I'm a yachtie but a good friend of mine has a Four Winns 318 Cruiser fitted with twin Volvo
5.7 Gi/DP stern drives. As he is elderly and not able to do repairs
himself I'm wanting to help him with a starter motor
problem on one of the engines.
When the ignition key is turned the starter motor
is heard to spin but the pinion gear
does not engage with the flywheel ring gear
to crank the engine
. I've tried the old trick of "tapping" the starter motor with a hammer to see if any dirt or stickiness can be overcome, but to no avail.
So the forward plan is to remove the starter motor (I didn't have the correct tools with me at the time) to investigate. My web research
suggests there are two types of starter solenoids : (a) simply connects the starter to the battery
and then centrifugal force forces the pinion into the ring gear, or (b) an electromagnetic version whereby the pinion is forced out via magnetic force. Frankly, I've never heard of (b), but then life is full of surprises.
If its (a) then the problem could be dirt, rust or missing teeth on the flywheel (unlikely). If its (b) the problem could be insufficient voltage (unlikely), a bad electrical
connection or ground, or a faulty solenoid.
Am I missing anything?
Also, the starter motor is very difficult to access. I can see one horizontal bolt which goes through the flywheel casing roughly on the same axis as the starter motor axle/shaft, and I can "feel" one vertical bolt underneath seemingly clamping the starter motor upwards. Subsequent web research
suggests there are two such vertical bolts, so I will check again on my next visit.
Can anyone shed any light on the mounting bolts - are there two vertical bolts? and is the abovementioned horizontal bolt irrelevant to removal
Thanks for all help.