Cummins/Onan VTA-28-G2 — Lubrication System Fill and Prime
Maintenance · engine lubrication system
For the Cummins/Onan VTA-28-G2, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFGA, Cummins/Onan DFGB, Cummins/Onan DFGC, Cummins/Onan VTA28-G3 engine, Cummins/Onan VTA28-G2 engine
Before you start
- Do not operate the coolant heater while the cooling system is empty or when the engine is running
Parts for this job
Part numbers from the service-parts lists for Cummins/Onan DFGB, Cummins/Onan DFGC. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Remove oil inlet line from turbocharger housing, fill bearing housing with clean engine lubricating oil; replace line and secure.
- Fill crankcase to 'L' (low) mark on dipstick.
- Remove plug from head of oil filter housing and connect a hand or motor-driven priming pump with pressure gauge to the plug boss in the filter housing.
- Prime until a 30 psi (207 kPa) pressure is obtained.
- Disconnect wire from fuel solenoid valve.
- On the Engine Control Panel, depress the Crank switch to crank the engine while maintaining an oil priming pressure of 15 psi (103 kPa) for 15 seconds at the filter head priming port.
- Stop engine cranking, remove external priming equipment, replace plug in filter housing and torque to 15 to 20 ft-lb (20 to 27 N·m).
- Reconnect wire to fuel solenoid valve.
- Complete oil fill to 'H' (high) mark on dipstick.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 30 psi (207 kPa) priming pressure
- 15 psi (103 kPa) during cranking
- plug torque 15 to 20 ft-lb (20 to 27 N·m)
Full service-parts list: Cummins/Onan DFGB →, Cummins/Onan DFGC →
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.