Coolant Leak at Drain Plug - Yamaha FJR Forum : Yamaha FJR Owners Forums
 
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post #1 of 3 (permalink) Old 02-26-2018, 07:59 AM Thread Starter
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Coolant Leak at Drain Plug

I just replaced the coolant on my Gen III using the simple drain and fill with Yamalube. I reused the OEM copper washer/gasket per the prevailing wisdom that is OK. Unfortunately there is a very small leak at the drain bolt now. I confirmed it is the drain bolt and not the water pump hoses. The leak is very slight and maybe a drip every two hours. I put a shop rag under the bolt to catch the drips while I decide what to do next.

So the question is, did I miss something such as an extra step to apply silicon sealant to the bolt? There wasn’t any when I removed it. Alternatively, does a little coolant dry and seal the bolt over time? I have a new copper gasket on order so I can replace the one I reused, but thought I’d poll the forum in case there is some FJR wisdom I missed.

Current: 2013 Triumph Rocket 3 Touring - Rosie
Former: 1979 Honda CB750, 1994 Honda Magna, 1995 Honda Magna, 1982 Honda CBX, 1997 Honda Magna, 1997 Honda Valkyrie Tourer, 2013 Yamaha FJR1300 - Gutnis

Last edited by wiggy1; 02-26-2018 at 08:02 AM.
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post #2 of 3 (permalink) Old 02-26-2018, 08:29 AM
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I've worked on many FJR's old and newer that have several coolant changes, we've never changed a copper washer yet. Snug it up some more, and of course, don't crank it in so hard you strip it. You'll 'feel' when it's tight and won't go any more without ham-fisting it. Something that might be helpful is to back it out a half turn before you tighten it.

Copper washers can get work-hardened over repeated installs, but I'm guessing this is only your first or second coolant change, so that hasn't happened. If you want to soften it, anneal it with a propane torch (while it's off of course).

Ray
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2014 FJR1300A - Root Beer, 2008 WR450F, 2006 FJR Project
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post #3 of 3 (permalink) Old 02-26-2018, 10:14 AM Thread Starter
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@RaYzerman - thanks for the tip. I tried to reseat the washer a couple of times and it still has that little dribble. I will give it a few days and see if it goes away. The bike only has 8200 miles so the washer shouldn’t be hardened yet, but I will try anealing if the problem persists.

Current: 2013 Triumph Rocket 3 Touring - Rosie
Former: 1979 Honda CB750, 1994 Honda Magna, 1995 Honda Magna, 1982 Honda CBX, 1997 Honda Magna, 1997 Honda Valkyrie Tourer, 2013 Yamaha FJR1300 - Gutnis
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