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.
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HOMESERVICE MANUALSOLDSMOBILE1987CALAIS BASE, 2D COUPE, 2.5 U, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL2.5L 4-CYL - VINS [R,U]REMOVAL & INSTALLATIONPISTON & ROD ASSEMBLYINSTALLATION
1987 Oldsmobile Calais Base, 2D Coupe, 2.5 U, Automatic
Piston & Rod Assembly: Installation
1987 Oldsmobile Calais Base, 2D Coupe, 2.5 U, AutomaticSECTION Installation
- Check fit of new piston and/or rings in cylinder bore before assembling piston and pin to connecting rod. Check piston pin for clearance, etching or wear. New pistons must be installed in the cylinder for which they were fitted. Install used pistons in the cylinder from which they were removed.
- Lightly oil piston rings and cylinder walls. Verify ring gaps are properly spaced and install ring compressor on piston. Marked side of compression rings must be toward top of piston. Position piston so that identification numbers on rod and cap are on same side. See Fig 1.
- Install Connecting Rod Bolt Guide Set (J-6305-11) or rubber sleeves before installing piston and rod assembly in bore. Tap gently with wooden handle to insert piston/rod assembly into cylinder bore.
- After bearings have been inserted, apply engine oil to journals and bearings. Ensure oil hole in bearing insert aligns with oil hole in connecting rod. Turn crankshaft to bottom of its stroke. Guide piston/rod assembly over crankshaft journal until rod bearing seats.
- Remove rod bolt protectors. Match rod cap to rod and install. Tighten cap nuts in two steps. Repeat procedure for each piston assembly. After piston/rod assembly is installed, check side clearance of connecting rod on each crankshaft journal.
RENDER: 1.0x
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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.