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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: JohnG_68 on December 11, 2017, 11:41:16 AM
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Does anyone know to what degree the two nuts on each camshaft bearing bolt should be tightened. I took them all off and when I put them back on I think I may have overtightened them because the bike wouldn’t start. I did so just enough so that each end of the cap would make contact with metal. Thanks.
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I take it you don't have a manual, the torque settings will be in there...
When you say won't start, do you mean the engine won't turn over or it won't fire? If it won't turn you may have put the caps back in the wrong places, or the wrong way round.
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I take it you don't have a manual, the torque settings will be in there...
When you say won't start, do you mean the engine won't turn over or it won't fire? If it won't turn you may have put the caps back in the wrong places, or the wrong way round.
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It wont turn but I’m petty sure I’ve put them in their correct places
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If it's Iocked up I think the caps being in the wrong places or wrong way round is a good bet. Unless you've done anything else?
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Did you turn the engine by hand before you zipped it all up?
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Did you clean it and apply a coating of oil? I know with some engines the caps were marked in order to help when assembling. sometimes it was a series of centre punch marks or lines or some were numbered. I'm am not sure if Bricks are done this way, but I am sure somebody has been down this track. When you do sort it out the caps need to be tensioned correctly.
Regards Martin.
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Even when I first took the cover off I couldnt turn either shaft. The chain just wouldnt budge for whatever reason. The caps are numbered on bricks and deductively I found which go where and all that. I also found they need to be torqued to 80 in lbs 10nm but I don’t have a torque wrench that low...
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Try Harbour Freight for a tension wrench $20.00 US. Hopefully you haven't over torqued them. With the bike on centre stand and the spark plugs removed can you rotate the engine by hand.
Regards Martin.
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Even when I first took the cover off I couldnt turn either shaft. The chain just wouldnt budge for whatever reason.
Your bike's engine had a minor clicking sound that some described as maybe random spark discharge. It was running before you got involved with the camshaft. How did you determine the camshaft had anything to do with the clicking? If the transmission was in neutral, the camshaft should have rotated easily. That was to the time to stop and reconnoiter. Is the transmission in neutral? If it was and the bike was running before you did this, in which direction were you trying to rotate the shaft—clockwise or counterclockwise as viewed from the front of the engine?
This sounds like intuition run amok, not an uncommon occurrence here. It's probably happened to most of us. :giggles
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I took them all off
I just have to ask. Why?
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It wont turn but I’m petty sure I’ve put them in their correct places
What happened when you pressed the starter button—no clicks or buzzes—just an ominous silence?
The cam chain tensioner, sprockets and chain would be removed before the camshaft mounting bolts were to be loosened. Did you do that? If not, now you should disassemble those parts then reassemble everything by bolting the camshaft correctly into it mounts, then reinstalling the chain, tensioner and gears with their correct timing.
You should have a manual. There's a downloadable one in the Repair Guidance section.
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It appears that you have no manuals for your bike. Without a manual how did you determine how to reinstall the cams so that they were timed correctly with the crankshaft and the pistons?
If I am not mistaken, the valves reach into the piston stroke so, if not properly synchronized, they can contact the top of the piston.
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The sound I heard was coming from somewhere near the cylinder heads so I figured the cam was misaligned. I checked the sparks at night and they’re all good. I got a proper torque wrench and put everything back together but when I tried to start the bike it failed again... The fuel rail made noises as it usually does and a few other sounds occurred but it would crank up. I’m lost, help me
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John, we're struggling to help you here without really understanding what you have done.
So the bike was running but making a noise and you took it apart to investigate, is that right ?
Can you explain what you took off, and what the sequence was to put it all back ?
Also, have you checked that the cam bearing caps are in the right places on the cylinder head, and fitted the same way round as when you took them off ?
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+1 :dunno