Page 1 of 2
Propellor shaft spline
Posted: Fri May 06, 2005 7:02 pm
by Kenneth Jones
Recently, I replaced the universal joints in my propellor shaft. At the same time I had the propellor shaft checked for balance. This did not eliminate an annoying vibration at about 3,700 RPM in top gear. The wheels had previously been straightened & tyres balanced & new wheel bearings fitted, front & rear with new front hubs, so I was fairly sure that wheels weren't causing the problem. The man who checked the propellor shaft balance, an oldtimer like me, came up with the comment that the vibration could be caused by a worn spline. He said that in his experience with MGs, if the spline is not noticeably worn, cleaning & then pumping in grease until it oozes out, will normally solve the problem (in 90% of cases). I thought "Oh Yeah", but tried it. It seems to have worked! Mind you, 4000 RPM in top gear was as fast as I was game to go around the area where I live, so I'll have to wait until I get on a motorway before I am sure.
Has anyone experience with worn propellor shaft splines?
Ken.
[Non-text portions of this message have been removed]
Re: Propellor shaft spline
Posted: Sat May 07, 2005 1:18 am
by fnitz
I had a prop shaft that was worn so I replaced it with a good used one from
Abingdon spares. But prop shafts turn with the rear wheels, not the engine
so rotation is relative to speed, not RPM's. Mine had noticeable play at the
spline at the transmission tailshaft, probably about .010".
Fred TC1353
-----Original Message-----
From:
mg-tabc@yahoogroups.com [mailto:
mg-tabc@yahoogroups.com] On Behalf Of
Kenneth Jones
Sent: Friday, May 06, 2005 7:03 PM
To: mg-tabc
Subject: [mg-tabc] Propellor shaft spline
Recently, I replaced the universal joints in my propellor shaft. At the same
time I had the propellor shaft checked for balance. This did not eliminate
an annoying vibration at about 3,700 RPM in top gear. The wheels had
previously been straightened & tyres balanced & new wheel bearings fitted,
front & rear with new front hubs, so I was fairly sure that wheels weren't
causing the problem. The man who checked the propellor shaft balance, an
oldtimer like me, came up with the comment that the vibration could be
caused by a worn spline. He said that in his experience with MGs, if the
spline is not noticeably worn, cleaning & then pumping in grease until it
oozes out, will normally solve the problem (in 90% of cases). I thought "Oh
Yeah", but tried it. It seems to have worked! Mind you, 4000 RPM in top gear
was as fast as I was game to go around the area where I live, so I'll have
to wait until I get on a motorway before I am sure.
Has anyone experience with worn propellor shaft splines?
Ken.
[Non-text portions of this message have been removed]
Yahoo! Groups Links
Re: Propellor shaft spline
Posted: Sun May 08, 2005 12:39 pm
by David Lodge
Hello Ken,
Everything OK with the clutch? Just a thought.
Regards, David Lodge
----- ORIGINAL MESSAGE -----
From: "fnitz" fnitz@pacbell.net>
To: "'Kenneth Jones'" jonesks@optusnet.com.au>,"'mg-tabc'"
mg-tabc@yahoogroups.com> Subject: RE: [mg-tabc] Propellor shaft
spline
Date: 7.5.2005 - 10:18:55
> I had a prop shaft that was worn so I replaced it with
> a good used one from
> Abingdon spares. But prop shafts turn with the rear
> wheels, not the engine
> so rotation is relative to speed, not RPM's. Mine had
> noticeable play at the
> spline at the transmission tailshaft, probably about
> .010".
> Fred TC1353
>
>
> -----Original Message-----
> From:
mg-tabc@yahoogroups.com
> [mailto:
mg-tabc@yahoogroups.com] On Behalf Of
> Kenneth Jones
> Sent: Friday, May 06, 2005 7:03 PM
> To: mg-tabc
> Subject: [mg-tabc] Propellor shaft spline
>
> Recently, I replaced the universal joints in my
> propellor shaft. At the same
> time I had the propellor shaft checked for balance.
> This did not eliminate
> an annoying vibration at about 3,700 RPM in top gear.
> The wheels had
> previously been straightened & tyres balanced & new
> wheel bearings fitted,
> front & rear with new front hubs, so I was fairly sure
> that wheels weren't
> causing the problem. The man who checked the propellor
> shaft balance, an
> oldtimer like me, came up with the comment that the
> vibration could be
> caused by a worn spline. He said that in his experience
> with MGs, if the
> spline is not noticeably worn, cleaning & then pumping
> in grease until it
> oozes out, will normally solve the problem (in 90% of
> cases). I thought "Oh
> Yeah", but tried it. It seems to have worked! Mind you,
> 4000 RPM in top gear
> was as fast as I was game to go around the area where I
> live, so I'll have
> to wait until I get on a motorway before I am sure.
