H Starter Question

good luck

J inPa

Rock

1 – Is the ignition timing set to spec? If timing is early (BTDC) it can a create a lot more work for the starter as it must crank against firing pressure near the top of each piston stroke. Can easily be tested by cranking with the ignition switch off. If the engine cranks faster with the ignition off, retard the timing.

2 – The starter may have become heat sensitive. This seems unlikely however as the starter lives out in the relatively cool space behind the engine. (This was more of a problem on some 8 cylinder engines where the starter is tucked between the engine block and the hot exhaust manifold...) Test by taking battery voltage readings when cranking both cold and hot. If it’s a temperature-related starter resistance problem, battery voltage will be HIGHER (starter draws less current) when the starter is hot. If you find that’s the problem best take the starter to a starter shop for a going over.

I don’t know offhand what the current draw is for a 6 volt starter on an H – I’d guess 300 amps or so. Battery voltage however should not drop below about 4 volts when cranking.

Good luck!