Malibu Boats Response TXi Owner'S Manual Download

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Cooling System

All Malibu Monsoon Engines

feature a hybrid of raw water

cooling and closed cooling.

Peak

Sierra Brand, 5-year, 100,000-mile,

Marine Grade Coolant (propylene

glycol) in a 50/50 mix with distilled

water is strongly recommended.

From an empty tank to the

proper amount of coolant/water

mix will require approximately two

gallons. Directions for maintaining

proper levels are provided in the

Care and Maintenance section of

this manual.

Without the need for a radiator such as used by land-based

engines, the functionality of the cooling system is dependent upon

operation within a body of water or maintaining the appropriate

level of coolant/water in the system. Reducing operational heat

from the engine is critical to ensuring the engine continues to

perform. As Malibu Monsoon engines are configured, temperatures

in excess of 200

F (93

C) are considered to be overheating

situations.

NEVER run the boat engine with the
boat out of a body of water! Even in
closed cooling systems, some external

water is used in the cooling process. Without water to circulate
in the system, the engine will quickly overheat and can cause
permanent damage that is not covered under warranty!

Be certain to read the Care and
Maintenance section of this manual for
important information regard routine

and regular functions that must be performed. Some of these tasks
overlap engine and boat component attention and should never
be skipped. Failure to perform care and maintenance can result in
damage to the boat and engine that is not covered under warranty.

Regularly review the engine
temperature information provided on
gauges or video screen. Warning lights

and alarms also are part of the system to provide early warning
when engine temperatures begin to exceed acceptable levels.
Continuing to operate a boat that is overheating the engine and
powertrain will result in engine failure eventually. Ignoring or
failing to take proper steps to reduce the engine temperature,
resulting in damage, is not covered under the warranty.

If an engine overheats, consider several factors before shutting

down.

(Turning off the engine when it is overheated may not provide

immediate relief, and in some instances can actually cause additional

harm.)

If the boat has been idling for a prolonged period of time and the

engine became overheated, attempt to reduce the temperature by

operating the boat at a higher speed, preferably at normal running

speed. This will increase the speed of water flowing through the

cooling system, assuming there is sufficient fluid.

If the boat has been running at a higher rate of speed for a

prolonged period of time and overheats, reduce speed for a few

minutes to see if the temperature reduces. Running at wide-

open-throttle (WOT) for too long can challenge the cooling

system.

If there is no immediately discernible cause for overheating, or if

the temperature does not begin to descend back to the normal range,

turn off the engine and carefully open the engine compartment

(but

never if there is an odor of fuel).

Ambient air should eventually

cool the engine, but if there is resulting damage to the engine from

overheating, it may not restart, and the boat may need to be towed to

shore.

Never directly touch an overheated
engine. Temperatures can exceed 200

Fahrenheit (93

Celsius), which would

cause instant and serious burns, even through gloves or clothing.

The water pumps on the engine that circulate water and coolant

throughout the engine during operation are essentially inaccessible

to the consumer. The circulation pump, which circulates coolant,

is located on the bottom of the front-end accessory drive. If it

requires attention, that should be done by a service technician at an

authorized Malibu dealership.

Another pump, the raw water intake pump, is utilized to bring in

water from the body of water. The raw-water pump is located on the

top of the front-end accessory drive, adjacent to the alternator. Its

purpose is to draw and circulate water from the body of water in which

the boat is operating to increase the cooling effect for the engine.

Water is brought through the raw water pickup, which is located at the

transom, next to the steering tiller arm. The entire cooling system is

located on the front of the engine on the transom side.

As part of the routine annual maintenance, the raw water pump

should be inspected, with particular attention to the impeller. The

process for inspection is explained in the

Care and Maintenance

section of this manual.

If the boat is operated in shallow or brackish

water, or if the boat is run aground, the impeller should be checked

regularly. Silt, sand, dirt and weeds can accelerate the deterioration

of the impeller.

Malibu boats are equipped with a flush kit. The process for

properly using a flush kit is explained in the

Care and Maintenance

section of this manual.

Inspect that the flush cap is tight before

every outing or it will suck air and
could damage the cooling system. Such

damage is not covered under warranty.

Most often, the cause of overheating

is either marine growth clogging the raw

water intake or insufficient coolant/water.

If there is debris, even in small amounts,

in the body of water, during usage it is

likely that some of the marine growth can

accumulate in the cooling system.

To protect the system, a sea strainer

is installed near the raw water intake and

serves the purpose of keeping debris from

entering the cooling system, causing eventual engine failure. As with any

kind of strainer, it is necessary to regularly clean it so that water can flow

unimpeded.

Except for the sea strainer and raw
water impeller, consumers should
not attempt to inspect or repair

components of the cooling system. Most are inaccessible. All
can be inadvertently damaged if not properly accessed, often
necessitating specialized tools. Attempting unauthorized
inspection or repair can void the warranty.

84—Engines & Powertrains