How to check intake and exhaust valve clearances?
Be sure to check the clearance on each of the intake and exhaust valves. Remember, the clearance spec on the exhaust valves is different than the intake, so you’ll need to select different feelers. Now, set the #3 piston at TDC by rotating the marks on the cam gears 90 degrees clockwise.
What’s the correct valve clearance for a Honda?
Once you’ve achieved the correct clearance, you’ll need to use a torque wrench to torque the locknut to the correct spec (again, the K20A2 spec is 14 ft./lbs.). When the locknut is tightened, you’ll have to recheck the clearance again.
What’s the difference between SOHC and DOHC ZC engines?
There are both SOHC and DOHC ZC engines. The non-VTEC SOHC ZC is similar to the D16A6 (’91–’96) and D16Y4 (’96–2000) engine, but with more aggressive cam timing. The SOHC VTEC ZC is similar to the D16Z6 (’91–’96). The DOHC ZC is similar to the D16A1, D16A3, D16A8, D16A9 and D16Z5 engines.
How big is a 12 valve Honda engine?
Rocker arm shaft pedestal bolts 16 Rocker arm shaft end cap bolts 9 Timing belt adjustment bolt 31 Valve Clearances 12 and 16 valve engines Intake and auxiliary valves .007 to .009 in (.17 to .22mm) Exhaust Valves (carbureted 12 valve engine) .007 to .009 in (.17 to .22mm) Exhaust Valves (all others) .009 to .011 in (.22 to .27mm) 8 valve engine
Why are clearances between CAMs and valves important?
When things get hot, they expand and without proper clearances to accommodate for the expansion, things will get bad fast. That’s why engines have clearances between the cams and valves to help out with the longevity of the engine. Getting the right amount of clearance is the key to a smooth performing engine.
Why is it important to check valve clearance?
Getting the right amount of clearance is the key to a smooth performing engine. If the gap is too big, you’ll end up with a lot of valve-train noise. If the gap is too small or if there’s no gap at all, the valves won’t seat fully in their optimum positions.
Be sure to check the clearance on each of the intake and exhaust valves. Remember, the clearance spec on the exhaust valves is different than the intake, so you’ll need to select different feelers. Now, set the #3 piston at TDC by rotating the marks on the cam gears 90 degrees clockwise.
Once you’ve achieved the correct clearance, you’ll need to use a torque wrench to torque the locknut to the correct spec (again, the K20A2 spec is 14 ft./lbs.). When the locknut is tightened, you’ll have to recheck the clearance again.