2006 ACURA CSX lock

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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.)
7-16Engine Block
Block and Piston Inspection
PISTON SKIRT DIAMETER
11 mm
(0.4 in.) 6mm(0.2in.)
6mm(0.2in.)
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.
08/08/21 14:32:37 61SNR030_070_0016
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DYNOMITE -2009-



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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.
08/08/21 14:32:38 61SNR030_070_0017
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DYNOMITE -2009-


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Disassembly
7-187-18 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.
08/08/21 14:32:38 61SNR030_070_0018
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DYNOMITE -2009-




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Piston Pin-to-Piston Clearance
Standard (New): 0.005 to 0.002 mm
( 0.00020 to 0.00008 in.)
Service Limit: 0.005 mm (0.0002 in.)
Piston Pin-to-Connecting Rod Clearance
Standard (New): 0.005 0.015 mm (0.0002 0.0006 in.)
Service Limit: 0.02 mm (0.0008 in.)
Reassembly
7-20 Engine Block
Piston, Pin, and Connecting Rod Replacement (cont’d)
A
3. Check the difference between the piston pin
diameter and the piston pin hole diameter in the
piston.
4. Measure the piston pin-to-connecting rod clearance. 1. Install a piston pin snap ring (A) only on one side.
2. Coat the piston pin bore in the piston, the bore in
the connecting rod, and the piston pin with new
engine oil.
3. Heat the piston to about 70 °C (158 °F).
08/08/21 14:32:39 61SNR030_070_0020
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DYNOMITE -2009-

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7-217-21
Piston Ring Replacement
D C
F
E
B
A B
A
4. Assemble the piston (A) and the connecting rod (B)with the arrow (C) and the embossed mark (D) on
the same side. Install the piston pin (E).
5. Install the remaining snap ring (F).
6. Turn the snap rings in the ring grooves until the end gaps are positioned at the bottom of the piston. 1. Remove the piston from the engine block (see page
7-13).
2. Using a ring expander (A), remove the old piston rings (B).
3. Clean all ring grooves thoroughly with a squared- off broken ring or ring groove cleaner with a blade
to fit the piston grooves.
The top and 2nd ring grooves are 1.2 mm (0.05 in.)
wide. The oil ring groove is 2.0 mm (0.08 in.) wide.
File down a blade if necessary.
Donotuseawirebrushtocleantheringgrooves,
or cut the ring grooves deeper with the cleaning
tools.
NOTE: If the piston is to be separated from the
connecting rod, do not install new rings yet.
(cont’d)
This illustration shows K20Z2 engine.
08/08/21 14:33:06 61SNR030_070_0021
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7-217-21
Piston Ring Replacement
D C
F
E
B
A B
A
4. Assemble the piston (A) and the connecting rod (B)with the arrow (C) and the embossed mark (D) on
the same side. Install the piston pin (E).
5. Install the remaining snap ring (F).
6. Turn the snap rings in the ring grooves until the end gaps are positioned at the bottom of the piston. 1. Remove the piston from the engine block (see page
7-13).
2. Using a ring expander (A), remove the old piston rings (B).
3. Clean all ring grooves thoroughly with a squared- off broken ring or ring groove cleaner with a blade
to fit the piston grooves.
The top and 2nd ring grooves are 1.2 mm (0.05 in.)
wide. The oil ring groove is 2.0 mm (0.08 in.) wide.
File down a blade if necessary.
Donotuseawirebrushtocleantheringgrooves,
or cut the ring grooves deeper with the cleaning
tools.
NOTE: If the piston is to be separated from the
connecting rod, do not install new rings yet.
(cont’d)
This illustration shows K20Z2 engine.
08/08/21 14:33:06 61SNR030_070_0021
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DYNOMITE -2009-

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Piston Ring End-Gap
Top Ring:
Standard (New): 0.20 0.35 mm
(0.008 0.014 in.)
Service Limit: 0.60 mm (0.024 in.)
Second Ring:
K20Z2 engine:
Standard (New): 0.40 0.55 mm (0.016 0.022 in.)
Service Limit: 0.70 mm (0.028 in.)
K20Z3 engine:
Standard (New): 0.50 0.65 mm (0.020 0.026 in.)
Service Limit: 0.75 mm (0.030 in.)
Oil Ring:
Standard (New): 0.20 0.70 mm (0.008 0.028 in.)
Service Limit: 0.80 mm (0.031 in.)
7-22 Engine Block
Piston Ring Replacement (cont’d)
A
B 15 20 mm (0.6 0.8 in.) A
B
K20Z2 engine:
A
B
K20Z3 engine:
BTop Ring (Standard):
A: 3.1 mm (0.12 in.)
B: 1.2 mm (0.05 in.)
Second Ring (Standard):
A: 3.4 mm (0.13 in.)
B: 1.2 mm (0.05 in.)
Piston Ring Dimensions
A A
BC
C
4. Using a piston that has its rings removed, push a
new ring (A) into the cylinder bore 15 20 mm
(0.6 0.8 in.) from the bottom.
5. Measure the piston ring end-gap (B) with a feeler gauge:
 If the gap is too small, check to see if you have the proper rings for your engine.
 If the gap is too large, recheck the cylinder bore diameter against the wear limits (see page 7-16).
If the bore is beyond the service limit, the engine
block must be rebored. 6. Install the top ring and the second ring as shown.
The top ring (A) has a 1R mark, and the second ring
(B) has a 2R mark. The manufacturing marks (C)
must be facing upward.
08/08/21 14:33:07 61SNR030_070_0022
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DYNOMITE -2009-


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Top Ring Clearance
K20Z2 engine:
Standard (New): 0.035 0.060 mm
(0.0014 0.0024 in.)
Service Limit: 0.13 mm (0.005 in.)
K20Z3 engine:
Standard (New): 0.045 0.070 mm (0.0018 0.0028 in.)
Service Limit: 0.13 mm (0.005 in.)
Second Ring Clearance
K20Z2 engine:
Standard (New): 0.030 0.055 mm (0.0012 0.0022 in.)
Service Limit: 0.13 mm (0.005 in.)
K20Z3 engine:
Standard (New): 0.040 0.065 mm (0.0016 0.0026 in.)
Service Limit: 0.13 mm (0.005 in.)
If the Crankshaft is Already Installed
7-237-23
Piston Installation
OIL RING GAP About 90 °
SECOND RING GAP
PISTON PIN OIL RING GAPAbout 45 °
TOP RING GAP and
SPACER RING GAP A
A
B
7. After installing a new set of rings, measure the
ring-to-groove clearances:
8. Rotate the rings in their grooves to make sure they do not bind.
9. Position the ring end gaps as shown: 1. Set the crankshaft to bottom dead center (BDC) for
each cylinder as its piston is installed.
2. Remove the connecting rod caps, then install the ring compressor. Check that the bearing is securely
in place.
3. Apply new engine oil to the piston, inside of the ring compressor, and the cylinder bore, then attach
the ring compressor to the piston/connecting rod
assembly.
4. Position the mark (A) to face the cam chain side of the engine block.
5. Position the piston/connecting rod assembly in the cylinder, and tap it in using the wooden handle of a
hammer (A).
Push down on the ring compressor (B) to prevent
the rings from expanding before entering the
cylinder bore.
6. Stop after the ring compressor pops free, and check the connecting rod-to-rod journal alignment
before pushing the piston into place.
(cont’d)
This illustration shows K20Z2 engine.
08/08/21 14:33:08 61SNR030_070_0023
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DYNOMITE -2009-