Section 6 - Engine - GMC GMT 610 Manual

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No body part or chassis-mounted component may be located within 2.0 in. of brake hose routing in all wheel and axle positions. All exhaust
system components must also have a minimum of 2.0 in. clearance to brake hoses in closest positions. (Be sure to account for brake hose
travel with suspension.) Note: Heat shielding is likely required with clearances even greater than 2.0 in. Keep the brake fluid temperature
below the boiling point of water under all operating conditions.
Body builder is to verify that the brake warning switches are operative. (The brake warning switch on models equipped with vacuum-
hydraulic brakes is located adjacent to the master cylinder vacuum unit.) This includes the brake system differential pressure. (The parking
brake actuator switch is mounted on the park brake apply mechanism which is mounted on the L.H. body side inner under the instrument
panel.)
The park brake system is equipped with an automatic adjuster. Do not separate the park brake cables unless the apply mechanism is
blocked out. The adjuster will wind in the cable until it can no longer be reconnected if not blocked (pinned). See the Pin UP procedure
outlined in Section 5, Enabling the Park Brake Automatic Adjuster, in the G Van Service Manual.
For additional information refer to Body - Section 1.
Air conditioning and auxiliary belt-driven equipment installation recommendations:
No alterations or additions to the accessory drive belt system will be warranted on either multiple belt systems or serpentine belt systems.
The serpentine belt type of drive is designed as a total system, incorporating a single poly-V belt and an automatic tensioner. In this type of
system, degrees of pulley wrap, belt tension, and pulley alignment are very critical factors. Modification is not recommended.
The fan and fan clutch that come with the vehicles are matched to the equipment and conditions encountered in normal operation.
Substitution of the fan and/or fan clutch may affect cooling performance. A substitute fan may be subjected to excessive stresses and might
break. Substitution is therefore not allowed.
The incorporation of an aftermarket air conditioning system could have the following consequences:
• Vehicle/engine/coolant overheating in certain geographical areas that normally experience high ambient temperatures.
• Restrictions to engine cooling fan airflow resulting in higher fan blade stress.
G/H Van (GMT 610) 2005
GMT 610
Section 6 — Engine
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