Repair Manual MAN-00190
THAR CRDe BS-IV MAY 2012/Rev 1
The repair methods given by the manufacturer in this document are based on the technical specifications, current at the time of release. The methods may be modified as a result of changes introduced by the
manufacturer in the production of the various component units and accessories from which the vehicles are manufactured. The reproduction, translation, transmission, in part of or whole of the present
document, are prohibited without the prior written consent of Mahindra & Mahindra Ltd. The use of this document by any person other than the trained personnel, at the Authorized Service Centre of
Mahindra & Mahindra Ltd., will amount to unauthorized use and shall be liable for penalty/prosecution© 2012 Mahindra & Mahindra Ltd.
Dismantling & Assembly of the Cooling System
• Water Pump
• Viscous Fan Drive
Do not remove the radiator drain cock or the Engine coolant plate drain with the engine in hot
condition.
Always remove the pressure on the system by removing the radiator cap before undertaking any
work on the cooling system.
If the coolant is not contaminated then collect the coolant in a clean container so that it can be
reused. Replace coolant as per recommendation
Water pump –
A centrifugal water pump is used to circulate the coolant through the water jackets, cylinder head,
hoses and radiator. The water pump is belt driven by the engine main drive pulley. It ratio of pulley
diameter ensures that the water pump rotates 1.30 times the engine speed.
The water pump impeller is pressed onto the shaft. The shaft is supported on two bearings that are
integral to the shaft.
The water pump seal is located between the impeller and the housing. The housing has a small hole to
allow the seepage to escape. That also acts as an indication point if the water pump seal fails.
Water pump removal &
Refitment.
The water pump is not serviceable and has to be changed as an assembly.
Viscous Fan Drive Operation –
The viscous drive unit for the engine-cooling fan provides a means for controlling the speed of the fan
relative to the temperature of the engine. The viscous fan unit is a type of fluid coupling, which drives
the fan blade by means of silicone fluid
There are two main components of the viscous fan drive: input (drive member), which consist of a
threaded shaft passing through a bearing into the clutch plate and secured to the water pump. The
output (driven) member comprises of the main body to which the fan is attached, with the
temperature sensing mechanism (bi- metal coil) and pump plates.
The fan drive has to be engaged only periodically, between 5 to 10% of the normal operating
conditions because the rest of the time the vehicle cools itself by ram air-cooling.
To Next Page
Loading...
