Setting torque...

[philcxiv]

Selling my kawazaki 85cc. But before i do that i have to replace the piston. So just now the bikes lying in bits all over the garage floor
because i don't have a torque wrench to set the appropriate torque for the cylinder head and even if i did it would not fit in the small space. If i tighten it up really tight will this do the job or will i have to set the torque using a different method of just get a wrench.

Any help would be great thanks, phil
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[philcxiv] [lucky 14] "I only use the brakes so I can accelerate all over again"
bikepics | ratemybike

[tatters]

stop being a tight git, get a toruqe wrench only £30. if you do the cylinder head bolts up too tight you will snap/shear them, and not tight enthough the head gasket will leak. the same with the cylinder base nuts
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[Jammy-G]

Yeah you have to do them right, otherwise the copper gasket will compress too much and not give a proper seal.

Get a torque wrench and a long reach 1/2 inch drive socket. I used Impact sockets on my cylinder heads, if it doesn't reach use an extender. Definitely worth you getting a wrench though, they are really useful and needed really for proper maintenance jobs.

Just remember though when you do use one, tighten with you hand on the end of the wrench after you've set the torque value, and pull lightly, until you hear some clicks which indicates its tightened enough. It's very easy (on mine anway) to miss the indication and tighten too far.

Edit - You will also need to put the same torque on each of the 4 bolts, because otherwise the gasket will compress a different amount in each place and not form a correct seal.
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

[swampy]

You need a torque wrench to ensure that the mating surfaces are flush and form a good seal. Easy for me to say though, I can borrow my old mans

Mind you, if the bikes in bits, you could tighten it all up before putting the engine back in....
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"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson

[stinkwheel]

If you do not torque the bolts down properly, progressivley and in the correct order, you will warp the cylinder head and it will never seal properly again without remachining. You could always borrow a wrench off someone. If you can't get it to fit somehow, drop the engine.
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[swampy]

Stinky raised a good point there, you need to tighten in the right order, normally that means tightening in diagonal opposites from the inside nut outwards.
____________________
"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson

[stevo123]

Also important is to ensure the threads on the nuts/bolts/studs are very clean and lightly oiled(wd40) but not dripping with the stuff. Make sure there is no water or oil in the holes as this will give a false reading as water and oil do not compress and the wrench will be fooled into thinking the torque required has been met Good luck