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.
PCV System: Description
The crankcase ventilation system prevents the escape of blow-by gases into the atmosphere. The crankcase ventilation system for DL, GL, and Turbo models consists of an oil trap, flame guard (except Turbo models), PCV valve, and connecting hoses.
The system for 760 GLE models consists of a calibrated PCV orifice, flame guard, and connecting hoses to intake manifold and start injector.
Diesel models route crankcase gases from top of valve cover through a connecting hose to the air intake duct. The 760 GLE Turbo Diesel models use an oil separator valve mounted on top of valve cover and a connecting hose to the turbo air intake.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.