Service Manual

Marine Vibration Isolator ISB, ISBe and QSB (Common Rail [...]
Page 16-54 Section 16 - Mounting Adaptations - Group 16
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Check that the metal parts of the isolator are not
damaged, cracked, bent, or warped. If they are, the
isolator will need to be replaced.
Check for excessive corrosion. If corrosion is enough to
weaken the structure or impede the function of the
isolator, it will need to be replaced.
If an isolator is damaged or worn and less than one year
old, check that the isolator part number is correct for the
engine.
Check that the isolator mounting base is parallel with the
engine crankshaft centerline and that the stud is
perpendicular to the base, when looking from the side of
the engine. The oil pan flange can be used as a visual
reference. The engine support brackets must also be
parallel.
The alignment of the isolator base to the crank centerline
should be within four degrees of parallel.
The alignment of the isolator stud to the base should be
within four degrees of perpendicular.
Check that the isolator mounting base is parallel to the
transverse crankshaft centerline and that the stud is
perpendicular to the base when looking from the front or
back of the engine. The engine support brackets must
also be parallel.
The alignment of the isolator base to the transverse
crankshaft centerline should be within two degrees of
parallel.
The alignment of the isolator stud to the base should be
within two degrees of perpendicular.
Check that the isolator mounting base is parallel to the
crankshaft centerline when looking from the top of the
engine.
The alignment of the isolator base to the crankshaft
centerline should be within two degrees of parallel.