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I've been working on my recently purchased Trailblazer T25 and changed the oils. As per normal for a British bike, it has dripped a little oil since I bought it...nothing out of ordinary. I bought and fitted a new gasket, carefully cleaned all surfaces and in addition used some hylomar when replacing the sump oil filter. I've nipped up the four bolts but oil leaking from the sump oil filter cover is now far worse than it ever used to be. Can anyone offer any ideas as to why this might be?

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Originally Posted by Burga007
I've nipped up the four bolts but oil leaking from the sump oil filter cover is now far worse than it ever used to be. Can anyone offer any ideas as to why this might be?

Either you have over tightened and warped the sump filter plate, or you haven't tightened it evenly enough crazy


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
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1972 Norton Commando 750 "Combat"


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1 , Sloppy prep,
2 pulled threads round studs
3 Buckled cover from previous overtorqueing
4 Poor gaskets ( 2 off required.one either side of the gauze.)

Maybe not 1, probably 2 and 3 , maybe 4


71 Devimead, John Hill, John Holmes A65 750
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Is it possible that the gasket/s you fitted were thinner than normal? Is yours the type with a separate filter screen and plate, or is it all in one? (obviously, the two-piece version has two gaskets). I'm wondering whether lack of spacing due to thin gaskets is enabling the plate to contact the pickup pipe, thereby preventing it seating fully? Just a thought.


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Hi Burga007, Recently I got some sump gaskets & had exact same experience. I used Hylomar & cleaned surfaces well. Studs good, cover was flat.

I noticed on assembly the holes in new gasket were slightly smaller than original gaskets. Still slipped over studs freely. I looked at it giving some thought. My heart told me to enlarge holes but I’d already Hylomar’d the gaskets.

Well it leaked where prior did not. As the gasket fattens it expands slightly. Turns out the gasket hole edge hit studs as it expanded & wouldn’t pinch flat. Enlarged holes on the spares I had as I ordered several. Was good then.

Not saying this is your problem, but it was mine. Sounds like you did the right prep & install.
Don


1973 Tiger 750

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