For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Express 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 New Product Information

New Product Information for Chevrolet Express 1999

The purpose of New Product Information is to highlight important technical changes from the previous model year.

Changes may include one or more of the following items:

•	Torque values and/or fastener tightening strategies

•	Changed engine specifications

•	New sealants and/or adhesives

•	Disassembly and assembly procedure revisions

•	Engine mechanical diagnostic procedure revisions

•	New special tools required

•	A component comparison from the previous year

•	Cylinder head bolts are tightened in four passes.

•	Upper intake manifold bolts are tightened in two passes.

•	Crankshaft connecting rod diameter has changed slightly.

•	Piston pin diameter specification was changed slightly.

•	Engine front cover removal procedure has been revised.

•	Reluctor ring removal procedure has been revised.

•	Install a NEW oil pump driveshaft retainer whenever removing or installing an oil pump assembly.

•	Oil bypass valve removal and installation procedure has been revised.

•	Upper intake manifold bolt tightening sequence revised.

A new engine mechanical Base Engine Misfire chart has been added. Refer to Base Engine Misfire Diagnosis .

•	The valve lifter remover pliers J 3049-A replaces J 9290-01 .

•	Spark plug port adapter J 23590 has been replaced by J 22794 .

•	The crankshaft balancer remover/installer J 39046 has been replaced by J 23523-F .