mcferreira100 Posted February 16, 2015 Author Share Posted February 16, 2015 I`m wondering why is there any paint under there at all? Link to comment Share on other sites More sharing options...
slice Posted February 16, 2015 Share Posted February 16, 2015 Did they paint it "to look nice"? do you think. Might be the reason you had a leak, just guessing here but I would clean all that crap off before I rebuilt it. Does the old gasket have a sort of sealant or black paint finish? Link to comment Share on other sites More sharing options...
mcferreira100 Posted February 16, 2015 Author Share Posted February 16, 2015 Seems to have a black paint finish. Can I clean the head with Acetone? Link to comment Share on other sites More sharing options...
slice Posted February 16, 2015 Share Posted February 16, 2015 Don't see why not it's not going to effect the metal and it might get the crud off, I would try paint thinners first tho. Link to comment Share on other sites More sharing options...
blackhat250 Posted February 16, 2015 Share Posted February 16, 2015 After cleaned " inspect it for a hairline crack,,, this would open when hot, and compression escape into the waterways, I had a van that when turned over with starter the compression bubbled out the expansion bottle [ cap off bottle ] Link to comment Share on other sites More sharing options...
mcferreira100 Posted February 18, 2015 Author Share Posted February 18, 2015 Ok I see now the head gasket in 3 parts..there was still part of the gasket attached to the head. My mechanic friend came to have a look today and noticed one of the head bolts pretty rusted indicating water getting to it. He says this indicates a possible crack in the head in that area? so he reckons I might need to replace the head..not happy. Is there any other options? Link to comment Share on other sites More sharing options...
slice Posted February 18, 2015 Share Posted February 18, 2015 I suppose you could get it welded but would always be on your mind and it might cost more than a 2nd hand one. To be honest mate I would get another one rather than faff around with one you know is cracked. Just my opinion you understand. Link to comment Share on other sites More sharing options...
mcferreira100 Posted February 18, 2015 Author Share Posted February 18, 2015 See one on Ebay for 49 Euro from Germany..not bad..amazed to see any there at all.But after speaking to guy who did my engine he reckons he`s seen lot of rusted head bolts as those bikes tend to stand long time and water seeps past the gasket. He assures me the head is fine. Link to comment Share on other sites More sharing options...
slice Posted February 18, 2015 Share Posted February 18, 2015 In that case you could get it pressure tested, don't ask me how? and see if it does in fact have a crack in it, seems to be your best option mate plus it would save you some money and put your mind at ease as to it being in tip top condition. Link to comment Share on other sites More sharing options...
mcferreira100 Posted February 18, 2015 Author Share Posted February 18, 2015 Ah screw it Slice..gonna put it back together using the high temp gasket maker as the guy insisted I should do (for older bikes) and if it gives me any more crap its going in the want ads. Will rather get an air cooled four stroker anyway..don`t like having to rev the nuts off these old bikes. Link to comment Share on other sites More sharing options...
slice Posted February 18, 2015 Share Posted February 18, 2015 That's a plan mate, just a bit of a bugger when you have done all that work on it ! Link to comment Share on other sites More sharing options...
mcferreira100 Posted February 18, 2015 Author Share Posted February 18, 2015 Slice..this the gasket maker I`m told to use..pretty expensive stuff Head looking lot different after I realized stil a gasket on there and sum paraffin cleaning Will give plugs bit of a wire brush clean too. Link to comment Share on other sites More sharing options...
slice Posted February 18, 2015 Share Posted February 18, 2015 Don't like the idea of putting sealant on a cylinder head the gasket should do the job on it's own without the extra stuff. if you used it JUST where the water ways pass through then that might work but as I said not to keen on slapping it on all over! Still you have talked to your mate and he says it's fine so go with someone who knows what he's on about. Good luck Mc hope it works out ok. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted February 18, 2015 Moderator Share Posted February 18, 2015 wasn't there some type of blue dye which detects cracks in alloy? maybe this http://weldingsupplies.dynaflux.com/category/-i-crack-check-i-non-destructive-testing Link to comment Share on other sites More sharing options...
slice Posted February 18, 2015 Share Posted February 18, 2015 Nuclear grade cleaner !!! Hells teeth Drewpy. Link to comment Share on other sites More sharing options...
KevtheRev Posted February 18, 2015 Share Posted February 18, 2015 Hmm , I've never used that stuff on an LC head . If you do use it , will you use the gasket as well ? When using that stuff don't squeeze it on like toothpaste as I've seen people do when using it on clutch/magneto/waterpump covers , on a 4stroke it blocks the oilways very quickly and depending on which colour used can make your engine oil look very pretty as the lumps get chewed in the gears . Better to put a tiny bit on your finger and lightly coat the mating surface . If you spit on your finger first it works better ( ahem ) . A thin film's all you need . I'd rub the mating surface of the head on a piece of plate glass with some fine emery paper taped to it and try a new gasket first though . With your bike stripped already it's a 5 minute job . Nothing wrong with those bolts that a squirt of oil wont sort out . Link to comment Share on other sites More sharing options...
Moderator drewpy Posted February 18, 2015 Moderator Share Posted February 18, 2015 Nuclear grade cleaner !!! Hells teeth Drewpy. aye, what's good for Sellafield... Link to comment Share on other sites More sharing options...
blackhat250 Posted February 18, 2015 Share Posted February 18, 2015 There is additives nowadays that seals poreus heads , works well too , if the gasket dosnt work ,, Link to comment Share on other sites More sharing options...
mcferreira100 Posted February 20, 2015 Author Share Posted February 20, 2015 Head back on today..torqued to 22ft pd. Started and let idle itself hot then let it cool after which re-torqued to 25. Also tried slightly thicker washers on the head bolts in case things are bottoming out. Carbs also set leaner (2nd notch from top). Took it for a spin and so far all is well..fluid in reservoir not rising. Will go for longer ride tomorrow..weather permitting. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted February 20, 2015 Moderator Share Posted February 20, 2015 sounds like a result Link to comment Share on other sites More sharing options...
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