Subject: Water Pump pulley Failures
Model Year: 1966 Corvette with 350 H.P., 327 cu. in. Engine
Date: July 26, 1966
Bulletin Number: DR #66-40
Section: VI
TO: ALL CHEVROLET DEALERS
Some 1966 350 H.P., cu. in. Corvettes equipped with two or three groove water pump pulleys may experience pulley failures due to insufficient support of the pulley in the hub area.
Effective with the start of 1967 production, a pulley reinforcement will be installed on this engine as standard equipment.
For service, whenever the above condition is encountered, or work is being performed involving the fan or pulley, add pulley reinforcement #3720616 between the water pump pulley and the fan.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
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Article ID: 84
Created: July 4, 2014
Last Updated: July 4, 2014
Author: Rob Loszewski
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article.php?id=84