Acura RSX Honda Integra. Manual — part 58
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01
02
S6M6A00A18360245611KBAT00
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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:
K20A3 Engine:
Standard (New): 0.40
0.55 mm (0.016
0.022 in.)
Service Limit:
0.70 mm (0.028 in.)
K20A2, K20Z1 Engines:
Standard (New): 0.50
0.65 mm (0.020
0.026 in.)
Service Limit:
0.75 mm (0.030 in.)
Oil Ring:
K20A3 Engine:
Standard (New): 0.25
0.65 mm (0.010
0.026 in.)
Service Limit:
0.75 mm (0.030 in.)
K20A2, K20Z1 Engines:
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
B
A
A
B
15
20 mm (0.6
0.8 in.)
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. Do not use a wire brush to clean the
ring grooves, 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.
4. Using a piston, 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 over the service limit, the engine
block must be rebored.
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04
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Top Ring Clearance
K20A3 Engine:
Standard (New): 0.035
0.060 mm
(0.0014
0.0024 in.)
Service Limit:
0.13 mm (0.005 in.)
K20A2, K20Z1 Engines:
Standard (New): 0.040
0.065 mm
(0.0016
0.0026 in.)
Service Limit:
0.13 mm (0.005 in.)
Second Ring Clearance
K20A3 Engine:
Standard (New): 0.030
0.055 mm
(0.0012
0.0022 in.)
Service Limit:
0.13 mm (0.005 in.)
K20A2, K20Z1 Engines:
Standard (New): 0.045
0.070 mm
(0.0018
0.0028 in.)
Service Limit:
0.13 mm (0.005 in.)
7-23
A
B
C
A
B
TOP RING (STANDARD):
A: 3.1 mm (0.12 in.)
B: 1.2 mm (0.05 in.)
SECOND RING (STANDARD):
K20A3 engine:
A: 2.8 mm (0.11 in.)
B: 1.2 mm (0.05 in.)
PISTON RING DIMENSIONS:
K20A3
engine
A
B
K20A3
engine
K20A2, K20Z1
engines
K20A2, K20Z1
engines
C
K20A2, K20Z1 engines:
A: 3.4 mm (0.13 in.)
B: 1.2 mm (0.05 in.)
OIL RING GAP
About 90 °
SECOND RING GAP
PISTON PIN
OIL RING GAP
About 45 °
TOP RING GAP and
SPACER RING GAP
6. Install the top ring and second ring as shown. The
top ring (A) has a T1 or R1 mark and the second
ring (B) has a T2 or R2 mark. The manufacturing
marks (C) must be facing upward.
7. Rotate the rings in their grooves to make sure they
do not bind.
8. Position the ring end gaps as shown:
9. After installing a new set of rings, measure the
ring-to-groove clearances:
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S6M6A00A18360200000KCAT00
If the Crankshaft is Already Installed
Tightening Torque
K20A3 Engine:
20 N·m (2.0 kgf·m, 14 lbf·ft)
K20A2, K20Z1 Engines: 29 N·m (3.0 kgf·m, 22 lbf·ft)
7-24
Engine Block
Piston Installation
A
A
B
90 °
1. Set the crankshaft to bottom dead center (BDC) for
each cylinder.
2. Apply new engine oil to the piston, inside of the
ring compressor, and the cylinder bore.
3. Attach the ring compressor to the piston/
connecting rod assembly, and check that the
bearing is securely in place.
4. Position the piston/connecting rod assembly with
the arrow (A) facing the timing belt side of the
engine.
5. Position the piston connecting rod assembly in the
cylinder, and tap it in using the wooden handle of a
hammer (A).
Maintain downward force 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-crank journal
alignment before pushing the piston into place.
7. Check the connecting rod bearing clearance with
plastigage (see page 7-8).
8. Inspect the connecting rod bolts (see page 7-25).
9. Apply engine oil to the bolt threads, then install the
rod caps with bearings. Tighten the connecting rod
bolts.
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.
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S6M6A00A18316217202MAAT01
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If the Crankshaft is Not Installed
Point A
Point B = Difference in Diameter
Difference in Diameter:
Specification: 0
0.1 mm (0
0.004 in.)
7-25
7-25
Connecting Rod Bolt Inspection
A
A
B
35 mm
(1.38 in.)
20 mm
(0.79 in.)
A
B
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 cylinder bore, then attach the
ring compressor to the piston/connecting rod
assembly.
3. Position the arrow (A) facing the cam chain side of
the engine.
4. Position the piston connecting rod assembly in the
cylinder, and tap it in using the wooden handle of a
hammer (A).
Maintain downward force on the ring compressor
(B) to prevent the rings from expanding before
entering the cylinder bore.
5. Position all pistons at top dead center.
1. Measure the diameter of each connecting rod bolt
at point A and point B.
2. Calculate the difference in diameter between point
A and point B.
3. If the difference in diameter is out-of-tolerance,
replace the connecting rod bolt.
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