> Has anyone experience with worn propellor shaft
> splines?
> Ken.
>
> [Non-text portions of this message have been removed]
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
--
Zkou ejte vysokorychlostn nonstop internet VOLN ADSL 14 dn
ZDARMA! Ji d le nev hejte! Prvn ch 500 z kazn k nav c z sk
tri ko.
V ce informac na
http://adsl.volny.cz/adsl-na-zkousku/
Propellor Shaft Spline
Posted: Sun May 08, 2005 3:23 pm
by Kenneth Jones
Hi David,
Thanks for your comments. The Clutch seems OK. as no undue vibration in 1st., 2nd. & 3rd. gears up to 4,500 RPM. The sort of vibration I was experiencing made me think I had double vision when looking at the instruments! I hope the cure persists, but it is still hard to believe.
Regards,
Ken
[Non-text portions of this message have been removed]
Re: Propellor Shaft Spline
Posted: Mon May 09, 2005 7:33 am
by ian thomson
Just a small (but perhaps important point)but are you
sure that the propshaft is correctly oriented? Both
U/Js should be in the same plane otherwise it
vibrates.
Ian Thomson.
---------
--- Kenneth Jones jonesks@optusnet.com.au> wrote:
> Hi David,
> Thanks for your comments. The Clutch seems OK. as no
> undue vibration in 1st., 2nd. & 3rd. gears up to
> 4,500 RPM. The sort of vibration I was experiencing
> made me think I had double vision when looking at
> the instruments! I hope the cure persists, but it is
> still hard to believe.
> Regards,
> Ken
>
> [Non-text portions of this message have been
> removed]
>
>
>
>
> Yahoo! Groups Links
>
>
>
mg-tabc-unsubscribe@yahoogroups.com
>
>
>
>
>
___________________________________________________________
How much free photo storage do you get? Store your holiday
snaps for FREE with Yahoo! Photos
http://uk.photos.yahoo.com
AW: [mg-tabc] Propellor Shaft Spline
Posted: Mon May 09, 2005 8:10 am
by Paroor
Dear Ian Thomson,
How can you do that ? Is there many possibilities to fix
the original propshaft ?
Madhu
-----Urspr ngliche Nachricht-----
Von:
mg-tabc@yahoogroups.com [mailto:
mg-tabc@yahoogroups.com]Im Auftrag
von ian thomson
Gesendet: Montag, 9. Mai 2005 16:33
An: Kenneth Jones;
fritz@pacbell.net
Just a small (but perhaps important point)but are you
sure that the propshaft is correctly oriented? Both
U/Js should be in the same plane otherwise it
vibrates.
Ian Thomson.
Re: Propellor Shaft Spline
Posted: Tue May 10, 2005 1:52 am
by Jeff Redman
Terry Mate...!
Great story... I could mimic it several times but I won't steal your
thunder on this one. I eagerly await the next instalment!
Reddo
-----Original Message-----
From:
mg-tabc@yahoogroups.com [mailto:
mg-tabc@yahoogroups.com] On Behalf
Of ian thomson
Sent: Tuesday, 10 May 2005 12:33 AM
To: Kenneth Jones;
fritz@pacbell.net
Cc: mg-tabc
Subject: Re: [mg-tabc] Propellor Shaft Spline
Just a small (but perhaps important point)but are you
sure that the propshaft is correctly oriented? Both
U/Js should be in the same plane otherwise it
vibrates.
Ian Thomson.
---------
--- Kenneth Jones jonesks@optusnet.com.au> wrote:
> Hi David,
> Thanks for your comments. The Clutch seems OK. as no
> undue vibration in 1st., 2nd. & 3rd. gears up to
> 4,500 RPM. The sort of vibration I was experiencing
> made me think I had double vision when looking at
> the instruments! I hope the cure persists, but it is
> still hard to believe.
