Spark plug crush washer direction -

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post #1 of 6 Old 05-06-2011, 07:08 PM Thread Starter
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Spark plug crush washer direction

I got a set of Autolite APP985 that came with crush washers. One side is flat and one is tapered. Which side goes toward the plug screw base? The NGK's that came out just have a flat washer so they are no help.

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post #2 of 6 Old 05-06-2011, 07:10 PM
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i am pretty sure the tapered seat goes towards the cylinder head.

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post #3 of 6 Old 05-06-2011, 08:38 PM
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Doesn't make one bit of difference.
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post #4 of 6 Old 05-06-2011, 08:40 PM
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X2^,just put the plugs in and tighten.
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post #5 of 6 Old 05-06-2011, 08:52 PM
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I've wondered if the washer went a certain way or not. Never seen any instructions on it. I always put the wider part of the washer against the head.
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post #6 of 6 Old 05-06-2011, 09:15 PM
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I always put the narrower part towards the engine block, although it doesn't matter...I still always do it.
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