Quote:
Originally posted by stevebfl
[Many cars have pumps that are a real liability and real diagnostic techniques have been adapted to quantitatively judge these risky pumps.
The pattern is taken by placing an inductive ammeter on a power wire. It represents curent over time. The humps indicate peak current at each commutator segment. Characteristic shapes of particular "humps" can identify a complete revolution and thus determine rpms. Aftermarket sources have compiled tables of rpm values for these perishable pumps.
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Steve,
can this test be done with normal amper metre or rather an oscilloscope
what is the time scale of your graph?
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Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km
Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km
Son's one: GLK class, 220CDI, 2009, W204
Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).
Sold: E-class, 320CDI, W210, 2000, 225 000km
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