GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Terrain 🢒 Engine 🢒 Engine Mechanical - 2.8L, 3.2L, or 3.6L 🢒 Camshaft Timing Drive Design Identification

Third Design
Object Number: 1989671 Size: LF
    • Timing chains are identical to second design.
    • The camshaft position actuator sensors are a new design.
    • The camshaft position actuators incorporate new sensor wheels that correspond with the new design of camshaft position actuator sensors.

Fourth Design
Object Number: 1989672 Size: LF
    • New secondary timing drive chains, inverted tooth (IT) design
    • The camshaft position actuators incorporate new sprockets that correspond with the use of IT chains on the secondary timing drive system.
    • The intake camshaft position actuators are different for the left and right sides.
    • The left and right secondary timing drive guides are new due to the use of IT chains on the secondary timing drive system.
    • The intermediate timing drive sprockets are new due to the use of IT chains on the secondary timing drive system.
    • New intake camshafts
    • New fourth design IT primary timing drive chain
    • New fourth design IT crankshaft sprocket
    • Fourth design IT primary chain is not interchangeable with second and third design.