[TR] J-Type Overdrive oddity

[David Porter]

This is a bit of a guess. I'm thoroughly 'versed" on the early O/D's but 
over the years haven't had many opportunities to work on the J's. 
Anyway, I'm going to say that the long inactivity has degraded the oil, 
such that it is too viscose until it is warmed by the 10k of driving. 
The J has a relief valve which is "sensing" this condition and not 
engaging until the pressure drops. You may have used 80-90 gear oil in 
the gear box as well, exacerbating the problem . I'd drain both units  
and replace with 30wt non detergent or ATF or one of the modern 
specialist gearbox oils. Then see if the problem recurs.
Dave
PS You might contact Magnus Carlson over on the Healey list or Ted 
Schmacher on this list. They  may be more familiar with that J symptom

On 11/8/2014 1:58 AM, David Greed wrote:
> Hi there
>
>   
>
> It has been a while since I have been looking at these lists, so please
> forgive me if this question has been asked.
>
>   
>
> I have recently started driving my Stag again after a long period (5 years).
>
>   
>
> The overdrive is working, but only after the car has driven for about 10
> kilometers or so. Once it kicks in the first time, it works perfectly from
> thereon. The lock out switch was suspected, and the lucar connections to it
> were loose, so these have been replaced, but the switch itself has tested
> fine. I hope it is not some anomaly the switch, because it is a real pain to
> get to. (dropping the gearbox mounting frame which means undoing the from
> exhaust pipes.
>
>   
>
> My thinking is the gearbox oil and possibly the filters - thoughts?
>
>   
>
>   
>
> DavidG
>
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-- 
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 
87107 505-352-1378 Go HERE: my world www.porterbikes.com/