Crankshaft: Service and Repair

Crankshaft Replacement

Tools Required
* J 36972 or KM-635 Crankshaft Rear Oil Seal Installer
* J 45059 Angle Meter or
* KM-470-B Angular Torque Gage
* OTC 1726 (KM-412) Engine Overhaul Stand or equivalent

Disassembly Procedure





Caution: Refer to Safety Glasses Caution Safety Glasses Caution.

Notice: Use extreme care when installing the camshaft not to nick, scratch, or damage the camshaft lobes or bearing surfaces.

1. Remove the engine. Refer to Engine Replacement Removal and Replacement.
2. Remove the flywheel or the flexible plate bolts.
3. Remove the flywheel or the flexible plate.




4. Remove the crankshaft rear oil seal.
5. Mount the engine assembly on the OTC 1726 .




6. Remove the front timing belt cover bolts.
7. Remove the front timing belt cover.
8. Remove the crankshaft pulley bolts.
9. Remove the crankshaft pulley.




10. Loosen the timing belt automatic tensioner bolt.
11. Rotate the timing belt automatic tensioner hex-key clockwise to release the tension.
12. Remove the timing belt idler pulley bolt and nut.
13. Remove the timing belt idler pulleys.
14. Remove the timing belt.
15. Remove the engine mount retaining bolt.
16. Remove the engine mount.




17. Disconnect the crankcase breather tubes from the valve cover.
18. Remove the spark plug cover bolts.
19. Remove the spark plug cover.
20. Disconnect the ignition wires from the spark plugs.
21. Remove the valve cover bolts.
22. Remove the valve cover and the valve cover gasket.





Notice: Use extreme care when installing the camshaft not to nick, scratch, or damage the camshaft lobes or bearing surfaces.

23. While holding the intake camshaft firmly in place, remove the intake camshaft bolt.
24. Remove the intake camshaft gear.
25. While holding the exhaust camshaft firmly in place, remove the exhaust camshaft bolt.
26. Remove the exhaust camshaft gear.




27. Remove the crankshaft timing belt gear.




28. Remove the rear timing belt cover bolts and cover.




29. Rotate the engine on the OTC 1726 (1).




30. Remove the oil pan retaining bolts.
31. Remove the oil pan.
32. Remove the oil pump/pickup tube bolts.
33. Remove the oil pump/pickup tube.
34. Remove the lower block support bracket/splash shield bolts.
35. Remove the splash shield.
36. Remove the lower block support bracket bolts.
37. Remove the lower block support bracket.




38. Remove the oil pump retaining bolts.
39. Remove the oil pump.




40. Mark the order of the connecting rod bearing caps.
41. Remove the connecting rod bearing cap bolts for all of the pistons.
42. Remove the connecting rod bearing caps and the lower connecting rod bearings.




43. Mark the order of the crankshaft bearing caps.
44. Remove the crankshaft bearing cap bolts.
45. Remove the crankshaft bearing caps and the lower crankshaft bearings.
46. Remove the crankshaft.

Caution: Refer to Safety Glasses Caution Safety Glasses Caution.

47. Clean any necessary parts.

Assembly Procedure




1. Coat the crankshaft bearings with engine oil.
Notice: Refer to Fastener Notice Fastener Notice.

2. If replacing the crankshaft, transfer the pulse pickup sensor disc to the new crankshaft.

Tighten the pulse pickup sensor disc to 13 Nm (115 lb in).




3. Install the crankshaft.
4. Install the lower crankshaft bearings in the bearing caps.
5. Inspect the crankshaft end play with the crankshaft bearings installed.
6. Check for permissible crankshaft end play. Refer to Engine Mechanical Specifications Service Limits & General Specifications.




7. With the crankshaft mounted on the front and rear crankshaft bearings, check the middle crankshaft journal for permissible out-of-round, runout. Refer toEngine Mechanical Specifications Service Limits & General Specifications.





Important: Grease the crankshaft journals and lubricate the crankshaft bearings slightly so that the plastic gaging thread does not tear when the crankshaft bearing caps are removed.


8. Measure all of the crankshaft bearing clearances using a commercially available plastic gaging, ductile plastic threads.
9. Cut the plastic gaging threads (1) to the length of the bearing width. Lay them axially between the crankshaft journals and the crankshaft bearings.
10. Install the crankshaft bearing caps and the bolts.

Tighten the crankshaft bearing cap bolts to 50 Nm (37 lb ft). Using the J 45059 or the KM-470-B (1), tighten the bolt an additional turn of 45 degrees plus 15 degrees.




11. Remove the crankshaft bearing cap bolts and the caps.
12. Measure the width of the flattened plastic thread (1) of the plastic gaging using the scale printed on the plastic gaging package. Plastic gaging is available for different tolerance ranges.
13. Inspect the bearing clearance for permissible tolerance ranges. Refer to Engine Mechanical Specifications Service Limits & General Specifications.




14. Apply a bead of adhesive sealing compound to the grooves of the crankshaft bearing caps.
15. Install the crankshaft bearing caps to the engine block.
16. Tighten the crankshaft bearing caps using new bolts.

Tighten the crankshaft bearing cap bolts to 50 Nm (37 lb ft) using a torque wrench. Using the J 45059 or the KM-470-B (1) , tighten the bolts an additional turn of 45 degrees, plus another turn of 15 degrees.





