• Parts for engines manufactured in Mexico and Hiroshima cannot be used interchangeably as the engine will not operate correctly resulting in a serious malfunction. To prevent this, when replacing parts refer to the 'SPECIFICATION IDENTIFICATION' table below and verify the engine's place of manufacture before performing the servicing. (See
SPECIFICATION IDENTIFICATION)
• If the crankshaft and the cylinder block are replaced with a type B from a type A as shown in the figure, replace the crankshaft and cylinder block with a type B at the same time. Otherwise, the engine could be damaged.
1.Install the main bearing caps in the order indicated in the figure, using the SST (49 D032 316).
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Tightening torque (Screw thread length 94 mm {3.7 in})
1. 3.0—7.0 N·m {31—71 kgf·cm, 27—61 in·lbf}
2. 23—27 N·m {2.4—2.7 kgf·m, 17—19 ft·lbf}
3. 87.5—92.5°
Tightening torque (Screw thread length 45 mm {1.8 in})
1. 3.0—7.0 N·m {31—71 kgf·cm, 27—61 in·lbf}
2. 23—27 N·m {2.4—2.7 kgf·m, 17—19 ft·lbf}
3. 38—42 N·m {3.9—4.2 kgf·m, 29—30 ft·lbf}
4. Loosen the all bolts
5. 3.0—7.0 N·m {31—71 kgf·cm, 27—61 in·lbf}
6. 18—22 N·m {1.9—2.2 kgf·m, 14—16 ft·lbf}
7. 87.5—92.5°
Piston Pin Assembly Note
1.Assemble the piston pin so that the front marks of the piston and the connecting rod are positioned on the same surface.
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Piston Ring Assembly Note
1.Install the two oil control ring segments and spacer.
2.Verify that the second ring is installed with scraper face side downward.
3.Verify that the top ring is installed with chamfered face side inner of upper.
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4.Position the end gap of each ring as indicated in the figure.
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Connecting Rod Bearing Assembly Note
1.Install the connecting rod bearing to the connecting rod and connecting rod caps, as shown in the figure.
With positioning tab
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Without positioning tab
Caution
• There shall be no positioning tab for the connecting rod bearing. When installing the bearing, measure the position of the bearing so that the position is centered on the connecting rod and the bearing cap, and the install it.
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Piston Assembly Note
1.Insert the piston and connecting rod into the cylinder with the arrow mark to front of the engine.
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Connecting Rod Cap Assembly Note
1.Tighten the connecting rod bolts in two steps using the SST (49 D032 316).
Tightening torque
1. 26—32 N·m {2.7—3.2 kgf·m, 20—23 ft·lbf}
2. 80—100°
Balancer Unit Assembly Note
Caution
• The balancer unit cannot be disassembled due to the precision interior construction of the balancer unit.
1.Visually inspect the balancer unit gear for damage and verify that the shaft rotates smoothly.
• If there is any malfunction, replace the balancer unit.
2.Remove the cylinder block lower blind plug and install the SST.
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3.Rotate the crankshaft in the direction of engine rotation so that the No. 1 cylinder is at top dead center (TDC). (Until the counterweight contacts the SST and stops.)
Note
• If the cylinder block, crankshaft, crankshaft main bearing, and balancer unit are not replaced, use the adjustment shim as it is. In this case, go to Step 12.
4.Assemble the master shims (No. 50) to the shim seating face of the balancer unit at the angles shown in the figure.
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Caution
• Engage the gears slowly and place the balancer unit on the cylinder block while being careful not to contact the balancer unit gear strongly with the crankshaft drive gear and damage it.
5.With the balancer unit marks at the exact top center positions, assemble the balancer unit to the cylinder block and tighten the bolts in a criss-cross pattern in two steps.
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Tightening torque
1. 25 N·m {2.5 kgf·m, 18 ft·lbt}
2. 39—45 N·m {4.0—4.5 kgf·m, 29—33 ft·lbf}
6.Remove the SST installed in Step 2.
7.Measure the gear backlash using the following procedure.
(1) Place the ATDC marks 10 °, 30 °, 100 °, 190 °, 210 °, 280 ° on the rear side of the crankshaft to indicate the angles.
(2)Insert a flathead screwdriver into the crankshaft No.1 counterweight area and set both the rotation and the thrust direction with the flathead screwdriver, using a prying action, as shown in the figure for accurate measurement of the backlash.
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(3)Set the SST and a dial gauge as shown in the figure.
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(4)Rotate the driven gear to the left and right so that the crankshaft drive gear and balancer unit gear contact each other lightly.
