Engine Assembly

Engine Mountings

Cushion balanced engine mountings, used in the passenger car models, involve an entirely new principle of engine mounting. It completely insulates the occupants of the car from engine vibrations.

Engine Tune-Up
One of the most important duties that service men have to perform is the tuning of Chevrolet engines. This operation more than any other deter-mines whether or not the owner will get the maxi-mum amount of performance with the greatest amount of economy from his car or truck.
Only by performing these operations and adhering to limits, clearances and specifications are you able to get the performance and economy that has been built into the Chevrolet six-cylinder engine.
Engine Tune-Up Instructions
Before tuning a Chevrolet engine, the compression should be checked to see whether it is even in
Fig. 84— Compression Gauge
all cylinders because an engine with uneven compression cannot be successfully tuned. Fig. 84.
If the engine shows uneven compression, check to be sure that all valves have the proper clearance. If a valve is found with improper clearance, set it at the recommended clearance and re-check the compression. If the engine still has uneven compression, it would mean that it either has burned, or sticky valves, leaky cylinder head gasket or leaking rings, or worn cylinders, in which case the trouble would have to be corrected before the engine can be successfully tuned.
Spark Plugs
Remove the spark plugs and check to see that they are all the recommended plug for the engine.
Type K 11. This is important because of the various heat characteristics of the different plugs.
Clean the plugs or, if necessary, replace them and set the gaps to .032" to .035", using a round
Fig. 85— Spark Plug Gap
feeler gauge for accuracy. All spark plug gaps must be the same. Fig. 85.
Distributor
Remove the distributor cap and rotor and check the breaker points, clean, or, if necessary, replace.
Hand crank the engine until the breaker arm cam follower is on the peak of the cam. Adjust the breaker points to .018", using a feeler gauge for accuracy. See Fig. 86.
Check the automatic advance mechanism by turning the distributor shaft in a clockwise direction to see that it is free and that the springs of the automatic advance mechanism return the cam and shaft to its retarded position when released.
Fig. 86— Breaker Point Gap
Check to see that the vacuum spark control operates freely and is in its full retarded position.
Set the octane selector to "0" on the scale. See Fig. 87.
Check distributor cap and rotor for carbon streaks and cracks and check the spark plug and

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