DIY: Vanos Solenoid Repair - Page 13 - BMW M5 Forum and M6 Forums
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post #121 of 179 Old 27th February 2016, 06:54 PM
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Originally Posted by liquidsmoke View Post
Was there a consensus for good replacement diodes/movs? My electrical knowledge ends with wiring a plug.
Not yet but the best guess seems to be diode1N97, there are still some unanswered questions? Some questions I still don't understand, so not sure if they have been answered.

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OK, so what is the correct power supply to be used in testing the solenoids?
Still working on that question but it appears a 9V battery is safe, except that when you are cleaning the noid and holding it open for a long time you might want to desolder one side. Protecting the diode is the reason for this.
That said I have always used an old charger for a flip phone. It puts out around 5v and much lower amps, think it is 2 amps. The issue is burning out the diode and the more watts you put through the more likely that is. The diode is rated at 150 watts non continuous and a 9V battery has 4 amps so that is 36 watts. W=AxV . A 5v charger at 2 amps is only 10w, much safer.You can use a voltage as low as 3.2v but the lower you go the less force applied. Force helps dislodge the crud.
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post #122 of 179 Old 27th February 2016, 08:23 PM
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what would happen if you used a spare car battery to test the noids? In theory?... Lol.
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post #123 of 179 Old 27th February 2016, 10:37 PM
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You would likely burn the diode and maybe even the noid if you held the power on for more than a millisec. 12v x ~1000a = 12000 watts well over the spec of the diode but I am sure over the noids rating too. Would not burn up the noid instantly but as the wire got hot who knows what would happen.
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post #124 of 179 Old 27th February 2016, 10:49 PM
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I actually just finished servicing the the solenoids today. I used a 9 volt battery to test the noids. Seemed to work pretty well and I could tell a huge difference in the way they sounded before and after cleaning. Tomorrow I will reinstall the unit with new seals and hope the vanos rattle noise goes away.
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post #125 of 179 Old 27th February 2016, 11:08 PM
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Word of advice that is not in the DIYs. Once you have the board in, rotate the noids so the wires are tightish. This will prevent the wires from getting pinched when the cover goes back on. Also oil up the o rings to make the install easier. Recently there have been a few torn on the install.
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post #126 of 179 Old 27th February 2016, 11:18 PM Thread Starter
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Quote:
Originally Posted by liquidsmoke View Post
what would happen if you used a spare car battery to test the noids? In theory?... Lol.
I've used a 12v current limited lab supply as well as a 9V battery with no issues. I've not tried the car battery but even a weak one can supply a couple hundred amps for a short period of time. I remember at least one member saying that he burned the mov/diode using a car battery, so no theory there.

The thing to remember is that the solenoid is fed a PWM signal at some frequency. That means the RMS voltage is somewhat less than the supply voltage which affects the power being dissipated. All in all a 5-9 VDC supply seems to be the safe way to go.

When I catch up on my honey-do list, I'll throw the 0-scope on the solenoids and capture some signals at different rpm ranges. Look for the report in about five years...

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post #127 of 179 Old 28th February 2016, 01:24 AM
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. All in all a 5-9 VDC supply seems to be the safe way to go.
I would clarify that to say a current-limited 5-9 VDC supply. That's the great thing about the 9V (smoke detector-type) battery - it self-limits to a maximum of ~4A when dead-shorted.

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post #128 of 179 Old 28th February 2016, 01:32 AM
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post #129 of 179 Old 28th February 2016, 02:05 AM
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You have said that before, but how? All that is in there is 6 quad A batteries?
You mean how is it so high or how is it so low?

If you have 10A scale on your DMM, try it.
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post #130 of 179 Old 28th February 2016, 02:16 AM
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No, I mean what is limiting it? Is it just what those batteries can output? I have taken tons apart because quad A are the same length as triple A. I never noticed anything but was not looking, or maybe I did notice and ignored what I saw.
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