Acura RL. Manual - part 421

6. Remove the camshaft thrust cover (A), then pull out the camshaft (B). 

Fig. 105: Identifying Camshaft Thrust Cover And Camshaft 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

7. Wipe the camshaft clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, 

scored, or excessively worn.  

8. Measure the diameter of each camshaft journal. 

Fig. 106: Measuring Diameter Of Camshaft Journal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

9. Zero the gauge to the journal diameter. 

 

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2005-08 ENGINE Cylinder Head - RL

  

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Fig. 107: Zeroing Gauge To The Journal Diameter 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

10. Clean the camshaft bearing surfaces in the cylinder head. Measure the inside diameter of each 

camshaft bearing surface, and check for an out-of-round condition. 



If the camshaft-to-holder clearance is within limits, go to step 12.  



If the camshaft-to-holder clearance is beyond the service limit and the camshaft has been 
replaced, replace the cylinder head.  



If the camshaft-to-holder clearance is beyond the service limit and the camshaft has not been 
replaced, go to step 11.  

Camshaft-to-Holder Oil Clearance  

Standard (New): 0.050-0.089 mm (0.0020-0.0035 in.)  

Service Limit: 0.15 mm (0.006 in.)  

Fig. 108: Measuring Inside Diameter Of Camshaft Bearing Surface 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

11. Check total runout with the camshaft supported on V-blocks. 

 

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2005-08 ENGINE Cylinder Head - RL

  

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

If the total runout of the camshaft is within the service limit, replace the cylinder head.  



If the total runout is beyond the service limit, replace the camshaft and recheck the oil 
clearance. If the oil clearance is still out of tolerance, replace the cylinder head.  

Camshaft Total Runout  

Standard (New): 0.03 mm (0.001 in.) max.  

Service Limit: 0.04 mm (0.002 in.)  

Fig. 109: Measuring Camshaft Total Runout 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

12. Measure cam lobe height. 

Cam Lobe Height Standard (New):  

CAM LOBE HEIGHT SPECIFICATION 

 

INTAKE

EXHAUST

PRI

35.112 mm (1.3824 in.)

36.389 mm (1.4326 in.)

MID

36.394 mm (1.4328 in.)

SEC

35.112 mm (1.3824 in.)

PRI: Primary 
IN: Intake

MID: Mid 

EX: Exhaust

SEC: Secondary 

T/B: Timing Belt

 

2007 Acura RL 

2005-08 ENGINE Cylinder Head - RL

  

me 

 

Friday, June 05, 2009 3:18:37 PM

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 110: Identifying Cam Lobe Height 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

VALVE, SPRING, AND VALVE SEAL REMOVAL 

Special Tools Required  

Valve spring compressor attachment 07757-PJ1010A 

Label the valves and valve springs as they are removed so that each item can be reinstalled in its original 
position. 

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

2. Using an appropriate-sized socket (A) and plastic mallet (B), lightly tap the valve retainer to loosen 

the valve cotters. 

Fig. 111: Tapping Valve Retainer 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Install the special tool. Compress the spring and remove the valve cotters. 

 

2007 Acura RL 

2005-08 ENGINE Cylinder Head - RL

  

me 

 

Friday, June 05, 2009 3:18:37 PM

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© 2005 Mitchell Repair Information Company, LLC.