The following process will cover the DOHC engine of the OBD-I Honda Prelude (93-95)

1 – With the engine cold, remove the upper timing belt cover, the valve cover, spark plugs and the distributor cap.

Both exhaust and intake valves are adjusted at the same time.

2 – Rotate the crankshaft until piston number one is on TDC compression stroke. To verify the position, the “UP” marks on both camshaft pulleys should be at the top, as in the illustration below, and the TDC grooves on these same pulleys, should align with the cylinder head surface.

Also check the distributor rotor. It must be pointing to the wire of the spark plug #1 on the ignition cap.

3 – Now, loosen the lock nuts on the valves of cylinder #1 and then adjust the valve clearances to the following specifications:

2.2L H22 Engine:

Intake Valves: .009 – .011 In. (.23 – .28 mm)
Exhaust Valves: .011 – .013 In. (.28 – .32 mm)

4 – After finishing adjusting the clearances of valves on cylinder #1, tighten the valve adjuster lock nuts to a torque of 15 ft lbs (20 N.m.) and recheck valve clearance. Readjust the clearance if necessary. It must be well calibrated before going to the next cylinder.

5 – After finishing cylinder #1, rotate the crankshaft counter-clockwise for 180 degrees. Make sure that cylinder #3 is at TDC and adjust the valve clearances as you did on cylinder #1.

Again, thighten the adjuster lock nuts to the same torque and recheck/readjust as necessary.

For cylinders 2 and 4, repeat from step 3 to 5 with them.

At the end put back the valve cover and the distributor cap. Tighten the timing cover bolts and the valve cover crown shaped nuts to a torque of 7 inch lbs or 10 N.m.

For the SOHC (2.3L) engine, the process is similar. Just valve clearances are different:

2.3L H23 Engine:

Intake Valves: .003 – .004 In. (.07 – .11 mm)
Exhaust Valves: .006 – .007 In. (.15 – .19 mm)

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