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Post by Justy4x4 on Nov 21, 2008 22:19:22 GMT -5
I bought a '90 ECVT 4wd that just quit driving. I was told it worked fine right up until the tranny quit. The brushes and clutch spec out fine but the pump has very low line pressure even with the line pressure solenoid unplugged . Pump shaft is engaged, I checked. I've had the pan, filter and pump off and it looks like new inside (only 66,000 miles). The line pressure solenoid seems to be working fine and everything in the valve body checks out fine as well. It pumps plenty of volume just not enough pressure to do anything. It'll occasionally have enough pressure to engage/disengage the 4wd but won't do anything more than that. I'm thinking there's a massive internal leak passably at one of the pulleys. Any ideas on what I should look for? I'm hoping I don't have to disassemble another one of these, it's been 6 years since the last one I did! I don't remember too much from then.
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Post by urabus on Dec 9, 2008 1:35:59 GMT -5
Hey have you gone to Dustysjustys.com and downloaded the ECVT Subaru Manual? It has a lot of helpful troubleshooting tests that you can do w/o cracking the seal. I had a problem w/ my 90 justy only 57,000 miles. Would clunk into and out of gear then get stuck in the high range. The guys at Subaru tried all sorts of things from a new clutch, to cleaning the oil pressure valve. They said it was stuck in the high pressure range. None of it worked. They gave up. It turned out it was only the clutch cable and throttle cable housing needed adjustment. I bet your throttle and accelerator sensors need to be cleaned or de-oxidized. I bet you get a lot of salt on yer feet in the winter, and then go stomping on that accelerator pedal w/o wiping off your feet. What are you? a Viking? then pillage that manual and get to some exploring your cars best looting days are right ahead of you.
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Post by Justy4x4 on Dec 9, 2008 19:38:24 GMT -5
I do have all the factory service manuals for this Justy as well as the ones from Dustys site. Surprisingly none of them had any real info on the problem I was having. I did end up disassembling the transmission and found the hydraulic chamber on the secondary pulley had broke completely loose from the pulley resulting in total pressure loss. I do have a couple spare tranny's that I can rob parts from so I should be able to get it going again.
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Post by Justy4x4 on Dec 19, 2008 22:38:39 GMT -5
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Post by kd7iwp on Nov 24, 2010 23:55:04 GMT -5
Thank you so much for the photos! I just took the tranny apart on my '91 eCVT to figure out why it won't drive and these are very helpful. I'll post a few pictures from mine and I'm wondering if you could give me a bit of advice as well. The car just doesn't move when you rev it (I bought it this way). The brushes are fine and I believe the clutch is as well. It appears to engage 4wd when you hit the button (at least it lights up as if it has switched). If I jack the wheels off the ground they turn okay, but there isn't enough torque to move the car. No lights come on in the dash to indicate trouble. I don't have a way of testing pressure. When I opened the tranny I found this 5 inch long piece of metal from one of the bands in the drive belt, perhaps this is the problem? To be honest, the belt still looks okay from what I can tell, even though this section came out from somewhere.  Regarding the 2 pulley's, I have tried to remove the 35 and 36mm nuts on them but have only had success in removing the nut on the right since I can lock the pulley by putting it in park. I'm not sure how to remove the other pulley since the belt slips (is this normal when the engine is off?). I see in your pictures that you removed both the shafts that the pulley's are on. Any advice on doing that? I was able to get this end of the transmission off (the part with the fluid pump) but I don't know if I'll be able to get the other end of the transmission off or not since there aren't many places to grip it. Any ideas for that?  There are a few more photos of my transmission here: s669.photobucket.com/albums/vv54/kd7iwp/Justy/ |
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Post by Justy4x4 on Nov 25, 2010 9:27:35 GMT -5
Wow, you've been busy!!!
I take it you don't have the factory service manuals? Disassembling an ECVT without the manuals is a bit challenging. I did it once years ago with much difficulty. The manuals give you step by step instructions and make it very easy.
You shouldn't need to remove those large nuts. You have to remove the other case half first in order to remove the pulleys. That piece of metal is interesting. It could be one of the bands but I don't think this would cause it to stop working. There should be ten steel bands per side of the belt. Before removing the belt make sure you put some cable ties around it in a few places to keep it together. Also make note of the belts rotational direction, If you look closely at the inside of the steel plates that make up the belt you'll see a slight angle on one edge. This is why it has to be reinstalled the in same direction.
If the 4wd engages/disengages fine then there has to be some line pressure present. Mine wouldn't even do that due to the huge internal leakage. It does take a large amount of pressure to clamp down on the belt and make it go. I think it runs up to 440psi at full throttle and low speeds. As the vehicle speed increases and/or the throttle is reduced the pressure come down. Look for other signs of leakage.
Let us know what you find in their.
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Is your car an ecvt?