Acura RL. Manual - part 467

Fig. 32: Checking Top Of Engine Block For Warpage
Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Calculate the difference between cylinder bore diameter and piston diameter. If the clearance is near

or exceeds the service limit, inspect the piston and engine block for excessive wear.

Piston-to-Block Clearance

Standard (New): 0.015-0.040 mm (0.0006-0.0016 in.)

Service Limit: 0.08 mm (0.003 in.)

Fig. 33: Identifying Difference Between Cylinder Bore Diameter And Piston Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

Friday, June 05, 2009 3:16:24 PM

Page 22

CYLINDER BORE HONING

1. Measure the cylinder bores (see step 4 ). If the engine block is to be reused, hone the cylinders and

remeasure the bores. Only scored or scratched cylinder bores must be honed.

2. Remove and discard the oil jets (see OIL JET REPLACEMENT ).

3. Hone the cylinder bores with honing oil and a fine (400 grit) stone in a 60 degree Crosshatch pattern.

4. When honing is complete, thoroughly clean the engine block of all metal particles. Wash the cylinder

bores with hot soapy water, then dry and oil them immediately to prevent rusting. Never use solvent,
it will only redistribute the grit on the cylinder walls.

5. If scoring or scratches are still present in the cylinder bores after honing to the service limit, rebore the

engine block. Some light vertical scoring and scratching is acceptable if it is not deep enough to catch
your fingernail and does not run the full length of the bore.

6. Install the new oil jets (see OIL JET REPLACEMENT ).

PISTON, PIN, AND CONNECTING ROD REPLACEMENT

DISASSEMBLY

1. Remove the piston from the engine block (see CRANKSHAFT AND PISTON REMOVAL ).

2. Apply new engine oil to the piston pin snap rings (A) and turn them in the ring grooves until the end

gaps are lined up with the cutouts in the piston pin bores (B).

NOTE:



Use only a rigid hone with 400 grit or finer stone, such as Sunnen,
Ammco, or equivalent.



Do not use stones that are worn or broken.

Fig. 34: [Identifying 60 Degree Crosshatch Pattern In Cylinder
Bore]
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE:

Take care not to damage the ring grooves.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

Friday, June 05, 2009 3:16:24 PM

Page 23

Fig. 35: Identifying Piston Pin Snap Rings
Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Remove snap rings (A) from both sides of the piston. Start at the cutout in the piston pin bore.

Remove the snap rings carefully so they do not go flying or get lost. Wear eye protection.

Fig. 36: Removing Snap Rings
Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Heat the piston and connecting rod assembly to about 158°F (70°C), then remove the piston pin.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

Friday, June 05, 2009 3:16:24 PM

Page 24

Fig. 37: Heating Piston And Connecting Rod Assembly
Courtesy of AMERICAN HONDA MOTOR CO., INC.

INSPECTION

1. Measure the diameter of the piston pin.

Piston Pin Diameter

Standard (New): 21.962-21.965 mm (0.8646-0.8648 in.)

Service Limit: 21.954 mm (0.8643 in.)

Fig. 38: Measuring Diameter Of Piston Pin
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Zero the dial indicator to the piston pin diameter.

NOTE:

Inspect the piston, piston pin, and connecting rod when they are at room
temperature.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

Friday, June 05, 2009 3:16:24 PM

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