates, those splines are meant to come out. On reassembly you engage Fwd up top and reassemble. The gearbox defaults to forward in the absense of the shift shaft to hold it anywhere else.

If it's a push / pull design, ignore this!
The shift shaft is a rotating type. The shaft should have stayed in the gearbox and it should have split at the coupling. I disasembled in forward and reasembled and now the gears dont change.
Thanks anyway
__________________
crazymac680 is offline   Reply With Quote
Old 14 June 2010, 06:50   #8
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,611
Ah, now it makes sense.
__________________
9D280 is offline   Reply With Quote
Old 15 June 2010, 00:56   #9
Member
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
Managed to make my tool yesterday before I came on night shift. I went round all the local garages and they all recomended that I just make one out of a socket. So I forked out for a grinder, vice and 4 x 23mm sockets. My first attempt came out pretty good after about 10min of grinding. I just need to get an attachment for my impact driver on the way home from work and I'll give it a try. Hopefully all goes sweetly
Dan
__________________
crazymac680 is offline   Reply With Quote
Old 15 June 2010, 10:29   #10
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
It'll be nice if it does. However, isn't there supposed to be a circlip inside the box that holds the shift shaft in? How are you going to refit it if there is?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 18:51.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.