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post #1 of 12 (permalink) Old 10-25-2013, 07:22 PM Thread Starter
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what are these

i see them on many engines but what are these plugs for?
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post #2 of 12 (permalink) Old 10-26-2013, 05:36 PM
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Can be many things, like different equipment fitted to engine: pumps, extra cooling, things driven by engine and so on.. Could also be for tools when engine was built, but just guessing.
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post #3 of 12 (permalink) Old 10-26-2013, 08:24 PM
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Are they core plates (for engine casting) or freeze plugs? Those don't usually have fasteners tho, they just press in. Anyone? Bueller... Bueller?

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post #4 of 12 (permalink) Old 10-27-2013, 10:37 AM
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Freeze plug. I just changed one out on my M129. pn=180 015 08 05
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post #5 of 12 (permalink) Old 10-27-2013, 04:08 PM Thread Starter
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Very good
Since I will have the block out was wondering if I should replace these.
Should I?


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post #6 of 12 (permalink) Old 10-27-2013, 04:23 PM
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yes , change them all .
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post #7 of 12 (permalink) Old 10-28-2013, 06:01 PM
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no need to change them, honestly. I would take them out, clean them, and replace the gaskets underneath them.
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post #8 of 12 (permalink) Old 10-28-2013, 06:54 PM Thread Starter
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Do they have specific gaskets or I can make them myself?


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post #9 of 12 (permalink) Old 10-28-2013, 07:06 PM
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there are specific gaskets, but I'm sure you can make them yourself. the OE one is not expensive, either. about $3.
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post #10 of 12 (permalink) Old 10-31-2013, 05:24 AM
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those are freezing plugs but also used to remove inside dirt on the block. If you pull them out use a screw driver, a hose and start removing inside corrosion deposits. You can built your own gaskets.
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