Power valve

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Saoirseanbothar
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Joined: Mon Apr 04, 2016 6:10 am

Power valve

#1 Post by Saoirseanbothar » Tue Jun 07, 2016 8:12 am

When I turn on the ignition the power valve mechanism goes through its opening and closing phase. But when it starts there is a slight stutter and then when it ends the stutter continues. The stutter only happens when the engine is not running. It seems to be the cable being tensioned and then loosened constantly.

Anyone got any ideas what the problem is?

Ta

Aaron

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phildu31
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Re: Power valve

#2 Post by phildu31 » Tue Jun 07, 2016 8:55 am

Hi.

It's rather likely that the YPVS control box is out of order.
Had the same symptom on mine.
Best is try another one if you can.
After you can get it repaired if possible by nick in Greece or go directly with a zeeltronic one.

Phil

Saoirseanbothar
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Re: Power valve

#3 Post by Saoirseanbothar » Tue Jun 07, 2016 9:49 am

Thanks Phil. I was looking at both of those options elswhere on the forum. I have decided that its probably best to test first and then decide what to do based on that. I am not sure about sending it to Greece rotfl. Zeetronic is probably the better answer all round if it cannot be fixed.

Ta

Aaron

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Rick Lance
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Re: Power valve

#4 Post by Rick Lance » Tue Jun 07, 2016 5:04 pm

You must have a full spec 5.5 amp battery that is fully charged and in good shape for the PV to cleanly cycle. Also, if the valves are gummed up with carbon and the linkage needs lube, it will not work smoothly.
If I disagree with everyone, that doesn't make me right. If I take the side of only one, it doesn't end the fight. If my position's strong enough from exposure to the light, you may see things my way when we share the same highway.

silverstrom
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Re: Power valve

#5 Post by silverstrom » Tue Jun 07, 2016 5:33 pm

Weak battery. Charge or replace and your problem will be gone.

MK
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Re: Power valve

#6 Post by MK » Wed Jun 08, 2016 11:38 am

This stuttering is usually caused by excessive carbon deposit on the valves.
I guess it won't be done by just charging the bat.

The controller tries to drive the valve down and up to the lowest and highest position.
If one of them takes too much torque it tries to loosen carbon by stuttering.
Also occurs if they're mechanically blocked like misaligned valve bore/bushings, rotten bowden cables, ....
In one case I have seen that effect with a faulty potentiometer in the PV servo. That one was jerking around the top position.

If you consider a Zeeltronics anyway, go ahead.
This unit is a good idea even if everything works, but u less your valves turn easily it won't cure your problem.
Bye
Martin

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phildu31
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Re: Power valve

#7 Post by phildu31 » Wed Jun 08, 2016 12:53 pm

Aaron, I understood that at power on the valves cycle normally.
In this case, it's at 99% a faulty controller.

If not, you'd better disconnect the cables on the servo motor.

Turn ignition on, the motor must go : open -> close -> open.
Start the engine, the motor must go -> close.
Stop the engine with kill switch, the servo motor must go -> open.

If that test is ok, your servo motor and controller box are ok.
-> Check the valves and cables ( and battery .... )

If not, check the electrical resistance values of the motor and potentiometer ( 2 pins + 3 pins. I'll give you the required values if needed )
-> If these values are ok, your control box is out of order -> Nick from Greece or Zeeltronics
-> If values not ok, change the servo motor ( or try an EXUP one )

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phildu31
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Re: Power valve

#8 Post by phildu31 » Wed Jun 08, 2016 1:12 pm

Potentiometer resistance values.
Image

silverstrom
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Re: Power valve

#9 Post by silverstrom » Wed Jun 08, 2016 3:04 pm

Just check the battery first before worrying about controllers and servos.

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phildu31
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Re: Power valve

#10 Post by phildu31 » Wed Jun 08, 2016 3:14 pm

Yes of course, but a weak battery will never make any stutter.

silverstrom
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Re: Power valve

#11 Post by silverstrom » Wed Jun 08, 2016 3:37 pm

phildu31 wrote:Yes of course, but a weak battery will never make any stutter.
My experience with many YPVS engines (RZ350 RZ500 TZR) shows it can and does. I've had it happen here many times. Whatever the case, it's easy enough to check before digging into the electrical system.

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