Kane 303 Posted January 18 Report Share Posted January 18 Changing my oil today, I noticed that the new OEM crush washer for the 17mm drain plug, P/N GU10528900, does not have the nifty little rubber gasket in the center of the washer like the one coming off of the bike. I guess Piaggio is saving money by omitting the rubber center (while charging $5.25 for the washer ). That rubber center gasket is such a good idea! Hmmmmm. What’s up with that?!? I gave it a few good tugs with a 6” socket wrench to seal it. Hopefully it will be as leak-free is the cool rubberized old style. old style is on the left, new style is on the right: 2 Quote Link to post Share on other sites
gstallons 767 Posted January 19 Report Share Posted January 19 Mmmm , you may be able to go to a tradition (as in old) auto parts store and have them find you something . Quote Link to post Share on other sites
80CX100 128 Posted January 19 Report Share Posted January 19 Those washers go by a couple of different names, iirc "Dowty" being one of them. I can't remember where I got my supply, Amazon, MGCycle or the local hydraulic supply shop? fwiw. At $5 each, I'd be sourcing the good ones locally. 1 Quote Link to post Share on other sites
Kane 303 Posted January 19 Author Report Share Posted January 19 Well I found this: https://www.mgcycle.com/index.php?main_page=product_info&cPath=34&products_id=52 That must have been what was there before, rather than the current OEM as mentioned. I guess either will work, but the rubberized one at MG Cycle is less expensive if nothing else. 1 1 Quote Link to post Share on other sites
80CX100 128 Posted January 19 Report Share Posted January 19 I started using those Dowty washers on any plugs that had a tendency to leak or weep oil, ie sump, tranny, diff, but especially the fork drain plugs; they solve a lot of niggly leak problems, fwiw. 2 Quote Link to post Share on other sites
wdietz186 11 Posted January 19 Report Share Posted January 19 Those Dowty washers are great, especially on fittings with pressure behind them. For drain plugs they are a bit of overkill in my opinion. Use of aluminum or copper sealing washers is perfectly fine if you remember they are really only meant to be used once. When you tighten the plug the soft metal conforms to the surfaces of the plug and its seat forming a good seal. The downside to the compression of the washer is the metal work hardens and if reused it requires more torque to make the seal and this will often lead to distortion and weakening of the threads causing them to strip eventually. Aluminum washers are considered to be one use items but copper can be reused if annealed to soften it so it conforms again as long as it hasn't been deformed too much by the previous use. 5 Quote Link to post Share on other sites
po18guy 519 Posted January 19 Report Share Posted January 19 Flip the aluminum washer over next time and use a thin coat of wheel bearing grease on both sides. Never had a leak. 1 Quote Link to post Share on other sites
guzziart 17 Posted January 20 Report Share Posted January 20 I've been buying my crush washers from McMaster-Carr for most of my stuff (bikes & cars). 1 Quote Link to post Share on other sites
Chuck 1,463 Posted January 20 Report Share Posted January 20 ^^^^^^I just received an order of 6061 T6 aluminum from McMaster-Carr aircraft supply. Quote Link to post Share on other sites
docc 3,506 Posted January 20 Report Share Posted January 20 2 hours ago, guzziart said: I've been buying my crush washers from McMaster-Carr for most of my stuff (bikes & cars). I immediately went looking at McMaster-Carr for the "Dowty" (bonded seal) washer, but couldn't find it there . . . Quote Link to post Share on other sites
LowRyter 668 Posted January 20 Report Share Posted January 20 and why is this special crush washer needed? It just looks like another point of failure. Quote Link to post Share on other sites
docc 3,506 Posted January 20 Report Share Posted January 20 A bonded seal washer doesn’t require the torque to “crush” a crush washer ( although it does take much), so will be easier on the sump threads over time. My Sport is still on its original seal washers. Quote Link to post Share on other sites
Chuck 1,463 Posted January 20 Report Share Posted January 20 How about these? https://www.mcmaster.com/sealing-washers/metal-bonded-sealing-washers-6/ Quote Link to post Share on other sites
footgoose 940 Posted January 20 Report Share Posted January 20 On 1/18/2021 at 11:56 PM, Kane said: Well I found this: https://www.mgcycle.com/index.php?main_page=product_info&cPath=34&products_id=52 That must have been what was there before, rather than the current OEM as mentioned. I guess either will work, but the rubberized one at MG Cycle is less expensive if nothing else. Interesting MGcycles calling that a 10528930 and 10mm, when our drain plugs are 10mm and the called for washer is a 10528900 Quote Link to post Share on other sites
footgoose 940 Posted January 20 Report Share Posted January 20 looks like oem was likely the one w/o rubber Quote Link to post Share on other sites
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