Mercury 250 Jet, Руководство по установке

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250 HP JET DRIVE INSTALLATION MANUAL
Page 40 90-10240040 DECEMBER 2003
Exhaust System Installation
General Exhaust System Notes
1. Exhaust system application must meet ABYC standard P-1 for marine exhaust
installations.
2. The entire exhaust system must meet 1309.99 kPa (190 p.s.i.) (1309.99 burst pressure.
3. All rubberized exhaust system components must meet SAE J-2006 standards for
marine exhaust hoses.
CAUTION
Mufflers must be secured in such a way as to prevent muffler movement during in-
advertent engine backfire. Movement of mufflers may result in exhaust hose loos-
ening which could cause boat sinking due to water intrusion.
4. 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.
5. Rubber hose should be connected to pipes with flares or beads or barbs to prevent the
hose from sliding off the pipe under pressure.
6. For additional exhaust system recommendations, see MERCURY spec. 90-884386
which covers all jet drive exhaust applications not covered under these guidelines.
Exhaust Outlet Measurement Procedure
1. Fill all fuel, oil and water tanks to maximum capacity.
2. Add maximum allowable cargo weight to boat in areas where it will be stored.
3. Add 86 kg (190 lbs) of weight in all locations where each passenger will sit during normal
operation.
4. Using diagrams provided (following), measure to ensure location of muffler outlets.
5. Move load weight and cargo weight to stern of boat to simulate greatest stern down atti-
tude the boat will encounter such as when loading.
6. Recheck muffler outlet measurements.
7. Check exhaust system slope to ensure 5
°
down hill slope.