Crankshaft Inspection - Mazda 2006-2008 RX7 Engine Workshop Manual

4. Insert the piston ring into the cylinder by hand and
use the piston to push it to the bottom of the ring
travel.
5. Measure each piston ring end gap with a feeler
gauge.
• If it exceeds the specification, replace the
piston, piston pin, piston ring and connecting
rod as a single unit.
Piston end gap (Standard)
Top: 0.16—0.31 mm {0.0063—0.0122 in}
Second: 0.33—0.48 mm {0.0130—0.0189 in}
Oil (rail): 0.20—0.70 mm {0.0079—0.0275 in}
Piston end gap (Maximum)
1.0 mm {0.0393 in}
End Of Sie

CRANKSHAFT INSPECTION

1. Install the main bearing cap. (See 01–10–28 Main Bearing Cap Assembly Note.)
2. Measure the crankshaft end play.
• If it exceeds the specification, replace the
thrust bearing or crankshaft so that the
specified end play is obtained.
Crankshaft end play (Standard)
0.22—0.45 mm {0.0087—0.0177 in}
Crankshaft end play (Maximum)
0.55 mm {0.0216 in}
3. Remove the main bearing cap. (See 01–10–11
Main Bearing Cap Disassembly Note.)
4. Measure the crankshaft runout.
• If it exceeds the specification, replace the
crankshaft.
Crankshaft runout (Maximum)
0.05 mm {0.0019 in}
5. Measure the journal diameter in X and Y
directions at the two points (A and B) as indicated
in the figure.
• If it exceeds the specification, replace the
crankshaft or grind the journal and install the
undersize bearing.
Main journal bearing size
STD: 51.980—52.000 mm {2.0464—2.0472
in}
US0.25: 51.730—51.750 mm {2.0366—2.0373
in}
Main journal out of round (Maximum)
0.05 mm {0.0019 in}
Crank pin journal diameter [LF]
STD: 46.980—47.000 mm {1.8497—1.8503
in}
US0.25: 46.730—46.750 mm {1.8398—1.8405
in}
Crank pin journal diameter [L3]
STD: 49.980—50.000 mm {1.9677—1.9685 in}
US0.25: 49.730—49.750 mm {1.9579—1.9586 in}
Crank pin out of round (Maximum)
0.05 mm {0.0019 in}
MECHANICAL
A
PISTON RING
E5U011011301E01
B
X
Y
01–10–19
01–10
B3E0110E082
B3E0110E083
AME2224E311
B3E0110E085