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Drain plug bolt size

   
Old Nov 29, 2004 | 04:28 PM
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mmartinez's Avatar
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From: New Mexico
Question Drain plug bolt size
I've got a 2003 F150 with a 4.2L V6. What's the size of the engine oil drain plug?

Also, immediately adjacent to the oil filter is a bolt requiring an allen wrench. What is the purpose of this bolt?

Thanks!
 
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Old Nov 29, 2004 | 06:16 PM
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BlueOvalFitter's Avatar
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My 97 is a 15mm. I think the newer 4.2s are 13mm.Try both; it has to be one or the other.
I'm pretty sure that allen screw is where the oil cooler hose connection goes.
 
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