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.
1994 Geo Metro L3-61 1.0LFACTORY OEM SERVICE PROCEDURE
Piston Pin, Engine
Engine Liter/VIN 1.0L/6
All Measurements Given In Inches Unless Otherwise Specified
Piston Diameter (Std.) 2.9122-2.9130
Piston Clearance 0.0008-0.0015
Piston Pin Diameter [01]
Piston Ring End Gap [02]
Comp. 0.0079-0.0276
Oil 0.0079-0.0708
Piston Ring Side Clearance
Comp. [03]
[01] Pistons & pins are matched set & should be replaced as an assembly.
[02] Maximum.
[03] Top ring, 0.0012-0.0027 inch] 2nd ring, 0.0008-0.0023 inch.
All Measurements Given In Inches Unless Otherwise Specified
Piston Diameter (Std.) 2.9122-2.9130
Piston Clearance 0.0008-0.0015
Piston Pin Diameter [01]
Piston Ring End Gap [02]
Comp. 0.0079-0.0276
Oil 0.0079-0.0708
Piston Ring Side Clearance
Comp. [03]
[01] Pistons & pins are matched set & should be replaced as an assembly.
[02] Maximum.
[03] Top ring, 0.0012-0.0027 inch] 2nd ring, 0.0008-0.0023 inch.
Factory Service Tools
Use the Manual With the Right Hardware
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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.