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Shade Tree Mech here

BeepBeepRR said:
My mom and dads was a 28 footer. I have some pictures of it in my old photo album I will have to take pictures of the pictures. The only reason I would want it is for the memories.. But then again having a hulking vehicle sitting in my yard would be crazy.
Click to expand...
I understand what you're saying about the memories. If you have good memories of your folk's RV, I suspect you will probably want to have an old AVCO some time. I plan to get it up and running, but it's more than I really need. Thus, my willingness to part with it. If you have kids, I know you'd have a lot of fun with an old RV. That is, if you are willing to spend a lot of time trying to keep it up and running. There is a story behind this rig. I've had it for many years, yet never had it more than two miles away from home. It only took two miles to fry the rear clutch. I think it was fried before I took possession of it, I just didn't know it. This is my first auto trans disassembly. I have never seen any thing on you tube that rivals the four clutch plates and steels I took out of the rear clutch pack, and you tube just can't convey that burnt oil stink. Actually, I think it's the friction material that adds all the flavor. One pic is what's left of the clutch components. the other is fragments of the plastic ring. It melted.

DSC04777.JPG DSC04779.JPG
 
1 Wild R/T said:
Those trees in the background don't provide much Shade...To be a Shade Tree Mechanic you'll need better trees.... I'll help ya out....

View attachment 1130142
Click to expand...
OK, I get it, you're looking at the trees in the MH pics. Those are soft maples and are decidedly unreliable. There is a tree next to the pole barn that provides the shade. I really love the shade in the summertime. It does get hot here. Do you sell trees, or are you interested in the trans? I really need help with the trans. The post to my guy in Atlanta describes the results of some problem inside. I've got everything apart. I don't see anything obvious. I.E. no broken seals, damaged pistons, siezed bushings, nothing. One question from my inspection so far. I have determined that the rear clutch housing and the pressure plates are all warped. They are all out of flat by .003 to .004. Question is: will the trans tolerate this slight out of spec. I plan to replace the top and bottom pressure plates, but the housing, I think it would be ok. There are no real bearing surfaces associated with it.
 
Before you tore it down you probably should have air checked the clutches & bands... You say you didn't see anything but either there was a internal leak of hydraulic fluid or there's a problem with the valve body... The rear clutch is used with all forward gears but not reverse... Have you removed the apply piston & inspected both seals? Fluid flows from the valve body, through the case into the front pump passage into the stator support.. Where the fluid flows into the rear clutch housing there are a couple sealing rings.... If the clutch fails (It obviously did) it's usually due to a loss of fluid pressure applying the clutch...

Make sure you flush the cooler & lines

Screen Shot 2021-06-27 at 9.26.23 PM.png
Screen Shot 2021-06-27 at 9.26.23 PM.png
 
ckessel said:
Welcome. My oldest bro lived in Albert Lea. FYI, some of those early rv trannies contained the 2.77 low gear set. You may have a rare piece there in case you get it out for rebuild.
Click to expand...
Will the code stamped on the side of the gasket flange tell me what's up with that? Fortunately, the gears appear to be in good shape, at least good enough for a 135M MH. I.E. no teeth chipped. Plenty of shiney wear though. I'm not too far from Albert Lea. I did get lost there trying to find a gas station. The city is a mile or two away from the freeway.
 
First...
newwelcome.jpg


Second....lookit, it's an old transmission that's obviously had some sitting time in its' history.
Find a good reputable shop to rebuild it and be done with it.
My 2 cents.
 
1 Wild R/T said:
Before you tore it down you probably should have air checked the clutches & bands... You say you didn't see anything but either there was a internal leak of hydraulic fluid or there's a problem with the valve body... The rear clutch is used with all forward gears but not reverse... Have you removed the apply piston & inspected both seals? Fluid flows from the valve body, through the case into the front pump passage into the stator support.. Where the fluid flows into the rear clutch housing there are a couple sealing rings.... If the clutch fails (It obviously did) it's usually due to a loss of fluid pressure applying the clutch...

Make sure you flush the cooler & lines

View attachment 1130719 View attachment 1130719
Click to expand...
Thanks for the info on how the whole thing works, and the chart. It gives me greater insight into what and where to look. Right now, I'm focused on the pump. There is no polish on any of the surfaces. I'd say it must have sucked up some sand at some time in it's past. I can machine the stator back to smooth fairly easily, but the housing will take some set-up time. OR, should I just get a new/rebuilt pump assembly? I did a quick lap of the inside gear to ID the high points. A quick check of the low points with a 1/16th dia ball end of a dial indicator shows a drop in the topography of .0003 to .0005. Is that enough to drop the pump pressure to dangerous levels? I will replace the pump.

DSC04782.JPG
 
Last edited:
Shade Tree Mech said:
Thanks for the info on how the whole thing works, and the chart. It gives me greater insight into what and where to look. Right now, I'm focused on the pump. There is no polish on any of the surfaces. I'd say it must have sucked up some sand at some time in it's past. I can machine the stator back to smooth fairly easily, but the housing will take some set-up time. OR, should I just get a new/rebuilt pump assembly?
Click to expand...


Either pick up a reman pump or grab a core trans.. Lotta good spare parts for cheap...
 
1 Wild R/T said:
Either pick up a reman pump or grab a core trans.. Lotta good spare parts for cheap...
Click to expand...
I'd get the spare 727, but I'm trying to downsize. I have a lakeshore lot up north. Thus the need for a functioning MH. OBTW I have a 318, mid seventies vintage. reworked heads for unleaded, mildly ported, about 30M. 2 BBL. with manual four speed. AND a late 50's 354 hemi, disassembled with bell housing and trans. I know this is the wrong place to put this, but then I'll have two threads to manage and I don't want to do that right now. I have a tranny to fix.
 
moparedtn said:
First...
View attachment 1130765

Second....lookit, it's an old transmission that's obviously had some sitting time in its' history.
Find a good reputable shop to rebuild it and be done with it.
My 2 cents.
Click to expand...
Thanks for the contribution. I know that's good advice for some, but I'm a shade tree type. I really don't do cars much. I do lathes and mills. You know, like, I'd rather shoe the horse than ride it. My show pieces are out working somewhere. My first time in a 727. What a fascinating piece of machinery. Now I've got to unravel the mystery of the valve body. There must be a pressure regulator there somewhere.
 
welcome

maybe post this in the
Engine trans driveline forum section too

good luck
 
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