New Product Information. GMC Truck GMC K Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 New Product Information

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•	Spark plug port adapter J 23590 has been replaced by J 22794 .

•	The crankshaft balancer remover/installer J 39046 has been replaced by J 23523-F .