Sump Crush Washer

[kirky19]

Can anyone tell me if there is a right way for the crush washer to be installed on sump plug. Does the flat side face the sump

[herulach]

they're usually flat. If its got a step then thats cos its been crushed. Get a new one, they're all of 10p.
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YBR 125>FZS600

[unitynotsocri...]

dont think it matters,as long as it reatins it's spring to stop vibration rattling the sump plug loose.I'd put it on with the outside curve touching the sump plug hole if i thought it needed extra grip,as previous poste said,any washer will do but it's spring steel for a reason....vibration.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[weasley]

A crush washer is the exact opposite of spring steel. It is a soft alloy and is not to prevent vibration-loosening but to seal the sump plug. The soft alloy crushes to fit the small imperfections in the surfaces between the plug and the sump. Once used, it will not crush effectively again, hence why you should always use a new one.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[unitynotsocri...]

Thanks Weasly,thats solved a 30 year mystery on my old hondas,my sump washers are made of copper! I stand corrected,if leaning to one side still,cheers.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[kestrel]

[Rogerborg]

In extremis, I have used a piece of rubber inner tube with a hole in it.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[kirky19]

Thanks everyone
I double checked with a two dealers for Yamaha who advised flat side of crush washer faces sump and the convex side towards sump nut

[stinkwheel]

I stopped using crush washers a while ago.

I use bonded seal dowty washers now. Perfect seal every time and no need to tighten them to within an inch of their lives. They are also re-useable.

My totally oiltight Enfield bullet is testament to their effectiveness.
https://www.speedflowshop.co.uk/ekmps/shops/speedflow/images/513_08.07.jpg
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[neil.]

[stinkwheel]