1982-83 200SX Twin Plug Engines - Z series engine
See Figures 1, 2, 3 and 4
- The valves must be adjusted with the engine WARM, so start the car and run the engine until the needle on the temperature gauge reaches the middle of the gauge. After the engine is warm, shut it off.
- Purchase either a new gasket or some silicone gasket sealer before removing the camshaft cover. Counting on the old gasket to be in good shape is a losing proposition. Always use new gaskets. Note the location of any wires and hoses which may interfere with cam cover removal, disconnect them and move them to one side. Remove the bolts holding the cover in place and remove the cover. Remember, the engine will be hot, so be careful.
- Place a wrench on the crankshaft pulley bolt and turn the engine over until the first cam lobe behind the camshaft timing chain sprocket is pointing straight down.
If you decide to turn the engine by bumping it with the starter, be sure to disconnect the high tension wire from the coil(s) to prevent the engine from accidentally starting and spewing oil all over the engine compartment. Never attempt to turn the engine by using a wrench on the camshaft sprocket bolt. There is a one to two turning ratio between the camshaft and the crankshaft which will put a tremendous strain on the timing chain.
- See the illustration for primary adjustment and check the clearance of valves (1), (4), (6), and (7) using a flat bladed feeler gauge. The feeler gauge should pass between the valve stem end and the rocker arm screw with a very slight drag. Insert the feeler gauge straight, not at an angle.
- If the clearance is not within specified value (0.012 in.) 0.30mm, loosen the rocker arm lock nut and turn the rocker arm screw to obtain the proper clearance. After correct clearance is obtained, tighten the lock nut.
- Turn the engine over so that the first cam lobe behind the camshaft timing chain sprocket is pointing straight up and check the clearance of the valves marked (2), (3), (5), and (8) in the secondary adjustment illustration. They, too, should be adjusted to specifications as in Step 5.
- Install the cam cover gasket, the cam cover and any wires and hoses which were removed.
1984-88 200SX with the CA20E, CA18ET and VG30E Engines
See Figures 5 and 6
Starting in mid year 1986-88 the CA20E engine in the 200SX model valves are non-adjustable. On V6 equipped 200SX models the valves are also non-adjustable. Refer to Valve Clearance column in the Tune-Up Specifications Chart.
Valve adjustment should be made while engine is warm but no running. Follow the procedure above for 1982-83 models, with the following exceptions: on Step 4, check and adjust the clearance valves 1, 2, 4 and 6 as shown in the accompanying illustration. This is with No. 1 cylinder at TDC on compression. On Step 6, check and adjust the clearance on valves 3, 5, 7 and 8 with the No. 4 cylinder at TDC on compression.
1982-92 Stanza with the CA20, CA20E And KA24E Engines
See Figures 7 and 8
On Stanza models from 1987-92 (except 1986-88 station wagons) no routine valve adjustment is necessary or possible these models are equipped with hydraulic lash adjusters, which continually take up excess clearance in the valve train.
Datsun/Nissan recommends that valve adjustment should be done every 12 months or 15,000 miles.
- Run the engine until it reaches normal operating temperature. Oil temperature, not water temperature, is critical to valve adjustment. With this in mind, make sure the engine is fully warmed up since this is the only way to make sure the parts have reached their full expansion. Generally speaking, this takes around 15 minutes. After the engine has reached normal operating temperature, shut it off.
- Purchase a new valve cover gasket before removing the valve cover. The new silicone gasket sealers are just as good or better if you can't find a gasket.
- Note the location of any hoses or wires which may interfere with valve cover removal, disconnect and move them aside. Remove the bolts which hold the valve cover in place.
- After the valve cover has been removed, the next step is to get the number one piston at TDC on the compression stroke. There are at least two ways to do this: Bump the engine over with the starter or turn it over by using a wrench on the front crankshaft pulley bolt. The easiest way to find TDC is to turn the engine over slowly with a wrench (after first removing No. 1 plug) until the piston is at the top of its stroke and the TDC timing mark on the crankshaft pulley is in alignment with the timing mark pointer. At this point, the valves for No. 1 cylinder should be closed.
Make sure both valves are closed with the valve springs up as high as they will go. An easy way to find the compression stroke is to remove the distributor cap and observe which spark plug lead the rotor is pointing to. If the rotor points to No. 1 spark plug lead, No. 1 cylinder is on its compression stroke. When the rotor points to the No. 2 spark plug lead, No. 2 cylinder is on its compression stroke.
- Set the No. 1 piston at TDC of the compression stroke, then check and/or adjust the valve clearance on Stanza (1982 model only) Nos. 1, 4, 6 and 7; on the Stanza (1983-86 and 1986-88 Stanza wagon), Nos. 1, 2, 4 and 6.
- To adjust the clearance, loosen the lock-nut with a wrench and turn the adjuster with a screwdriver while holding the lock-nut. The correct size feeler gauge (0.012 in.) 0.30mm should pass with a slight drag between the rocker arm and the valve stem.
- Turn the crankshaft one full revolution to position the No. 4 piston at TDC of the compression stroke. Check and/or adjust the valves (counting from the front to the rear) on the Stanza (1982 model only), Nos. 2, 3, 5 and 8; on the Stanza (1983-86 and 1986-88 Stanza wagon), Nos. 3, 5, 7 and 8.
- Replace the valve cover and torque the bolts on the valve cover down evenly. Check oil level.
1989-92 240SX with the KA24E and KA24DE Engines
See Figures 9 and 10
On the 240SX KA24E engine no routine valve adjustment is necessary or possible these models are equipped with hydraulic lash adjusters, which continually take up excess clearance in the valve train.
Datsun/Nissan recommends that valve adjustment on the KA24DE engine should only be done if valve noise increases.KA24DE ENGINE
- Run the engine until it reaches normal operating temperature and shut if off.
- Remove the rocker cover and all spark plugs.
- Set No. 1 cylinder at TDC on compression stroke. Align pointer with TDC mark on crankshaft pulley. Check that the valve lifters on No. 1 cylinder are loose and valve lifters on No. 4 are tight. If not turn crankshaft one revolution 360° and align as above.
- Refer to the illustration. Check both No. 1 intake and both No.1 exhaust valves, both No. 2 intake valves and both No. 3 exhaust valves. Using a feeler gauge, measure the clearance between valve lifter and camshaft. Record any valve clearance measurements which are out of specification. Intake Valve clearance (hot) is 0.012-0.015 in. (0.30-0.38mm) and exhaust valve clearance (hot) is 0.013-0.016 in. (0.33-0.40mm).
- Turn crankshaft one revolution 360° and align mark on crankshaft pulley with pointer. Refer to the illustration. Check both No. 2 exhaust valves, both No. 3 intake valves, both No. 4 intake valves and both No. 4 exhaust valves. Using a feeler gauge, measure the clearance between valve lifter and camshaft. Record any valve clearance measurements which are out of specification. Intake valve clearance (hot) is 0.012-0.015 in. (0.30-0.38mm) and exhaust valve clearance (hot) is 0.013-0.016 in. (0.33-0.40mm).
- If all valve clearances are within specification, install all related parts as necessary.
If adjustment is necessary, adjust valve clearance while engine is cold by removing adjusting shim. Determine replacement adjusting shim size using formula. Using a micrometer determine thickness of removed shim. Calculate thickness of new adjusting shim so valve clearance comes within specified valves. R = thickness of removed shim, N = thickness of new shim, M = measured valve clearance.
INTAKE: N = R + (M 0.0138 in. [0.35mm])
- Shims are available in 37 sizes (thickness is stamped on shim _ this side always installed down), select new shims with thickness as close as possible to calculated value.