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4G63 Timing Belt Installation

The 4G63 is a four-cylinder 2.0-liter engine that Mitsubishi has manufactured since 1982. It appears in a variety of vehicles manufactured by Mitsubishi and Chrysler, especially during the 1990s. The Mitsubishi Eclipse made from 1990 to 1998 is a common vehicle that features the 4G63 engine. The timing belt in this engine allows the crankshaft to drive the camshaft, keeping the rotations of the camshaft and crankshaft synchronized so that the pistons fire at the correct time. A timing belt generally requires replacement after 60,000 miles.

Instructions

1

Remove the cable from the negative battery terminal with a socket wrench to ensure you dont start the engine accidentally. Disconnect the covers for the outer timing belt and remove the outer timing belt tensioner. Detach the outer timing belt from its sprockets.

2

Disconnect the outer flange and sprocket from the crankshaft with a socket wrench. Remove the spring for the inner timing belt tensioner from the water pump and disconnect the tensioner. Detach the inner timing belt from its sprockets.

3

Rotate the inner crankshaft sprocket to align the timing marks on the inner sprocket with the timing marks on the front of the crankcase. Install the new inner timing belt around the inner crankshaft sprocket so that the upper span of the timing belt is taut and the timing marks still align.

4

Connect the pulley for the inner timing belt pensioner and turn it by hand until the inner timing belt has a deflection of about 1/4 inch. Hold the pulley in place and tighten the mounting bolt for the inner timing belt pulley to 15 foot-pounds with a torque wrench.

5

Pull the inner timing belt tensioner toward the water pump as far as possible and fasten the mounting bolts for the tensioner with the socket wrench. Connect the spring for the inner timing belt tensioner to the water pump.

6

Remove the plug from the hole in the rear side of the cylinder block by the oil pump sprocket. Insert a tool with a diameter of 8mm into the hole to hold the oil pump sprocket in place.

7

Attach the outer crankshaft sprocket to the crankshaft with a socket wrench and align the timing marks on the crankshaft if necessary. Install the new outer timing belt to the outer crankshaft sprocket, oil pump sprocket and camshaft sprocket in that order. Ensure the outer timing belt is taut except on the outer timing belt tensioner.

8

Align the timing marks on the crankshaft if necessary. Loosen the mounting bolt for the outer timing belt tensioner, allowing the tensioner to apply tension to the outer timing belt. Remove the tool holding the oil pump shaft in place and turn the crankshaft clockwise to move the camshaft sprocket forward by two teeth to take up the slack in the timing belt.

9

Fasten the lower and upper mounting bolts for the outer timing belt tensioner in that order. Adjust the tensioner on the outer timing belt so that the deflection of the outer timing belt at its longest span is about 1/2 inch.

10

Replace the covers for the outer timing belt with a socket wrench. Connect the cable to the negative terminal of the battery.