Reply
 
Thread Tools Search this Thread
 
Old 30 March 2006, 13:04   #21
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
Right, this was beginning to niggle at me, so I went and had a good look at my seloc manual which covers from 1965 to 1985 and there's definitely never been a bolt inside it- I suspect that your driveshaft is siezed to the crank and the 10mm movement is due to bearing or spline movement in the lower unit.
__________________
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 30 March 2006, 14:12   #22
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by Nos4r2
...and the 10mm movement is due to bearing or spline movement in the lower unit.
Nah. Not unless it's fallen to bits inside the lower unit.

I don't know your engine but, presuming there's nothing unusual about it and you have definately removed all the bolts which should be removed, you would expect there to be 3 connections to separate;
1) the gear select shaft,
2) the driveshaft and
3) the water connection to the pump.

If Nos is correct then 1 is taken care of unless the splines are stuck and the shaft is pulling down against the inside of the engine casing or whatever mechanism is inside the casing.

If you have 10mm of movement the driveshaft spline is free but some motors have a seal in the bottom of the crankshaft spline. Could the driveshaft spline be hooked up on this? Alternatively, could the bottom of the crankshaft be a lump of rust which the spline is coming up against?

At the water connection I'd expect a pipe to simply slide out of a rubber neck seal. Squint in with a torch and see what you can see.

Just some thoughts.

Edit; there could be a speedo pickup pipe in there too. Possibly flexible.
__________________

__________________
JW.
jwalker is offline   Reply With Quote
Old 30 March 2006, 15:52   #23
Member
 
Country: UK - England
Town: herts
Make: avon searider/bom380
Length: 4m +
Engine: merc 50 2 stroke
Join Date: Jul 2005
Posts: 260
thanx again for the posts , certain all bolts are removed and selector is not the problem the problem to my mind is around the drive shaft not coming through as i said before can feel in knocking through fly wheel and the movement of the shaft seems to be top end rather than bottem sump end although this all by feel so could be wrong as metal has a habit of transmitting through it!
so if theres no fixings holding it and its rusted and just pulling down on engine casing what is the best way to proceed to free it ,said before gave it a go with wedges and got know extra movement at all if anyone has workshop sectional picture showing the assemly of this shaft woould be useful
would like to do my own sectional view with an angle grinder to see wat the problem is !!!
__________________
Dino89 is offline   Reply With Quote
Old 30 March 2006, 17:20   #24
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by Dino89
....would like to do my own sectional view with an angle grinder to see wat the problem is !!!
__________________
JW.
jwalker is offline   Reply With Quote
Old 31 March 2006, 01:12   #25
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
Quote:
Originally Posted by Dino89
if anyone has workshop sectional picture showing the assemly of this shaft woould be useful
I do, but I'll have to get a pic to you later when the camera batteries are charged up.

There's no speedo pickup on pre blueband model 500's.

The main driveshaft on these usually has a fair bit of movement up/down on the splines into the drive gear of the lower unit-about 10mm in fact. This is why I suspect that your driveshaft is siezed to the powerhead. The driveshafts on the red bands weren't stainless-they just had a plated area round the lower unit seal unlike the later bluebands.

This is going to sound odd, but what I'd do is turn the engine upside down on a flat surface (make sure there's no water in it 1st),block up ALL the holes that aren't in the lower unit(carbs, plugs, peehole, exhaust transfer port) and pour a gallon of diesel straight through the 10mm gap in the lower unit. Leave it for a week or two for the diesel to penetrate, maybe tapping the chocks occasionally while you wait to see if it pops apart.

This sounds loads more sensible when you bear in mind the manual seems to think the only way of seperating a siezed drive/crank joint is to drill a hole in the leg and then cut it with a gas-axe... There's realistically no easy way of dealing with a 40 year old engine that's got stuff siezed in it

Assuming it comes apart, make sure all the diesel has drained out of the engine before you try and turn it over or it'll fluid lock.
__________________
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 31 March 2006, 10:30   #26
Member
 
Country: UK - England
Town: herts
Make: avon searider/bom380
Length: 4m +
Engine: merc 50 2 stroke
Join Date: Jul 2005
Posts: 260
thanx again ,going to give the diesal a go at weekend it does sound better than the other option !!
will feed back with results!!
Dino
__________________
Dino89 is offline   Reply With Quote
Old 01 April 2006, 11:50   #27
Member
 
Country: UK - England
Town: herts
Make: avon searider/bom380
Length: 4m +
Engine: merc 50 2 stroke
Join Date: Jul 2005
Posts: 260
right engine is off and upside down filled with diesal in garage will wait and see if we get any more movement next weekend,
Nos if u get a chance would like to have a look at a picture of this shaft assembly
thanx for all the help
Dino
__________________
Dino89 is offline   Reply With Quote
Old 01 April 2006, 14:32   #28
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Dino, I hope it comes apart but if it doesn't, presuming the impeller doesn't have a metal centre, I'd have a go at putting a cut right through the replacement impeller just infront of the keyway. You could put a drop of superglue on the cut area to bring it back together once fitted around the shaft. Rubber superglues particularly well. If the cut is in such a position that the impeller is trailing the keyway when it is rotating and since the rubber is always pushed inwards inside the pump housing, you'd have fair chance of it staying together.

Just another wee thought.
__________________
JW.
jwalker is offline   Reply With Quote
Old 03 April 2006, 18:53   #29
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
I WILL get you that pic....I 'm cursing,I can't find the camera since my girlfriend packed it to take to her parent's.
__________________
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 04 April 2006, 15:11   #30
Member
 
Country: UK - England
Town: herts
Make: avon searider/bom380
Length: 4m +
Engine: merc 50 2 stroke
Join Date: Jul 2005
Posts: 260
will check back for picys thanx,
we have got the motor upside down still filled with diesal and all fingers & limbs crossed !! brotherinlaw is going to look tonight or tomorrow c if anything gives !!
__________________

__________________
Dino89 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 18:02.


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