Inspect the Center Bolt
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| Illustration 1 | g00992208 |
(1) Locknut (2) Adjustable assembly (A) Clearance above the adjustable assembly | |
Inspect the tightness of locknut (1) on the center bolt. Use a minimum torque of 220 N·m (162 lb ft).
If the locknut is loose, perform the following Steps:
- Tighten the locknut to 220 N·m (162 lb ft).
- Measure clearance (A) above adjustable assembly (2) .
- Compare the clearance to the specification from the engine commissioning. The clearance and the specification from the engine commissioning must be equal.
Any difference in the clearance indicates that the height of the isolator has changed. A change in the height of the isolator will result in misalignment between the engine and the driven equipment.
Adjusting the Height Of the Engine Support Assembly
Note: When shims are used in order to maintain the height of the engine support assembly, the alignment of the engine and the driven equipment must be verified.
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| Illustration 2 | g00992217 |
(1) Jacking screw (2) Setscrew (3) Shim | |
- Loosen setscrews (2) .
- Raise the engine with jacking screw (1) .
- Add or remove shims (3), if necessary. Tighten set screws (2) .
Maintain a record of all of the shims that are added and/or removed from each isolator. When any of the following conditions occur the isolators must be rebuilt or replaced:
- There is more than 5 mm (0.2 inch) of difference between dimension (B) and the dimension that is stamped on the mounting foot of the engine.
- Clearance (A) from illustration 1 can not be adjusted to the required height.
For a standard rotation engine, the specification for clearance (A) for the left side isolators is 9.5 mm (0.4 inch). The specification for clearance (A) for the right side isolators is 4.5 mm (0.2 inch).
For a reverse rotation engine, the specification for clearance (A) for the left side isolators is 4.5 mm (0.2 inch). The specification for clearance (A) for the right side isolators is 9.5 mm (0.4 inch).
Note: If the isolators are repaired or replaced the engine must be realigned with the driven equipment. The new heights of the engine mounts must be stamped on the mounting feet. A copy of the new specifications must be added to the report from the engine commissioning and/or ship's documents.
For the proper adjustment, refer to the shipyard's installation manual.