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Old 03-11-2010, 08:11 AM   #1 (permalink)
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What's with the "O" Rings on the drain plugs?

I just changed my oil ( s )...( for the first time ) on my new ( to me ) 2008 Super Glide Custom.

What's with the rinky -Dink ...round " O " rings on the drain plugs....you tighten them and they squeeze out the sides.( they should at least be flat!!!!)

Is that what Harley does???? or did the previous own do something stupid like that?

I went to Nappa and got special drain plug washers 12 MM ( with rubber one side) cost $5 for 10.
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Old 03-11-2010, 08:23 AM   #2 (permalink)
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Quote:
Originally Posted by est.1954 View Post
I just changed my oil ( s )...( for the first time ) on my new ( to me ) 2008 Super Glide Custom.

What's with the rinky -Dink ...round " O " rings on the drain plugs....you tighten them and they squeeze out the sides.( they should at least be flat!!!!)

Is that what Harley does???? or did the previous own do something stupid like that?

I went to Nappa and got special drain plug washers 12 MM ( with rubber one side) cost $5 for 10.
This is why HD recommends that you change then with each oil change. They get ratty and torn after a while.

Of course, then HD makes $3.50 off the primary o-ring and $4.00 off each trans and oil drain plug.

Not sure why they don't use a better lasting or better, PERIOD, method of sealing the plugs.

I also see that overtightening the plug (it's a drain plug, not a lug nut) aids in the premature failure of these o-rings as well.
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Old 03-11-2010, 01:58 PM   #3 (permalink)
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Thanks Dave

You are right...there are much better designs.
My v Star...had a plastic washer on the plug and I never had to change it ever.... in the 6 years I had it.

Good thing I didn't go to the HD dealer to replace the Rinky- Dink " O " Ring ...$3.50 - 4.00 ...that's a crime...... but I guess everyone has to make a buck.

That's why it pays to think...for yourself.

Brent
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Old 03-11-2010, 02:02 PM   #4 (permalink)
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Thanks Dave

You are right...there are much better designs.
My v Star...had a plastic washer on the plug and I never had to change it ever.... in the 6 years I had it.
Brent
You may notta did it, but I think your supposed to. My car has a crush metal gasket that gets changed everytime. I've changed the gasket on my bike once - just cause I had the o-rings and felt like it. Certainly didn't look like it needed it.
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Old 03-11-2010, 02:38 PM   #5 (permalink)
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I agree with the OP.

Recently I checked the torque of my oil drain plug and found it to be low, because the o-ring had flattened out. I thought that was kinda scary.
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Old 03-11-2010, 06:55 PM   #6 (permalink)
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I use 5 cent o-rings from the hardware store (-011, I think). If you use the right size o-ring it won't cause any problems for at least 3 oil changes. If you look carefully at the pan, you will see a groove where the o-ring is supposed to sit. An o-ring that is too big in diameter or cross section will cause problems.
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Old 03-11-2010, 07:04 PM   #7 (permalink)
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$2.56 for a pack of 100 here.
http://www.mcmaster.com/#9452k57/=66en2b
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Old 03-11-2010, 07:52 PM   #8 (permalink)
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I just called the "local" HD Dealer (80 miles from my house) and had him send me a service kit that contained 3 o-rings (oil, trans, primary), and the gasket for the derby cover for 4 bucks and change.
I didn't think that was bad at all..
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Old 03-28-2010, 09:54 AM   #9 (permalink)
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Quote:
Originally Posted by est.1954 View Post
I just changed my oil ( s )...( for the first time ) on my new ( to me ) 2008 Super Glide Custom.

What's with the rinky -Dink ...round " O " rings on the drain plugs....you tighten them and they squeeze out the sides.( they should at least be flat!!!!)

Is that what Harley does???? or did the previous own do something stupid like that?

I went to Nappa and got special drain plug washers 12 MM ( with rubber one side) cost $5 for 10.
Those fkg mickey mouse plugs are not designed correctly. A thin flat washer needs to isolate the sharp edges of the hex part so it don't snag the ring and tear it out. At the very minimum the sharp edges on the hex flats need to be filed with a slight chamfer. As is, 50% of the time they snag the ring and it gets sheared off, no matter how much grease you apply or how carefull you are. Having worked in a hydraulic cylinder shop, I've cussed these things from the first time I did fluid changes. Time to make it right.
Ron
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Old 03-28-2010, 12:06 PM   #10 (permalink)
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I got to laugh guy with his 08.......

I've never had a leak on the oil plug. My 01 oil pan started eating them up around 30 or 40k. Can't figure out why. But no leaks, just replace on the next change.

I would think long and hard before I change the design on the oil plug. Your taking your engines life in your own hands. I had a Jword oil plug come loose once,, my fault, engine blew before I caught it.
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Old 03-28-2010, 01:08 PM   #11 (permalink)
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I change them out every other oil change when I get the gasket kit. 3 o rings for drain plugs and primary cover gasket. I guess I should just order a few of them when i get some oil filters online and just have them ready to go.
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Old 03-28-2010, 01:17 PM   #12 (permalink)
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I inspect the orings, if they look ok I reuse them. I don't change out the primary, derby or inspection cover, I just keep reusing them.
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The only thing that counts in the end is power! Naked merciless force! -Ursus
The Devil made me do it the first time, the second time I did it on my own-Waylon
Helmets are like rubbers you know you should wear one, but its so much better when you don't.-Me
Sometimes I think its a sin, when I feel like I am winning when I am losing again.-GL
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Old 03-28-2010, 04:09 PM   #13 (permalink)
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At less than fifty cents an o-ring, i'll change them every time.
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Old 03-28-2010, 04:53 PM   #14 (permalink)
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At less than fifty cents an o-ring, i'll change them every time.
As do I, but the original posters question was why they don't sit correctly or get cut up when new. A simple debur on the inside edge of the hex flats will stop this oring abuse.
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Old 04-02-2010, 08:33 PM   #15 (permalink)
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i just did my first oil change on my 09 RKC.the first 1000 mile was done by the dealer.the plug had some type of white pipe dope on the threads. the oil filter was so tight i had to put some ass on the wrench to get the thing off.so i guess the dealer uses an impact wrench to put the filters on.i hope i havent screw up by using the old o-ring over it looked fine.
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