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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Engine Assembly
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<blockquote data-quote="craig" data-source="post: 148701" data-attributes="member: 1959"><p>Comet engine came apart for a variety of reasons, Oil fouling plug, too much vibration at tour speeds, needs electric start, oil leaks from all sources,</p><p>Decided, due to main shaft damage, 60 year old rod assembly, and bearing fits, to purchase a new crank assembly.</p><p>New barrel fitted to new muff and returned to standard bore.</p><p>Fitted new oil pump. Centered crank using slip on inner races - needed a 0.025 shim on drive side.</p><p></p><p>[ATTACH=full]45974[/ATTACH]</p><p></p><p>Flipped timing side over, heated case half to about 225F, knocked tall spindles down using a nut and brass hammer, slide hammered low spindles up using a G72 long nut. Slide hammer threaded 5/16BSF.</p><p>Replacing OEM steel E212 steady plate with new alloy version. Replaced slightly worn followers with new. Finalized exhaust lifter setting and bent the cotter key after this photo.</p><p></p><p>[ATTACH=full]45975[/ATTACH]</p><p></p><p>My sealant is Threebond 1184, applied a small bead, assembled case halves.</p><p>[ATTACH=full]45976[/ATTACH]</p><p></p><p>Now centering Alton, measuring to decide on crank pinion</p></blockquote><p></p>
[QUOTE="craig, post: 148701, member: 1959"] Comet engine came apart for a variety of reasons, Oil fouling plug, too much vibration at tour speeds, needs electric start, oil leaks from all sources, Decided, due to main shaft damage, 60 year old rod assembly, and bearing fits, to purchase a new crank assembly. New barrel fitted to new muff and returned to standard bore. Fitted new oil pump. Centered crank using slip on inner races - needed a 0.025 shim on drive side. [ATTACH type="full" alt="20211130_CaseHalvesReady1.jpg"]45974[/ATTACH] Flipped timing side over, heated case half to about 225F, knocked tall spindles down using a nut and brass hammer, slide hammered low spindles up using a G72 long nut. Slide hammer threaded 5/16BSF. Replacing OEM steel E212 steady plate with new alloy version. Replaced slightly worn followers with new. Finalized exhaust lifter setting and bent the cotter key after this photo. [ATTACH type="full" alt="20211208_StudsLevelShims1.jpg"]45975[/ATTACH] My sealant is Threebond 1184, applied a small bead, assembled case halves. [ATTACH type="full" alt="20211208_Threebond1184BoltUp1.jpg"]45976[/ATTACH] Now centering Alton, measuring to decide on crank pinion [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Engine Assembly
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