Nissan Sentra Service Manual: Vacuum lines

Exploded View

1. Clamp
2. Vacuum hose (built-in check valve)
3. Vacuum piping
4. Vacuum hose

1. To intake manifold side
2. Paint mark
3. Stamp indicating engine direction
4. To brake booster

Removal and Installation

REMOVAL

1. Remove air duct and air cleaner case. Refer to EM-25, "Removal and Installation".
2. Remove the vacuum hoses and vacuum piping.

INSPECTION AFTER REMOVAL

Visual Inspection

Check for correct installation, damage and deterioration of the vacuum hoses and pipe.

Valve Air-tightness Check

• Connect a suitable tool at each end of the vacuum hose with built-in check valve to inspect the check valve operation.

Vacuum applied at booster end : Refer to BR-54, "Check Valve".

Vacuum applied at intake manifold end : Refer to BR-54, "Check Valve".

• Replace the vacuum hose with built-in check valve if out of specification.

INSTALLATION

Installation is in the reverse order of removal.

• When installing vacuum hose, insert it until its tip reaches the back-end of length (A) or further as shown.

CAUTION:

Do not use lubricating oil during assembly

Length (A) : 24 mm (0.95 in) or more

• Face the paint mark of vacuum hose (build-in check valve) (intake manifold side) to vehicle right side to assemble.
• Face the paint mark of vacuum hose (build-in check valve) (brake booster side) to vehicle front side to assemble.
• Face the paint mark of vacuum piping (intake manifold side) to vehicle front side to assemble.
• Face the paint mark of vacuum piping (brake booster side) to downward to assemble.
• Face the paint mark of vacuum hose (intake manifold side) to downward to assemble.
• Face the paint mark of vacuum hose (brake booster side) to vehicle front side to assemble.
• For clamp mounting direction (the orientation of pawl), refer to BR-36, "Exploded View".

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