Important: Grease the connecting rod journals and lubricate the connecting rod bearings slightly so that the plastic gaging thread does not tear when the connecting rod bearing caps are removed.


17. Measure all of the connecting rod bearing clearances using a commercially available plastic gaging, ductile plastic threads.
18. Cut the plastic gaging threads (1) to the length of the connecting rod bearing width. Lay them axially between the connecting rod journals and the connecting rod bearings.
19. Install the connecting rod bearing caps.

Tighten the connecting rod bearing cap bolts to 35 Nm (26 lb ft) using a torque wrench. Use the J 45059 or the KM-470-B to tighten the connecting rod bearing cap bolts to plus 45 degrees plus 15 degrees.




20. Remove the connecting rod bearing caps.
21. Measure the width of the flattened plastic thread (1) of the plastic gaging using the scale printed on the plastic gaging package. Plastic gaging is available for different tolerance ranges.
22. Inspect the bearing clearance for permissible tolerance ranges. Refer to Engine Mechanical Specifications Service Limits & General Specifications.




23. Install the connecting rod bearing caps to the connecting rods.
24. Tighten the connecting rod bearing caps using new bolts.

Tighten the connecting rod bearing cap bolts to 35 Nm (26 lb ft) using a torque wrench. Use the J 45059 or the KM-470-B (1) to tighten the connecting rod cap bolts plus 45 degrees plus 15 degrees.




25. Install the oil pump.
26. Install the oil pump retaining bolts.

Tighten the oil pump retaining bolts to 10 Nm (89 lb in).




27. Install engine block lower support bracket and the bolts.

Tighten the engine block lower support bracket bolts to 20 Nm (15 lb in) plus 45 degrees using the J 45059 or the KM-470-B .

28. Install the lower block support bracket splash shield and the bolts.

Tighten the lower block support bracket splash shield bolts to 35 Nm (26 lb ft).

29. Install the oil pump/pickup tube.
30. Install the oil pump/pickup tube bolts.

Tighten the oil pump/pickup tube bolts to 8 Nm (71 lb in).




31. Coat the new oil pan gasket with the sealant.
32. Install the oil pan gasket to the oil pan.
33. Install the oil pan.
34. Install the oil pan retaining bolts.

Tighten the oil pan retaining bolts to 10 Nm (89 lb in).




35. Rotate the engine on the OTC 1726 (1).




36. Install the rear timing belt cover.
37. Install the rear timing belt cover bolts.

Tighten the rear timing belt cover bolts to 7 Nm (62 lb in).

38. Install the crankshaft timing belt drive gear and the bolt.

Tighten the crankshaft timing belt drive gear bolt to 145 Nm (107 lb ft) plus 30 degrees plus 15 degrees using the J 45059 or theKM-470-B (1).

39. Install the engine mount and the retaining bolts.

Tighten the engine mount retaining bolts to 45 Nm (33 lb ft).




40. Install the timing belt automatic tensioner.
41. Install the timing belt automatic tensioner bolts.

Tighten the timing belt automatic tensioner bolts to 25 Nm (18 lb ft).

42. Install the timing belt idler pulley.
43. Install the timing belt idler pulley bolt and nut.

* Tighten the timing belt idler pulley bolt to 25 Nm (18 lb ft).
* Tighten the timing belt idler pulley nut to 25 Nm (18 lb ft).





Notice: Use extreme care when installing the camshaft not to nick, scratch, or damage the camshaft lobes or bearing surfaces.

44. Install the intake camshaft gear.
45. Install the intake camshaft gear bolt while holding the intake camshaft firmly in place.

Tighten the intake camshaft gear bolt to 50 Nm (37 lb ft) plus 60 degrees and 15 degrees.

46. Install the exhaust camshaft gear.
47. Install the exhaust camshaft gear bolt while holding the exhaust camshaft firmly in place.

Tighten the exhaust camshaft gear bolt to 50 Nm (37 lb ft) plus 60 degrees and 15 degrees.




48. Install the timing belt. Refer to Timing Belt Replacement Service and Repair.
49. Adjust the timing belt tension. Refer to Timing Belt Inspection 1. Timing Belt Inspection.
50. Apply a small amount of gasket sealant to the corners of the front camshaft caps and to the top of the rear valve cover to the cylinder head seal.
51. Install the valve cover and the valve cover gasket.
52. Install the valve cover bolts.

Tighten the valve cover bolts to 8 Nm (71 lb in).




53. Connect the ignition wires to the spark plugs.
54. Install the spark plug cover.
55. Install the spark plug cover bolts.

Tighten the spark plug cover bolts to 8 Nm (71 lb in).

56. Connect the crankcase breather tube to the valve cover.
57. Install the front timing belt cover.
58. Install the front timing belt cover bolts.

Tighten the front timing belt cover bolts to 8 Nm (71 lb in).

59. Install the engine lifting device.
60. Remove the engine from the OTC 1726 .




61. Install a new crankshaft rear oil seal using the J 36972 (1) or KM-635 .




62. Install the flywheel or flexible plate.
63. Install the flywheel or the flexible plate bolts.

Tighten the flywheel bolt to 65 Nm (48 lb ft). Use the J 45059 or the KM-470-B (1) to tighten the flywheel bolts another 30 degrees plus 15 degrees. For the automatic transaxle, tighten the flexible plate bolts to 45 Nm (33 lb ft).

64. Install the engine. Refer to Engine Replacement Removal and Replacement.