Leak down test spark plug

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Mrnice71
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Sat May 26, 2018 8:57 am

Hi guys ,any good ideas on sealing the spark plug in a leak down test ? got a small leak .Need to address this permanently also

holty
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Sat May 26, 2018 9:10 am

have you tried tightening it a bit more, the aluminium crush washer should seal it unless your head has a defect, maybe try a new plug, could try a little bit of silicone around the washer, but not too much you might seal it in for good,

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ForemanBob
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Sat May 26, 2018 12:51 pm

I'd try a new plug an crush the washer down to suit.

Failing that a little grease to try to create a seal...

But if its that bad i'd be looking to get the seat machined flat..

Mrnice71
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Sat May 26, 2018 2:39 pm

Its a brand new head and new spark plug guys , manages to seal it with a fibre washer while l do the test which it passed :)

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garry inglis
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Sun May 27, 2018 4:18 pm

when i built my ts1 engine i put the champion plug in that rayspeed recommends and did my leak test all ok apart from that plug changed to ngk and no more leak never used a champion since

Mrnice71
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Sun May 27, 2018 8:34 pm

garry inglis wrote:
Sun May 27, 2018 4:18 pm
when i built my ts1 engine i put the champion plug in that rayspeed recommends and did my leak test all ok apart from that plug changed to ngk and no more leak never used a champion since
This was a NGK Gary .

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garry inglis
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Mon May 28, 2018 6:07 am

Try a another plug and test and when that's ok test another one and keep as a spare as once engine is in the bike we really don't test them anymore

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