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.
Description & Operation
During idle and low speeds, crankcase gases travel from the oil trap, (at base of oil filler neck), through connecting hose to cylinder valve cover between cylinders 1 and 2. Gases pass through another oil trap (inside valve cover), into a restrictor (inside elbow on valve cover), through connecting hose to the intake air distributor.
A safety valve, installed in oil filler neck, opens at pressure of 80 to 100 mbar to guide the crankcase gas direct to the air guide housing.
At high speeds, crankcase gases pass through a restrictor (at top of oil filler neck), to mix with fuel tank gases through a connecting hose into the intake air distributor.
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.