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Old 09-23-2009, 12:57 PM   #1 (permalink)
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Default Drain plug crush washers

Getting ready to do an oil change and have a question.
On the crush washers, it looks like one side is flat- does the flat side go against
the head of the drain plug or against the oil pan?
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Old 09-23-2009, 01:13 PM   #2 (permalink)
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I don't why I do it other than it seems right or if it makes any difference for that matter but I put the flat side towards the bolt.
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Old 09-23-2009, 01:29 PM   #3 (permalink)
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I do the opposite bc the more rounded side I can actually seating on the underside of the plug head. I know that the wider side will seat on the pan.

But I doubt it matters.
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Old 09-23-2009, 02:38 PM   #4 (permalink)
 
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Yeah, I think it's just semantics, but I do flat side against the pan.
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Old 09-23-2009, 03:39 PM   #5 (permalink)
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Great question, I have never noticed which way I put it on.
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Old 09-23-2009, 04:03 PM   #6 (permalink)
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Originally Posted by adc View Post
I do the opposite bc the more rounded side I can actually seating on the underside of the plug head. I know that the wider side will seat on the pan.

But I doubt it matters.
I sort of knew we would do it differently ! Just Joking.

The rounded side is the one that can deform to irregularities. Which surface is most likely to have them?
I don't know.

More I think about it I suspect it is designed to deal with the two surfaces not being perfectly parallel.

I think we need to sticky this one and have a huge knock down flame fest over it.
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Old 09-23-2009, 04:08 PM   #7 (permalink)
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Flat side to the drain plug here..
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Old 09-23-2009, 04:09 PM   #8 (permalink)
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I paid attention when I changed it the first time. It was originally assembled with the flat side against the pan, that is the way I've continued to do it. Not sure it matters, but I figured Subaru would have done it correctly if it does.
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Old 09-23-2009, 09:02 PM   #9 (permalink)
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Flat side to plug. Going on 8 oil changes and 29K miles. No probs yet.
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Old 09-24-2009, 02:19 AM   #10 (permalink)
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I sort of knew we would do it differently ! Just Joking.
I think we need to sticky this one and have a huge knock down flame fest over it.
I think you can see I'm not real passionate about it.
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Old 10-06-2009, 11:13 PM   #11 (permalink)
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While we're on this subject again, I have a question.

On the 5MT for model year 04, on that T70 torx drain plug, does that use the same crush washer as for the engine drain plug?
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Old 10-07-2009, 01:23 AM   #12 (permalink)
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Funny, I had the same question when I did my change. I was like crap, how did this go Scratched my head and put it flat side towards the plug. No leaks yet
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Old 10-07-2009, 02:07 AM   #13 (permalink)
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Quote:
Originally Posted by Tremo View Post
While we're on this subject again, I have a question.

On the 5MT for model year 04, on that T70 torx drain plug, does that use the same crush washer as for the engine drain plug?

If its like on the 08 Auto, its a copper washer. I suppose you could replace it but I inspected it and used it over. I have done it twice. It is not a crush one.
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Old 10-11-2009, 12:48 AM   #14 (permalink)
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If its like on the 08 Auto, its a copper washer. I suppose you could replace it but I inspected it and used it over. I have done it twice. It is not a crush one.
Does that 08 Auto use a T70 plug?
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Old 10-11-2009, 04:37 AM   #15 (permalink)
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Quote:
Originally Posted by Tremo View Post
Does that 08 Auto use a T70 plug?
Don't think so, both of my 4EAT's have regular drain bolt plugs.

The front differential drain plug is a Torx though.
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