SECTION 6B3 - ENGINE COOLING -

GEN III V8 ENGINE

IMPORTANT

Before performing any Service Operation or other procedure described in this Section, refer to Section

00 CAUTIONS AND NOTES for correct workshop practices with regard to safety and/or property damage.

1. GENERAL I NFORMATI O N

Apart fr om a m inor change to the engine vapour vent s ystem and a c hange in the c oolant pump, the cooling sys tem

for VX Series Models equipped with the GEN III V8 engine rem ains unchanged f rom VT Series II Models , and is as

detailed in Section 6B3 ENGINE COOLING – GEN III V8 ENGINE of the VT Series II Service Information, noting

the following:

1. A minor change to the cooling fan wiring has been implemented, involving a single sealed connector. This

change however, does not affect the operation of the cooling fans. For additional information, refer to

Section 12N FUSES, RELAYS & WIRING HARNESSES and Section 12P WIRING DIAGRAMS in the VT II

Series, Service Information.

2. With the introduction of the MY2001 GEN III V8 engine to VX Series vehicles, the change in intake manifold

(refer Section 6A3 ENGINE MECHANICAL – GEN III V8 ENGINE in the VX Service Information), has meant

that a revision to the engine vapour venting was necessary.

Any vapour that develops in the engine (or air

when the cooling system is being filled), is

routed back to the coolant surge tank, through

a vapour vent pipe (1), fastened to the front of

the cylinder heads in two places, by double

ended studs (2). The rear locations are now

blocked by two vapour vent covers (3). The

gaskets (4) used in all four locations remains

unchanged.

As previously detailed, vapour then flows via

hoses, through the throttle body, to the left

hand radiator surge tank. Another vent hose

then connects the left hand radiator side tank

with the coolant surge tank, thereby directing

vapour to that point.

Testing has shown that the vapour venting

efficiency remains unchanged from the

previous system.

Figure 6B3-1

3. A change in supplier has resulted in the engine

drive belt pulley now being permanently

attached to the coolant pump hub. Other

changes include dif ferent length attaching bolts

(2) and unique carrier gaskets (3). Refer to

Section 6A3 ENGINE MECHANICAL – GEN

III V8 ENGINE in the VX Service Information

for further detail.

The new coolant pump will service back to

earlier build engines, provided the bolts and

gaskets are also fitted.

NOTE: The later design gaskets are NOT to be

used with the earlier design coolant pump, nor are

the earlier gaskets to be used with the later pump.

Figure 6B3-2

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1.1 SERVICE NOTES

To reduc e the impact on the envir onment and the maintenance cos t, whenever the c oolant is drained fr om the GEN

III V8 engine, the ser vice recor ds are to be check ed to determ ine when the coolant was last changed. If m ore than

six months life is left before the next coolant change, then the following procedure is to be adhered to:

1. W hen draining the coolant f rom the engine, use a c lean container of at least 12 litres capacity and ensur e that

the coolant is not contaminated in the draining process.

2. After repairs have been completed, refill the engine cooling system with the drained coolant.

3. Top up as required, using a 50% mixture of DEX-COOL® to GM Specification 6277M to 50% clean, good

quality water. Refer 2.2 COOLANT MAINT ENANCE and 2.3 DRAINING AND FILLING COOLING SYST EM in

the VT Series II Service Information for the necessary procedures and further information.

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