Acura CSX. Instruction — page 58

01

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Out-of-Round and Taper

Journal Out-of-Round
Standard (New): 0.005 mm (0.0002 in.) max.
Service Limit:

0.010 mm (0.0004 in.)

Journal Taper
Standard (New): 0.005 mm (0.0002 in.) max.
Service Limit:

0.010 mm (0.0004 in.)

Straightness

Crankshaft Total Runout
Standard (New): 0.03 mm (0.0012 in.) max.
Service Limit:

0.04 mm (0.0016 in.)

7-15

Crankshaft Inspection

1. Remove the crankshaft from the engine block

(see page 7-13).

2. Clean the crankshaft oil passages with pipe

cleaners or suitable brush.

3. Clean the keyway and the threads, and check for

damage.

4. Measure the out-of-round at the middle of each rod

and main journal in two places. The difference
between measurements on each journal must not
be more than the service limit.

5. Measure the taper at the edges of each rod and the

main journal. The difference between
measurement on each journal must not be more
than the service limit.

6. Place the V-blocks on a flat surface.

7. Check the total runout with the crankshaft

supported on V-blocks.

8. Measure the runout on all main journals. Rotate the

crankshaft two complete revolutions. The
difference between measurements on each journal
must not be more than the service limit.

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02

03

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Piston Skirt Diameter
Standard (New):
No Letter (or A):

85.980

85.990 mm

(3.3850

3.3854 in.)

B:

85.970

85.980 mm

(3.3846

3.3850 in.)

Service Limit:
No Letter (or A):

85.930 mm (3.3831 in.)

B:

85.920 mm (3.3827 in.)

Oversize Piston Skirt Diameter
0.25: 86.230

86.240 mm (3.3949

3.3953 in.)

Cylinder Bore Size
Standard (New):
A or I:

86.010

86.020 mm

(3.3862

3.3866 in.)

B or II:

86.000

86.010 mm

(3.3858

3.3862 in.)

Service Limit:

86.070 mm (3.3886 in.)

Oversize Bore
0.25: 86.250

86.260 mm (3.3957

3.3961 in.)

Reboring Limit: 0.25 mm (0.01 in.) max.

Bore Taper
Limit: (Difference between first and third

measurement) 0.05 mm (0.002 in.)

7-16

Engine Block

Block and Piston Inspection

PISTON SKIRT DIAMETER

11 mm
(0.4 in.)

6 mm (0.2 in.)

6 mm (0.2 in.)

X

Y

No. 4

No. 1

First Measurement

Second Measurement

Third Measurement

1. Remove the crankshaft and the pistons (see page

7-13).

2. Check the piston for distortion or cracks.

3. Measure the piston skirt diameter at a point 11 mm

(0.4 in.) from the bottom of the skirt. There are two
standard-size pistons (No Letter or A, and B). The
letter is stamped on the top of the piston. Letters
are also stamped on the engine block as the
cylinder bore sizes.

4. Measure the wear and taper in direction X and Y at

three levels inside each cylinder as shown. If the
measurements in any cylinder are beyond the
Oversize Bore Service Limit, replace the engine
block. If the engine block is being rebored, refer to
step 7 after reboring.

04

05

06

Engine Block Warpage
Standard (New): 0.07 mm (0.003 in.) max.
Service Limit:

0.10 mm (0.004 in.)

Piston-to-Cylinder Bore Clearance
Standard (New): 0.020

0.040 mm

(0.0008

0.0016 in.)

Service Limit:

0.05 mm (0.002 in.)

7-17

PRECISION STRAIGHT EDGE

SERVICE LIMIT
0.05 mm (0.002 in.)

5. Scored or scratched cylinder bores must be honed.

6. Check the top of the engine block for warpage.

Measure along the edges, and across the center as
shown.

7. Calculate the difference between the cylinder bore

diameter and the piston diameter. If the clearance
is near, or exceeds the service limit, inspect the
piston and the cylinder bore for excessive wear.

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02

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Disassembly

7-18

7-18

Engine Block

Cylinder Bore Honing

Piston, Pin, and Connecting Rod
Replacement

A

60 °

A

B

A

Only a scored or scratched cylinder bore must be honed.

1. Measure the cylinder bores (see page 7-16).

If the engine block is to be reused, hone the
cylinders, and remeasure the bores.

2. K20Z3 engine: Remove the oil jets (see page 8-13).

3. Hone the cylinder bores with honing oil and a fine

(400 grit) stone in a 60 degree cross-hatch pattern
(A). 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.

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 the engine block 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. K20Z3 engine: Install the oil jets (see page 8-13).

1. Remove the piston from the engine block (see page

7-13).

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: Take care not to damage the ring grooves.

3. Remove both snap rings (A). 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.

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