B3.9 and B5.9 Series Engines
Air Leaks, Air Intake and Exhaust Systems (010-024)
Section 10 - Air Intake System - Group 10
Assemble the intake piping, and connect the cold starting
aid (if equipped).
Initial Check (010-024-001)
Engine intake air must be filtered to prevent dirt and
debris from entering the engine. If intake air piping is
damaged or loose, unfiltered air will enter the engine
and cause premature wear.
Inspect the intake air piping for cracked hoses, damage, or
Replace damaged pipes, and tighten loose clamps, as
necessary, to make sure the air intake system does not
Check for corrosion of the intake system piping under the
clamps and hoses. Corrosion can allow corrosive products
and dirt to enter the intake system. Disassemble and clean,
Operate the engine at high idle, and use a solution of soapy
water to spot intake air leaks.
If an air leak exists, the soap bubbles will be drawn in with