Tech Tip: Avoid Cadillac Water Pump Installation Woes

Tech Tip: Avoid Cadillac Water Pump Installation Woes

Anyone who has ever changed a water pump on a 1985-'95 Cadillac 4.1L, 4.5L or 4.9L knows that it is a job they don’t want to have to redo due to a false step during installation. However, there is some useful information available that could help avoid a potentially big installation headache.

Anyone who has ever changed a water pump on a 1985-’95 Cadillac 4.1L, 4.5L or 4.9L knows that it is a job they don’t want to have to redo due to a false step during installation. However, there is some useful information available that could help avoid a potentially big installation headache.

These particular Cadillac models’ water pumps are tough to get to under the hood because of their tight location. Plus, the pumps are secured with what seems like hundreds of fasteners. What some installers may not realize is that there are two bolts located very close to the outside edge of the water pump that must not be disturbed during the pump’s replacement. THESE BOLTS SHOULD NOT BE REMOVED! (See figure below.)

Two bolts connect the timing cover to the water pump inlet cover located behind the timing cover. If the bolts are removed, the inlet cover gasket, which is sandwiched between the timing cover and the inlet cover, will likely shift and leak upon installation of the new pump. Coolant can seep downward, clinging to the timing cover as it runs, making it appear that the new water pump has developed a leak. Several unproductive hours (and more banged up knuckles) can result while locating and correcting this new leak. Additionally, the timing cover should be checked for flatness prior to pump installation. It may be dimpled where the 6mm studs protrude from the cover because of prior over-tightening of the corresponding nuts. A dimpled cover will prevent proper gasket sealing. Repairing today’s vehicles can be frustrating enough without allowing either of these unnecessary headaches to occur.

Be sure to remember that the fasteners should be tightened to proper torque value in a staggered pattern, alternating from one side of the pump to the other in a circular fashion, to make sure the gasket seats evenly. The torque specifications and sequence for the fasteners are as follows:

1. 4 torx head bolts = 30 FT. LBS.
2. 7 hex head nuts = 5 FT. LBS.
3. 1 stud = 30 FT. LBS.
4. 7 hex head bolts = 5 FT. LBS.

For more selling tips, technical information or water pump installation assistance, visit ASC Industries, Inc., online at www.asc-ind.com.

You May Also Like

Wheel Bearing Hub Damage Repair

Noise is a classic sign of a bad wheel bearing or wheel hub bearing. Determining why the damage happened may take some time.

igns of a worn wheel hub bearing may be difficult to detect yet failure to identify and correct the problem can cause damage before a driver even knows there is a problem. When damage occurs can be attributed to driving conditions and/or installation procedures. Noise is a classic sign of a bad wheel bearing or wheel hub bearing but determining exactly why the damage happened may take some investigation.

Electric Vehicle Battery Service

Don’t be afraid to work on battery packs. However, you should be mindful of the potential damage high voltages can cause.

ADAS Suspension Alignments

Look at the “big picture” and really consider how the vehicle will operate if things aren’t done correctly.

Building The Perfect Future By Mentoring

Share your stories of how you have helped others reach their goals.

Electric Power Steering Diagnostics

Load management for steering systems.

Other Posts

GRI Receives US DOT Certification For Safety

GRI tires will now incorporate the DOT code emboss on its side walls.

Active Ride Control Diagnostics

The key to servicing these systems is proper information and understanding precisely how these systems operate.

Brake Pad Errors and Mismatches

In order to make the right selection, you must do your homework while still remaining skeptical.

Axle Torque Procedures

Guessing the correct torque setting is a bad idea.