Using the overdrive

[Arbman Al]

On the way back from the Surrey N & N last night, I was in 4th and o/d, came to a junction and forgot to switch o/d off before changing down to third then 2nd.

Had a bit of a screeching noise for a while afterwards, which stopped ifI pushed the clutch pedal down.

Have I done something bad??

Rgds...Al.

[comeinhandy]

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Unlikely to be an overdrive issue, they are fairly robust and only get engaged in 3rd and 4th. Since it disappears when you press the clutch It sounds like the clutch release bearing needs changing. It has probably dried up and worn out.

[Arbman Al]

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The clutch has only just gone back in after my restoration.

It has the long nose and also the groove for extra grease, so unlikely to have dried out by now - only done 300 miles:shock:

If the o/d is switched on and you change into second or first what happens?

Does it automatically switch off?

Rgds....Al.

[GDPR]

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It should switch off if the inhibitor is set right..... however the only time you need to really panic is if you put it into reverse with the overdrive actually engaged.....

Otherwise having on in first is unwise, but 2nd 3rd and top was common in many TR's

[Arbman Al]

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kryten wrote:

It should switch off if the inhibitor is set right..... however the only time you need to really panic is if you put it into reverse with the overdrive actually engaged.....

Otherwise having on in first is unwise, but 2nd 3rd and top was common in many TR's

Thanks Russ.

It only works in 3rd and 4th so inhibitor seems to be working ok. Didn't put it in reverse any way, as I was trying to go home, not back to the pub

Al.

[stagstr]

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comeinhandy wrote:

Since it disappears when you press the clutch It sounds like the clutch release bearing needs changing.

If it was the release bearing wouldn't itappear, not disappear, when the clutch was depressed?

I think it's more likely to bethe bearing on the input shaft.

Ray

[Arbman Al]

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Oh bu**er!:X
Atleast I could sort out my oil leak at the same time.
Al.

[mickl]

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kryten wrote:

It should switch off if the inhibitor is set right..... however the only time you need to really panic is if you put it into reverse with the overdrive actually engaged.....

Otherwise having on in first is unwise, but 2nd 3rd and top was common in many TR's

What damage can be done if you do this? been driving a stag for nine years now and accidently did it the other day for the first time:?.

mick l

[comeinhandy]

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The inhibitor switch disconnects the overdrive switch when in anything other than 3rd or 4th, so it shouldn't matter.

[Andy Rundell]

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mickl wrote:

What damage can be done if you do this? been driving a stag for nine years now and accidently did it the other day for the first time:?.

If the overdrive was actually still engaged when you selected reverse, and you then moved the car under its own power for more than a couple of feet you will have toasted the OD. The inhibitor switch is your protection - it stops the OD engaging in all gears apart from 3rd and 4th.

.....Andy

[Arbman Al]

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Hi Guys,

Could someone post a Rimmers picture showing which bearing is the input shaft bearing.

Many Thanks

Al.

[Thurlo Squire]

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stagstr wrote:

If it was the release bearing wouldn't itappear, not disappear, when the clutch was depressed?

I think it's more likely to bethe bearing on the input shaft.

Ray

It's normally the other way round. Clutch release bearings rattle when not under pressure and then the noise goes away once some pressure is applied to the pedal and thus the bearing.

Nigel

[Thurlo Squire]

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arbman101 wrote:

Hi Guys,

Could someone post a Rimmers picture showing which bearing is the input shaft bearing.

Many Thanks

Al.

Al

Part No 58391 in the drawing although I would suspect the release bearing if it is screeching and then goes away when you press the pedal.


Nigel

[Arbman Al]

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Thanks Nigel,
Either way the box has to come off, so will find out in due course
Rgds....Al

[robertt1948]

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I remember my days of owning a TR3A with o/d on 2nd, 3rd and top. Same Laycock unit as the Stag, but the low gear of 2nd and the torquey TR engine caused the o/d to slip if too much welly was given with the right foot. So 2nd o/d was rarely used.

If the overdrive were to be driven in reverse I think you are trying to turn theunidirectional clutch the wrong way - nasty.

I know the electrical interlock should prevent this but what would happen if you accidentlyrolled the car backwards in, say, top gear and o/d engaged on a hill. Would this destroy your o/d?

Just a thought.

Robert