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XT600 E 3TB 1992 camshaft clearance
Hi, I'm doing a topend rebuild on my XT600E. It had a blown head gasget where oil was going to the cylinder trough the head. When opening up the motor I saw that the bearing surface was not good anymore on the rocker cover, so I replaced it with a good second hand one. Seen in the pictures. I also inspected the camshaft journals and these are now out of spec.
Therefore my question. Should I run with this just out of spec cam shaft or should I buy a new after marked (new Yamaha is like 300euro) cam shaft to make sure bearing clearances will be ok?
I measured the journals of the camshaft:
Journal close to camchain: 22.962 mm
Journal in middle (3 locations): 22.966 22.975, 22.958 mm
Journal at oil inlet: 22.970 mm
Spec according to service manual is: 22.967 - 22.980 mm
For photo's of camshaft, rocker cover bearing faces and head bearing faces. see link below.
Photos:
https://1drv.ms/f/c/af5074326502f734...icWMmsmWVrkWeA
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Hi, if i understand correct you only replaced one part of top? Its machined togheter and must be replaced as one part.
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I see your point but they do assemble ok. I have already tried to bolt all together and then the crankshaft does turn nicely and free (with some oil off course).
I guess it will be ok?
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Quote:
Originally Posted by Doker
I see your point but they do assemble ok. I have already tried to bolt all together and then the crankshaft does turn nicely and free (with some oil off course).
I guess it will be ok?
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You quess, you dont know how it looks inside after torque down. You will soon know if its not correct, turning around its not the same as correct journal measurements. Good luck!
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post a pic also of the bad rocker cover....
sorry to tell you, but regardless of dimensions, camshaft journals surfaces look like low oil supply already made them rough, they should be should be smooth like the cam lobes.... pass you fingernail over those grooves and you will see what i mean. so your problem is not just the clearance.....
Then, to have an idea if the cam tolerance is ok (with your new cover), use plastigauge, like you do in car crank journals. should be in the 0.02-0.07mm range,
the fact that crank turns free is not telling much....
Last edited by turboguzzi; 2 Days Ago at 08:45.
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