DeVille V8-4.6L VIN 9 (1995)
Camshaft Gear/Sprocket: Technical Service Bulletins
Engine - Component and Service Procedure Changes
Group Ref.: 6 - Engine
Bulletin No.: 476120
Date: August, 1994
INFORMATION
SUBJECT:
COMPONENT AND SERVICE PROCEDURE CHANGES
MODELS:
1994-95 CADILLAC CONCOURS, ELDORADO, SEVILLE WITH 4.6L NORTHSTAR ENGINE (VINs Y, 9 - RPOs LD8, L37)
Following is a list of changes affecting components and/or service procedures. These changes will be reflected in the procedures and information found
in the 1995 preliminary service manual.
Camshaft Drive Sprockets
All camshaft drive sprockets now have a "shot-blasted" or dull/rough finish instead of the previous shiny, machined finish. This change occurred during
the 1994 model year and will continue until further notification. Because this is a running change, some engines may have been built with both the
"shiny" and "rough" finish sprockets. Intermixing the sprockets does not affect engine performance or durability. In addition, the timing mark on the
intermediate sprocket will be changed from a circle to an ellipse.
Other than manufacturing process changes resulting in the new look and finish, the sprockets are no different from those used in early 1994.
Coolant Plug Elimination from Engine Block
Engine coolant drain plugs, located on either side of the engine block below the cylinder heads, are eliminated beginning with the 1995 model year.
Lost Core Fluid Induction System (FIS)
A new plastic intake manifold assembly will become standard on the 1995 model year Northstar engine. The manifold houses the fuel injectors, fuel rail
and is mainly comprised of the intake runners. The manifold eliminates the magnesium housing found on the 1994 model year engine and is held in place
with 10 bolts instead of the 4 bolts required to hold the 1994 FIS assembly.
Piston Wrist Pin
A new piston wrist pin was introduced during the 1994 model year. The wall thickness of the new wrist pin is constant throughout the length of the pin.
The previous design wrist pin had a formed "step." The step is a ridge located at the center of the pin that is approximately 3/8" long (see Figure 1).
