Mechanics

MODELS S2000 ROCKER ARMS

2003 Honda Other

Engine Mechanical problem
2003 Other Honda Models 4 cyl Front Wheel Drive Manual 37,000 miles

I looked at trading in my S2000 and the dealer said the rocker arm was bad. I don't notice any performance issue or shakes - what does this mean, and is it expensive to repair?
Thanks
Avatar
Flygrrrl
November 16, 2008.




VTEC Rocker Arm Test
Special Tools Required
Air pressure regulator 07AAJ-PNAA100
Gauge joint adapter 07LAK-PR3A101
VTEC air adapter (2) 07ZAJ-PNAA 100
Air joint adapter 07ZAJ-PNAA300
Start the engine and let it run for 5 minutes, then turn the ignition switch OFF.
Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL ).
Set the No. 1 piston at top dead center (TDC) (see step 2 ).
Move the secondary rocker arm (A) for No. 1 cylinder. The secondary rocker arm should move independently of the mid rocker arm (B).
If the secondary rocker arm moves independently of the mid rocker arm, go to step 5.
If the secondary rocker arm does not move, remove the mid, primary, and secondary rocker arms as an assembly, and 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.
Fig. 7: Moving Secondary Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Repeat step 4 on the remaining rocker arms with each piston at TDC. When all the secondary rocker arms pass the test, go to step 6
Check that the air pressure on the shop air compressor gauge indicator is over 400 kPa (4 kgf/cm2, 57 psi).
Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT ).
Remove the No. 3 and No. 4 camshaft holder bolts, and install the VTEC air adapters (A) finger-tight.
Fig. 8: Installing VTEC Air Adapters
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Install the gauge joint adapter (B) to the inspection hole (C).
Connect the air joint adapter (D) to the VTEC air adapters.
Connect the air pressure regulator (E) to the air joint adapter.
Loosen the valve on the regulator, then apply the specified air pressure.
Specified Air Pressure: 290 kPa (3.0 kgf/cm2, 42 psi)
NOTE: If the synchronizing piston does not move after applying air pressure, move the primary and secondary rocker arms up and down manually by rotating the crankshaft clockwise.

With the specified air pressure applied and the piston at TDC, move the secondary rocker arm (A). The mid rocker arm (B), primary rocker arm (C), and secondary rocker arm should move together.
If the three rocker arms move together, go to step 14.
If the three rocker arms does not move together, remove the mid, primary, and secondary rocker arms an assembly, and check that the pistons in the mid and primary rocker arms move smoothly. If rocker arm needs replacing, replace the mid, primary, and secondary rocker arms as an assembly.
Fig. 9: Moving Mid Rocker Arm, Primary Rocker Arm And Secondary Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Repeat step 13 the remaining intake rocker arms with each piston at TDC. When all the rocker arms pass the test, go to step 15.
Remove the special tools.
Tighten the camshaft holder bolts to 22 N.M (2.2 kgf.M, 16 lbf. Ft).
Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION ).
Valve Clearance Adjustment
NOTE: Adjust the valves only when the cylinder head temperature is less than 100 F (38 C).

Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL ).
Set the No. 1 piston at top dead center (TDC). The TDC marks (A) on the cam chain sprocket should align with the cylinder head surface.
Fig. 10: Aligning TDC Marks On Cam Chain Sprocket With Cylinder Head Surface
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Select the correct thickness feeler gauge for the valves you're going to check.
Intake: 0.21-0.25 mm (0.008-0.010 in.)
Exhaust: 0.25-0.29 mm (0.010-0.011 in.)
Adjusting screw location: Fig. 11: Identifying Intake And Exhaust Valves
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Insert the feeler gauge (A) between the adjusting screw and the end of the valve stem and slide it back and forth; you should feel a slight amount of drag.
Fig. 12: Inserting Feeler Gauge Between Adjusting Screw And End Of Valve Stem
Courtesy of AMERICAN HONDA MOTOR CO, INC.
If you feel too much or too little drag, loosen the locknut (A), and turn the adjusting screw (B) until the drag on the feeler gauge is correct.
Fig. 13: Loosening Locknut With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Tighten the locknut and recheck the clearance. Repeat the adjustment, if necessary.
Rotate the crankshaft 180 clockwise (camshaft gears turn 90 )
Fig. 14: Rotating Crankshaft 180 Clockwise (Camshaft Gears Turn 90 ) (1 Of 3)
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
Rotate the crankshaft 180 clockwise (camshaft gears turn 90 )
Fig. 15: Rotating Crankshaft 180 Clockwise (Camshaft Gears Turn 90 ) (2 Of 3)
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
Rotate the crankshaft 180 clockwise (camshaft gears turn 90 )
Fig. 16: Rotating Crankshaft 180 Clockwise (Camshaft Gears Turn 90 ) (3 Of 3)
Courtesy of AMERICAN HONDA MOTOR CO, INC.
Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION ).

Dave H
Nov 27, 2008.


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