Originally Posted by Seadoc777
I have a Perkins
4108 diesel engine. The starter spins up but fails to engage and spin the engine. Does the starter need replacement or just the solenoid/Bendix?
It is rather unlikely the whole starter motor
will need to be replaced, especially as the starter spins up as you say. They are fairly easily serviced and you should perhaps try to do this yourself. Doing so will allow you to become very familiar with your own starter motor
and as they are often very similar, with starter motors in general. If you have a solenoid motor it does sound like the solenoid is either sticking or not engaging at all. It may be it just needs to be cleaned. If it is an inertial bendix it is likely that it just needs to be cleaned. I attach photos of an inertial bendix starter motor repair which was actually due to a burned out actuator wire. I had to do this repair in the Tuamotu islands far from any technical assistance and so found, as usual, that my greatest tool was a digital camera
, which is like a breadcrumb trail: photograph each step of the process and it will be easy to follow the path back.
Solenoids can sometimes stick due to corrosion
or dirt so may not in fact need replacement.
Most Perkins Bendixes I have come across loosen in a clockwise direction by the way. And if you decide to do it yourselve and service
the motor while you are at it, just remember that when you remove the spline and rotor you will likely have a shower
of little ballbearings which are held in place by the spline. Replacing these can be tricky but is achieved by sticking each one back in place with a dab of grease before replacing the spline.