> Regards,
> Ken
>
> [Non-text portions of this message have been
> removed]
>
>
>
>
> Yahoo! Groups Links
>
>
>
mg-tabc-unsubscribe@yahoogroups.com
>
>
>
>
>
___________________________________________________________
How much free photo storage do you get? Store your holiday
snaps for FREE with Yahoo! Photos
http://uk.photos.yahoo.com
Yahoo! Groups Links
Re: AW: [mg-tabc] Propellor Shaft Spline
Posted: Tue May 10, 2005 4:36 am
by ian thomson
The U/J yokes at either end of the propshaft must line
up with one another otherwise the inherent
non-linearity of the two hooke's joints will be out of
phase and cause vibration. At least that's the way I
understand it.
Ian Thomson
---
--- Paroor paroor@t-online.de> wrote:
> Dear Ian Thomson,
> How can you do that ? Is there
> many possibilities to fix
> the original propshaft ?
> Madhu
>
> -----Urspr ngliche Nachricht-----
> Von:
mg-tabc@yahoogroups.com
> [mailto:
mg-tabc@yahoogroups.com]Im Auftrag
> von ian thomson
> Gesendet: Montag, 9. Mai 2005 16:33
> An: Kenneth Jones;
fritz@pacbell.net
>
> Just a small (but perhaps important point)but are
> you
> sure that the propshaft is correctly oriented? Both
> U/Js should be in the same plane otherwise it
> vibrates.
>
> Ian Thomson.
>
>
>
>
> Yahoo! Groups Links
>
>
>
mg-tabc-unsubscribe@yahoogroups.com
>
>
>
>
>
___________________________________________________________
Yahoo! Messenger - want a free and easy way to contact your friends online?
http://uk.messenger.yahoo.com
Re: AW: [mg-tabc] Propellor Shaft Spline
Posted: Tue May 10, 2005 5:26 am
by 1939mgtb
Anyone who has ever removed a XJ6 driveshaft knows how important this step
really can be!!
Best,
Ray
"Morology is our profession,
our ONLY profession!"
----- Original Message -----
From: "ian thomson" i.thomson@talk21.com>
To: "Paroor" paroor@t-online.de>
Cc: "mg-tabc" mg-tabc@yahoogroups.com>
Sent: Tuesday, May 10, 2005 6:36 AM
Subject: Re: AW: [mg-tabc] Propellor Shaft Spline
> The U/J yokes at either end of the propshaft must line
> up with one another otherwise the inherent
> non-linearity of the two hooke's joints will be out of
> phase and cause vibration. At least that's the way I
> understand it.
>
> Ian Thomson
> ---
>
> --- Paroor paroor@t-online.de> wrote:
>> Dear Ian Thomson,
>> How can you do that ? Is there
>> many possibilities to fix
>> the original propshaft ?
>> Madhu
>>
>> -----Urspr ngliche Nachricht-----
>> Von:
mg-tabc@yahoogroups.com
>> [mailto:
mg-tabc@yahoogroups.com]Im Auftrag
>> von ian thomson
>> Gesendet: Montag, 9. Mai 2005 16:33
>> An: Kenneth Jones;
fritz@pacbell.net
>>
>> Just a small (but perhaps important point)but are
>> you
>> sure that the propshaft is correctly oriented? Both
>> U/Js should be in the same plane otherwise it
>> vibrates.
>>
>> Ian Thomson.
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
mg-tabc-unsubscribe@yahoogroups.com
>>
>>
>>
>>
>>
>
>
>
>
>
> ___________________________________________________________
> Yahoo! Messenger - want a free and easy way to contact your friends
> online?
http://uk.messenger.yahoo.com
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
Re: AW: [mg-tabc] Propellor Shaft Spline
Posted: Tue May 10, 2005 6:52 am
by E.Worpe
Hi Ian,
I believe you are correct. The universal joints are
not of the constant velocity type, and the front joint
introduces a modulation to the speed of the propellor
shaft. This modulation is reversed by the rear joint,
resulting in the restoration of a smooth angular velocity
due to the cancellation effect.
If, as you say, the joints are not in line, then an
incomplete cancellation takes place, resulting in vibrations.
I've come across quite a few propellor shafts that have
been dismantled and incorrectly re-assembled, and yet no
mention is made of this potential problem in the various
service books. What is strange, is the recommendation that
the flanges on the propellor shaft and the diff. and gearbox
should be marked to ensure they are re-assembled in the same
orientation. Can any one explain that advice?
Regards, Eric.
-----Original Message-----------------------------------
The U/J yokes at either end of the propshaft must line
up with one another otherwise the inherent
non-linearity of the two hooke's joints will be out of
phase and cause vibration. At least that's the way I
understand it.
Ian Thomson
---
[Non-text portions of this message have been removed]