Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Subaru Outback F6-3.0L DOHCFACTORY OEM SERVICE PROCEDURE
Piston, Engine
PISTON AND PISTON PIN
Piston grade point H 37.3 mm (1.4685 inch)
Piston outer diameter
Standard
A 89.205 - 89.215 mm (3.5120 - 3.5124 inch)
B 89.195 - 89.205 mm (3.5116 - 3.5120 inch)
0.25 mm (0.0098 inch) oversize 89.445 - 89.465 mm (3.5215 - 3.5222 inch)
0.50 mm (0.0197 inch) oversize 89.695 - 89.715 mm (3.5313 - 3.5321 inch)
Cylinder to piston clearance, standard -0.010 - 0.010 mm (-0.0004 - 0.0004 inch)
Clearance between pin & pin hole, standard 0.004 - 0.008 mm (0.0002 - 0.0003 inch)
PISTON RING
Piston ring gap, standard
Top ring 0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Second ring 0.35 - 0.50 mm (0.0138 - 0.0197 inch)
Oil ring rail 0.20 - 0.60 mm (0.0079 - 0.0236 inch)
Clearance between ring & ring groove
Top ring 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Second ring 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Clearance between oil ring & groove 0.045 - 0.125 mm (0.0018 - 0.0049 inch)
Piston grade point H 37.3 mm (1.4685 inch)
Piston outer diameter
Standard
A 89.205 - 89.215 mm (3.5120 - 3.5124 inch)
B 89.195 - 89.205 mm (3.5116 - 3.5120 inch)
0.25 mm (0.0098 inch) oversize 89.445 - 89.465 mm (3.5215 - 3.5222 inch)
0.50 mm (0.0197 inch) oversize 89.695 - 89.715 mm (3.5313 - 3.5321 inch)
Cylinder to piston clearance, standard -0.010 - 0.010 mm (-0.0004 - 0.0004 inch)
Clearance between pin & pin hole, standard 0.004 - 0.008 mm (0.0002 - 0.0003 inch)
PISTON RING
Piston ring gap, standard
Top ring 0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Second ring 0.35 - 0.50 mm (0.0138 - 0.0197 inch)
Oil ring rail 0.20 - 0.60 mm (0.0079 - 0.0236 inch)
Clearance between ring & ring groove
Top ring 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Second ring 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Clearance between oil ring & groove 0.045 - 0.125 mm (0.0018 - 0.0049 inch)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.