Yanmar 6lya-stp 370hp 6cyc

[diego garcia]

Hey everyone

I'm new to this sailnet community not sure I'm on the right page but...

I have an issue with my YANMAR starter motor or starting system.

For the passed week I have had intermittent starts, I can the actually starter motor (whizz) rotate but it doesn't turn the fly wheel. It used to kick in and start the engine eventually but now its not playing at all.

I've checked I'm getting 12+volts at the starter solenoid and checked the voltage drop on starting which went down to 9.5+volts, I presume this is correct.

I've checked the starter rely (back from the starter solenoid) and checked the battery isolating switches.

Using a insulated screw driver I created a short across the starter motor terminals but still had the same symptoms as before.
My next move is to change the starter motor???

[tommays]

Dropping to 9.5 volts would point out a problem

Is this at the battery OR the starter

If it is at the battery it could be a tired battery

If the battery stays at say 10.8 and the at the starter its droping to the 9.5 i would look at the cable and connection quality

[HDChopper]

sounds like the bindex isnt working correctly if as tommays says the batt holds up 10.8 or better...

bendix's are known for this issue,

[jrd22]

Probably Bendix drive on starter like Chopper said.

[Omatako]

Yep, what the others said, the bendix is not kicking into the ring gear.

Take the starter off and see if it just needs freeing up and lubricating, you may get lucky - they do get sticky with limited use.

[tommays]

From my POV if the starter is spinning BUT not turning over the motor and dropping to 9.5 volts its NOT getting the correct current

[diego garcia]

Cheers for all the help guys.

Just removed the starter motor... bendix and cog were covered in thick rust!!! it didn't even turn when I put a battery on it. Engine is only 80hrs old!