Will a diesel run with a flat battery

Submitted: Monday, Jun 02, 2008 at 19:48
ThreadID: 58301 Views:7412 Replies:7 FollowUps:13
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I have a friend who is away at the moment and has a 100 seies turbo diesel that has both batterys failing (about 4 years old) and he has been told that if the batterys go flat or die while the car is running that the motor will stop.

Any thoughts on that.

I was under the impression that as a diesel uses compression to run as opposed to ignition, then it will continue to run without a battery.

Obviously a battery is required to start it (probably via jumper leads) but will it continue to run without a fully chatged functional battery.

Cheers,

Cruiser
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Reply By: autosparky - Monday, Jun 02, 2008 at 19:57

Monday, Jun 02, 2008 at 19:57
it may for a little while , 100 series t/d is common rail and is computer driven. so as long as the battery maintains 10.5 to 12v , should be ok
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Follow Up By: Member - Graham H (QLD) - Monday, Jun 02, 2008 at 21:44

Monday, Jun 02, 2008 at 21:44
Sorry but I thought that the 100 T/d are direct injection motors.
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Reply By: Member - 120scruiser (NSW) - Monday, Jun 02, 2008 at 19:58

Monday, Jun 02, 2008 at 19:58
It should keep going as the alternator provides the power.
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Follow Up By: Member - JohnR (Vic)&Kath - Monday, Jun 02, 2008 at 23:16

Monday, Jun 02, 2008 at 23:16
and there is sufficient battery power to excite the alternator. I do know that some alternators are self exciting but I don't think car ones are.
Cheers,
Who?
John

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Reply By: Member - DOZER- Monday, Jun 02, 2008 at 19:59

Monday, Jun 02, 2008 at 19:59
Mate, as long as the alt is charging, the motor will run...if his accessories are such that they use the 120 amps the alt can supply, he has a very large sound system in there and should turn it down :)
Once the motor stopps, thats a different story...it will never go again if it a factory turbo unit with EFI computer.
Andrew
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

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Classifieds: Bt50/Ranger Speedy grande2 18x8 alloys (x4), Landcruiser 200 series/100 series 4 alloy rims with tyres and nuts GC

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Follow Up By: Member - Doug T (FNQ) - Monday, Jun 02, 2008 at 20:27

Monday, Jun 02, 2008 at 20:27
DOZER
Oh how wonderful it is to own and drive a non computerised , standard basic true 4x4,with $18 headlights, no central locking, no electric windows, no turbo, no air bags,

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still going strong with 836,179 K's

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Follow Up By: Member - Oldplodder (QLD) - Monday, Jun 02, 2008 at 20:47

Monday, Jun 02, 2008 at 20:47
Doug,

Did you forget the fuel solenoid valve?
OK while the alternator provides power, no good otherwise :O0

I do however liking my old diesel too with mechanical injection.
Onlyned about 6 to 8 volts and a hill to clutch start it. O0
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Follow Up By: Member - Doug T (FNQ) - Monday, Jun 02, 2008 at 20:55

Monday, Jun 02, 2008 at 20:55
Oldplodder
Yeh once going you can disconnect the battery, the Fusable link can be a minor problem sometimes, I had a problem once with that over heating and getting very hot due to an alternator problem , just connect it to start and then disconnect it again.

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Follow Up By: Member - Crazy Dog (QLD) - Monday, Jun 02, 2008 at 21:59

Monday, Jun 02, 2008 at 21:59
Not true about the air bag - he drives it...LOLOL

By the way Doug - how is the "New Program" that I sent you as payback for the fake formatter ya sent me eh?


Grrr!!!
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Follow Up By: autosparky - Monday, Jun 02, 2008 at 22:53

Monday, Jun 02, 2008 at 22:53
100 series after 2002 are common rail in t/d
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Follow Up By: Member - Davoe (Yalgoo) - Tuesday, Jun 03, 2008 at 00:17

Tuesday, Jun 03, 2008 at 00:17
You sure about that? I dont think and cruiser came out with a common rail injected 6 cyl
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Follow Up By: Member - Brett C (WA) - Tuesday, Jun 03, 2008 at 00:57

Tuesday, Jun 03, 2008 at 00:57
Just spoke to a friend who is a Service Manager for a Toyota Dealership in the Southern Suburbs of Perth. He said the hungy never had common rail injection.
Brett....
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Follow Up By: Grungle - Tuesday, Jun 03, 2008 at 07:32

Tuesday, Jun 03, 2008 at 07:32
Not common rail but direct injection so still computer controlled.

