Content .. 406 407 408 409 ..

Acura RL. Manual - part 408

4. Turn the ignition switch ON (II), and select PGM-FI, INSPECTION, then ALL INJECTORS OFF on

the HDS.

5. Remove the six ignition coils (see IGNITION COIL REMOVAL/INSTALLATION ).

6. Remove the six spark plugs.

7. Attach the compression gauge to the spark plug hole.

Fig. 5: Checking Engine Compression
Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Open the throttle fully, then crank the engine with the starter motor and measure the compression.

Compression Pressure:

Above 930 kPa (9.5 kgf/cm

, 135 psi)

9. Measure the compression on the remaining cylinders.

Maximum Variation:

Within 200 kPa (2.0 kgf/cm

, 28 psi)

10. If the compression is not within specifications, check the following items, then remeasure the

compression.



Damaged or worn valves and seats



Damaged cylinder head gasket



Damaged or worn piston rings



Damaged or worn piston and cylinder bore

11. Select PCM reset (see PCM RESET ) to cancel the ALL INJECTORS OFF function on the HDS.

VTEC ROCKER ARM TEST

Special Tools Required



VTEC air adapter 07VAJ-P8A010A



VTEC air stopper 070AJ-0030100

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:36 PM

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

Air pressure regulator 07AAJ-PNAA101

1. Start the engine and let it run for 5 minutes, then turn OFF the ignition switch.

2. Remove the cylinder head covers (see CYLINDER HEAD COVER REMOVAL ).

3. Set the No. 1 piston at top dead center (TDC) (see step 3 ).

4. Push on the intake mid rocker arm (A) for the No. 1 cylinder. The mid rocker arm should move

independently of the primary rocker arm (B) and secondary rocker arm (C).



If the mid rocker arm moves freely, go to step 5.



If the intake mid rocker arm does not move, remove the mid, primary, and secondary intake
rocker arms as an assembly, then check that the pistons in the mid and primary rocker arms
move smoothly. If any rocker arm needs replacing, replace the mid, primary, and secondary
rocker arms as an assembly, then retest.

Fig. 6: Pushing On Intake Mid Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Repeat step 4 on the remaining intake mid rocker arms with each piston at TDC. When all the mid

rocker arms pass the test, go to step 6.

6. Check that the air pressure on the shop air compressor gauge indicates over 690 kPa (7.0 kgf/cm

100 psi).

7. Inspect the valve clearance (see step 4 ).

8. Remove the No. 1 and No. 6 intake rocker shaft mounting bolts, then install and connect the air

pressure regulator, VTEC air adapter, and VTEC air stopper as shown.

FRONT

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:36 PM

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Fig. 7: Identifying Air Pressure Regulator, VTEC Air Adapter And VTEC Air Stopper (Front)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

REAR

Fig. 8: Identifying Air Pressure Regulator, VTEC Air Adapter And VTEC Air Stopper (Rear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

9. Loosen the valve on the regulator, and apply the specified air pressure.

Specified Air Pressure:

440-540 kPa (4.5-5.5 kgf/cm

, 64-78 psi)

10. Make sure that the intake primary rocker arm (A) and intake secondary rocker arm (B) are

mechanically connected by the piston and that the mid rocker arm (C) does not move when pushed
manually. If any intake mid rocker arm moves independently of the primary and secondary rocker
arms, replace the rocker arms as a set.

NOTE:

If the synchronizing pistons do not move after applying air pressure,
move the primary or secondary rocker arm up and down manually.

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:36 PM

Page 7

Fig. 9: Inspecting Rocker Arm Function
Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Remove the air pressure regulator, VTEC air adapter, and VTEC air stopper.

12. Tighten the rocker shaft bolts to 24 N.m (2.4 kgf.m, 17 lbf.ft)

13. Install the cylinder head covers (see CYLINDER HEAD COVER INSTALLATION ).

VALVE CLEARANCE ADJUSTMENT

1. Remove the right upper fender trim (see step 1 ).

2. Remove the cylinder head covers (see CYLINDER HEAD COVER REMOVAL ).

3. Set the No. 1 piston at top dead center (TDC). Align the pointer (A) on the front upper cover with the

No. 1 piston TDC mark (B) on the front camshaft pulley.

Fig. 10: Aligning Front Upper Cover Pointer With Piston 1 TDC Mark On Front Camshaft
Pulley
Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Select the correct thickness feeler gauge for the valves you're going to check.

Valve Clearance

NOTE:

Adjust the valves only when the cylinder head temperature is less than 100°F
(38°C).

2007 Acura RL

2005-08 ENGINE Cylinder Head - RL

Friday, June 05, 2009 3:18:36 PM

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