Mercury 200 OptiMax Jet Drive, Service Manual, Page: 75 / 391

Jet Installation
Page 1D-32 90-8M0050731 MAY 2011
7. Ensure that the hose slopes at a minimum rate of 25 mm (1 in.) drop per 30 mm (12 in.) of hose.
a - Water bypass hose
b - Hose clamp
c - Through‑the‑hull fitting
Installing the Exhaust System
General Exhaust System Notes
IMPORTANT: Failure to follow current marine industry guidelines (NMMA, ABYC, U.S. Coast Guard, etc.) when installing
aftermarket mufflers can result in product damage. Secure all mufflers according to current marine industry standards to prevent
movement during engine operation.
•
Exhaust system application must meet ABYC standard P‑1 for marine exhaust installations.
• The entire exhaust system must meet 1309.99 kPa (190 psi) burst pressure.
• All rubberized exhaust system components must meet SAE J‑2006 standards for marine exhaust hoses.
• The mufflers and exhaust hoses must be adequately supported for proper orientation and to prevent overstressing the exhaust
components. The support requirements will vary with exhaust system design and the amount of G‑forces to be encountered.
• Rubber hose should be connected to pipes with flares or beads or barbs to prevent the hose from sliding off the pipe under
pressure.
Measuring the Exhaust Outlet
1. Fill all fuel, oil, and water tanks to maximum capacity.
2. Add the maximum allowable cargo weight to the boat in areas where it will be stored.
3. Add 86 kg (190 lb) in all locations where each passenger will sit during normal operation.
4. Using the diagrams below, measure to ensure location of muffler outlets.
5. Move the load weight and cargo weight to the stern of the boat to simulate the greatest stern down attitude the boat will
encounter, such as when loading.
6. Check the muffler outlet measurements.
7. Check the exhaust system slope to ensure 5° downhill slope.
b
a
c
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