The_German

My 56 starts with a lot of energy and revings when the engine is cold. Battery is a full as it can get. Once the engine is hot, the starter motor is extremely slow and it sounds as if it revs like once before the battery dies.
Any idea what the reason for that could be?
Again, the battery is new, no deficiencies on that side....

sysmg

Could be weak ground, or likely starter gets hot and has trouble. Might need a starter rebuild.

stellar

It sounds like the fields in the starter are grounded, or possibly the armature. Take a look at the starter as soon as you can. To drain a battery in one crank is a very heavy draw.

oldcutlass

What is your battery voltage?

The_German

The battery does not get drained, the battery is fine and still the starter motor revs slowly.. The engine starts then, but it is always like praying: "Pls, pls start... "

leftlaneonly

Wait till it cools



How close the the exhaust manifold, is there a heat shield missing, Faulty starter solenoid maybe

stellar

I would definatly check battery cables and cable connections and then pull the starter. I would not continue attemptin to start with this condition

coldwar

Also, lead timing may check too far advanced. This especially if the engine 'grunts' when cranking hot. Try holding it to 8° lead at timing mark on crankshaft until you get it figured out.

Sugar Bear

Measure the voltage at the battery and at the starter when this occurs.

ignachuck

X2 on this ^^^^^^ suggestion.

The_German

Too American for an old German, I am afraid... :-)))))

Thanks guys for your help, will go step by step.