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what size wrench?

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monarchd's picture
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We are trying to get the proper size hex wrench to install a block heater on our 77 300D...we need to call around and wondered if anyone new what size was needed off hand? Any tips appreciated...Thanks

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sur5er's picture
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Not sure, but it isn't an oddball size either. I want to say 24mm. If its been in that long, soak it with a penetrating oil. It might even help to get the engine up to operating temp to break it free........ then wait for it to cool down to remove the plug.

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