DB885 Thermostart

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PoppyShan885
Posts: 67
Joined: Tue Oct 02, 2018 12:48 pm
Location: Southern Indiana, USA

DB885 Thermostart

Post by PoppyShan885 » Sun Mar 03, 2019 11:15 am

Yesterday, while tinkering with the tractor, the fuel switch cable broke and became stuck in the "on" position. I had to climb off the tractor, and inadvertently left the key on. After a couple minutes, I noticed smoke coming from the Thermo plug, meaning it was still on. Is this normal? In my mind it should only work in the "hold" position right before starter engagement, not in the "run" position. Am I thinking correctly?

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db2d
Posts: 2098
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: DB885 Thermostart

Post by db2d » Sun Mar 03, 2019 12:16 pm

Yes, you are correct. The Thermostart must not work until the key is held in the ‘heat’ position.

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PoppyShan885
Posts: 67
Joined: Tue Oct 02, 2018 12:48 pm
Location: Southern Indiana, USA

Re: DB885 Thermostart

Post by PoppyShan885 » Sun Mar 03, 2019 6:55 pm

So this leads me to my next question, how do I remedy it? What's causing it to remain "on"? It's it a faulty switch? A faulty Thermostart? How do I go about finding out?

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db2d
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Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: DB885 Thermostart

Post by db2d » Sun Mar 03, 2019 7:07 pm

The problem is either a faulty switch or the wiring connection locations. It is not the Thermostart.

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PoppyShan885
Posts: 67
Joined: Tue Oct 02, 2018 12:48 pm
Location: Southern Indiana, USA

Re: DB885 Thermostart

Post by PoppyShan885 » Sun Mar 03, 2019 7:28 pm

"Wiring connection locations", please explain. The connections haven't been changed from the factory.

Would this fault also cause fuel to be introduced continually into the intake manifold?

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db2d
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Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: DB885 Thermostart

Post by db2d » Sun Mar 03, 2019 7:51 pm

The switch is probably faulty. If the feed cable to the Thermostart is ‘live’ the element will become heated and the fuel valve will open allowing fuel through onto the element.
I recommend removing the cable from the Thermostart and insulating the end to avoid an electrical short circuit.
The Thermostart maybe damaged if it has been heated for an excessively long time.

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cobbadog
Posts: 613
Joined: Tue Oct 11, 2011 6:18 am
Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: DB885 Thermostart

Post by cobbadog » Mon Mar 04, 2019 3:26 am

If it is not the faulty switch then there is a short on the system somewhere. Wires can rub against each other and become live when not normally live. So check your ignition switch first and if it passes then you have to follow the wires through the harness to find a short.

mikeadams1985
Posts: 55
Joined: Thu Mar 01, 2018 7:59 pm
Location: Liverpool

Re: DB885 Thermostart

Post by mikeadams1985 » Sun Mar 10, 2019 1:04 pm

Id say faulty switch,
if the thermo start is wired in from the 3rd key position, then it can only be getting live when in that position. So must be faulty.
take the dash of and take a look at the back of the switch and trace the wire from the thermostart to see where it goes on the switch.

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PoppyShan885
Posts: 67
Joined: Tue Oct 02, 2018 12:48 pm
Location: Southern Indiana, USA

Re: DB885 Thermostart

Post by PoppyShan885 » Mon Apr 08, 2019 4:49 pm

Appears this was the cause of my "Engine Clatter" and "Starting Difficulties" threads. Thank for all of your help!

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