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1998 300Tdi Disco starting issue

 
 
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crunchy
Off-Road Guru


Joined: 31 Jul 2003
Odometer: 1040
Location: Essex


1986 Land Rover 90nad

PostPosted: Thu Mar 16, 2017 4:41 pm    Post subject: 1998 300Tdi Disco starting issue Reply with quote

Hi guys. I've got a brand new battery and that's all fine, charging fine, alternator good, no battery drain, if left for a week battery show 12.6v. Exact same voltage at solenoid so presuming earths all good.

But at cold start it is sluggish to turn over (ie symptoms of a flat battery) and struggles but will start. Testing it after a few minutes running it spins seemingly faster and starts as it should.

I have a cut out switch to the fuel solenoid so can spin it over without it starting and confirm the sluggishness.

Cannot think of anything else but starter motor??

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Max.
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( Gray )
Articulating


Joined: 15 Apr 2012
Odometer: 597




PostPosted: Thu Mar 16, 2017 5:23 pm    Post subject: Reply with quote

Check the earth strap from the starter motor. A dodgy earth strap might allow the minimal current from the solenoid but not the large current needed by the starter motor.
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crunchy
Off-Road Guru


Joined: 31 Jul 2003
Odometer: 1040
Location: Essex


1986 Land Rover 90nad

PostPosted: Thu Mar 16, 2017 6:56 pm    Post subject: Reply with quote

Hi Gray,

Thanks very much for the fast reply. I did check across from the positive (solenoid) to the neg on the solenoid and both ends of the earth braid including the terminal on the starter and all good. This was while engine/ignition off etc not while cranking.

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Max.
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mike328
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Joined: 10 Dec 2014
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Location: Suffolk!



PostPosted: Thu Mar 16, 2017 8:24 pm    Post subject: Reply with quote

You're measuring voltage, not current (amps), my money is that Grey is right and if you measured the same points when cranking the voltage would drop.
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Snap On: Turning drawers into status symbols since 1920.
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crunchy
Off-Road Guru


Joined: 31 Jul 2003
Odometer: 1040
Location: Essex


1986 Land Rover 90nad

PostPosted: Fri Mar 17, 2017 9:32 am    Post subject: Reply with quote

OK, this morning (pretty cold) battery showing around 12.45 volts. Across positive of solenoid the same but when cranking (fuel stop solenoid activated) it goes down to 8v or so.
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Max.
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crunchy
Off-Road Guru


Joined: 31 Jul 2003
Odometer: 1040
Location: Essex


1986 Land Rover 90nad

PostPosted: Fri Mar 17, 2017 2:00 pm    Post subject: Reply with quote

To update - it did start OK - came back after 1/2 hr run and same result with voltage 12.5 down to 8 or so at cranking.

All battery terminals are good - only lead from the negative on this battery is one direct to the chassis.

And then there is the one on the other side from chassis to starter.

I guess next job is to remove both of these and clean the contacts?

And then a new starter?

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Max.
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( Gray )
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Joined: 15 Apr 2012
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PostPosted: Fri Mar 17, 2017 4:32 pm    Post subject: Reply with quote

After cleaning up the earth points, add an​ earth strap direct from the starter motor to the battery. Heavy duty welding cables are a popular choice for an extra earth strap.
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crunchy
Off-Road Guru


Joined: 31 Jul 2003
Odometer: 1040
Location: Essex


1986 Land Rover 90nad

PostPosted: Fri Mar 17, 2017 5:53 pm    Post subject: Reply with quote

Thanks Gray, I'll make one up - guessing length would need to be close to 1 metre. Would 25mm sq be OK?

Or maybe this:

http://www.ebay.co.uk/itm/35mm2-240amp-Battery-...sd%3D321919807069

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Max.
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( Gray )
Articulating


Joined: 15 Apr 2012
Odometer: 597




PostPosted: Sat Mar 18, 2017 8:12 am    Post subject: Reply with quote

I've read that in cold weather a 300tdi starter can draw 600amp current. A good starting point (pardon the pun) would be to look at the size of the current (sorry again) earth strap.
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tilly1
Winch Assistant


Joined: 21 May 2012
Odometer: 86
Location: bolton



PostPosted: Sat Mar 18, 2017 11:31 pm    Post subject: Reply with quote

maybe your starter motor is in need of a service is it turning over fast enough
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crunchy
Off-Road Guru


Joined: 31 Jul 2003
Odometer: 1040
Location: Essex


1986 Land Rover 90nad

PostPosted: Sun Mar 19, 2017 1:12 pm    Post subject: Reply with quote

Another update.

This morning battery was showing 12.95v

When cranking the starter:

Battery dropped to around 9v

Starter voltage dropped to around 7v.

I cleaned all earths through the system and put another charge in the battery.

Subsequently after charge and cleaning:

Battery showed 13.5v

Cranking - battery = 9.8v

Starter = 8.8v

So, the cleaning has helped a little but starter still sluggish.

I could try adding another earth lead but this will need to be around 6ft long to reach.

Or just get a new starter?!

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Max.
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tilly1
Winch Assistant


Joined: 21 May 2012
Odometer: 86
Location: bolton



PostPosted: Wed Mar 22, 2017 7:20 pm    Post subject: Reply with quote

just get your starter motor serviced prob dry inside or brushes worn
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