Oil Jet Valve Inspection; Piston Inspection - Mazda 2006-2008 RX7 Engine Workshop Manual

OIL JET VALVE INSPECTION

1. Apply compressed air to oil jet valve A and verify
that air passes through oil jet valve B.
• If air does not flow, replace the oil jet valve.
Oil jet valve air pressure
216—274 kPa {2.2—2.7 kgf·cm
psi}
End Of Sie

PISTON INSPECTION

Caution
• The piston and connecting rod cannot be disassembled.
• When replacing the piston, piston pin, piston ring and connecting rod, replace them together as a
single unit.
1. Measure the outer diameter of each piston at right
angle 90° to the piston pin, 10.0 mm {0.40 in}
above the under of the piston.
• If not within the specification, replace the
piston, piston pin, piston ring and connecting
rod as a single unit.
Piston diameter (Standard)
87.465—87.495 mm {3.4435—3.4446 in}
2. Measure the piston-to-cylinder clearance.
• If not within the specification, replace the
piston, piston pin, piston ring and connecting
rod as a single unit.
Piston-to-cylinder clearance (Standard)
0.025—0.045 mm {0.0010—0.0017 in}
Piston-to-cylinder clearance (Maximum)
0.11 mm {0.0043 in}
3. Measure the piston ring-to-ring groove clearance around the entire circumference.
• If it exceeds the specification, replace the piston, piston pin, piston ring and connecting rod as a single unit.
Piston ring-to-ring groove clearance
(Standard)
Top: 0.03—0.08 mm {0.0012—0.0031 in}
Second: 0.03—0.07 mm {0.0012—0.0027 in}
Oil: 0.03—0.07 mm {0.0012—0.0027 in}
Piston ring-to-ring groove clearance
(Maximum)
Top: 0.17 mm {0.0067 in}
Second, Oil: 0.15 mm {0.0059 in}
01–10–18
MECHANICAL
2
31.4—39.7
E5U011010730E01
B
A
B3E0110E079
E5U011011010E01
B3E0110E080
B3E0110E081