[Healeys] Overdrive slow to engage when hot

[Austin Healey]

How fast do You loose the pressure after switching off the engine hot/cold?

G

2011/9/12 Austin Healey <pajtamuvek at gmail.com>

> Maybe worn ball or seating/weakend spring at the valve.
>
> G
>
>
> 2011/9/12 Thomas Willig <twillig at ruda.de>
>
>> Gentlemen,
>>
>>
>>
>> I am facing the problem that the Overdrive on my BN2 is quite slow to
>> engage  when the gearbox is hot. Here are the symptoms /parameters:
>>
>>
>>
>> 1.    I am using Penrite 30 gearbox oil -a non detergent oil
>>
>> 2.    I installed a OD pressure gauge that can be read when driving the
>> car.
>>
>> 3.    Gearbox / Engine cold,  pressure is 490 Psi -Looks perfect to me
>>
>> 4.    OD engages faultlessly
>>
>> 5.    Gearbox / Engine warm (Engine Oil 200 F) OD pressure 360 Psi -Too
>> low.
>>
>> 6.    The overdrive needs about 4-5 seconds to engage in other words the
>> OD pressure takes that long to reach the 360 Psi again.
>>
>>
>>
>> ?  Am I facing a worn oil pump? Any advice what I can/should do.
>>
>>
>>
>>
>>
>> Best regards
>>
>>
>>
>>
>>
>> Thomas Willig
>>
>> BN2L-230649   01. Feb. 1956
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