Sump bolt leaking after fitting insert

Auzfest · Renault 5 Driver Joined: 04 Jul 2008 Karma :

Just had insert fitted to sump but it is still leaking , iv noticed the garage fitted a copper washer instead of a crush washer though. Is this likely to be the cause of the leak?

Paxovasa · World Chat Champion Joined: 25 Apr 2010 Karma :

Sound like it is not set to the right Torque (under done)
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Minty · World Chat Champion Joined: 23 Dec 2005 Karma :

Insert? Is that a helicoil? Was it threaded?
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Auzfest · Renault 5 Driver Joined: 04 Jul 2008 Karma :

Paxovasa · World Chat Champion Joined: 25 Apr 2010 Karma :

Minty · World Chat Champion Joined: 23 Dec 2005 Karma :

Back to the garage then fella!
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MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

Auzfest · Renault 5 Driver Joined: 04 Jul 2008 Karma :

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

The insert/thread does just one job, it's there for the sump plug to screw into. It's not in any way designed to be oil-tight as it's a parallel thread, so if it ever is that's just lucky.

The sealing surfaces are the underside of the bolt head, and the face of the boss on the sump in which the thread is cut. The copper washer is what is supposed to seal this joint as it deforms to fill any gaps or roughness.

If the joint is leaking, it's because either the copper washer is to thick or hard for it to deform enough to do it's job. To fix it, you (or they) have a number of choices:

Improve the surfaces the washer is sealing. Quite possibly there is a raised burr from fitting the insert.

Use a washer of a softer material like plastic

Use a thinner washer, that will deform more easily

Anneal the washer you have, to make it softer.
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Ed Case · World Chat Champion Joined: 01 Mar 2009 Karma :

At a 'push' wrap some PTFE tape around the thread before screwing the plug in.

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

dont touch it. Otherwise theyll just tell you to do one for tampering
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Yup, get back in and watch what they do. If I were the kind of dodgy garage that had already sent a "fixed" sump out with a leak, then I'd just back out the plug half a turn, slap some gasket sealant around it, do it up over-tight and hope that it holds for long enough for you to give up and sod off. Or I might have Borstal Baz drain the oil into some manky can full of crud and metal shavings, put a plastic washer on the plug and pour the contaminated oil straight back in.

You paid for a fixed sump and clean oil, you should have a fixed sump and clean oil.
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Auzfest · Renault 5 Driver Joined: 04 Jul 2008 Karma :

Been riding the bike since discovering the bolt was still leaking as it is only a few drips a day and i have kept my eye on oil level but, i noticed after a days riding a weird hissing sound coming from the engine after turning of ignition and immediatly thought to myself "shit i that sounds like oil spraying out of the sump" but there was no indication of extra leakage, any idea what the hissing could be guys im guessing it has to be related to the leak like mayby it was pressure build up in engine venting through the leak ?