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Acura RL. Manual - part 420

ROCKER ARM AND SHAFT INSPECTION

1. Remove the rocker arm assembly (see ROCKER ARM ASSEMBLY REMOVAL ), then

disassemble the rocker arm assembly (see ROCKER ARM AND SHAFT
DISASSEMBLY/REASSEMBLY ).

2. Measure the diameter of the shaft at the first rocker location.

Fig. 98: Identifying Intake And Exhaust Rocker Shaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:37 PM

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Fig. 99: Measuring Rocker Shaft Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Zero the gauge (A) to the shaft diameter.

Fig. 100: Zeroing Gauge To The Shaft Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.

Rocker Arm-to-Shaft Clearance

Standard (New):

Intake: 0.026-0.067 mm (0.0010-0.0026 in.)

Service Limit: 0.067 mm (0.0026 in.)

Exhaust: 0.026-0.077 mm (0.0010-0.0030 in.)

Service Limit: 0.077 mm (0.0030 in.)

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:37 PM

Page 54

Fig. 101: Measuring Inside Diameter Of Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Repeat for all rockers and both shafts. If the clearance is over the limit, replace the rocker shaft and all

over-tolerance rocker arms. If any intake rocker arm needs replacement, replace all three rocker arms
in that set (primary, mid, and secondary).

VTEC Rocker Arms

6. Inspect the rocker arm pistons (A). Slide them into the rocker arms. If they do not move smoothly,

replace the rocker arm set.

7. Install the rocker arm assembly (see CAMSHAFT, ROCKER ARM ASSEMBLY, CAMSHAFT

SEAL, AND PULLEY INSTALLATION ).

CAMSHAFT INSPECTION

NOTE:



Apply new engine oil to the pistons when reassembling.



When reassembling the primary rocker arm (B), carefully apply air
pressure to the oil passage of the rocker arm.

Fig. 102: Identifying Rocker Arm Pistons And Primary Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:37 PM

Page 55

1. Remove the cylinder head (see CYLINDER HEAD REMOVAL ).

2. Remove the rocker arms (see ROCKER ARM ASSEMBLY REMOVAL ).

3. Put the rocker shafts on the cylinder head, then tighten the bolts to the specified torque.

Specified Torque

8 x 1.25 mm

24 N.m (2.4 kgf.m, 17 lbf.ft)

Fig. 103: Identifying Tightening Sequence Of Rocker Shafts Bolts
Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Seat the camshaft by pushing it toward the rear of the cylinder head.

5. Zero the dial indicator against the end of the camshaft. Push the camshaft back and forth and read the

end play. If the end play is beyond the service limit, replace the thrust cover and recheck. If it is still
beyond the service limit, replace the camshaft.

Camshaft End Play

Standard (New): 0.05-0.20 mm (0.002-0.008 in.)

Service Limit: 0.20 mm (0.008 in.)

Fig. 104: Measuring Camshaft End Play
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:37 PM

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