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Felix

Overdrive slow to engage.

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During a long run the J type overdrive was becoming slower to engage taking a good few seconds. After an overnight rest the overdrive engaged once more before stopping altogether. The oil level was checked but still no change. Did not have facilities to check anything else while completing north coast 500.

Any areas I should check first would be appreciated.

Craig

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Hi Craig,

there is an alignment jigging hole on the righthand side of the OD. When engaged the holes should align.

The solenoid pull in stop (lefthand side) may be slackening off and going out of adjustment.

 

Filter clogging up. Drain, remove, clean.

 

Can you hear the solenoid and relay clicking in?

 

What GB oil do you use.?

 

GB40 works well but may leak more

GB90 works but may leak less

20/50 Engine oil works but may froth depending on type/make and aerate the oil - this will cause a sluggish/no response

 

Roger

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Hi Felix!

 

Check electrics first? I have had at least 4 s/column switches in 43 years on my J type and bullet connector(s) under centre of dashboard above G/B tunnel, as they can pull out. Lastly ,as Roger says, check solenoid operation. I have never had a problem with the interrupter switches

 

Bruce..

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Guest ntc

Hi Craig,

there is an alignment jigging hole on the righthand side of the OD. When engaged the holes should align.

The solenoid pull in stop (lefthand side) may be slackening off and going out of adjustment.

 

Filter clogging up. Drain, remove, clean.

 

Can you hear the solenoid and relay clicking in?

 

What GB oil do you use.?

 

GB40 works well but may leak more

GB90 works but may leak less

20/50 Engine oil works but may froth depending on type/make and aerate the oil - this will cause a sluggish/no response

 

Roger

:o:P:lol::lol::lol:

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I use GB40 oil and it has only recently been replaced. I have just tried the solenoid by putting in 3rd gear and ignition on. I can hear a click going on and off when stalk put on & off. Under car to check filter next???.

Craig

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I use GB40 oil and it has only recently been replaced. I have just tried the solenoid by putting in 3rd gear and ignition on. I can hear a click going on and off when stalk put on & off. Under car to check filter next???.

Craig

Craig, If you're short of time I once used a ali coat hanger to fashion a hook that could be tugged by the driver to assist the solenoid's action to engage the o/d. It switched out of o/d as normal. Peter

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Not on a J type Peter.

Thanks Peter, my mistake. I must have used that trick when I had the A-type o/d fitted temporarily. Long time ago... Peter

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Hi I had a similar problem with my 1974 TR6 the overdrive would drop out then re- engage again after a few seconds. The spade connector onto the solenoid was loose / corroded. 42 years old. New spade terminals & new earth lead fixed the problem.

So check there first.

 

Alec

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The bad news is that the pressurized oil gets lost somewhere

on its way to the pressure pistons.

 

The good news is that you get access to many more items from

the outside than former at the A-Type.

 

It can be the solenoid that best is swapped to a good working one

for a test. Mostly this is not the problem.

 

Next is the bottom plate to be removed.

In the middle is the pump bottom that should be inspected for the ball

and the spring and the ball seat.

 

On one side is the filter that should be removed and cleaned.

 

On the other side is the pressure valve that was the culprit in many

cases when I had to repair an item.

Unfortunately the fitted rubber rings are from wrong size and do not fit

properly just from the beginning and get worse over the time.

Needs some experience which rubber ring is able to do the job properly.

Do not fit the new rings just because they had been delivered

in the right box. They will be sometimes too small.

Edited by TriumphV8

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Cheers to all who replied,

 

The problem turned out to be a simple spade in the engine bay that did not even look corroded. Removal and replacement of the spades was enough to make it operate again as it should.

 

Craig

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