If you are facing heating issue in your outboard motor then read this post. This post will tell you the reasons behind overheating in outboard motors.

1. Reasons behind Overheating in Outboard Motors
High-quality outboard water pumps like Yamaha outboard water pumps are
essential for the proper functioning of outboard motors. Water pump helps
water to move into the cooling system of the motor and thereby, the water
circulates into the power head and then goes out via exhaust system.
If outboard water pump does not work effectively then water movements
become difficult causing overhearing in the motor. Water pump is not the
only reason behind the overheating in outboard motor. There could be many
other reasons behind it. In this post, you will come to know what causes
overheating in outboard motors.
Rusty or Old Impeller
Impeller creates pressure to pump water into the power head of outboard
motors. If impeller does not work properly then it results into the
overheating in outboard motors. Impeller can cause overheating in two
conditions. First, it is rusty. With continuous use, impeller may be oxidised
and once oxidised (rusty), it cannot create pressure to pump water into the
power head of outboard motors. Second reason is the age of the impeller.
After all, it is a device, which must be taken care of and replaced after a
specific time.
Failure of the Water Pump
One of the most common reasons behind overheating in outboard motors is
failure of the water pumps. A water pump can be failed due to several
reasons that may include but not limited to lack of the pressure, lack of
fresh water, and defect in the heat exchanger. Quality of the water pumps
also matter a lot. Low quality water pumps are failed in less time whereas
good quality water pumps like Yamaha outboard water pumps run longer.
Engine Oil is not Changed
Changing engine oil in outboard motors on a regular interval is always
suggested, but many people ignore this important suggestion. If engine oil is
not replaced on regular intervals then it results in more heat because as it
gets older its molecules become less active. Thereby, proper lubrication is

2. not done and lack of lubrication often results in overheating in outboard
motors.
Improper Functioning of Exhaust Manifolds
When exhaust manifolds are clogged, they become non-functional and
thereby, cause overheating in outboard motors. When exhaust manifolds are
clogged, water cannot properly flow and thus more heat is generated. What
is the reason behind clogging of exhaust manifolds? Salty water, improper
care, and lack of timely service can be the reasons that may result into
clogged (rusted) exhaust manifolds.
These are a few common reasons that may cause overhearing in outboard
motors. While all these reasons are important to consider, failure of the
water pump should be given an extra care. Yamaha outboard water pumps
can be a good option to avoid overheating in outboard motors, as Yamaha is
a brand that is known for the quality.