hard starting diesel when hot

Submitted: Monday, Jun 28, 2004 at 13:09
ThreadID: 14202 Views:2860 Replies:9 FollowUps:1
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G'day all,
has anyone had problems starting a diesel when it is at running temp. The symptoms are that of a flat battery (slow cranking). The vehicle in question has dual batteries -both have been checked and found to be ok.
When it is cold, it starts first kick even in snow /ice. It starts when jumped off a booster pak or 4wd but not when jumped off a car. This to me is a little strange when both batts are good. It is a 1HZ motor.
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Reply By: Voxson (Adelaide) - Monday, Jun 28, 2004 at 13:48

Monday, Jun 28, 2004 at 13:48
Sounds like a bad connection to me.... Plain and simple....

Not so simple,,, starter motor problem but you said it is fine when being jumped from another source......
AnswerID: 65504

Reply By: Member - Jeff M (WA) - Monday, Jun 28, 2004 at 13:59

Monday, Jun 28, 2004 at 13:59
Sounds like a bad starter motor, jumping just gives you a little extra power to get past the resistance in the motor possibly...
AnswerID: 65506

Follow Up By: tour boy - Monday, Jun 28, 2004 at 14:07

Monday, Jun 28, 2004 at 14:07
Thanks,
It's a friend of mines truck I havn't looked at it yet but I'm going to pull every lead and earth strap off and clean it this arvo. It may have a frayed earth strap somewhere causing more resistance when hot. I feel that if it was the starter itself, it would play up when cold occasionally.
Any sparkys out there??
Cheers
0
FollowupID: 326449

Reply By: Member - Captain (WA) - Monday, Jun 28, 2004 at 14:35

Monday, Jun 28, 2004 at 14:35
Hi Tour boy,

I had a similair problem on my old 1HZ, it turned out to be a bad earth connection from the battery isolator, only happened when warm. I found this by using a jumper lead from the battery direct to earth, bypassing the isolator (negative earth isolator) and it started fine. It may help your troubleshooting to use jumper leads as piggyback cables to isolate which lead is giving trouble.

Best of luck

Captain
Its not what you drive, but how you drive it!
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AnswerID: 65510

Reply By: Martyn (WA) - Monday, Jun 28, 2004 at 14:36

Monday, Jun 28, 2004 at 14:36
Tour Boy,
Don't forget the lead between the piggy back solenoid and the main starter motor I had a bad connection there once caused me a bit of grief and took a while to find.
Keep the shiny side up

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AnswerID: 65511

Reply By: tour boy - Monday, Jun 28, 2004 at 14:53

Monday, Jun 28, 2004 at 14:53
Thankyou all I hope thaks all it is as she has been out of work for 8 mths and hasn't got funds for a major fix.
AnswerID: 65513

Reply By: Alex Callaghan - Monday, Jun 28, 2004 at 15:24

Monday, Jun 28, 2004 at 15:24
G'day,
Have you got a wire brush onto your battery terminals? If not give the terminals a good once over with a wire brush.
AnswerID: 65520

Reply By: Nino & Kerry (VIC) - Monday, Jun 28, 2004 at 20:01

Monday, Jun 28, 2004 at 20:01
G'day Tour boy,
Assuming that all the terminals are making a good connection I would fit a relay to the starter solinoid. Just use a normal 5 pin relay to ensure a constant 12v feed to the solinoid.It sounds as if the heat is causing a high resistance in the starter motor/solinoid.
If that doesn't fix it, I'll buy you a pint!!!!!
Good luck Nino.
AnswerID: 65569

Reply By: B3 - Tuesday, Jun 29, 2004 at 17:48

Tuesday, Jun 29, 2004 at 17:48
I had the same problem with my Hilux. Overhauled the starter motor and found the bearing was completely rooted replaced it at a cost of $5 from CBC and never a problem since
AnswerID: 65681

Reply By: Eric Experience. - Tuesday, Jun 29, 2004 at 22:43

Tuesday, Jun 29, 2004 at 22:43
Tour boy.
Sounds like the starter motor is poling, that is the amature[the rotor] is contacting the field [the statoinary winding] this happens when the bushes are a bit warn and the heat makes the armature expand a little. It is easy to fix all that is reqiured is a bronze bush. Eric.
AnswerID: 65738

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