| Slant Six Forum https://slantsix.org/forum/ |
|
| 1974ish band adjustment question https://slantsix.org/forum/viewtopic.php?t=28625 |
Page 1 of 2 |
| Author: | ceej [ Sun Apr 27, 2008 6:22 pm ] |
| Post subject: | 1974ish band adjustment question |
What is different in the 74 transmission that changes the band adjustment so radically? (Back off 7 turns?) The maiden voyage was short this evening. Three blocks. The transmission doesn't upshift. The transmission is out of a '74. The bands were adjusted like the earlier transmission. Could this be why it isn't shifting? I'm going to drop the pan and try adjusting it to the 74 spec first. We didn't open up the governer. That will be the second check. No Woodburn trip for me next weekend.  CJ |
|
| Author: | ceej [ Mon Apr 28, 2008 9:41 am ] |
| Post subject: | |
Further information: I put the selector in manual 2nd, and it still didn't upshift. I've read that the governer doesn't play into the equation when in manual second, but that doesn't make sense... I lifted my foot completely off the accelerator pedal. The Lokar is cranked way back, so goes completely loose at under 1/4 pedal or so. The bell crank at the transmission for the kick down is moving freely. The troubleshooting guide says: Fluid level, Governer, and Valve body. I can readjust the kickdown band adjustment if that could be the culprit. We adjusted it out of the car before bringing it home. Wit's end?  I still don't know how the transmission would react if the low/reverse band was too tight. The transmission has a nice positive feel to it. Reverse goes in nicely as does first. A bit harsh, but manageable. CJ |
|
| Author: | Fopar [ Mon Apr 28, 2008 10:29 am ] |
| Post subject: | |
When placed in drive, the manual valve opens mainline pressure flow from the regulator valve to the 1-2 and 2-3 shift valves, the govenor valve and the rear clutch. As the vehicle accelerates, throttle pressure increases. Governor pressure works against the 1-2 shift valve to block mainline pressure from the 2-3 shift valve and thus cause an upshift to second. As soon as governor pressure exceeds the throttle pressure, the front band is applied. Once this happens, mainline pressure waits for the governor pressure to move the 2-3 shift valve to obtain high gear. When the governor pressure moves the 2-3 shift valve, mainline pressure applies the front clutch. The front-band servo-release circuit branches off the front-clutch-apply circuit, and mainline oil is applied against both sides of the servo piston. Spring force and release oil pressure cause the servo piston to realease the band. When throttle pressure overcomes governor pressure, the shift valve cuts off the apply circuit to cause a downshift. Guess we should have inspected the Governor, instead of assuming it was OK. |
|
| Author: | ceej [ Mon Apr 28, 2008 10:36 am ] |
| Post subject: | |
When I get home tonight I'll drain it down. I couldn't work up the energy to drain it last night. Once the tailshaft is off the transmission, I'm a little foggy on the Disassembly process for the governer. Are you going to be around, or getting ready for your work week? CJ |
|
| Author: | Fopar [ Mon Apr 28, 2008 12:20 pm ] |
| Post subject: | |
I will be home tonite. Drain down fluid level, support transmission under the pan, pull drive line & transmission mount, also the speedo drive unit. Then remove the two screws (philip head) from the small metal plate under the trans mount on the tail shaft. Then remove the 6 bolts holding the tail shaft housing to the case, next use large snap ring pliers open the large snap rin and at the same time pull back on the tailshaft housing. This will enable the snap ring to clear the groove on the suport bearing. By this time I should be coming up the street. |
|
| Author: | ceej [ Mon Apr 28, 2008 2:30 pm ] |
| Post subject: | |
Cool! I'll have Linda put the Coffee on!  CJ |
|
| Author: | ceej [ Mon Apr 28, 2008 8:58 pm ] |
| Post subject: | |
The good news is; the governer is in great shape now! The bad news is; the tranny still won't shift. The question; What happens if the Low/Reverse band is backed off 4 turns instead of 7? CJ |
|
| Author: | ceej [ Tue Apr 29, 2008 7:30 pm ] |
| Post subject: | |
Couldn't find my Allen socket, so turned the L/R band adjuster out three additional turns. The band couldn't be wiggled at all before I did that. Not good. I remember adjusting it back 4 turns. I think I remember. Gah! The kickdown (Lokar) is adjusted all the way out now. I have to lift my foot all the way off the pedal to get it to shift. It goes into third if I keep my foot off of it. It'll take a light touch, but won't stay in third if I give it any reason to kick down. It won't stay in second with any pedal either. It didn't have that many yards on it while the L/R band was locked on. It shouldn't have burned the frictions out in that distance. Fopar is going to come up tomorrow, and we'll readjust everything. If we can't get it acting right, I'll put the old transmission back in. We'll see! CJ |
|
| Author: | MiDi [ Tue Apr 29, 2008 7:47 pm ] |
| Post subject: | |
i'll keep my fingers crossed for ya! i know you will get it shifting right! |
|
| Author: | Kidd [ Tue Apr 29, 2008 9:10 pm ] |
| Post subject: | |
Dosent sound at all fun Ceej......sorry to hear about this. I hope you and Richard get her figured out. Ona great and positive note!!!! I got my drag car fired up!!! Its still really ugly, and nota thing wired or bolted down.......or any brakes......but it starts. The clock is ticking, so I hope to have it in Medford to race you !!! Andrew |
|
| Author: | ceej [ Tue Apr 29, 2008 9:23 pm ] |
| Post subject: | |
First round, undoubtedly! Keep at it! We'll have two fresh builds to play with at Medford! Let's see, manual reverse valve body? That'll make the darn thing shift! Snort. Positive vibes. That's what we need. As long as I've still got my old tranny in the wings, I'll make it. This isn't getting my stronger rear axle installed. dang. CJ |
|
| Author: | Kidd [ Wed Apr 30, 2008 6:53 am ] |
| Post subject: | |
I am not sticking that manual reverse valve body trans in yet.......gotta iron some stuff out.....but I ave a 9' under mine......LOL, I just got my drive line back 4 days ago......so I am creeping up to it. Andrew |
|
| Author: | ceej [ Fri May 02, 2008 7:39 pm ] |
| Post subject: | |
It shifts! Fopar came up today, we yanked the transmission out after we tested and found the front band wasn't working right. All better now! It seems to go down the road OK, so tomorrow, I'll try it out in a different venue!  Back out to do an oil change and figure out how the Lokar cable routing is messing me up. The bell crank is hitting the cable. It didn't do that before. Hmmmmm. Working on Cars! CJ |
|
| Author: | DusterIdiot [ Fri May 02, 2008 9:16 pm ] |
| Post subject: | Lol... |
Quote: The bell crank is hitting the cable. It didn't do that before. Hmmmmm.
You had to go and change your bushings and tranny mounts didn't ya!I know the Hpak duster has a bit more vibration in the passing band since I replaced the motor mounts and tranny mount with new bushings (engine seems to sit a bit higher too....  -D.Idiot |
|
| Author: | dank10fenny [ Sat May 03, 2008 3:37 pm ] |
| Post subject: | |
what part of the trans circuit wasnt right? band adjustment, valve body, cmon, details |
|
| Page 1 of 2 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|