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Old 08-12-2017, 01:46   #31
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Re: yanmar 4jh4e starting problem

Today I check all connections one more time and see that negative cable which goes from engine ground to battery terminal(-),on its half away is cutted and there is conected other negative cable which goes to house battery,problem is that the cable is pressured and restrict current to flow,then i disconnected that i try to put cable on its narmal look.Engine was started and it starts well,and there isnt be sound of starter motor like on earlier starting,also voltage drop test was done.On positve side(battery+ and starter motor+),and on negative side also(battery- and starter motor-(ground).Results are:voltage drop on positive side vas 1V,and on negative side 0.2V.
In my earlier videos of measuring voltage on battery-I connected positive lead to battery+ terminal,and negative lead to battery - terminal,measuring voltage on starter motor positive lead was on solenoid+ and starter motor ground.
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Old 08-12-2017, 01:50   #32
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Re: yanmar 4jh4e starting problem

Sounds like you have fixed your problem - well done
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Old 08-12-2017, 20:05   #33
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Re: yanmar 4jh4e starting problem

Good job! Glad it's working. I would still try to eliminate the voltage drop on the positive side. I suspect the positive cable.
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Old 20-12-2017, 03:03   #34
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Re: yanmar 4jh4e starting problem

Hello one more time,I was thought that problem is resolved,but it is still there,after 10 days of sitting i have same rough starting,i suspect positive cable where i have 1,2 voltage drop.Connections on postive side:terminals on battery,starter and main switch are tightened and clean,I am confused that i have voltage drop.
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Old 20-12-2017, 06:59   #35
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Re: yanmar 4jh4e starting problem

Are you measuring voltage after the big starter solenoid mounted on the starter? Thatís usually a bolt that sticks out of the starter itself. Not where the battery cable attaches to the solenoid.
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Old 20-12-2017, 07:56   #36
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Re: yanmar 4jh4e starting problem

i measure from bolt on solenoid where the big cable from battery is attached
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Old 20-12-2017, 09:36   #37
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Re: yanmar 4jh4e starting problem

Try measuring on the bolt of the starter motor instead.
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Old 21-12-2017, 06:34   #38
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Re: yanmar 4jh4e starting problem

And did you check and clean the ground on the starter?? Mine looked fine, however when I removed it there was significant corrosion at the point where the terminal connects with the metal on the starter. Maybe also try measuring the resistance in the cables themselves as a bad cable could be to blame.

Good Luck!
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Old 21-12-2017, 08:27   #39
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Re: yanmar 4jh4e starting problem

Since the positive cable is suspect, try the suggestion of putting a jumper cable in parallel with it. If that solves the problem, replace the positive cable with a heavier one.
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Old 21-12-2017, 08:51   #40
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Re: yanmar 4jh4e starting problem

I can but wonder if it's an electrical problem at all. Cold diesels don't like to start, thus a glow plug on some. I may be the sound track but the valve rattle sounded loud?
JMHO and I'm often wrong.
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