Cummins — Photo #7-18 - Valve Lash Adjustment

For these Cummins models: GTA8.3, GTA8.3 CD1, GTAR 3.

Procedure

7. After finding TDC for cylinder No. 1 use a flathead screwdriver and set the following valves. Cylinder No. Intake Valve Exhaust Valve 1 Yes Yes 2 Yes No 3 No Yes 4 Yes No 5 No Yes 6 No No
8. Tighten the locknut using a torque value of 24 Nem [18 ft-lb]. Check the valve lash again.
9. Mark the vibration damper and rotate the engine 360 degrees.
10. Using a flathead screwdriver and set the following valves. 7-12 Cylinder No. Intake Valve Exhaust Valve 1 No No 2 No Yes 3 Yes No 4 No Yes 5 Yes No 6 Yes Yes
11. Tighten the locknut using a torque value of 24 Nem [18 ft-lb]. Check the valve lash again.
12. Install the rubber seal into the groove in the valve cover. Start the installation at the overlap area. Do not stretch the rubber seal.
13. Install the valve cover using a torque value of 24 Nem [ 18ft.-Ib].
14. Install the crankcase vent tube and secure with the support clamps and hose clamp.
15. Install the air crossover tube (water - to - air only). C1 - Maintenance Check - 750 Hours or 6 Months Check/Clean/Replace * Ignition Timing Engine timing is a fixed value . However it depends upon the load, type & quality of the fuel, altitude and the rated speed (RPM) of the engine. The Altronic CD1 will need to be adjusted to the specific site conditions. It is therefore important that this adjustment is made by a qualified CNGE distributor or CNGE authorized deal- er service technician at the time of engine installation and start-up. Set initial engine timing to the appropriate value listed

Source: manual:CUMMINS GTA 8.3 Operation and Maintenance Manual 2001 (2).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.