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 MANUALSBUICK1998LESABRE V6-3.8L VIN KREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINESYSTEM SPECIFICATIONSFASTENER TIGHTENING SPECIFICATIONS - MAIN BEARING CAP
1998 Buick LeSabre V6-3.8L VIN K
Fastener Tightening Specifications - Main Bearing Cap
1998 Buick LeSabre V6-3.8L VIN KSECTION Fastener Tightening Specifications - Main Bearing Cap
Install the crankshaft main bearing caps. Use GM P/N 1052942 sealer at the number 4 crankshaft main bearing cap to the engine block surface.
Install the crankshaft main bearing cap bolts. Start the crankshaft main bearing cap bolts by hand. Ensure the bottom of the crankshaft main bearing cap is parallel to the bottom of the channel.
NOTICE: Refer to Permanently Stretching Bolt Notice in Service Precautions.
^ Tighten the crankshaft main bearing cap bolts in equal increments. Do not completely tighten one bolt at a time to prevent the cap from being cocked.
^ Tighten the bolts to 70 Nm (52 lb ft) to fully seat the crankshaft main bearing caps. Loosen the bolts 360 degrees counterclockwise.
^ Tighten the bolts to 20 Nm (15 lb ft), then 40 degrees (30 lb ft).
^ Use J36660 to tighten the bolts in steps: 35 degrees + 35 degrees + 40 degrees for a total of 110 degrees.
NOTICE: Refer to Fastener Notice in Service Precautions.
Install the side main bolts. Apply GM P/N 12345493 or equivalent to the side main bolts.
Tighten the side crankshaft main bearing cap bolts to 15 Nm (11 lb ft). Use J36660 to tighten the bolts an additional 45 degrees.
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.