Engine 01 Caterpillar 01–03 Pacbrake® Inspection and Maintenance On Caterpillar engines, there is a red and green decal on the side of the idler arm mount. See Fig. 4 . A properly tensioned belt is indicated by the shoulder of the idler arm aligned with the green zone of the decal. As the belt stretches, the shoulder will drift into the red zone. If the idler arm shoulder moves into the red zone, the belt needs to be replaced. Cummins With frequent use, the Pacbrake exhaust brake will operate maintenance-free. If the vehicle is used in- consistently or seasonally, it will be necessary to per- form preventative maintenance.
If the vehicle is ex- posed to excess moisture, or is used only for periodical or seasonal use, perform the following steps. On Cummins engines, a properly tensioned belt is indicated by the stop bar being in the center between the idler arm stops. See Fig. 5 . As the belt stretches, the idler arm stop will rotate to the stop bar. If the idler arm stop has rotated to contact the stop bar, the belt needs to be replaced. Detroit Diesel Series 60 1. With the engine off, using any oil-free or non- petroleum-based high-heat lubricant, spray or coat a sufficient amount on the restricter valve shaft and the attaching locations at each end of the actuation cylinder. 2.
With your hands or a pair of pliers, motion the valve several times to distribute the lubricant down the shaft and the attaching locations. NOTE: Operation of the Pacbrake could be af- fected by starting the engine and idling for short periods of time. During a cold engine start-up, moisture occurs in the engine and exhaust sys- tem that creates a corrosion hazard. The brake housing may trap water in the valve shaft bore, causing a corrosion hazard. The brake housing may trap water in the valve shaft bore, causing corrosion resulting in an improper or non- functioning brake.
If it is necessary to periodi- cally start the engine, attain normal operating temperatures before shutting the engine down. The idler arm pivot on Detroit Diesel Series 60 en- gines has a pointer cast into the arm. See Fig. 6 . This pointer should align with the V-groove mark at the rear of the mount, when belt tension is correct. As the belt stretches, the pointer will drift to the left of the V-groove. If the pointer is moved past the end of the V-groove, the belt needs to be replaced. Belt Routing Refer to the following diagrams for belt routings on the various engines. Caterpillar: See Fig. 7 for CAT 3126B model. See Fig. 8 for CAT C10 and C12 models.
01–04 Engine-Support Fasteners Check (Noise Emission Control) See Fig. 9 for CAT C15 and C16 models. Cummins: See Fig. 10 for Cummins ISX Signature 600 model, pre-2007. Front and rear engine supports for vehicles built from January 2007 require no periodic maintenance. Mounts should be inspected when the engine is re- moved for service. For vehicles manufactured prior to January 2007, perform the following check. See Fig. 11 for Cummins ISM model. See Fig. 12 for Cummins N14 model. See Fig. 13 for Cummins ISX models, 2007 or later. Check the rear engine-support fasteners (see Fig. 17 , Ref. 3) for tightness. Tighten the 5/8-inch fasteners 150 to 180 lbf·ft (203 to 244 N·m). See Fig.
14 for Cummins ISC and ISL models. Detroit Diesel: See Fig. 15 for DD Series 60 model. Check the front engine-support fasteners for tight- ness. Tighten the 3/4-inch fasteners 260 to 310 lbf·ft (350 to 420 N·m). See Fig. 16 for DD 13/15/16 models. Western Star Maintenance Manual, September 2015 01/2