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Oversize oil drain plug

  • Thread starter Thread starter ToddStyles
  • Start date Start date
T

ToddStyles

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I had to replace my oil drain plug with an oversize M14. The plug is about a 1/4" or so longer than the magnetic plug I replaced. It appears there is plenty of clearance, but I wanted to check with the pros on the board before I started the bike. Any issues with the slightly longer plug?
thanks.
 
i put one of these in a couple of monhs ago and i haven't had any problems with it at all.
 
Thanks for the info. I used a rubber washer with the oversized plug and I'm still getting a slight drip. I'm going to try the washer that is rubber with a metal outer ring. I figure the rubber is distorting some when I tighten up the plug.
Todd.
 
ToddStyles said:
Thanks for the info. I used a rubber washer with the oversized plug and I'm still getting a slight drip. I'm going to try the washer that is rubber with a metal outer ring. I figure the rubber is distorting some when I tighten up the plug.
Todd.
Click to expand...

You'd be better off with a copper or aluminum washer. With rubber you don't ever really get the plug tight which can lead to leaks.
 
oversize plug

oversize plug

I've been running an oversize oil drain plug on my 850 for a year now with no problems. Used the stock rubber gasket, it was a real tight fit over the oversize plug. Also the plug I used had a flange on the bolt head. Got mine at Autozone. It was about a 1/4 in longer than stock.
 
When I picked up the rubber and metal washer at the parts store (which I have not installed yet), they had several types of oil plug washers. Solid copper, solid aluminum, "crush-type" copper, fiber, plastic/nylon and a few others it seems like. I do remember the rubber gasket that I used originally (that's leaking now) wasn't a tight fit over the bolt threads. It came with the oversize plug.

The oversize plug itself is a nice tight fit into the pan. I'm still confused about what type of plug and gasket combo will eliminate my drip.
Todd.
 
For a good seal you want a smooth surface on both the bolt and the pan to pinch the washer between. Even with good sealing surfaces the washer still needs to crush a little and conform to assure no leak path is present. You want a firm material for the washer so it will crush a little but still allow the bolt to reach a decent torque level so it won't loosen later. Copper is a popular choice but aluminum and plastic are popular as well. Rubber washers should be avoided since it's hard to get a good clamp on the bolt. O-rings are different since they are usually trapped inside a groove or such so the bolt itself is able to reach torque.

Hope this helps.
 
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