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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Liner/muff clearance
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<blockquote data-quote="greg brillus" data-source="post: 90758" data-attributes="member: 597"><p>Barrels are only bored as an assembly never the liner on its own, the liner should not be a tight fit into the case mouth, you should be able to slide the barrel into and out of the cases with hand pressure maybe a light tap with a soft hammer at most. Having said that you also don't want the liners a loose fit or else the rear cylinder oil feed will not be as effective. I do use a torque plate only for the final honing to suit the specified piston clearance...........The barrel/muffs are quite strong and don't tend to distort much, but I have the jig so I use it, and torque the bolts to 30/32 Ft Lb's. This simulates the compressive loads on the barrel when the heads are in place and tightened, remember the head seals on the top of the liner face not the broad alloy face..............Before you do anything further, I would check and make sure that the height of the top hat of the liner is thicker than the depth of the recess in the head.......Otherwise it will not seal.......The difference should Ideally be 2 to 3 thou.......That is the head should measure 0.125" and the liner hat should ideally be 0.128" When all is well, If you sit the head atop the liner/muff assembly, there should be a small gap across the broadface of 2 to 3 thou...............Cheers and good luck................Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 90758, member: 597"] Barrels are only bored as an assembly never the liner on its own, the liner should not be a tight fit into the case mouth, you should be able to slide the barrel into and out of the cases with hand pressure maybe a light tap with a soft hammer at most. Having said that you also don't want the liners a loose fit or else the rear cylinder oil feed will not be as effective. I do use a torque plate only for the final honing to suit the specified piston clearance...........The barrel/muffs are quite strong and don't tend to distort much, but I have the jig so I use it, and torque the bolts to 30/32 Ft Lb's. This simulates the compressive loads on the barrel when the heads are in place and tightened, remember the head seals on the top of the liner face not the broad alloy face..............Before you do anything further, I would check and make sure that the height of the top hat of the liner is thicker than the depth of the recess in the head.......Otherwise it will not seal.......The difference should Ideally be 2 to 3 thou.......That is the head should measure 0.125" and the liner hat should ideally be 0.128" When all is well, If you sit the head atop the liner/muff assembly, there should be a small gap across the broadface of 2 to 3 thou...............Cheers and good luck................Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Liner/muff clearance
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