For an exploded view of the crankshaft and main bearings, see Figure 31837 .
1. Damper Retaining Plate
11. Connecting Rod Bearings
2. Woodruff Key
12. Thrust Bearing
3. Vibration Damper
13. Flywheel Ring Gear
4. Front Wear Liner
14. Flywheel
5. Seal Washer
15. Rear Oil Seal
6. Oil Pump Drive Spline
16. Crankshaft-to-Flexplate Adaptor
7. Crankshaft Gear
17. Flywheel Adaptor
8. Roll Pin
18. Flexplate (Automatic Transmission)
9. Crankshaft
19. Reinforcing Ring
10. Crankshaft Rod Bearings
20. Flywheel Mounting Bolt
Exploded View of Crankshaft and Main Bearings
For an exploded view of the crankcase and related parts, see Figure 31869 .
1. Oil Inlet Tube Support Bracket
17. O-ring
2. Main Front and Intermediate Bearing Caps
18. Rear Oil Seal Carrier
3. Cup Plug, 15.8 mm (5/8 in.)
19. Plug, Pipe Hex Socket 1/8 in. NPT
4. Oil Jet Cooling Tube
20. Plug, Pipe Sq. Socket 1/2 in. NPTF
5. Crankcase
21. Plug, Pipe Hex Head NPTF
6. Cup Plug, 32 mm (1-1/4 in.)
22. Bolt
7. Cylinder Liner (Sleeve)
23. Oil Filler Tube Bracket
8. Camshaft Bearing Set
24. Oil Filler Tube Clamp
9. Cylinder Head Alignment Dowel
25. Oil Filler Tube
10. Plug, Pipe Hex Head 1/4 in. NPFT
26. Oil Level Gage Tube Seal
11. Plug, Pipe Hex Socket 1/8 in. NPT
27. Oil Level Gage
12. Cylinder Sleeve Shim (Service Only)
28. Oil Filter Tube Clamp
13. Cylinder Sleeve Seal Rings
29. Oil Level Gage Lower Tube
14. Gasket
30. Main Rear Bearing Cap Thrust
15. Cap Plug, 20.6 mm (13/16 in.)
31. Main Bearing Cap Mounting Bolt
16. Main Bearing Cap Mounting Bolt
Exploded View of Crankcase and Related Parts
To determine if repair is possible or replacement is necessary, perform the following procedure. See Figure 25360 .
Crankshaft Repair or Replacement Flowchart
To determine if repair is possible or replacement is necessary, perform the following procedure. See Figure 21696 .
Crankshaft Main Bearing Shells Repair or Replacement Flowchart
Remove the crankshaft and main bearings as follows:
Note: Prior to bearing cap removal, check to see that caps and crankcase are stamped to identify location. If they are not marked, stamp in numerical order 1-7, starting with No. 1 at the front of the engine. Stamp the crankcase oil pan rail and main bearing caps on the camshaft side. See Figure 31970 . The stamping is a No. 7 in the illustration.
Bearing Cap Removal
Loosen Cap Bolts
Remove Cap
1. Mounting Bolt
3. Crankcase
2. Main Bearing Cap
4. Screwdriver
Loosen Thrust Bearing Mounting Bolts
Note: Only use hand pressure when twisting the screwdriver.
Crankshaft Removal
Note: Ensure the crankshaft is not damaged during the removal procedure.
Bearing Shell Removal
Perform the following steps to inspect and repair the vibration damper.
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To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure. |
Note: Inspect the rubber insert for swelling, separation, or cracking which may indicate possible failure.
Perform the following steps:
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To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure. |
Note: Do not scrape gum or varnish deposits from the bearing shells.
Journal Measurement
Note: If journals exceed maximum out-of-round specification, crankshaft must be reground.
Note: An induction hardened fillet and journal crankshaft can be reground similar to any precision crankshaft. However, these shafts require special treatment when grinding. Before grinding all crankshafts must be checked for hardness.
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The hardness test is destructive and is only made prior to grinding the crankshaft. The grinding process will correct the damage made by the Rockwell hardness tester. Do not test for hardness unless the crankshaft is to be reground. |
Note: The top and bottom are determined with the crankshaft journal at TDC.
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Superior strength of the fillet-hardened crankshaft is due to the special process by which the bearing surfaces and fillets are hardened. This localized hardening greatly increases the bending strength of the crankshaft. In order to maintain this strength, precautions must be taken when re-grinding the crankshaft. The metallurgical characteristics of the shaft demand exacting standards and control when re-grinding journals. It can be reground locally where equipment and experience can produce quality standards outlined in these instructions. |
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Use every precaution to avoid burns on the shaft during the grinding operation. |
Note: Do not grind the crankshaft flange.
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To avoid injury from fire, keep a fire extinguisher near the grinding machine in case excessive heat should ignite the oil. |
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To avoid injury from the acrid fumes and the potential for fire from the acetone cleaner, etch in a well-ventilated area, away from any open flames, sparks, and electrical resistance heating elements. |
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To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure. |
Note: If the crankshaft has been burned, it will show up as a change of color after the etch. Areas hardened by excessive heat appear nearly white, while softened areas turn dark gray or black; areas unaffected by the heat of grinding etch a light gray.
Note: If any burns show up after the etch is used, the physical properties of the crankshaft will have been seriously reduced, and the crankshaft should not be used.
Note: If burning becomes a serious problem, it can usually be eliminated by reducing the indeed rate, using a softer grade of wheel, or increasing the work spindle speed. Sometimes, a combination of these factors, along with the recommendations mentioned above, will be necessary to overcome the problem.
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Thoroughly clean crankshaft oil passages with nylon bristle brush, soap and water to remove all debris which may have accumulated during re-grinding procedure. Any debris left in crankshaft oil passages cannot be removed by oil filters and will damage bearings immediately upon engine start-up. Once cleaned, wrap crankshaft, to protect it from contamination, until it is installed. |