Isuzu Cars and Trucks 1981-1991

Freeze Plugs and Block Heater

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REMOVAL AND INSTALLATION

The engine block heater is located under the exhaust manifold in place of an engine freeze plug. Allow the engine to cool, drain the antifreeze into a suitable container and position the pan under the block heater. Loosen the retaining bolt and remove the heater from the engine.


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

Clean the mounting surface, apply sealer to the heater, install the heater and tighten the retaining bolt.

To engine freeze plug can be removed by drilling an 3mm ( 1 / 8 in.) hole and thread a body dent puller into the hole and pull outward. An alternative is to drive a prybar into the lower edge of the plug and pull through the hole. When installing the plug, coat the outer edge with sealer and drive the plug in with a socket that fits inside the lip and a hammer.



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Fig. Engine block heater C223 diesel engine shown, others similar



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Fig. Engine block heater continuity check. There should be continuity



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Fig. Freeze plug removal

 
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