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Triumph Torque    Cars    Herald/Vitesse  ›  Overdrive not engaging in 4th, but does in 3rd
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Overdrive not engaging in 4th, but does in 3rd Print
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mazfg
October 8, 2017, 2:37pm Report to Moderator


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Just been out for what will probabaly be the last spin  of the year. Was fine on the drive out but on my way home, I found that I couldn't get overdrive in 4th. Goes in (slowly) with 3rd, if I then select 4th it comes out of overdrive?  If i'm in 4th and then select overdrive, I get nothing?  Relay is working ok/ clicking ok
Could it be the solenois or something more sinister?

I'm about to take the whole thing out anyway and get it refurbed (again).

Any help appreciated.


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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mazfg
October 8, 2017, 3:14pm Report to Moderator


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Just to add to that..taken it out again and found that it will engage in 4th but as soon as i go over 40mph it goes in and out (judders) and then stays out. Obviously the higher speed is causing it to disengage?


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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Paudman
October 8, 2017, 5:25pm Report to Moderator

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Is your oil level alright? Top it up and try again.
Failing that it may be wiring chafing or loose; at higher speeds wind resistance or vibration may stress the wiring and cause it to lose connection.


If it was made by man, it can be dismantled and rebuilt by man. Usually just not as easily.
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mazfg
October 8, 2017, 6:02pm Report to Moderator


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I'll check the oil, but never had a problem with the level. Been driving it all summer and this is the first time it's done this. I'm removing at the moment anyway, so i'll see how much oil comes out???  Otherwise will re-check the wiring continuity. Thanks


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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mazfg
October 9, 2017, 11:50am Report to Moderator


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Checked the oil and it's at the right level.


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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John Bonnett
October 9, 2017, 2:49pm Report to Moderator


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Well worth checking that the cable that passes through the centre of the gear lever hasn't worn through the insulation and intermittently earthing.


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RobPearce
October 9, 2017, 3:22pm Report to Moderator

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If it's an original Vitesse installation there is no wire through the gear lever - the switch is on the column. You can still get problems with the wire but they're not usually gear-sensitive.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
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mazfg
October 9, 2017, 3:39pm Report to Moderator


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I have the lever on the steerign column. This all seems to work ok..


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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Nick Jones
October 9, 2017, 5:56pm Report to Moderator

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With hydraulic problems, usually the problem goes the other way.  If you push on to higher speeds in third does it drop out then too?

If it does, possibly the strainer is blocked.  The pump is driven by the mainshaft and varies with road speed.  At lower speeds it may be able to just draw enough oil through.  At higher speeds it will be trying to draw more but perhaps failing to overcome the increasing losses and drawing air from the top/cavitating.

Would be a reasonably easy fix though the question of what was causing the blockage and why would arise......  Black "fur" from the clutch linings is the usual culprit.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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mazfg
October 9, 2017, 5:59pm Report to Moderator


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Thanks for that Nick.  I did clean the strainer out in the OD back in February. it was quite gunked with that silvery grey liquid..
I'll have another look tomorrow.


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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mazfg
October 9, 2017, 8:05pm Report to Moderator


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Just checked the strainer. .not clogged up.....oil again was quite silvery grey tthough.


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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Matt306
October 9, 2017, 9:56pm Report to Moderator

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silvery oil sounds like something is breaking up in the OD.

The OD works on a Cam on the Mainshaft driving a pump, when the solenoid engages it lifts a ball bearing and lets the fluid into two pistons pushing them forward against springs and pulling the cone clutch forward.

A low pressure may cause this, and this can be shimmed, could be your pump on its way our which to replace could be done from under neath.

The manual talk of a special tool..... however i botched something with a 1/2" pipe union to remove mine.

I would check the solenoid and electrics first.


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Pete Lewis
October 10, 2017, 6:38am Report to Moderator

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Do the simple first  this sounds a classic case of inhibitor switch adjustment
theres no conection between gearbox selection amd overdrive operation
other than wires down the gear stick (not in this case) and the 3rd 4th inhibitor switch
Bet if you   side load the gear stick you will make this worse or better
so remove a shim  washer from under the switch and retest if  the switch is bracket mounted it may need some gentle adjustent
Pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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mazfg
October 10, 2017, 7:08am Report to Moderator


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I've buzzed through the cable and will try the switch again whilst jiggling the gearstick.....but it seems to look all good


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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Pete Lewis
October 10, 2017, 11:38am Report to Moderator

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this switch can give lots of interrupted if not making good plunger pressure , its only a bell push inside  and they can be quite corroded
if its a simple crimped case you can disassemble and clean but some later ones are sealed for life  what ever that gives.
the fact it plays up differently in 3rd to what happens in 4th is got to be selection related not overdrive related
the OD doesnt know what gear youre in
Pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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Triumph Torque    Cars    Herald/Vitesse  ›  Overdrive not engaging in 4th, but does in 3rd

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