Fitting
Exhaust Pipe
Welding
T ip Cleaner
If particles are inside screen, replace fitting
Inspect Orifice
Flow
Exhaust Pipe
Orifice
Orifice Specifications:
All 700 Models: .055in. (1.4mm)
All 777 DIt Models: .055in. (1.4mm)
All 1200 Models: 0.090in. (2.3mm)
Maintenance
2.16
Engine -- Continued
Exhaust Coolin g Orifice/Screen Cleaning
The exhaust pipe rubber hoses and muffler are cooled by injecting a small amount of water through an orifice from
the main cooling system into the exhaust stream. The orifice and screen should be inspected and cleaned periodically
to ensure proper cooling of the exhaust muffler and connector hoses. Be sure hoses are not restricted (kinked or
collapsed internally).
CAUTION:
Do not enlarge the orifice or a decrease in performance will result.
1. Loosen clamp connecting hose to fitting and remove line.
2. Using a deep well 9/16² socket or flare nut wrench, remove fitting from exhaust manifold. Inspect fitting for
debris or restriction and clean if necessary.
3. Inspect and clean orifice and screen.
4. Apply pipe thread sealant to threads of fitting and re-install. Tighten securely.
5. Re-install air bypass hose and tighten clamp.
NOTE: *Refer to Preventative Maintenance Schedule on Pages 2.2 and 2.3.
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