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Post by atshed on Jun 17, 2015 6:16:25 GMT
hi to all, just recently I have noticed a v small amount of oil appearing from around the head gasket. when engine was rebuilt , the following were checked and rechecked by myself - torques, surfaces (glass flat), all free from dirt /oil/grime etc.gasket used was cometic type. I have heard that gsx11's were a bit prone to this , but wondered if over the last 34years anyone has come up with any sensible solutions. Head is coming off shortly for new valve guides and valves - so an opportunity for a cure me thinks. I did initially try just nipping up the head bolts/nuts but did not seem to make a difference. thanks in advance .
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Post by quazi on Jun 17, 2015 6:21:26 GMT
Important to fit new o rings to the studs (if model required) but I had a cometic gasket blow on me last year. I changed to a wiseco multi layer steel now, so far no problems what so ever. Not sure the fibre based are up to it any more.
You could try that, or any other MLS option.
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Post by atshed on Jun 17, 2015 7:38:51 GMT
no o rings. opted away from the metal gasket as I was advised by some before mentioned idiots not to use them. how long have you had the gasket in? cheers
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Post by kitkatman on Jun 17, 2015 9:32:46 GMT
I fitted a spring steel head gasket to my ET a few years ago, started it ,oil all over engine. The fault was the outer stud hole which returns the oil from the head. They had not put a raised ring around this hole, thus oil runs out. Problem has been solved now but still prefer composite gasket, but I always renew the 2 rubber o rings. Hope this is some help.
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Post by atshed on Jun 17, 2015 10:54:36 GMT
I fitted a spring steel head gasket to my ET a few years ago, started it ,oil all over engine. The fault was the outer stud hole which returns the oil from the head. They had not put a raised ring around this hole, thus oil runs out. Problem has been solved now but still prefer composite gasket, but I always renew the 2 rubber o rings. Hope this is some help. the sweating is all round. pins all good - one each end. yep the two o rings ( under centre bolts ) are all good. thanks though.
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Post by katana on Jun 17, 2015 11:42:43 GMT
Not sure the fibre based are up to it any more. You could try that, or any other MLS option. Strange comment ! ! ! Suzuki saw fit to use them and its lasted 30+ years so why would they be any less capable? MLS good for modern alloy heads to alloy barrels and water cooling - old tech gaskets for old tech engines IMHO! |
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Post by quazi on Jun 17, 2015 11:49:09 GMT
Not sure the fibre based are up to it any more. You could try that, or any other MLS option. Strange comment ! ! ! Suzuki saw fit to use them and its lasted 30+ years so why would they be any less capable? MLS good for modern alloy heads to alloy barrels and water cooling - old tech gaskets for old tech engines IMHO! I was referring to Cometic specifically fella, as that what was posted plus my experience/use not general road use. |
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Post by quazi on Jun 17, 2015 11:51:37 GMT
no o rings. opted away from the metal gasket as I was advised by some before mentioned idiots not to use them. how long have you had the gasket in? cheers
All last season and a bit of this years, so far all good. Only my experience though, not suggesting it's good for all. |
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Post by atshed on Jun 17, 2015 13:45:59 GMT
no o rings. opted away from the metal gasket as I was advised by some before mentioned idiots not to use them. how long have you had the gasket in? cheers
All last season and a bit of this years, so far all good. Only my experience though, not suggesting it's good for all. its ok I wouldn't criticize an opinion.  thanks for your input. I must admit the cometic gasket I put on the sump plate leaked also - I threw it away and put on a cheaper Athena one - never leaked since on both the 7/11 and 750. the 750 had a cheap pattern part head gasket - never leaked also . compression similar on both bikes 170 ish. maybe I had I bad batch of cometic ??
the gsx1100 spec pros and cons also mentions how the 1100 is prone to sweating . hmmmmm any other experiences from others  ?
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Post by arnout on Jun 17, 2015 20:24:36 GMT
Missing some vital info: - What engine (cylinder head)? - What Cometic head gasket? - At what position is oil leaking/sweating? - Have the head and/or block been skimmed? Stock cylinder block or resleeved? - Did you use any extra sealant? If so, at what positions? the sweating is all round. pins all good - one each end yep the two o rings ( under centre bolts ) are all good. It seems highly unlikely to me a failing gasket would leak oil uniformly around its edge, especially as it comes into contact with oil only at the cam chain tunnel and the oil bores and studs on either side of the block.. The o-rings on the GSX1100 (1074cc) head are fitted onto the barrel type cylinder nuts.. (not under these center nuts..) Such a failing o-ring would allow oil to spread out horizontally along the front of the cylinder head, perhaps making it look like the gasket is seeping out oil.. So just to be able to eliminate it from the list it is handy to fit new o-rings next time..  |
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Post by atshed on Jun 17, 2015 20:52:43 GMT
Missing some vital info: - What engine (cylinder head)? - What Cometic head gasket? - At what position is oil leaking/sweating? - Have the head and/or block been skimmed? Stock cylinder block or resleeved? - Did you use any extra sealant? If so, at what positions? the sweating is all round. pins all good - one each end yep the two o rings ( under centre bolts ) are all good. It seems highly unlikely to me a failing gasket would leak oil uniformly around its edge, especially as it comes into contact with oil only at the cam chain tunnel and the oil bores and studs on either side of the block.. The o-rings on the GSX1100 (1074cc) head are fitted onto the barrel type cylinder nuts.. (not under these center nuts..) Such a failing o-ring would allow oil to spread out horizontally along the front of the cylinder head, perhaps making it look like the gasket is seeping out oil.. So just to be able to eliminate it from the list it is handy to fit new o-rings next time.. o rings are fine as I said ( new were fitted) - center bolts/barrel nuts . I said under when I meant to say "on" no sealant used gsx1100ex lump taken to 1168 wise original sleeves as far as I know cometic gasket to suit 1168 - 75mm (not copper) head and block skim - not to my knowledge as I pointed out - surfaces are flat as. leak areas are either end and middle front and back - gasket looks to be sweating all round.
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Post by atshed on Jun 17, 2015 21:14:08 GMT
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Post by katanamangler on Jun 18, 2015 6:53:39 GMT
Did you re- torque after a a couple of heat cycles? You would be amazed sometimes how much they need after it has done just 50 miles. Did you torque to the original settings? You can afford to go a little higher.
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Post by atshed on Jun 18, 2015 12:23:46 GMT
Did you re- torque after a a couple of heat cycles? You would be amazed sometimes how much they need after it has done just 50 miles. Did you torque to the original settings? You can afford to go a little higher. Yep torqued to original . Then checked after 100 miles . Were still at right torque , then went 1/5 further round to pinch . Perhaps I could have gone 1/3 round but was in fear of stud shear . Am thinking once I have new valves and guides in I shall pinch the extra 3rd . |
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Post by atshed on Jun 18, 2015 12:27:26 GMT
I have meantime managed to source a wiseco gasket - with luck this will help .
Will update in a couple of weeks once all parts are in place and first run complete .
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