In addition, the switch opens between 3rd and 4th so the solenoid, unless
there is some design feature to prevent it, has to disengage. Have you
hecked you master cylinder, slave cylinder, clutch and pressure plate,
flywheel, thrust washers, Input shaft/bearing, needle bearing between the
mainshaft and input shaft, etc.
Andy
On 06/03/98 05:17 PM Peter Zaborski said...
>> From: Andy [SMTP:adixon@loudoun.com]
>> Sent: Wednesday, June 03, 1998 5:05 PM
>>
>> Can't say much about my present TR6, it's merely a shell (and a rusty
one
>> at that). But my previous one did not appear to drop out of overdrive
>> between 3rd and 4th.
>>
>I am not clear on what you mean by this. During normal shifting, my car
does
>not *appear* to drop out of O/D either. What I mean is that when I have the
>O/D on and I am in 4th, I can downshift to 3rd and the O/D appears to stay
>on. Likewise for the 3rd to 4th shift. I say appears because although there
>is no discernible jerk as the O/D dis-engages and re-engages when the
>gearbox is put in gear, I know that the solenoid loses its power for the
>brief time the gear shift lever is in between gears. The shift does appear
>to be smooth however. If I didn't have the O/D indicator in my car, I would
>not know that the solenoid was briefly losing power.
>
>I pressure tested my O/D recently during just such a shift sequence and
the
>normal pressure of my O/D is 470psi when engaged. During the shift the
>pressure briefly dropped to 450psi and then shot back up to 470psi. I
guess
>that the drop to 450 is not sufficient to dis-engage the O/D. (When the O/D
>is off the pressure is about 15-20psi).
>
>So two possibilities why your O/D appeared to stay on are: either your
>previous TR6 had a different switching mechanism than mine or you were
>simply not aware that the solenoid was losing power but the O/D remained
>engaged. It could also be something I have not considered. FWIW, my car
is a
>stock 76 with the factory J-type O/D.
>
>I won't be able to do any more testing on mine until the weekend but I am
>really curious if maintaining the power to the solenoid on during the 3-4
>(and 4-3) shift will remove the grind (I only get the grind on the 3-4
>shift, with O/D on).
>
>Peter Zaborski
>76 TR6 (CF58310 UO)
>Calgary AB Canada
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