elctb Posted June 3, 2008 Report Share Posted June 3, 2008 I can't remove the cylinder off my 315r no matter how hard I try. The cylinder head came off without any problem, but the cylinder doesn't budge. I've hit it with a rubber mallet from every possible angle and it hardly moves. I removed the 4 nuts that hold it down. Is there a trick to removing the cylinder or should I keep hitting it with the mallet ? Quote Link to comment Share on other sites More sharing options...
nzralphy Posted June 3, 2008 Report Share Posted June 3, 2008 Humm You are sure all the bolts are undone??? Try a bit of WD40 on the base gasget overnight to see if it could get it to let go. or you could try putting a filter strap wrench around the cylinder and giving it a tweak in both directions. or the base gasket may go soft with a bit of heat. or put the cylider head back on and Kick it over (quitely) Very very very very last option.... tap a small wedge between the two.... go through the base gasket in a few places (but i didn't tell you this. And i'd work for a week on the cylinder before trying this). Ralphy Quote Link to comment Share on other sites More sharing options...
feetupfun Posted June 3, 2008 Report Share Posted June 3, 2008 Put soft plasticene (oil based modelling clay) in a layer about 6mm thick on top of the piston and refit the head. Carefully bump the cylinder loose by turning the crankshaft. When the gasket joint lets go, take the cylinder head back off and lift the cylinder off the rest of the way by hand. Quote Link to comment Share on other sites More sharing options...
tt5th Posted June 3, 2008 Report Share Posted June 3, 2008 Mine was a swine to do as well. It took a lot of rubber mallet action to get it freed up. Once I had got a crack to appear between the cylinder and crankcase I put a screwdriver in, not as a wedge but as a lever and then malleted the opposite side. Not sure how clever an idea this was but it worked. I had one corner that was particularly stuck. I like the plasticine idea! Quote Link to comment Share on other sites More sharing options...
fastducs Posted June 3, 2008 Report Share Posted June 3, 2008 How about nylon rope instead of plasticine? Move the piston down into the bore, then cut a few feet of nylon rope and coil it inside the bore on top of the piston. Reinstall head, then kick gently as suggested by feetupfun Quote Link to comment Share on other sites More sharing options...
elctb Posted June 4, 2008 Author Report Share Posted June 4, 2008 How about nylon rope instead of plasticine? Move the piston down into the bore, then cut a few feet of nylon rope and coil it inside the bore on top of the piston. Reinstall head, then kick gently as suggested by feetupfun Yes, that's exactly what I did. It took several kicks but it finally came off. Quote Link to comment Share on other sites More sharing options...
elctb Posted June 14, 2008 Author Report Share Posted June 14, 2008 (edited) Is there a trick to install the engine mounting bolts ? After replacing the piston, rings, and installing the cylinder the engine mounting points are not aligned. I can't even bolt on the frame down tubes. It seems to me the only way to do it is to use some sort of a press. I really think it's humanly impossible to force the mounting points to align. I hate taking the bike to the shop to get that done. Any ideas on how to do it ? Edited June 14, 2008 by elctb Quote Link to comment Share on other sites More sharing options...
elctb Posted June 14, 2008 Author Report Share Posted June 14, 2008 Well... after strategically loosening a bolt here and there I was able to make it work. All is good now. Quote Link to comment Share on other sites More sharing options...
elctb Posted June 15, 2008 Author Report Share Posted June 15, 2008 One more things. Does anyone know the torque specifications for the cylinder bolts and head bolts ? I can't find anywhere how tight they should be. I'm using 10 lbs/in for now. Quote Link to comment Share on other sites More sharing options...
tt5th Posted June 15, 2008 Report Share Posted June 15, 2008 It's 8Nm for both. Quote Link to comment Share on other sites More sharing options...
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