Cummins/Onan — Heavy Duty Air Cleaner Installation
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFEJ, Cummins/Onan DFEK, Cummins/Onan QSX15-G9 engine
Before you start
- Prevent accidental starting by disconnecting the starting battery cables (negative first).
- Always disconnect a battery charger from its AC source before disconnecting the battery cables.
Parts for this job
Part numbers from the service-parts lists for Cummins/Onan DFEJ, Cummins/Onan DFEK. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Make sure the generator set is disabled: stop the set, activate the E-stop, disconnect the battery charger and disconnect the negative (-) battery cable.
- Install the air filter support assembly on the engine using M8 x 20 mm hex head screws.
- Secure the rear air filter bracket assembly to the engine with four 3/4-10 x 1-1/2 inch screws and lock washers; torque to 420 N·m.
- Secure the top air filter support and five air filter brackets with M8 x 20 mm hex head screws; torque to 24 N·m.
- Use four M10 screws, flat washers and hex nuts and two mounting bands to secure each air filter; torque M10 screws to 52 N·m and band screws to 5.5 N·m.
- Install an air inlet hood on each of the air filters.
- Make sure the interior of the connections between the air cleaner outlet and the turbocharger inlet end of the elbow are clean.
- Secure a hose hump on each outside air filter with one large hose clamp.
- Secure an air tube to each hose hump with one medium hose clamp.
- Secure an intake elbow to each air tube with one medium hose clamp.
- Secure a reducer insert to each inside air filter with one large hose clamp.
- Secure a hose elbow on each reducer insert with one large hose clamp.
- Secure the intake manifold and air tube to the elbows with two large and two medium hose clamps.
- Secure a reducer insert and reducer elbow on the intake manifold and air tube with two medium hose clamps.
- Install the filter fittings and service indicators, reconnect the negative battery cable, connect the battery charger and place the control in the desired mode.
Tools required
- Insulated wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 3/4-10 x 1-1/2 inch screws: 420 N·m
- M8 screws: 24 N·m
- M10 screws: 52 N·m
- Mounting band screws: 5.5 N·m
Full service-parts list: Cummins/Onan DFEJ →, Cummins/Onan DFEK →
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.