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Selespeed issue

663 Views 22 Replies 5 Participants Last post by  addo
Hello everyone,

I'm Nicolas from France and I joined the club of selespeed victims... I can't find any solution, or idea, in french communities so I'm trying here.

Here's the issue :
I have a GT selespeed from 2007. I had to replace the accumulator a year ago as I could only use 1st & 2nd gear. Everything was going well and after a while I had some other issues. After a few gear changes, pressure was dropping and the pump didn't start to get it right. I broke the bleeding screw trying to tight it up too strong, so the car didn't move for like 3 weeks. I replaced that screw and now I can't start the engine.

I checked with MES and the problem is the pressure that remains at 0.0000... the pump keeps running with no result. Then I replaced the pump but the problem isn't solved at all. Still 0 pressure in the actuator. And it's not the pressure sensor as when I unscrew the bleeding screw I have obviously no pressure (plus the oil level in the tank is not really going down).

It's like the entire circuit is always open and I don't understand why.

Pump relay is new, brake sensor is new. There's no air in the system.

Thank you if you have any lead. I hope it's all clear.
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If the screw bleed screw is out and the pump is running the fluid should be pissing out like a fountain and your reservoir would be empty in a matter of seconds. Your engine bay would be very oily. The bleed screw sits on the pressurised side of the system.

There is a filter that sits inline with the hose that pumps fluid in from the reservoir. This could be blocked, pictures below. The pressure coming into the circuit from the pump and the pressure sensor should be before the solenoids.

Essentially (as I understand it), fluid is pumped in, pressurises the accumulator (in red in the model) and triggers the pressure sensor, the solenoids operate and utilise the pressure which then goes to the return hose (in blue in the model).

The link below shows the hydraulic circuit in 3D (big thanks to whoever created it).


Automotive tire Bicycle part Rim Automotive wheel system Gear


Bicycle part Rim Automotive tire Gas Bicycle drivetrain part
 

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The OP said oil comes out with the bleed screw out but not how much. Is it a dribble or a pressurised squirt? In post #1 he says when the bleed screw is open there is no pressure, in post #4 he just says oil comes out.

You can tell if there is pressure in the system and the bleed screw is removed.
 

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If the screw wasn't sealing properly and the system was being sufficiently pressurised the oil would escape through it. I don't believe a poor seal on its own stop the system from pressurising.
 
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