Hey guys, so today i threw a head on my m42. prior to this I did some block work including new rod bearing and main bearings, also bored out the cylinders to 86mm to fit bigger pistons. The crank and pistons moved freely with the head on but as soon as i hooked up the timing chain its a bitch to move. All the timing is set to tdc as well. I can put some good force on it to get the crank to move slightly but it seems way to hard for it to be normal. Btw the cams were exposed inside the head for about a month before this would that have some cause for it
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A moderate increase in the torque required to turn the crank by hand is expected when putting the timing chain on with the head, but it should not feel overwhelmingly difficult. I would check to make sure that the cams and crank are not 180 degrees out of phase. When you say all is at TDC, you mean that cylinder 1 is all the way up and the cam loves for #1 are pointing "up & in"? -
Had the head checked for bent ness? If the head was overheated it might be bent, and now the camshaft doesn't spin like it should.Comment
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Yes that is correct the cams lobes are facing each other in a 45 degree angle like they should and the pistons are up in cylinder 1Originally posted by bmwman91 View PostComment
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Are you turning the crank in the proper direction (normal engine rotation direction)? Trying to turn it backwards will often cause the chain to disengage the crank sprocket and get jammed up in the lower guide.Comment
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got the cams to move . ended up the chain was binding up on the idle sprocket, thanks for all the replysComment
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