Engine Block Cleaning and Inspection - LE5 or LE9
Special Tools
• | EN-8087 Cylinder Bore Gauge |
• | GE-7872 Magnetic Base Dial Indicator |
For equivalent regional tools, refer to
Special Tools : LE5 or LE9 .
- Clean the sealing material from the gasket mating surfaces (2) with a suitable tool (1).
- Clean the engine block and lower crankcase in a cleaning tank with solvent appropriate for aluminum.
- Flush the engine block with clean water or steam.
- Clean the oil passages.
- Clean the blind holes.
- Spray the cylinder bores and the machined surfaces with engine oil.
- Inspect the threaded holes. Clean the threaded holes with a rifle brush. If necessary, drill out the holes and install thread inserts. Refer to
Thread Repair : LE5 or LE9 .
Note: Do not attempt to machine the lower crankcase to engine block surfaces.
- Use a straight edge (1) and a feeler gauge (2) to check the deck surface for flatness. Carefully machine minor irregularities. Replace the block if more than 0.254 mm (0.010 in) must be removed.
- Inspect the oil pan rail for nicks. Inspect the front cover attaching area for nicks. Use a flat mill file to remove any nicks.
- Clean the sealing material from the gasket mating surfaces on the lower crankcase engine block side with a suitable tool (1).
- Clean the sealing material from the gasket mating surfaces on the lower crankcase oil pan side with a suitable tool (1).
- Inspect the mating surfaces of the transmission face.
Caution: A broken flywheel may result if the transmission case mating surface is not flat.
- Use the following procedure in order to measure the engine block flange runout at the mounting bolt hole bosses:
13.1. | Temporarily install the crankshaft and upper bearings. Measure the crankshaft flange runout using the GE-7872 dial indicator (1) |
13.2. | Hold the gage plate flat against the crankshaft flange. |
13.3. | Place the dial indicator stem on the transmission mounting bolt hole boss. Set the indicator to 0. |
13.4. | Record the readings obtained from all of the bolt hole bosses. The measurements should not vary more than 0.203 mm (0.008 in). |
13.5. | Recheck the crankshaft flange runout if the readings vary more than 0.203 mm (0.008 in). |
13.6. | Remove the crankshaft and bearings. |
- Install the bed plate and bolts. Tighten the bed plate bolts to specification.
- Inspect the crankshaft main bearing bores. Use the EN-8087 gauge (1) to measure the bearing bore concentricity and alignment. Refer to Engine Mechanical Specifications : LE5 or LE9 .
- Replace the engine block and bed plate if the crankshaft bearing bores are out of specification.
- Remove the bed plate.
- Inspect the cylinder bores using the EN-8087 gauge (1). Inspect for the following items:
- If the cylinder bores are out of specification, install a NEW cylinder bore sleeve. Refer to
Cylinder Sleeve Removal : LE5 or LE9 and Cylinder Sleeve Installation : LE5 or LE9 .
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