REMOVAL & INSTALLATION
EXCEPT PREMIER AND MONACO
See Figures 1 through 9
Position the engine so that the No. 1 cylinder is at TDC of its compression stroke as follows:
- Remove the front rocker arm cover.
- Turn the engine over until the timing mark on the crankshaft damper is lined up with the timing indicator on the engine.
- Both No. 1 cylinder valves should be completely closed (both springs will be at their highest position).
- If one of the valve springs is still compressed even slightly, turn the crankshaft 360° until the timing marks line up again.
- Disconnect the negative battery cable.
- Remove the timing covers from the engine by following the previous procedures in this section.
- If the same timing belt will be reused, mark the direction of the timing belt's rotation for installation in the same direction. Make sure the engine is positioned so the No. 1 cylinder is at the TDC of its compression stroke and the sprockets timing marks are aligned with the engine's timing mark indicators.
- Loosen the timing belt tensioner bolt and remove the belt. If not removing the tensioner, position it as far away from the center of the engine as possible and tighten the bolt.
- If the tensioner is being removed, paint a stripe on the outside of the spring to ensure it is not installed backwards. Unbolt the tensioner and remove it along with the spring.
- Hold the camshaft sprocket steady to keep it from rotating with Spanner Tool MB990775 or equivalent. Loosen and remove the bolt and washer.
- Remove the camshaft sprockets from the end of the camshaft.
- Place the camshaft sprocket on the end of the camshaft. Make sure the sprocket and camshaft grooves line up.
- Install the bolt and washer to the camshaft. Use the spanner tool to hold the sprocket from rotating while tightening the bolt to 70 ft. lbs. (95 Nm).
- Install the tensioner (if removed), and hook the upper end of the spring to the water pump pin and the lower end to the tensioner in exactly the same position as when removed. Turn the timing belt tensioner counterclockwise full travel in the adjustment slot and tighten the bolt to temporarily hold this position.
- If not already done, position both camshafts so the marks align with those on the alternator bracket (rear bank) and inner timing cover (front bank). Rotate the crankshaft so the timing mark aligns with the mark on the oil pump.
- Install the timing belt on the crankshaft sprocket and while keeping the belt tight on the tension side (front side), install the belt on the front (radiator side) camshaft sprocket.
- Install the belt under the water pump pulley, over the rear camshaft sprocket, then to the inside of the tensioner, keeping the belt taught the entire time. Any slack should be only in the section where the timing belt adjuster is located, if any slack is between any other two pulleys the timing belt will not function correctly.
- Rotate the front camshaft counterclockwise to tension the belt between the front camshaft and the crankshaft. If the timing marks came out of line, repeat the procedure. The timing marks must line up when the belt is fully tensioned.
- Install the crankshaft sprocket flange.
- Loosen the tensioner bolt and allow the spring to tension the belt.
- Turn the crankshaft 2 full turns in the clockwise direction only until the timing marks are aligned again and tighten the tensioner lock bolt to 19 ft. lbs. (25 Nm).
Turn the crankshaft slowly and in the clockwise direction ONLY.
- Install the timing belt covers, the engine bracket, the insulator, the crankshaft pulleys, accessories and accessory drive belts.
- Install the rocker arm cover if removed to find top dead center for the No. 1 cylinder.
- Connect the negative battery cable and road test the vehicle.