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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 792 (ENGINE MECHANICAL - 3.1L UNIT REPAIR)REPAIR INSTRUCTIONSINTAKE MANIFOLD INSTALLATION - LOWER
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Intake Manifold Installation - Lower
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Intake Manifold Installation - Lower
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
When replacing intake manifold gasket, a revised intake manifold gasket has been introduced by manufacturer. This new design gasket helps resolve issues related to intake manifold oil/coolant leaks. The gasket requires a revised torque specification and procedure in addition to the use of NEW revised intake manifold bolts. Please review TSB ENGINE OIL OR COOLANT LEAK (INSTALL NEW INTAKE MANIFOLD GASKET)
for complete information.
- Apply sealer GM P/N United States 12378479, GM P/N Canada 10953472 or the equivalent at the engine block-to-lower intake manifold mating surface.
Ensure that the bead meets the following conditions:
- 2.0-3.0 mm (0.08-0.12 in) wide
- 3.0-5.0 mm (0.12-0.20 in) thick
- Install the lower intake manifold.
RENDER: 1.0x
NO RELATED
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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.