Here's where your new clamp-on ammeter pays for itself. First measure voltage between the starter terminals(not the wires) when it clunks. Near battery
voltage means the solenoid is not pulling in (and a click rather than a clunk). Less than 10v means you may have connection problems or a partial hydrolock. Also clamp the ammeter part around one of the thick wires and measure current
during the clunk. It should be between 200 and 400 amps. If its over 400 amps, try turning the engine
over by hand to detect a hydrolock.
in the oil
is not a good sign, especially after the engine
has overheated. Pouring cold water
into an overheated engine is a very expensive mistake--it can lead to cracked blocks/heads and blown head
gaskets. One of the symptoms of these is water in the oil
. Another symptom can be water in a cylinder. Another symptom is if you are losing water with no external leak. If fingers point away from the starter and/or you change the oil and find more water it may be time to call in some help.