ROCHESTER CARBURETORS

Bulletin 9D-32  3-10-55

United Motors Service

division of GENERAL MOTORS CORPORATION

GENERAL OFFICES-DETROIT

ROCHESTER PRODUCTS

CARBURETOR BULLETIN

Bulletin        9 D-32
Date:          3-10-55
Page                     1
Supersedes 9 D-32 Dated 11-1-49
SERVICE
SUBJECT--LEAN SURGE CONDITION 1955 V-8 CHEVROLET CARBURETOR
A lean surge condition, at speeds ranging from 55-75 mph road load, has been reported on V-8 engines in the field with both Powerglide and three-speed trans­missions. This condition will only be found where the Powerglide V-8 engine is equipped with carburetor part No. 7005810 or where a three-speed transmission V-8 engine is equipped with carburetor part No. 7006825. The condition may be corrected by replacing the venturi cluster assembly and The main metering jets in the carburetors.
On Powerglide V-8 carburetors, venturi cluster part No. 7007989 replaces cluster assembly No. 7000287 and main metering jets (two) part No. 7002951 replace main jets part No. 7002952. On the three-speed transmission V-8 engine carburetor the venturi cluster assembly part No. 7007990 replaces cluster assembly No. 7006844 and main metering jets (two) part No. 7002952 replace main jets part No. 7002953.
Carburetor, part No. 7008004. used on the Powerglide V-8 engine, and carbu­retor part No. 7008005, used on the three-speed V-8 engine, have the new venturi cluster assemblies and main metering jets and are not subject to- the lean surge condition.
Policy: This modification is to be handled on a maintenance basis.
(0467 PD 3-55)                                -0-                            (Printed in U. S. A. )
AA, GO:9, WD, 131, 132:9-13

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