Air Cleaner Modification to Take K&N Paper Element

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Written by John Russell

This article describes a modification to the ZB oil-bath air filter unit that allows fitting a K&N  high flow filter charger elememt Part No. E-3492. (K&N Website here )

1. Remove air filter lid and oil bath element.  Air_Cleaner1

 2. Remove air filter assembly from air manifold.

3. Reverse the assembly on workbench and drill out the spot-welds holding the element inner housing to the outer casing.

4. Gently separate the 2 parts by tapping the inner housing through.

5. The next stage is to reduce the height of the inner housing to leave a 1Omm deep lip. Air_Cleaner2This will locate the K&N filter and retain strength in the remaining part of the housing. Use masking tape or a scriber to establish the circumferential line. Carefully remove the excess metal with a hacksaw fitted with a fresh HSS blade                                          

NOTE: The new filter fits neatly within the housing.

6. Deburr the cut edge of the housing and protect with Black epoxy paint to finish.

7. Reassemble the modified inner housing to the outer housing, no need to spot-weld as the unit no longer needs to retain oil.

8. Fit the new element, as easy as that. The new element comes already treated withAir_Cleaner3 K&N Filter oil ready to use.

9. The original outer casing and lid are retained.

9. No more messy oil bath cleaning or leakage.