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.
Air Induction System
An air crossover housing is located on top of the engine over the injection pump. It is bolted to the intake manifold with 4 bolts and serves as the only air inlet in the system. No fuel passes through the crossover. It is an open-chambered housing with a single inlet drawing air through an air filter assembly mounted above. The crossover unit has two branches, one leading to each side of the intake manifold. Gaskets are installed between crossover and manifold to prevent vacuum leaks. Federal and California models use different crossovers to accommodate specific EGR systems. Starter fluid should NEVER be used or sprayed into crossover. If crossover is removed, air screens must be installed.
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.
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