Regards
David
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Follow Up By: Member - Oldplodder (QLD) - Tuesday, Jun 03, 2008 at 08:16

Tuesday, Jun 03, 2008 at 08:16
Yeah,

Same going from the 2.8 diesel I have to the 3.2 diesel in the NM/NP (2000 - 2007).
I am purely mechanical., with a 'bosch' style rotary pump and direct injection, while the 3.2 has the same system but with computer controlled rotary pump. Still pump to mechanical injector injection, just better pump control, and no common rail. Electronic throttle, and a few sensors on the 3.2 that need the right voltage.
New NS (2008) pajero has full level 2 common rail with solenoid controlled injectors.
Those 2008 emission controls brought in by the government changed a few things in the diesel world, like the death of the 4.2 in the nissan, and the birth of the D4D in the toyotas. All the diesel utes have now gone full electronic common rail. They get good economy though.
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Reply By: TD100 - Monday, Jun 02, 2008 at 20:02

Monday, Jun 02, 2008 at 20:02
Cruiser,

a 100 series does need some power to run the electric solenoids that supply fuel to the injectors, as for it running with failing batteries-- it should providing they dont have internal shorts pulling alternator down, it may run once started and batteries disconnected-unsure as i havee not tried this on mine or know anyone that has. usually any thing that has electronics controlling engine and trans mixed with failing batteries usually spells problems. cheers Paul
AnswerID: 307372

Follow Up By: Peter 2 - Monday, Jun 02, 2008 at 20:57

Monday, Jun 02, 2008 at 20:57
Disconnecting the batteries while the engine is running will totally trash the alternator and the resultant voltage spike will probably stuff anything electronic running at the time.
You MUST have a battery connected to any vehicle with an alternator whilst it is running. Doesn't matter whether the battery is cactus there must still be one in the system.
You might get away with it on an older vehicle with an external regualtor and no electronics but most later model ones will come to grief.
Peter
1996 Oka Motorhome

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Follow Up By: Member - Oldplodder (QLD) - Tuesday, Jun 03, 2008 at 08:18

Tuesday, Jun 03, 2008 at 08:18
Thanks Peter2, good point to remember.
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Reply By: Richard W (NSW) - Tuesday, Jun 03, 2008 at 07:26

Tuesday, Jun 03, 2008 at 07:26
Cruiser,
I ran my TD100 with failing batteries from Karumba to Mr Isa where I had the 2.5y old originals replaced with N70Z's.
This vehicle has two starters in parallel and the main battery only had 8V.
AnswerID: 307449

Reply By: StormyKnight - Tuesday, Jun 03, 2008 at 16:57

Tuesday, Jun 03, 2008 at 16:57
My old Hj60 2H Diesel needed electricity to start & to stop, but not to actually run....

My AUTO Prado Diesel however does need electricity to run....

After a recent alternator failure, she ran for about 140km before I finally got home. Albeit the following things had failed in this order...
..UHF
..AM/FM Radio back lights...radio itself was already off
..Using the brakes made the dash lights dim...did I mention this was at night? I used the tail lights of my mate in front to guide me & I only turned my lights on when oncoming traffic was about.
..tacho
..Auto gearbox stuck in 1st - probablt related to tacho not working
..Finally...odd changes in injector noise when appling the brakes...the brake lights take a lot of power & as such were now effecting the injectors...

Also of note 2 petrol Prados who also had alternator failures from the same mud puddle made it only 8km before needing a tow!

Cheers
AnswerID: 307545

Reply By: Member - Davoe (Yalgoo) - Wednesday, Jun 04, 2008 at 01:06

Wednesday, Jun 04, 2008 at 01:06
When travelling remote I would pull the fuel control rod off of my 2H deisal and turn it off to stop electrical interferance while I was listening to the cricket while driving
AnswerID: 307651

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