Technical Service Bulletin
||Block heater installation cautions.
All 1999 Miata
When installing a block heater, observe the following cautions:
- Be sure the element is maintaned at the 3 o'clock position, as shown, and that it does
not rotate during installation.If the block heater rotates while being tightened, damage
to the o-ring may occur resulting in a coolant leak. This caution is very important and is
not stated in the early version of the installation instructions which were packed with
the kit. The instructions in the current production kits have been updated to contain this
caution. See illustration below.
- Be sure to thoroughly lubricate the o-ring only with grease provided (silicone based) in
the kit.Other types of grease will damage the o-ring.
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