Honda CRX silhouetteCRX

Engine Tune-up — Valve Clearance Adjustment (DOHC Engine)

5-9prose procedure

Valve clearance procedure for the DOHC engine (D16A8/D16A9). DOHC clearances (Intake 0.13-0.17 mm, Exhaust 0.15-0.19 mm) differ from the SOHC values.

Continued from 5-8

DOHC Engine:

  1. 1
    Remove the valve cover.
    Top view of the DOHC cylinder head valve train identifying the EXHAUST valves (NO.1, NO.2, NO.3, NO.4) along the top and the INTAKE valves (NO.1, NO.2, NO.3, NO.4) along the bottom.
  2. 2
    Set the No. 1 piston at TDC. "UP" marks in the pulleys should be at top, and the TDC grooves on back side of pulley should align with cylinder head surface. The distributor rotor must be pointing towards No. 1 plug wire.
    Number 1 piston at TDC: dual cam pulleys showing the "UP" MARK on each pulley at top and the TDC GROOVES aligned with the cylinder head surface.
  3. 3
    Adjust valves on No.1 cylinder. Intake: 0.13-0.17 mm (0.005-0.007 in.). Exhaust: 0.15-0.19 mm (0.006-0.007 in.).
  4. 4
    Loosen locknut and turn adjust screw until feeler gauge slides back and forth with slight amount of drag.
    Close-up of valve adjustment showing hands using a feeler gauge and wrench on the adjust screw and locknut, with the locknut torque callout.
  5. 5
    Tighten locknut and check clearance again. Repeat adjustment if necessary.
  6. 6
    Rotate crankshaft 180° counterclockwise (cam pulley turns 90°). The "UP" marks should be at exhaust side. Distributor rotor should point to No.3 plug wire. Adjust valves on No. 3 cylinder.
    Number 3 piston at TDC: both cam pulleys with the "UP" MARKS at exhaust side; the EXHAUST CAM PULLEY and INTAKE CAM PULLEY are labelled, with rotation arrows.
  7. 7
    Rotate crankshaft 180° counterclockwise to bring No. 4 piston to TDC. Both "UP" marks should be at bottom and distributor rotor points to No.4 plug wire. Adjust valves on No.4 cylinder.
    Number 4 piston at TDC: both cam pulleys with the "UP" MARKS at bottom, with rotation arrows.
  8. 8
    Rotate crankshaft 180° counterclockwise to bring No. 2 piston to TDC. "UP" marks should be at intake side. Distributor rotor should point to No.2 plug wire. Adjust valves on No.2 cylinder.
    Number 2 piston at TDC: both cam pulleys with the "UP" MARKS at intake side, with rotation arrows.
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