Thermostats Operation 12-1 To Remove - Perkins New 1000 Series Workshop Manual

12
New 1000 Series
Thermostats
To remove Operation 12-1
Most engines are fitted with a single thermostat (A), some engines have twin thermostats fitted (B)
Identification of the thermostat is by the nominal temperature which is stamped on the by-pass valve (A6) of
the thermostat.
1 Drain the coolant in the cooling system to a level below the thermostat position and disconnect the top hose
from the coolant outlet connection.
2 Release the four setscrews and remove the thermostat housing (A1) from the lower body. Discard the joint
(A5).
Note: Engines with a plastic thermostat housing have an "O" ring fitted to the flange face of the housing
instead of a joint.
3 Press the retainer clips (A4) away from the groove in the thermostat body, and lift the plastic collar from the
thermostat housing. If the retainer clips are damaged or the collar is loose discard and renew the plastic collar.
Caution: It is important that the correct collar is fitted.
4 Remove the thermostat and "O" ring assembly (A3) from the thermostat housing. Discard the "O" ring.
1
1
2
3
B
A0267
6
5
4
A
A0405
258 Workshop Manual, TPD 1350E, Issue 4
This document has been printed from SPI². Not for Resale