(5)When measuring the backlash, rotate the crankshaft one full rotation and measure the backlash at 6 locations (A to F) as shown in the figure.
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8.Select the adjustment shim from the selection table based on the measured minimum value of the backlash.
Adjustment shim selection table
Measured backlash
mm {IN.EN_UK}
Selection shim (No.)
Shim thickness mm {IN.EN_UK}
Measured backlash
mm {IN.EN_UK}
Selection shim (No.)
Shim thickness mm {IN.EN_UK}
0.267—0.273 {0.01051—0.01074}
15
1.15 {0.0452}
0.127—0.133 {0.00500—0.00523}
35
1.35 {0.0531}
0.260—0.266 {0.01023—0.01047}
16
1.16 {0.0456}
0.120—0.126 {0.00472—0.00496}
36
1.36 {0.0535}
0.253—0.259 {0.00996—0.01019}
17
1.17 {0.0460}
0.113—0.119 {0.00444—0.00468}
37
1.37 {0.0539}
0.246—0.252 {0.00968—0.00992}
18
1.18 {0.0464}
0.106—0.112 {0.00417—0.00440}
38
1.38{0.0543}
0.239—0.245 {0.00940—0.00964}
19
1.19 {0.0468}
0.099—0.105 {0.00389—0.00413}
39
1.39 {0.0547}
0.232—0.238 {0.00913—0.00937}
20
1.20 {0.0472}
0.092—0.098 {0.00362—0.00385}
40
1.40 {0.0551}
0.225—0.231 {0.00885—0.00909}
21
1.21 {0.0476}
0.085—0.091 {0.00334—0.00358}
41
1.41 {0.0555}
0.218—0.224 {0.00858—0.00881}
22
1.22 {0.0480}
0.078—0.084 {0.00307—0.00330}
42
1.42 {0.0559}
0.211—0.217 {0.00830—0.00854}
23
1.23 {0.0484}
0.071—0.077 {0.00279—0.00303}
43
1.43 {0.0562}
0.204—0.210 {0.00803—0.00826}
24
1.24 {0.0488}
0.064—0.070 {0.00251—0.00275}
44
1.44 {0.0566}
0.197—0.203 {0.00775—0.00799}
25
1.25 {0.492}
0.057—0.063 {0.00224—0.00248}
45
1.45 {0.0570}
0.190—0.196 {0.00748—0.00771}
26
1.26 {0.496}
0.050—0.056 {0.00196—0.00220}
46
1.46 {0.0574}
0.183—0.189 {0.00720—0.00744}
27
1.27 {0.499}
0.043—0.049 {0.00169—0.00192}
47
1.47 {0.0578}
0.176—0.182 {0.00692—0.00716}
28
1.28 {0.503}
0.036—0.042 {0.00141—0.00165}
48
1.48 {0.0582}
0.169—0.175 {0.00665—0.00688}
29
1.29 {0.507}
0.029—0.035 {0.00114—0.00137}
49
1.49 {0.0586}
0.162—0.168 {0.00637—0.00661}
30
1.30 {0.511}
0.022—0.028 {0.000866—0.00110}
50 (master shim)
1.50 {0.0590}
0.155—0.161 {0.00610—0.00633}
31
1.31 {0.515}
0.015—0.021 {0.00059—0.000826}
51
1.51 {0.0594}
0.148—0.154 {0.00582—0.00606}
32
1.32 {0.519}
0.008—0.014 {0.000314—0.000551}
52
1.52 {0.0598}
0.141—0.147 {0.00555—0.00578}
33
1.33 {0.523}
0.001—0.007 {0.00003—0.000275}
53
1.53 {0.0602}
0.134—0.140 {0.00527—0.00551}
34
1.34 {0.527}
0.000—0.000 {0.000—0.000}
54
1.54 {0.0606}
9.Verify that the No. 1 cylinder is at TDC.
• If not aligned, perform Steps 2—3.
10.Remove the master shim from the balancer unit and assemble the selected adjustment shim at the angles shown in the figure.
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11.Perform Steps 5—7.
12.Verify that the measured backlash is within the specified range.
• If the backlash exceeds the maximum specification, replace the adjustment shim and repeat Steps 4—12.
Measured backlash maximum
0.01—0.10 mm {0.001—0.003 In}
Pilot Bearing Assembly Note
1.Assemble the pilot bearing using the corresponding 20 mm {0.79 in} side of a Snap-on brand millimeter size bushing driver set A160M adapter A160M7 (20—22 mm {0.79—0.86 in}).
