Radiator And Hoses; Cooling Circuit Inspection; Radiator Cap Inspection; Radiator Inspection - Suzuki LT-Z400 Service Manual

5-4 COOLING AND LUBRICATION SYSTEM

RADIATOR AND HOSES

COOLING CIRCUIT INSPECTION

Before removing the radiator and draining the engine coolant,
check the following.
Check the cooling system for leaks with a radiator tester 1.
Remove the radiator cap and connect the radiator tester to the
filler. Pressurize the cooling system with 120 kPa (1.2 kgf/cm²,
17 psi) of pressure, and then check if it holds the pressure for 10
seconds. If the cooling system does not hold the pressure for at
least 10 seconds, check the entire cooling system for leaks. If a
leak is found, replace the damaged part.
#
* Do not open the radiator cap when the engine is hot,
as you may be injured by escaping hot liquid or
vapor.
* When removing the radiator cap tester, put a rag on
the filler to prevent the engine coolant from spraying
out.
!
Do not exceed the radiator cap release pressure, or
the radiator cap and subsequently the radiator, can be
damaged.

RADIATOR CAP INSPECTION

Check the radiator cap 2 using a radiator tester 1.
Attach the radiator cap to the radiator tester as shown. Slowly
apply pressure to the radiator cap; do not exceed 108 – 137 kPa
(1.1 – 1.4 kgf/cm², 15.6 – 19.9 psi). If the radiator cap does not
hold the pressure for at least 10 seconds, replace it with a new
one.
$ Radiator cap release pressure: 108 – 137 kPa

RADIATOR INSPECTION

Check the radiator for dirt and other foreign materials. If any are
found, clean the radiator using compressed air. Also, repair any
bent or dented fins using a small screwdriver.
Check all the water hoses for cracks, flat spots, or loose connec-
tions. Replace any damaged hoses and properly tighten any
loose connections.
(1.1 – 1.4 kgf/cm², 15.6 – 19.9 psi)