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1953 Corvette: Service Bulletin: New Spoke Flywheel and Converter Attachment to Flywheel - Late Powerglide Models

Source: Chevrolet Technical Service Bulletin
Number:  DR - 157
Section:  VI
Date: October 7, 1953
Subject:  New Spoke Flywheel and Converter Attachment to Flywheel - Late 1953 Powerglide Models

TO: ALL CHEVROLET DEALERS

A new Spoke Flywheel is now being used on Powerglide Engines to reduce engine noise and vibration. The flywheel to Powerglide Converter attachment has been redesigned using three 3/8" bolts in place of six 5/16" bolts.

Changes entered the transmission and engine plants approximately 9-15-53 and will be assembled in cars 100% about 10-1-53.

SERVICE

When a new converter with three 3/8" attaching bolts is being assembled to an early type flywheel, alternate holes in the flywheel should be enlarged.

When a new flywheel is assembled to an old converter six 5/16" bolts should be used.

Service flywheels will have three 5/16" and three 3/8" holes in alternate locations.

PARTS

Description1st Type2nd TypeQuantity
Flywheel 3835936 3708436 1
Primary Pump with Housing & Cover 3835936 3708436 1
Anchor Nut 5/16 - 24 3702309 - 6
Anchor Nut 3/8 - 24 - 3703277 3
Hex Bolt W/Lockwasher 5/16 - 24 3702682 - 6
Hex Bolt W/Lockwasher 3/8 - 24 - 3708352 3
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