Acura CSX. Manual — part 60
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02
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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
A
B
15
20 mm (0.6
0.8 in.)
A
B
K20Z2 engine:
A
B
K20Z3 engine:
B
Top 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
B
C
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.
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SNR9A00A18360200000KCAT00
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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
7-23
7-23
Piston Installation
OIL RING GAP
About 90 °
SECOND RING GAP
PISTON PIN
OIL RING GAP
About 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.
This illustration shows K20Z2 engine.
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04
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02
SNR9A00A18360200000KCAT00
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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
7-23
7-23
Piston Installation
OIL RING GAP
About 90 °
SECOND RING GAP
PISTON PIN
OIL RING GAP
About 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.
This illustration shows K20Z2 engine.
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05
If the Crankshaft is Not Installed
7-24
Engine Block
90 °
A
A
B
7. Check the connecting rod bearing clearance with
plastigage (see page 7-8).
8. Inspect the connecting rod bolts (see page 7-25).
9. Install the rod caps with bearings. Tighten the bolts
to 20 N·m (2.0 kgf·m, 14 lbf·ft) (K20Z2 engine) or
29 N·m (3.0 kgf·m, 22 lbf·ft) (K20Z3 engine).
NOTE: Apply new engine oil to the bolt threads and
flanges.
10. Tighten the connecting rod bolts an additional 90 °.
NOTE: Remove the connecting rod bolt if you
tightened it beyond the specified angle, and go
back to step 8 of the procedure. Do not loosen it
back to the specified angle.
1. Remove the connecting rod caps, then install the
ring compressor, and check that the bearing is
securely in place.
2. 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.
3. Position the mark (A) to face the cam chain side of
the engine block.
4. 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.
5. Position all pistons at top dead center (TDC).
This illustration shows K20Z2 engine.
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