headers
Martin Phillips | 17 Aug 2012 22:37
Picon
Picon

Delta 20 gearbox

My gearbox is leaking oil from behind the selector lever. Not a lot, but 
much more than one would like. Looking at the workshop manual it appears 
that there is a spacer and o-ring on the end of the selector valve, 
which is a rod-like device held in with a nut on the outside of the 
lever. Tucked in somewhere is a spring and ball bearing which might ping 
out, but the drawings I have are very unclear.

Can anyone advise if it is possible to change the o-ring just by undoing 
the retaining nut on the selector lever, or is it necessary to take off 
the pump adaptor / manifold plate as suggested in the manual? That's a 
bit more complicated as some of the bolts are tucked away behind the 
drive shaft coupling.

Martin/

------------------------------------
Permalink | Reply |
headers
Graham | 19 Aug 2012 18:21
Picon

Re: Delta 20 gearbox


Martin

You are correct. There is an O ring oil seal on the shaft behind a spacer that is held in place by the selector
lever. If you undo the nut holding the selector lever on (it may be best to disconnect the cable first) the
ball bearing is sprung against the back of the selector lever and will fall out so place a tray underneath to
catch it before taking the lever off. Also, be careful NOT to rotate the selector shaft through 180 degrees
whilst extracting and fitting the seal, you'll find the gearbox refuses to work. It pays to mark the top
with a marker pen or similar.
I have exactly the same issue on Jannock at present. When I tried to sort it out yesterday I could not remove
the old O ring as I didn't have any very fine nosed pliers with me. I ended up fitting another additional (but
smaller diameter) O ring in and replacing the spacer and lever - grease the end of the spring and the ball
bearing should sit tight whilst you refit the lever - and although it has made the gear change a little
stiffer, it's stopped the flow of oil until I can attack it again when I have the correct pliers with me.

Good luck

Graham
www.jannock.org.uk

------------------------------------
Permalink | Reply |
headers
Martin Phillips | 19 Aug 2012 20:16
Picon
Picon

Re: Re: Delta 20 gearbox

On 19/08/2012 17:21, Graham wrote:
>
> Martin
>
> You are correct. There is an O ring oil seal on the shaft behind a
> spacer that is held in place by the selector lever. If you undo the
> nut holding the selector lever on (it may be best to disconnect the
> cable first) the ball bearing is sprung against the back of the
> selector lever and will fall out so place a tray underneath to catch
> it before taking the lever off. Also, be careful NOT to rotate the
> selector shaft through 180 degrees whilst extracting and fitting the
> seal, you'll find the gearbox refuses to work. It pays to mark the
> top with a marker pen or similar. I have exactly the same issue on
> Jannock at present. When I tried to sort it out yesterday I could not
> remove the old O ring as I didn't have any very fine nosed pliers
> with me. I ended up fitting another additional (but smaller diameter)
> O ring in and replacing the spacer and lever - grease the end of the
> spring and the ball bearing should sit tight whilst you refit the
> lever - and although it has made the gear change a little stiffer,
> it's stopped the flow of oil until I can attack it again when I have
> the correct pliers with me.
>
Thanks Graham. Useful tips, and I'll take some very fine forceps and 
various bent pointy things for weeching out the o-ring. I didn't have 
time to start dismantling when I noticed the problem on Friday (and 
thought it advisable to look at a diagram first!) , so I'll be back with 
the tool kit and an o-ring (if it arrives in time) on Tuesday. I also 
ordered a spare ball and spring in expectation of their ending up in the 
inaccessible bit of the engine bilge!
(Continue reading)

Permalink | Reply |
headers
Graham Hill | 20 Aug 2012 13:38
Picon

Re: Delta 20 gearbox

I had this problem with my delta 20.  Turn the engine over with the stop
button engaged so the engine will not run, gear box engaged in forward or
reverse and the pressure will push the seal out.  It worked for me.

Graham

[Non-text portions of this message have been removed]

------------------------------------
Permalink | Reply |
headers
Graham | 20 Aug 2012 21:25

Re: Delta 20 gearbox

Graham wrote "  Turn the engine over with the stop button engaged so the engine will not run, gear box engaged
in forward or reverse and the pressure will push the seal out. "

An excellent tip Sir that'll be tried next weekend.

Graham
www.jannock.org.uk

------------------------------------
Permalink | Reply |
headers
Martin Phillips | 22 Aug 2012 17:54
Picon
Picon

Re: Re: Delta 20 gearbox

On 20/08/2012 12:38, Graham Hill wrote:
> I had this problem with my delta 20.  Turn the engine over with the stop
> button engaged so the engine will not run, gear box engaged in forward or
> reverse and the pressure will push the seal out.  It worked for me.
>

An excellent tip! I got the operating lever off without losing the ball 
and spring, got the spacer bush out with the help of a circular 
neodymium magnet which happened to be exactly the right size and in the 
engine room, but failed to extract the seal with the tools at hand (not 
helped by being unable to see into the end of the gear selector valve's 
hole). A couple of turns of the engine and the o-ring popped up just 
proud enough to be extracted with the aid of a small penknife.

The new seal is now in place, the oil level topped up to the right 
level, and there seem to be no leaks. I'll give it a good run over the 
next few days to make sure all is well.

To answer one of my original questions, it is not necessary to take the 
pump cover off to change the selector seal :-)

Thanks!

Martin/

nb Boden, Stroudwater Canal.

------------------------------------
(Continue reading)

Permalink | Reply |
headers
Graham | 28 Aug 2012 13:26

Re: Delta 20 gearbox

Martin wrote " An excellent tip! "

I completely agree, took me less than 5 minutes to remove the temporary second seal and the hardened
original and fit the new one. Sorted! Now looking forward to a two week cruise starting next Saturday -
hopefully the Leicester ring as long as the soar doesn't play silly bu££ers - culminating at the Cutweb rally.

Graham
www.jannock.org.uk

------------------------------------
Permalink | Reply |

Gmane