[TR] Overdrive Quirk

[Dave1massey at cs.com]

I doubt it is the relay.  My first check would be the interlock switches on 
the top of the transmission cover.  I think that one is adjusted right on 
the threashold and as the transmission case warms up and things expand the 
amount of switch engagement changes from "just enough" to "not quite enough."  
Does it do the same thing in 2nd gear?

You can adjust the switch by removing one or more of the shims.

Dave

In a message dated 6/29/2012 8:21:48 PM Central Daylight Time, 
ghaynestr4 at aol.com writes: 
> Strange new problem with the overdrive in my TR4A.  When the engine's 
> cool,
> it works fine.  When warmed up - maybe 10-15 minutes - it has a tendency 
> to
> drop out while the OD relay inside the car chatters noisily.  It goes in 
> and
> out of overdrive at will.  I bought a new relay and experience the same
> problem but it takes longer to happen and remains in OD for longer 
> periods,
> but eventually drops out by itself.  Same relay chatter.
> 
> I thought I could use a relay from Radio Shack but cannot seem to make it 
> work
> at; it is intended to switch higher current, as in high-wattage headlights 
> or
> horns. I'll try that again, anyway.
> 
> The gearbox is filled with oil.  Could I have two bad relays?  What am I
> missing?