Kohler 9EFOZ/10EOZ, 8.5EFOZ, 80EFOZ/99EOZ manual Exhaust System Location, Mounting, and Installation

4.3Exhaust System Location, Mounting, and Installation

Mount the silencer independently to eliminate stress on the exhaust system and the exhaust manifold/mixer elbow. See Section 7 for the mixer elbow water line hose size. See Figure 4-1 for the exhaust connection to the mixer elbow. Provide an adequate hose length from the exhaust mixer to the silencer to allow for generator set movement.

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1. Water/exhaust outlet	TP-5586-6

Figure 4-1 Mixer Elbow/Exhaust Connection, Typical

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TP-6134-

1. Water/exhaust outlet

Figure 4-2 Mixer Elbow/Exhaust Connection, 3.5EFOZ/4EOZ Model Only

Locate the exhaust outlet at least 10 cm (4 in.) above the waterline when the craft is loaded to maximum capacity. Install an exhaust port with the flap at the exhaust (transom) outlet to prevent water backup in following seas or when moving astern (backward). A lift in the exhaust piping before the piping exits the craft prevents backwash. See Figure 4-4, item 1. Support the exhaust lines to prevent the formation of water pockets.

Exhaust system installation guidelines for various generator set locations follow. Information and illustrations of stern- (rear) exhaust installations also apply to side-exhaust installations. Where exhaust lines require passage through bulkheads, use port (left)- or starboard (right)- side exhaust outlets, also in applications in which long exhaust lines to the transom (rear) could cause excessive back pressure. See Figure 4-3 for allowable back pressures. Should any information regarding installation conflict with USCG Regulations, follow USCG Regulations.

	Allowable Exhaust
	Back Pressure,
Model	≤ kPa (mm H2O)
4/8.5/9/23/27EFOZ and	9.81	(1000)
5/10/28/32EOZ
6.5EFOZ and 8EOZ	11.77	(1200)
11/16/17.5EFOZ and 13/20EOZ	6.37	(650)
3.5/11.5/13/19/20EFOZ and	4.90	(500)
4/14/15.5/23/24EOZ
33/40/55/70/80/100/125EFOZ	7.47	(762)
and 40/50/65/80/99/125/150EOZ

Figure 4-3 Allowable Exhaust Back Pressures

4.3.1Above-Waterline Installation

Install a customer-supplied silencer with the silencer’s outlet at a maximum of 3 m (10 horizontal ft.) from the center of the engine’s exhaust outlet. See Figure 4-4. Mount a typical silencer with the inlet and outlet horizontal and with the drain plug down. Use an exhaust hose pitch of at least 13 mm per 30.5 cm (0.5 in. per running foot). Some silencers require two support brackets or hanger straps for installation to stringers or other suitable structure. Follow the instructions provided with the silencer. Install any lift (see Figure 4-4, item 1) in the exhaust line below the engine exhaust manifold outlet.

12 Section 4 Exhaust System TP-6069 6/03