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Honda Civic Service Manual: Engine Oil Pump Overhaul (K24Z7)

Honda Civic Service Manual / Powertrain / Engine / Engine Lubrication / Engine Oil Pump Overhaul (K24Z7)

View

1. Oil Pump Exploded View

Exploded View


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Disassembly

NOTE: Refer to the Exploded View if needed during this procedure.


1. Engine Oil Pump Balancer Shaft End Play - Inspection

1.

Zero the dial indicator against the end of the rear balancer shaft, then push the rear balancer shaft back and forth and read the end play.


Balancer Shaft End Play

Standard (New):

0.063-0.108 mm (0.00248-0.00425 in)

Service Limit:

0.14 mm (0.0055 in)


2. Engine Oil Pump Housing

1.

Remove the pump housing.


3. Engine Oil Pump Balancer Shaft


1.

Remove the upper balancer shaft holder (with bearings) (A) and the baffle plates (B).


2.

Remove the front balancer shaft (C) and the rear balancer shaft (D).


4. Engine Oil Pump - Inspection

1.

Align the tip of the inner rotor tooth (A) with the mark (B) on the outer rotor, then check the inner rotor-to-outer rotor radial clearance between the inner rotor and the outer rotor. If the inner rotor-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.


Inner Rotor-to-Outer Rotor Radial Clearance

Standard (New):

0.050-0.150 mm (0.002-0.005 in)

Service Limit:

0.19 mm (0.007 in)


2.

Check the pump housing-to-rotor axial clearance between the rotor (A) and the pump housing (B). If the pump housing-to-rotor axial clearance exceeds the service limit, replace the oil pump.


Pump Housing-to-Rotor Axial Clearance

Standard (New):

0.035-0.070 mm (0.002-0.002 in)

Service Limit:

0.12 mm (0.004 in)


3.

Check the pump housing-to-outer rotor radial clearance between the outer rotor (A) and the pump housing (B). If the pump housing-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.


Pump Housing-to-Outer Rotor Radial Clearance

Standard (New):

0.150-0.210 mm (0.006-0.008 in)

Service Limit:

0.23 mm (0.009 in)


5. Engine Oil Pump Balancer Shaft - Inspection

1.

Measure the inner diameters of the No. 1 bearing for the front balancer shaft hole and the rear balancer shaft hole.


Bearing Inner Diameter

Front:

Standard (New):

20.000-20.020 mm (0.78740-0.78819 in)

Service Limit:

20.03 mm (0.7886 in)

Rear:

Standard (New):

24.000-24.020 mm (0.94488-0.94567 in)

Service Limit:

24.03 mm (0.9461 in)

Front


Rear


Front


Rear

2.

Measure the diameters of the No. 1 journal on the front balancer shaft and the rear balancer shaft.



3.

Clean both balancer shaft No. 2 journals and the bearing halves with a clean shop towel, then place both balancer shafts into the balancer holder.


4.

Place one strip of plastigage across each No. 2 journal.


5.

Reinstall the bearings and the upper balancer shaft holder, then tighten the bolts.

NOTE: Do not rotate the balancer shafts during inspection.


6.

Remove the upper balancer shaft holder and the bearings again, and measure the widest part with the plastigage. If the balancer shaft No. 2 journals oil clearance is out-of-tolerance, install new bearings, and recheck. If it is still out-of-tolerance, replace the balancer shafts.


No. 2 Journal Oil Clearance

Standard (New):

0.060-0.120 mm (0.00236-0.00472 in)

Service Limit:

0.15 mm (0.0059 in)


Reassembly

NOTE: Refer to the Exploded View if needed during this procedure.


1. Engine Oil Pump Balancer Shaft

1.

Align the punch mark on the rear balancer shaft in the center of the two punch marks on the front balancer shaft, then install the balancer shafts on the lower balancer shaft holder.



2.

Apply new engine oil to the threads of the 8 mm bolts (A).


3.

Install the upper balancer shaft holder (B) with a new O-ring (C).


2. Engine Oil Pump Housing

1.

Install the pump housing.


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