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| Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions. |
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#1
2 Nov 2010
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xt600 cylinder head & cam worn
Hi to all (just joined 2day)
Help needed with 1985 xt600 C reg recently purchased bought it with a nasty top end noise (metallic rattle) have stripped the top off, the cam + journals are scored and dont look good so i think it needs another head / cam etc unless anyone can tell me otherwise ? The question is the frame / engine nos. are 43F but the head are cylinder are 34L is this right or is it a problem or are the parts interchangeable? 
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#2
3 Nov 2010
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forgot to say if anyones got a complete head ? let me know
thanks
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#3
3 Nov 2010
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heads up
Yes, the parts are interchangeable - see earlier posts of the intricacies of Yammie part numbering.
How badly scored are the bearing surfaces. They tend to look pretty bad before they are actually shot. Does the camshaft have play when installed? Bad camshaft is also usually a sign of bad or no lubrication, and then normally first the piston goes. You sure that is not the problem? If they really are bad, you could get a machine shop replace the bearing surfaces in the head / cover with steel shells and use a replacement camshaft (second hand). Might have one lying around, but I'll only know in a week or two.
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#4
3 Nov 2010
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pics
Hi thanks for the reply i have just uploaded some pics to show the scoring dont know about the piston yet as i havent taken the head off yet.
As for the lubrication im with you i think it was lack of maintenance oil & filter were very dirty  
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#5
4 Nov 2010
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Not new, but might still work ..
It does not look too bad, indeed some scoring but not over teh whole bearing surface. Should it be bombproof after repairs or can you take some slight chances? That is, you do not want to be stuck in the middle of Congo with a broken camshaft.
I'd first check piston / cilinder and cam chain - those are the parts that rattle if worn. I actually would not know what noise a camshaft would make. I also notice an enormous amount of liquid gasket on the mating face cover / head. The 2 are supposed to be joined metal-to-metal with only a very small amount of liquid gasket. Reason is, the 'bearings' for the camshaft are drilled like that, so that state should be copied at reassembly. Success!
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#6
6 Nov 2010
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Aukeboss when you say
"I also notice an enormous amount of liquid gasket on the mating face cover / head. The 2 are supposed to be joined metal-to-metal with only a very small amount of liquid gasket. Reason is, the 'bearings' for the camshaft are drilled like that, so that state should be copied at reassembly." there is actually a gasket in amongst all that sealant ? but what you say does make sense Engine is now stripped indeed the piston is quite badly scored and the cylinder bore has some wear so i think it will be a new piston and rebore also the cam chain adjuster is on full adjustment Attachment 4052 Think i found what may of caused the bad lubrication some runny chewing gum like sticky substance in the bottom of the engine think it was maybe like some kind of leak stopper or something but it probably blocked it all up Attachment 4053 also have tried searching earlier posts for the intrices of the engine numbering but no joy do you know would a 3AJ cylinder fit thanks
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#7
6 Nov 2010
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  dont think the pics came out in prev post
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#8
6 Nov 2010
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a gasket?!
There should definitely NOT be a gasket there, or you have a version from out of space. Just remove all the goo, and install camshaft in the head and the cover on the head. Camshaft should turn easily. Little test should confirm my statement. Might also be the cause of your lubrication problem: the gap between camshaft and bearing increased, increasing oil flow to the head and thus reducing oil flow to other parts.
Plus the white goo thing off course. I'd just take the whole engine apart now, since that hardly increases the cost, and you'll be able to clean everything thoroughly. You will of course see the gears which might also need replacement, etc. The noises you heard were definitely piston / cilinder and / or cam chain. That's good news for the cam shaft and head! 3AJ cilinder fits on this engine. Yes, it will fit on the lower end, but will the head fit onto it? The 3AJ cilinder has 2 bolts at rear and front end of the cam chain tunnel, the earlier version has only one. I'd just do the rebore, more effective than installing a cilinder with unknown history etc.
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#9
18 Nov 2010
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new parts ?
ok so i have got a replacement top end from a 1984 TT600 ? the head is marked 1KJ its in perfect condition as is the cam result! the cylinder is marked 3AJ its aluminium with nikasil (are they all like this) its slightly worn and scored the piston is worse
I have tried the new head on the original cylinder 34L but it doesnt fit? the 2 bolts dont line up is it worth replating and new piston the 3AJ cylinder or should i try and get a head to fit the 34L cylinder which is better? thanks
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