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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
cylinder head brackets
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<blockquote data-quote="Monkeypants" data-source="post: 129962" data-attributes="member: 2708"><p>From Know Thy Beast-</p><p>"All head nuts require careful tightening , especially with the early hollow bolts (cf, chapter 7) which, according to the Instruction Sheets, require 30 lb. ft. and a torque wrench. Even with the later solid bolts, overtightening must be avoided, because owing to the difference in expansion rate of the steel bolt and the aluminium jackets, it can lead to distorted and damaged crankcase bosses. If a torque wrench is available tighten to about 40 lb.ft., otherwise use a short spanner and not too heavy a hand"</p><p></p><p>Given the difference in strength and feel in humans, the last bit about " not too heavy a hand" doesn't mean much to me, especially in a world where torque wrenches are readily available. Many if not most people working on Vincents are enthusiasts, not professional mechanics. Even there, torque wrenches are required on critical parts such as head bolts, wheel studs and a great many other things, if following textbook procedure.</p><p>If everyone had identical strength and sensitivity, hand feel might get you in the ballpark, but that isn't the case.</p><p>If not tightened adequately, the head joint will leak. If overtightened, then damage occurs, and it's not an easy fix.</p><p></p><p></p><p>So if in doubt, it would be safe and precise to use a torque wrench to the figures above.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 129962, member: 2708"] From Know Thy Beast- "All head nuts require careful tightening , especially with the early hollow bolts (cf, chapter 7) which, according to the Instruction Sheets, require 30 lb. ft. and a torque wrench. Even with the later solid bolts, overtightening must be avoided, because owing to the difference in expansion rate of the steel bolt and the aluminium jackets, it can lead to distorted and damaged crankcase bosses. If a torque wrench is available tighten to about 40 lb.ft., otherwise use a short spanner and not too heavy a hand" Given the difference in strength and feel in humans, the last bit about " not too heavy a hand" doesn't mean much to me, especially in a world where torque wrenches are readily available. Many if not most people working on Vincents are enthusiasts, not professional mechanics. Even there, torque wrenches are required on critical parts such as head bolts, wheel studs and a great many other things, if following textbook procedure. If everyone had identical strength and sensitivity, hand feel might get you in the ballpark, but that isn't the case. If not tightened adequately, the head joint will leak. If overtightened, then damage occurs, and it's not an easy fix. So if in doubt, it would be safe and precise to use a torque wrench to the figures above. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
cylinder head brackets
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