Custom Cruiser RWD V8-307 5.0L (1985)
Intake Manifold Gasket: All Technical Service Bulletins
Intake Manifold Gaskets - Loss of Coolant
SUBJECT
INTAKE MANIFOLD GASKETS
NUMBER: 86-T-13
DATE:
Jan. 27, 1986
MODELS/YEARS
1985 CUTLASS SUPREME, DELTA 88 &
TORONADO; 1986 CUTLASS SUPREME &
CUSTOM CRUISER WITH 5.OL
SECTION: 6A
V-8 ENGINE (VIN CODE Y)
A mid-year change has been made in the intake manifold gasket. All 1985 and early 1986 models with 5.OL (VIN Code Y) engines used a gasket with an
insulating sheath applied to the gasket in the area that contacts the intake manifold. This insulating material is dark orange in color.
LOSS OF COOLANT
There have been cases where the sheath in the area of the coolant passages has deteriorated which resulted in a leak. Most coolant leaks are external;
however, there have been cases where coolant leaks have been internal. When investigating a loss of coolant, and a leak is not obvious, remove the
intake manifold and examine the gasket for deterioration and evidence of an internal leak in the area of the coolant passages. If an internal leak is found,
replacement of heads, blocks or intake manifolds is unnecessary.
REVISED SERVICE GASKETS
The service gaskets will, in the near future, be revised to delete the insulation sheath. When using one of the revised gaskets, it is essential that sealer,
part no. 1050026 or equivalent be applied to both sides of the gasket where it contacts the cylinder head and the intake manifold.
Please revise your 1985 Chassis Service Manual and 1986 New Product Service Information Manual
-
All Series Except Toronado with this information.
SUBJECT
ALUMINUM INTAKE MANIFOLD CORROSION (REPAIR
PROCEDURE)
MODELS/YEARS
1985 CUTLASS SUPREME, DELTA 88, CUSTOM
CRUISER AND TORONADO MODELS 1986 CUTLASS SUPREME AND CUSTOM CRUISER MODELS EQUIPPED WITH 5.0L (VIN CODE Y)
ENGINE
NUMBER:
86-T-13A
CORP.REF.NO: 976102R
DATE:
April 1989
SECTION:
6A