EXPERTEC TSB (T-93-130)

Publication date: 1993-08-19
Reference number: T-93-130

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): T-93-130, Date of Issue: 08/19/93

INFORMATION ON ENGINE BLOCK - HEATER APPLICATION

Model(s): 1982-94 Cadillac Models with 4.1L, 4.5L, 4.9L V8 Engine

Bulletin No.: Cadillac T-93-130

Date: 08/19/1993

BULLETIN ILLUSTRATION LIST

Fig 1: Graphic

Fig 2: Graphic

SERVICE INFORMATION

Beginning with model year 1987, 4.1L V8 engines received a structural redesign to the engine crankcase which prevents the 1982 through 1986 clamp-on engine block heater from being used. Consequently a revised block heater was released.

As these engines have now been subject to remanufacturing, situations may arise where the revised crankcase is used to produce a 1982-1986 application.

Fig. 1 shows the 1982-1986 version, and by comparison with Fig. 2 it can be seen that each crankcase requires a specific heater design. When conditions arise where the ribbed crankcase is used in a pre- 1987 vehicle with the engine block heater option, a new heater assembly (P/N 1642788) must be purchased.

Both block heater kits are currently available from GMSPO.