Cummins/Onan — Check/Adjust Valves And Injectors (07-05)

Adjustments

From a Cummins/Onan service manual covering: K 19, K19, KTA19, KTA19-M, KTA19G2, KTTA19, Kt19. Check it applies to your exact model before use.

Applies to: Cummins/Onan K 19, Cummins/Onan Kt19, Cummins/Onan K19 engine

Procedure

1. On engines with STC, remove the wire from the terminal on the oil control valve. Operate engine at high idle for 5 minutes, then shut off.
2. Remove the rocker lever cover and related components (Procedure 07-04).
3. Turn the barring device until the 'A' mark on the pulley aligns with the mark cast into the accessory drive seal boss.
4. Determine the cylinder in position for valve set: if mark A check cylinders 2,5; if B check 3,4; if C check 1,6. Set valves on the cylinder where both levers feel loose.
5. Adjust the crossheads first (loosen locknuts, turn adjusting screw out one turn, hold crosshead down, turn screw in until it touches the valve stem top).
6. Tighten the crosshead lock nut to 35/40 N·m as applicable.
7. Adjust the valves using a feeler gauge: Intake 0.36 mm [0.014 in], Exhaust 0.69 mm [0.027 in].
8. Tighten the locknut to 45 N·m [35 ft-lb] with adapter ST-669 or 60 N·m [45 ft-lb] without adapter.
9. Adjust the injector using the injector and valve adjustment kit Part No. 3375004.
10. Reset to the specified travel: 7.72 mm [0.304 in] less STC; 10.24 mm [0.403 in] with STC.
11. Tighten the locknut to 45 N·m [35 ft-lb] with adapter or 60 N·m [45 ft-lb] without adapter.
12. Rotate the engine, align the next mark, and adjust the appropriate valves and injectors until all are correct.

Full service-parts list: Cummins/Onan K 19 →, Cummins/Onan Kt19 →

Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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