How-To/DIY: Valve Clearance Adjustment

NOTE:

  • Valves should be adjusted cold; at a cylinder head temperature of less than 100°F (38°C).

  • Adjustment is the same for both intake and exhaust valves.

  • After adjusting, re-torque the crankshaft pulley bolt to 177 N∙m (18.0 kgf∙m, 130 lbf∙ft).

  • Valve Clearance Range:

    • Intake:     0.08 – 0.12 mm (0.003 – 0.005 in)
    • Exhaust:  0.16 – 0.20 mm (0.006 – 0.008 in)

 

Step 1:


Remove all spark plug wires & cylinder head cover by removing seven 10mm nuts.

Valve Clearance Adjustment (1) Valve Clearance Adjustment (2)a Valve Clearance Adjustment (3)

 

Adjusting Screw Locations

Valve Clearance Adjustment (4)a

 

Step 2:

Set the No. 1 piston at top dead center (TDC) by rotating the crankshaft pulley counter-clockwise until the “UP” mark on the pulley should be at the top, and the TDC grooves on the pulley should align with the TDC groove on timing belt back cover.

TDC mark (painted white) on the crankshaft pulley should align with pointer on the timing belt lower cover.

Number 1 Piston at Top Dead Center:

Valve Clearance Adjustment (5)a Valve Clearance Adjustment (6)a

Valve Clearance Adjustment (8) Valve Clearance Adjustment (9)a

 

Step 3:

Adjust valve clearances on No. 1 cylinder.

Intake:     0.08 – 0.12 mm (0.003 – 0.005 in)

Exhaust:  0.16 – 0.20 mm (0.006 – 0.008 in)

 




Step 4:

Loosen the lock-nut and turn the adjusting screw until feeler gauges slides back and forth with a slight amount of drag.

Lock-nut torque is 25 N∙m (2.5 kgf∙m, 18 lbf∙ft).

Valve Clearance Adjustment (7)

 

Step 5:

Tighten the lock-nut and recheck clearance again. Repeat adjustment if necessary.

 

Step 6:

Rotate the crankshaft 180° counter-clockwise (camshaft pulley turns 90°).

The “UP” mark should be on the exhaust side.

Adjust valves on No. 3 cylinder.

 

Step 7:

Rotate the crankshaft 180° counter-clockwise to bring No. 4 piston to Top Dead Center.

The “UP” mark should be pointing straight down.

Adjust valves on No. 4 cylinder.

 

Step 8:

Rotate the crankshaft 180° counter-clockwise to bring No. 2 piston to Top Dead Center.

The “UP” mark should be on the intake side.

Adjust valves on No. 2 cylinder.

 

Step 9:

Reinstall cylinder head cover. Do not forget to add gasket sealant on the corners of the valve cover gasket.

Valve Clearance Adjustment (10)

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