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Acura RL. Manual - part 463

CRANKSHAFT MAIN BEARING REPLACEMENT

MAIN BEARING CLEARANCE INSPECTION

1. Remove the main caps and bearing halves (see CRANKSHAFT AND PISTON REMOVAL ).

2. Clean each main journal and bearing half with a clean shop towel.

3. Place one strip of plastigage across each main journal.

4. Reinstall the bearings and caps, then torque the bearing cap bolts to 74 N.m (7.5 kgf.m, 54 lbf.ft), and

the bearing cap side bolts to 49 N.m (5.0 kgf.m, 36 lbf.ft) in the proper sequence (see step 21 ).

5. Remove the cap and bearing half, and measure the widest part of the plastigage.

Main Bearing-to-Journal Oil Clearance

'05-06 models:

Standard (New): 0.020-0.044 mm

(0.0008-0.0017 in.)

Service Limit: 0.050 mm (0.0020 in.)

'07-08 models:

Standard (New): 0.019-0.045 mm

(0.0007-0.0018 in.)

Service Limit: 0.050 mm (0.0020 in.)

NOTE:

If the engine is still in the vehicle when you bolt the main cap down to
check the clearance, the weight of the crankshaft and drive plate will
flatten the plastigage further than just the torque on the cap bolt, and
give you an incorrect reading. For an accurate reading, support the
crank with a jack under the counterweights, and check only one
bearing at a time.

NOTE:

Do not rotate the crankshaft during inspection.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

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

Page 6

Fig. 7: Measuring Main Bearing-To-Journal Oil Clearance
Courtesy of AMERICAN HONDA MOTOR CO., INC.

6. If the plastigage measures too wide or too narrow, remove the crankshaft, and remove the upper half

of the bearing. Install a new, complete bearing with the same color code, and recheck the clearance.
Do not file, shim, or scrape the bearings or the caps to adjust clearance.

7. If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color

listed above or below current one), and check again. If the proper clearance cannot be obtained by
using the appropriate larger or smaller bearings, replace the crankshaft and start over.

MAIN BEARING SELECTION

Crankshaft Bore Code Location

Letters or bars have been stamped on the end of the block as a code for the size of each of the four main
journal bores.

Use them, and the numbers stamped on the crankshaft (codes for main journal size), to choose the correct
bearings. If the codes are indecipherable because of an accumulation of dirt and dust, do not scrub them with
a wire brush or scraper. Clean them only with solvent or detergent.

Fig. 8: Identifying Crankshaft Bore Code Location
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 7

Fig. 9: Main Bearing Selection Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Main journal code locations (Numbers or Bars)

Fig. 10: Identifying Main Journal Code Locations
Courtesy of AMERICAN HONDA MOTOR CO., INC.

CONNECTING ROD BEARING REPLACEMENT

ROD BEARING CLEARANCE INSPECTION

1. Remove the connecting rod cap and bearing half (see CRANKSHAFT AND PISTON

REMOVAL ).

2. Clean the crankshaft rod journal and bearing half with a clean shop towel.

3. Place a strip of plastigage across the rod journal.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

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

Page 8

4. Reinstall the bearing half and cap, and torque the bolts.

Tightening Torque

20 N.m (2.0 kgf.m, 14 lbf.ft) +90°

Apply new engine oil to the bolt threads.

5. Remove the rod cap and bearing half and measure the widest part of the plastigage.

Connecting Rod Bearing-to-Journal Oil Clearance

Standard (New): 0.020-0.044 mm (0.0008-0.0017 in.)

Service Limit: 0.050 mm (0.0020 in.)

Fig. 11: Measuring Connecting Rod Bearing-To-Journal Oil Clearance
Courtesy of AMERICAN HONDA MOTOR CO., INC.

6. If the plastigage measures too wide or too narrow, remove the upper half of the bearing, then install a

new, complete bearing with the same color code, and recheck the clearance. Do not file, shim, or
scrape the bearings or the caps to adjust clearance.

7. If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color

listed above or below current one), and check clearance again. If the proper clearance cannot be
obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.

ROD BEARING SELECTION

Each rod falls into one of four tolerance ranges (from 0 to 0.024 mm (0.0009 in.), in 0.006 mm (0.0002 in.)
increments) depending on the size of its big end bore. It's then stamped with a number or bar (1,2,3, or 4/I,
II, III, or IIII) indicating the range. You may find any combination of 1,2,3, or 4/I, II, III, or IIII in any
engine.

Normal Bore Size: 58.0 mm (2.28 in.)

Inspect the connecting rod for cracks and heat damage.

NOTE:

Do not rotate the crankshaft during inspection.

2007 Acura RL

2005-08 ENGINE Engine Block - RL

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

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