> How can I check out a vaccum wiper motor while out of the vehicle? If it
> working properly, will it be sufficient or should I replace it with
> while it is out? The specific model is a 49 3/4 ton.
Hook up vac line , turn on and if you can hold on to motor and stall it it is
weak. It should jerk out of your hand. If it doesn't, run some air tool oil
thru it then heavier oil to reseal piston. You might rig up a bottle to
catch oil before it goes into manifold, although I haven't ruined any engines
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