Checking Vacuum Drop-Off - Mercury BRAVO Service Manual

SERVICE MANUAL NUMBER 28

Checking Vacuum Drop-Off

1. Connect a leak proof shut-off valve and pressure gauge between the Power Shift cylin-
2. With the engine running at idle, turn off the valve in the vacuum line. If the vacuum drops
90-863160 MAY 2000
der input flange and the vacuum connection at the engine manifold. Position the valve
toward the manifold side and the gauge toward the power shift cylinder.
a
a - Engine Manifold To Power Shift Cylinder Vacuum Hose
i
Locally Obtained Components
a - Vacuum Gauge
b - Coupling
c - T-fitting
d - Hose Barb Coupling
e - Hose Clamp
f - Short Vacuum Hose
g - Leak Proof Shut-off Valve
h - Coupling
i - Hose Barb
to "0" (zero) in less than 5 seconds in either test, install a gasket rebuild kit.
a. TEST1: With the cylinder piston in NEUTRAL.
b. TEST 2: With the cylinder piston in REVERSE.
a - Neutral
b - Reverse
a
g
b
e
d
c
h
ACCESSORIES - ALL MODELS
e
f
a b
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