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Nov 28, 2022 14:45:30 GMT
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It's even clean inside.   We'll see what the weather does this afternoon- clouds are threatening rain so it may yet be cancelled but I'm going to try put it in after work. |
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jimi
Club Retro Rides Member
Posts: 2,223 
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Nov 28, 2022 15:26:12 GMT
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looks like new  |
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Black is not a colour ! .... Its the absence of colour
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The new valve block solved two things.
One, it no longer crunches into reverse.
Two, it no longer shudders in top gear (I think it was partially engaging two gears at once).
It has not solved the 1-2 shift when hot.
That leaves one final thing- the front servo or band is physically getting hung up and refusing to engage.
I can pull the servo out without having to remove the transmission, if memory serves.
Phil
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Last Edit: Nov 29, 2022 1:03:25 GMT by PhilA
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Can't be the servo, not the way it's plumbed.
Now I'm confused.
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glenanderson
Club Retro Rides Member
Posts: 4,353
Club RR Member Number: 64
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1951 Pontiac Chieftainglenanderson
@glenanderson
Club Retro Rides Member 64
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Getting closer. 👍
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My worst worry about dying is my wife selling my stuff for what I told her it cost...
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I'm sure you covered this phil , and i might have already mentioned it way back in the thread , but just in case , in the TVR , on th c4 i converted to a clutch , if the band adjusters were a little bit wrong ,then going from 1st to 2nd it would get both the disengaging 1st , and the engaging of 2nd, too close together , and try to have both at the same time ,this would instantly lock the rear wheels . could it be that 1st is not disengageing properly ? like i said you have probably been over this already .  regards robert |
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Nov 29, 2022 13:20:59 GMT
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I'm sure you covered this phil , and i might have already mentioned it way back in the thread , but just in case , in the TVR , on th c4 i converted to a clutch , if the band adjusters were a little bit wrong ,then going from 1st to 2nd it would get both the disengaging 1st , and the engaging of 2nd, too close together , and try to have both at the same time ,this would instantly lock the rear wheels . could it be that 1st is not disengageing properly ? like i said you have probably been over this already . regards robert That's one thing it doesn't do. It is just not changing gear when it should. It'll hold first then bypass 2nd and thump into third, which is quite violent because of the engine speed being higher than it should be for the road speed. |
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Nov 29, 2022 13:30:35 GMT
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I am going to pull the governor out again, see if that's full of dirt or has any burrs on.
Cold though, it shifts very nicely.
Phil
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Last Edit: Nov 29, 2022 13:33:31 GMT by PhilA
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Nov 29, 2022 18:25:11 GMT
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This is why I paid someone else to do mine - I'll attempt 99% of building a car but gearboxes are voodoo magic, lol.
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Nov 29, 2022 20:00:02 GMT
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hols on didnt that girl have a song about the governor ? oh yes ..  oh opoh , she only says governor once , so that doesn't really count . as you were . |
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Last Edit: Nov 29, 2022 20:07:02 GMT by ivanhoew
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This is why I paid someone else to do mine - I'll attempt 99% of building a car but gearboxes are voodoo magic, lol. This is expanding my understanding of the thing, slowly. I could probably have learned more by now, but somehow I failed to. Either way, it's been cheaper to try figure it out myself... |
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Nov 30, 2022 15:46:10 GMT
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The front servo is held off with a spring, but is activated in both directions by hydraulic pressure, both on and off.
The rear band servo is held on with a spring but again operated in both directions by hydraulic pressure.
In both instances, the springs merely assist and/or apply the rear band with the engine off.
The compensator pressure which is added by stepping on the throttle does two things- firstly it is applied in progressive amount to assist in forcing the bands to engage. Secondly, it boosts the overall main line pressure from 60 to about 80-85 psi in the early stages of the throttle being opened, so that will vary the force on the parts too.
However, I looked at the way the 1-2 change operates. 1st is engaged when Drive is selected, by applying pressure to the servo only, engaging it and clamping the band on (and clutch off so the sun can rotate and perform ratio reduction).
When the 1-2 shuttle moves over, that is a single line of pressure to both the servo and the clutch.
The clutch will then engage, and a bit of physics is used for the servo- the other side of the piston is larger so the servo is forced disengaged, loosening the band and then the sun turns at the same speed as the input shaft.
If the servo was sticking, the clutch and the band would both be engaged and the gearbox would lock up solid (two gears at once).
It's definitely not doing that, so all I can surmise is that is not getting the instruction to change- either there's inadequate pressure to push the valve over against the spring or this is getting stuck in exactly the same way (not so likely).
Thus, my attention turns to the governor. Which was new 5000 miles ago. I guess new does not equate non-problematic...
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The weather was wrong for doing too much to the car, so I pulled the radio out as it was sounding all crackly and quiet.  The speaker fader switch was all fusty, so I cleaned it up, which seemed to help a lot.  That was a little too anticlimactic so I left it overnight on the bench.  I set about realigning it, because why not, it's been in the car two years and it's probably all out of tune. Reset the IF there, the older 260kHz standard.  All tweaked and peaked. Reception on the AM is improved. It was good before but now it's a fair bit better. Stuck it back in the car and awaiting a non windy, non rainy day to pull the gearbox apart again. |
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Working on cleaning up the clock escapement.  The contact points had become dirty and the clock wouldn't start itself. Phil |
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Always interesting to read your threads. You have a large range of technical skills. Like Mark, i do every thing myself but automatic transmission, i let someone else do it
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Phil,
What do you actually do? All those test units are not the fayre of an average person!
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jimi
Club Retro Rides Member
Posts: 2,223
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Going by the oscilloscope, signal generator etc, I'd guess something electrical/electronics related ?
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Last Edit: Dec 4, 2022 17:11:04 GMT by jimi
Black is not a colour ! .... Its the absence of colour
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Phil, What do you actually do? All those test units are not the fayre of an average person! I work for our local cable company. |
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I knew I’d see you somewhere before.  |
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1955 Austin A30
1981 Jawa Mustang
1990 Trabant 601 (Tommy)
1989 Trabant 601
2009 Jaguar XF
2012 Toyota AYGO
2018 Scomadi TL
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Clock is now on the bench, undergoing test.  Phil |
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