IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

Need help identifying part on engine block

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Old 10-17-15, 10:44 PM
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vleong1
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Default Need help identifying part on engine block

Sorry for the noob question but I have looked online and parts diagram with no luck. Does anyone know what these round plugs/caps are? Is it possible for them to leak oil?

Passenger side:


Driver side:
Old 10-17-15, 11:46 PM
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pauls927
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That looks like a freeze plug. Usually they will only leak coolant. I believe they were originally designed to spare the block from cracking in case of a hard freeze and no antifreeze. The expanding ice would push them out of the block. They as re usually made from steel and can deteriorate in time. Is this a 2.5 or 3.5?
Old 10-17-15, 11:49 PM
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pauls927
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Btw, it looks like your oil is probably leaking from above, maybe valve cover gaskets.
Old 10-18-15, 10:51 AM
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vleong1
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Originally Posted by pauls927
That looks like a freeze plug. Usually they will only leak coolant. I believe they were originally designed to spare the block from cracking in case of a hard freeze and no antifreeze. The expanding ice would push them out of the block. They as re usually made from steel and can deteriorate in time. Is this a 2.5 or 3.5?
Thanks! No coolant leaking. This is a 3.5L. I'm slowing taking everything out to reseal my timing cover and was worried when I saw those plugs covered in oil..


Originally Posted by pauls927
Btw, it looks like your oil is probably leaking from above, maybe valve cover gaskets.
I agree. I have new gaskets for both covers so that should take care of that.
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