The 1990 Acura Integra GS uses a 1.8-liter four-cylinder engine. Acura recommends changing the timing belt at or before 90,000 miles. The 1.8-liter engine is an interference engine, which means that should the timing belt stretch past the scope of the tensioner, the valves will most likely hit the pistons and cause extensive engine damage. It takes about three-and-one-half hours to replace the timing belt.
Tools Used: Set of wrenches, Floor jack, Jack stands, Lug wrench, Set of sockets, 6-inch block of 2-by-4-inch wood, Long screwdriver, 5 mm pins (for B18A1 and B18B1 engines), Torque wrench
Replace Timing Belt
Disconnect the negative battery cable and lay it to the side. Do not allow it to touch metal. Jack up the Integra with the floor jack, then support it with jack stands. Remove the left wheel using the lug wrench and the left splash guard using the appropriate socket.
Loosen the tensioner on the accessory drive belts. Lift the belts off the pulleys. Unbolt the power steering pump, but do not remove the hoses. Move the power steering pump to the side. Remove the valve cover using the appropriate socket.
Place the block of wood on the floor jack. Slide the floor jack under the oil pan and jack it up enough so that the wood touches the bottom of the engine to support the engine. Remove the left engine mount using the appropriate socket.
Number the spark plug wires so you know where they go when you put the Integra back together. The No. 1 cylinder is closest to the timing belt, and the cylinders are numbered 1-2-3-4. The firing order is 1-4-3-2. Stick the screwdriver in the first spark plug hole. Turn the crankshaft until you feel the screwdriver stop moving. The piston is at the top of the cylinder bore. Check the timing marks on the crankshaft and camshafts. The camshaft "up" marks must face up. The white crankshaft mark should be at the 11 o'clock position. If not, turn the crankshaft one more time, until you feel the screwdriver stop moving when the piston reaches the top of the cylinder bore again. This time, the marks will line up.
Remove the crankshaft pulley and the timing belt covers using the appropriate sockets. Loosen the timing belt tensioner bolt. Push the tensioner out of the way, then tighten it just enough to hold it out of the way. Lift the timing belt off the sprockets.
Install the lower timing belt cover and the crankshaft pulley. Check that the timing marks are still lined up. If your engine code is B18A1 or B18B1, move the camshafts (slightly, and only if necessary), and insert 5 mm pins vertically into the camshafts If your engine code is B18C1 or B18C5, you will see two camshaft timing marks. Both camshafts have a mark at the 12 o'clock position. The left camshaft sprocket (as you are looking down at the engine) has a second timing mark at the 3 o'clock position. The right camshaft has a second timing mark at the 9 o'clock position. Make sure all marks are aligned.
Remove the crankshaft pulley and the lower timing belt cover. Install the timing belt, working in a clockwise direction and starting on the crankshaft sprocket. Work your way up to the left camshaft, keeping the belt tight between the crankshaft and camshaft sprockets. Route the belt over the top of the right camshaft sprocket, over the front of the water pump pulley, then behind the tensioner pulley. Remove the 5 mm pins if you installed them.
Loosen the tensioner bolt. Allow the tensioner to put tension on the timing belt and retighten the bolt. Turn the crankshaft four to six turns counterclockwise, until the crankshaft timing mark and the timing marks at the 3 o'clock and 9 o'clock positions on the camshafts are lined up. Loosen the tensioner bolt again, allowing it to put more pressure on the timing belt.
Turn the crankshaft counterclockwise until three camshaft sprocket teeth rotate past the timing mark at the 12 o'clock position. Tighten the tensioner bolt to 40 foot-lbs. of torque. Install the rest of the parts in reverse order of removal. Tighten the crankshaft pulley bolt to 87 foot-lbs. of torque.
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