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Thursday, January 20, 2011

How to use a Tach Dwell Meter

A dwell meter is used to check the dwell angle on vehicles with a points-type ignition. Dwell angle is the length of time (measured by the degree of rotation of the distributor cam) the contact points open on a points-type ignition system. Points-type ignition systems were commonly used on vehicles manufactured before the mid-1970s. The dwell angle must be periodically checked on these vehicles to ensure proper operation of the ignition system. In addition, the dwell angle on these vehicles must be checked before setting the ignition timing.

Automotive car Top Overhaul

Top Overhaul
1. Top Overhaul
a. General
(1) By top overhaul is meant the lapping of valves and the making of necessary repairs of those parts on the crankcase which are accessible without disassembling the crankcase. It includes the removal of cylinders, pistons, piston rings and valve gear for replacement or service.
(2) The need for a top overhaul is usually indicated by not being able to get the required engine speed with full open throttle while the airplane is on the ground. It is also indicated by excessive oil consumption.

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