c.
Anti-freeze concentration greater than 68% will adversely affect freeze protection, corrosion inhibitor additives and
heat transfer rates.
IMPORTANT-- Anti-freeze made with methoxy propanol or propylene glycol is not recommended
for use with IH engines. These types of anti-freeze can damage engine internal seals and
coolant hoses and create a potential fire hazard due to lower flash points than ethylene glycol
type anti-freeze.
d.
All cooling system conditioners, including those in anti-freeze solutions, become depleted through normal
operation. If conditioners in anti-freeze are allowed to become depleted, the anti-freeze becomes corrosive and attacks
and coats metallic surfaces of the cooling system, which reduces heat transfer. To maintain an acceptable conditioner
concentration, additional chemicals must be supplied to the cooling system. Your IH Dealer can assist you with cooling
system conditioner service information.
3-9.2.2 Coolant Filter Element
NOTE
The original filter may be larger than the service filter. The original filter contained sufficient amount of
corrosion inhibitor to precharge the cooling system to recommended concentration.
a.
Maintenance to the coolant filter service element should be maintained at the interval listed in lubrication section of
this manual Chapter 4. Do not treat the coolant system at earlier intervals or add additional inhibitors. Over
treatment of the coolant system will cause radiator plugging and solder deterioration.
b.
The coolant filters should only be used with ethylene glycol type anti-freezes that do not contain anti-leak
additives. The anti-leak or stop leak additives are removed by the filter element which could restrict coolant flow
from filter. Do not use methanol alcohol or methoxy propanol (Dow Therm 209) base antifreeze as they are not
compatible with the treated service element.
3-9.2.3 Cleaning
a.
Once a year the cooling system should be drained and thoroughly flushed. (Flush with cooling system conditioner
every 24 months).
b.
Unless the cooling system is treated with a corrosion preventative, rust and scale will eventually clog up passages
in the radiator and water jackets. This condition is aggravated in some localities by formation of insoluble salts
from the water used.
3-8
