Sluggish overdrive engagement.

[lancepar]

Hi,

What is likely to be the reason for a sluggish engagement of a ‘D’ type overdrive?
The car was like it when I got it and the O/D works fine otherwise, but I am told it should engage in about three seconds.
Is it likely to be out of adjustment of the operating plunger? Can this be checked easily?
Anything simple I can check or try first?
Any links to further reading on this subject?

Cheers

8)

[CHRIS211083]

Hi, first thing is to Check the oil level in the box????

[lancepar]

Topped the oil up not long ago, only took a squirt of the oil can, didn't make any differnce.

Suppose I could drain the oil from the overdrive and gearbox and try a complete change of oil.

8)

[CHRIS211083]

It cant hurt, what oil are you replacing it with???

[lancepar]

Well the 'H'manual says SAE 90EP, assume this is ok, don't know what's already in there and  because I had some 80EP in an oilcan I only added a squirt when I checked it.
What should I be using?

8)

[CHRIS211083]

My haynes manual will say the same as yours sae90 sounds about right. Let us know how you go on?

[drofgum]

lancepar,
SAE80EP won't hurt anything; it is just a little thinner. Neither the gearbox nor the OD will show any difference except under the very highest temperatures.
Somewhere recently I saw a chart of various measures of viscosity. It turns out that normal engine oils and gear oils are very close in viscosity. The ranges overlap when they are compared.
                                                                         Cheers,
                                                                         Paul