TM-9-2815-224-34-P

ENGINE, DIESEL:8-CYLINDER TURBOCHARGED, DETROIT DIESEL CORPORATION MODEL 8V92TA

DIRECT SUPPORT AND GENERAL SUPPORT MAINTENACE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST

JANUARY 1988

TM-9-2815-224-34-P - Page 218 of 554

TM9-2815-224-34&P

Valve Mechanism Maintenance Instructions (Cont)

7-11. IDLER GEAR REMOVAL/REPAIR/INSTALLATION (CONT).

(15)

(16)

(17)

(18)

NOTE

To check idler gear pre-load, do steps (15) through (25).

Mount idler gear (1) in soft jaw vise.

Mount two test fixture plates (9 and 10) on idler gear (1) with screw (11) and nut (12). Tighten to

90 lb-ft (122 N•m).

Mount test fixture plate (13) on idler gear (1) with three screws (14), lockwashers (15), and

washers (16). Tighten to 40 lb-ft (54 N•m).

Place plate (10) in jaws of vise.

NOTE

Pull to start gear moving must not be less than 0.5 lb (0.23 kg) or more

than 4.0 lbs (1.8 kg).

(19)

(20)

(21)

Wrap cord several times around idler gear assembly (1) and attach

spring scale.

Pull idler gear assembly (1) several times and record pull required to

start gear moving. Maximum difference between pulls is 2 lbs,

11 ounces (1.22 kg).

If difference between pulls does not fall in correct ranges, replace

bearings.

7-40