Valtra
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 posted on 18/1/08 at 09:19 PM |
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starter motor won't stop !!!!
I have a problem baffling me at the moment my long winded Formula 27 project (15 years and counting!) is now nearing completion, my engine has been
stood idle since rebuild some 10 years ago , when I hooked up the starter it didn't work even though power was reaching it , so I whipped off
the solenoid and it was seized up . i cleaned it up and freed it of and it seems to work fine now and throws the starter into mesh and the starter
cranks over fine ....but the only way to stop it then is to cut the battery switch .
I'm no expert on starters so any advice would be apreciated the system is a bit of a mongrel in that I have a early 80's Fiat TC 1600 with
a bosch starter and an early 80's Escort mk2 wiring loom using a Sierra column and ignition switch (bypassed with a starter button ) when the
power is cut by releasing the button the solenoid wire still carries a small voltage for some reason, is this stopping the solenoid from springing
back and cutting the power ? if so how do I stop it the power seems to leak through the closed push button switch . Incidentaly I've tried
reverting to the key start and it still suffers the same run on .
Is the starter at fault ? or am I missing something fundamental
thanks
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omega 24 v6
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| posted on 18/1/08 at 09:35 PM |
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Firstly are you sure it's the start button that is giving the power??? I'd put a temporary switch on that you know is good and try it with
that first. Also could the plunger on the solenoid main terminals be coming back and sticking?
Try that first and see.
Edited to say that a line drawing in paint or similar of how you've wired it may let us see a bit more. Especially if the alternator is on the
same circuit i.e. the exciter/warning light lead could be feeding the solenoid.
[Edited on 18/1/08 by omega 24 v6]
If it looks wrong it probably is wrong.
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Valtra
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| posted on 18/1/08 at 09:53 PM |
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Ah yes I've not connected the instrument pannel (Fiat Mirrafiori ) so the ignition light is not in use that could possibly be where the current
is coming from but I have tried reverting to the standard ignition switch and the problem still occurs so the button can be ruled out I think.
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rusty nuts
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| posted on 18/1/08 at 10:08 PM |
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Try disconnecting the starter button to solonoid wire from the starter when the starter is cranking. If the starter still cranks then the fault is in
the starter , if it stops then the wiring/switch is at fault
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Valtra
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| posted on 18/1/08 at 10:20 PM |
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looks like the starter then as I've tried that in all sorts of ways and the only way is to turn off the battery switch .
Come to think of it should the yolk be spring loaded ? as it just sems to flap about for nothing or should there be a return spring on the pinion that
would pull/push the yolk back ?
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omega 24 v6
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| posted on 18/1/08 at 10:37 PM |
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IIRC it should be spring loaded i think.
If it looks wrong it probably is wrong.
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snapper
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| posted on 19/1/08 at 01:40 AM |
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start from the the solenoid and use a wire direct to the battery (after removing the wire in the loom) and hold it on the + terminal, solenoid should
engage and turn engine over, remove bodge wire from battery, if starter motor stops then it is a wiring fault, if starter motor carries on turning
then i suspect it is a solenoid fault feeding power off the major starter motor feed.
With possible wiring faults, start from the mechanical item and work out, most of the time.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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Valtra
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| posted on 19/1/08 at 11:04 AM |
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Thanks that too sounds very feasable . as like I say this is an early 80's motor thats done nothing since rebuild some 10 years ago ...
One bonus of the running on is that it alowed me an easy way of lamp timing the ignition ....
after 10 years and a modified second hand Lumenition competition system cobbled up I have sparks ....result !!!!
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Valtra
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| posted on 19/1/08 at 09:21 PM |
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Thanks everybody
I took the starter apart and it turns out the yolk had splayed out a tad and slipped off the pinion thrust mechanism, the solenoid was pushing it in
gear but not pulling it back hence why it was wagling around . tightened it up with a mole grip and it works fine now .
Cheers
Ian
43 today (great birthday present ) fog light works, reversing light works, you can't begin to understand how that feels after 15 years !!
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