Timing Belt: Service and Repair
RemovalFig. 40 Timing belt replacement (Part 1 of 2). 1993-94 2.4L/4-143.5 engine:
Fig. 40 Timing belt replacement (Part 2 of 2). 1993-94 2.4L/4-143.5 engine:
Remove timing belt in numbered sequence shown in Fig. 40, noting the following:
1. Remove engine mount bracket as outlined under Engine Mount, Replacement.
Fig. 19 Aligning timing marks. 1993-96 2.4L/4-143.5 engine:
2. Turn crankshaft clockwise and align timing marks to position No. 1 cylinder on its compression stroke at TDC, Fig. 19.
3. Remove the auto tensioner.
4. Mark belt rotating direction on belt.
5. Tie camshaft sprocket and timing belt with a cord so that the position of the camshaft sprocket will not move with respect to the timing belt.
6. Using spanner wrench tool Nos. MB990767 and MD998719 or equivalents, remove camshaft sprocket nut and sprocket.
7. Remove oil pump sprocket as follows:
Fig. 41 Locking silent shaft. 1993-94 2.4L/4-143.5 engine:
a. Remove plug on side of engine block, Fig. 41.
b. Insert a Phillips screwdriver into hole to block the left silent shaft. If the screwdriver will only go in .79-.98 inch as it strikes against the counterbalance shaft, turn the sprocket once, realign the timing mark and check that the screwdriver goes in 2.36 inches or more. The screwdriver should not be taken out until the timing belt is installed.
c. Remove oil pump sprocket nut then the sprocket.
8. Mark rotational direction on timing belt B prior to removal.
Installation
Fig. 40 Timing belt replacement (Part 1 of 2). 1993-94 2.4L/4-143.5 engine:
Install timing belt in numbered sequence shown in Fig. 40, noting the following:
Fig. 42 Sealing support bracket bolt. 1993-94 2.4L/4-143.5 engine:
1. Apply sealant to engine support bracket bolt as shown in Fig. 42.
Fig. 43 Crankshaft sprocket B installation. 1993-94 2.4L/4-143.5 engine:
2. Install crankshaft sprocket B as shown in Fig. 43.
3. Install right silent shaft sprocket spacer with chamfered edge pointed toward the oil seal.
4. Ensure crankshaft sprocket B and the silent shaft sprocket timing marks are aligned then install timing belt B.
5. Adjust timing belt B tension as follows:
a. Temporarily install timing belt B tensioner to that center of tensioner is to the left and above the installation bolt.
b. Place tension on timing belt B so tension side of belt is tight then tighten tensioner bolt.
Fig. 44 Checking timing belt B tension. 1993-94 2.4L/4-143.5 engine:
c. At the point marked ``A'' and ensure belt is within .20-.28 inch when depressed for correct tension, Fig. 44.
Fig. 45 Crankshaft flange & sprocket installation. 1993-94 2.4L/4-143.5 engine:
6. Install crankshaft flange and pulley as shown in Fig. 45.
7. Install auto tensioner as follows:
a. Keeping auto tensioner level clamp it in a soft jawed vise. If plug at bottom of tensioner protrudes, surround it with a washer to prevent the plug from being in direct contact with the vise.
Fig. 46 Aligning tensioner set holes. 1993-94 2.4L/4-143.5 engine:
b. Push in the rod slowly with vise until set holes are aligned, Fig. 46.
c. Insert a wire .055 inch in diameter into set holes and unclamp tensioner from vise.
d. Install tensioner keeping wire installed in set holes.
8. Install tensioner pulley onto tensioner arm. Position the pinhole in tensioner pulley shaft to the left of the center bolt, then tighten center bolt finger tight.
Fig. 41 Locking silent shaft. 1993-94 2.4L/4-143.5 engine:
9. Ensure timing marks are aligned and remove plug on side of engine block, Fig. 41. Insert a Phillips screwdriver into hole to block the left silent shaft.
10. If screwdriver cannot be inserted 2.4 inch or more turn the oil pump sprocket one turn and realign timing marks. Ensure screwdriver can be inserted 2.4 inches or more. Screwdriver should not be removed until installation of the timing belt is complete.
11. Install timing belt as follows:
a. Install timing belt around tensioner pulley and crankshaft sprocket and secure timing belt onto tensioner pulley with your left hand.
b. Pulling timing belt with your right hand, install it around the oil pump sprocket.
c. Install belt around idler pulley.
d. Install belt around camshaft sprocket.
Fig. 47 Positioning timing belt tension pulley. 1993-94 2.4L/4-143.5 engine:
e. Gently raise tensioner pulley so that belt does not sag then temporarily tighten center bolt, Fig. 47.
12. Adjust timing belt tension as follows:
a. Remove screwdriver and install plug in side of cylinder block.
b. Turn crankshaft 90° (1/4 turn) counterclockwise.
c. Turn crankshaft back to position No. 1 cylinder at TDC.
Fig. 48 Tightening timing belt tension. 1993-94 2.4L/4-143.5 engine:
d. Loosen tensioner pulley center bolt, then attach socket wrench tool No. MD998752 or equivalent and a torque wrench and apply 1.88-2.03 ft. lbs, Fig. 48.
e. Holding tensioner pulley with special tool, tighten center bolt to specification.
Fig. 49 Installing setscrew tool:
f. Install setscrew tool No. MD998738 or equivalent, into engine left support bracket until its end makes contact with tensioner arm, Fig. 49.
g. Turn setscrew tool to increase the pressure on the tensioner arm then remove wire from tensioner set holes.
h. Rotate crankshaft two complete turns clockwise and allow to sit for 15 minutes.
i. After 15 minutes, measure auto tensioner rod protrusion, and verify that it is within the .15-.18 inch specification. If not as specified, repeat steps a through h.
j. Install rubber plug to the timing belt rear cover.
Fig. 50 Timing belt cover installation 1993-94 2.4L/4-143.5 engine:
13. Install timing belt cover screws into proper location as shown in Fig. 50.