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Problem with starter motor

2K views 10 replies 3 participants last post by  brit01 
#1 ·
I have an annoying issue with my starter motor.

When I turn the ignition I get a slight kick back or hesitation for the starter motor to start.

Grounds checked and replaced. A new ground cable is fitted directly to the battery.

Advanced checked - first thought was kick back from too advance but that's not the case.

Could it be the solenoid?
I had changed the solenoid but it was one from Brazil which are not very good quality.
The old bosch original is still good I think.

Or if it's not the solenoid I hope it's not a slightly burnt out motor.

Any ideas chaps?
 
#4 ·
This has been ruled out as I tried retarding it a lot and still the same.

Wear out of the solenoid's hi-amp contacts is often responsible for this kind of behavior.

The original Bosch solenoids are usually giving up after 15-17 years of service.
My old bosch from Germany was ok.
It has been playing up since I changed it to a new Bosch but made in Brazil which is like the Chinese of S.America, same name but not the same quality.

Maybe the hi-amp contacts are bad already.

I swapped it because I made a big boobooo when rebuilding my engine.
I missed the earthing cable when re-installing the starter motor and suspected the solenoid was stuffed. so I changed it for the new Brazilian one only to find the missing earth cable!!

Maybe revert back to the old German Bosch solenoid.
:thumbs:

What about the positive supply? Where and how is that routed to the motor? (does it come from the alternator?)
 
#7 ·
Yes, the solenoid "hi-amp" (marked as "30") input terminal is connected directly to the battery + terminal.

When replacing this cable, the core cross section (excluding the insulation) parameter is very important.
The cross section should be >= 10 sq mm, when the core is made of copper. Thinner cables could easily catch on
fire during cranking.
 
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