Perkins Phaser Series - Page 287

21 COOLING SYSTEM
Intercooler
A water-to-air intercooler assembly (A1) is fitted to
the induction manifold of some high rated four
cylinder engines to cool the air between the
turbocharger and the combustion chamber. Hot air
from the turbocharger passes through the casing of
the intercooler and over the fins on the integral tube
stack before it enters the combustion chamber. The
air is cooled by the coolant which passes through
the tubes of the tube stack. The coolant is
circulated from the front of cylinder head, through
the tube stack to the rear of the cylinder block by
the coolant pump for the engine.
In addition to the engine coolant pump, certain
engines have an auxiliary coolant pump mounted
onto the right hand side of the cylinder block. The
auxiliary pump circulates coolant directly from the
radiator to the tube stack of the intercooler (A1).
The coolant leaves the intercooler and is returned
to the radiator.
The intercooler cannot be dismantled.
To remove and to fit21A-10
Caution: Do not damage the fins of the tube stack.
To remove
1 Release the hose clips (A9) and (A10) which
fasten the air hose from the turbocharger to the
intercooler and slide the hose up the intercooler
pipe.
2 Release the hose clips which fasten the hoses to
the coolant inlet (A6) and the outlet (A5)
connections of the tube stack and remove the
hoses.
3 Remove the two setscrews (A4) which secure
the flange (A3) and the "O" ring (A2) to the outlet
of the tube stack. Remove the flange and discard
the "O" ring.
Caution: Do not use a lever between the face of
the flange
(A8) to separate the intercooler assembly
from the induction manifold.
4 Release the 14 setscrews which secure the
intercooler assembly to the induction manifold, in
the reverse sequence to that shown in (A).
Caution: Do not use force to remove the outlet
pipe of the tube stack from the induction manifold.
5 Carefully lift the intercooler assembly enough to
allow movement of the intercooler toward the rear
of the engine. This will allow clearance of the pipe
connection (A6) from the induction manifold. When
the pipe is free of the manifold remove the
intercooler assembly and discard the joint (A7).
6 Clean and inspect the intercooler assembly,
operation 21A-11
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PA192
21A.26 Perkins Phaser/1000 Series, April 1995