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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank bolts shaking loose
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<blockquote data-quote="1660bob" data-source="post: 32106" data-attributes="member: 366"><p>Hi Howard.No the rubbers are in the correct way.Here is my take on it all:</p><p>I found that when tightening the bolts (at first, when rubbers too tight) the smaller diameter of the rubbers i.e. the outermost bit, compresses, swells and grips the tank bracket, then as the bolt is tighened further the brackets are pulled inwards with the rubber,until the bolt nips up against the shoulder.This bends the whole tank inwards slightly, stressing the whole deal up.The spacer tube at the REAR of the tank would not go between the tabs when the front mounts were tightened, but when i loosened the front mounts, it slipped in easily.The thing with Vinny tanks is that the central section, over the top of the oil tank is so "shallow" in relation to the rest of the structure that they flex and bend like a book opening with surprisingly(alarmingly?) little effort. This discovery made me spend the time setting up the front mount assembly so that there is only the very slightest compression on the rubbers when the bolts are nipped up against the shoulder- the tank is held nicely without any stress (which of course is the whole idea) it cannot move about due to the opposing shoulders on the rubbers and everything is stress free with the bolts securely nipped up on their shoulders. With little or no compression on the rubber, the rubber does not exert any twisting or loosening torque on the bolts because it is not squashed onto them. Ideally,the tank brackets,(are they straight?) fitted with the rubbers the correct way with the larger dia inside, should pass over the bosses in the head stock as a snug sliding fit with no sideways play- if there is i would suspect the tank/brackets to be distorted outwards and correction necessary. It may be that some of the rubbers supplied are more "generous" than they once were, or the washers thicker, bolts shorter or even wear on the counterbore in the headstock,- any or all of these things results in squashed rubbers preventing the bolts from tightening properly, and makes people struggle trying to compress rubbers pushing on the bolts to start the thread- which is were the threads start to get crossed up and stripped ! Set the whole deal up with the absolute minimum of compression on the rubbers, and the bolts will go in with fingers, no struggling, tank will be sitting in stress free repose and bolts will tighten correctly onto their shoulders and be secure I`ll wager, regards, Bob.</p></blockquote><p></p>
[QUOTE="1660bob, post: 32106, member: 366"] Hi Howard.No the rubbers are in the correct way.Here is my take on it all: I found that when tightening the bolts (at first, when rubbers too tight) the smaller diameter of the rubbers i.e. the outermost bit, compresses, swells and grips the tank bracket, then as the bolt is tighened further the brackets are pulled inwards with the rubber,until the bolt nips up against the shoulder.This bends the whole tank inwards slightly, stressing the whole deal up.The spacer tube at the REAR of the tank would not go between the tabs when the front mounts were tightened, but when i loosened the front mounts, it slipped in easily.The thing with Vinny tanks is that the central section, over the top of the oil tank is so "shallow" in relation to the rest of the structure that they flex and bend like a book opening with surprisingly(alarmingly?) little effort. This discovery made me spend the time setting up the front mount assembly so that there is only the very slightest compression on the rubbers when the bolts are nipped up against the shoulder- the tank is held nicely without any stress (which of course is the whole idea) it cannot move about due to the opposing shoulders on the rubbers and everything is stress free with the bolts securely nipped up on their shoulders. With little or no compression on the rubber, the rubber does not exert any twisting or loosening torque on the bolts because it is not squashed onto them. Ideally,the tank brackets,(are they straight?) fitted with the rubbers the correct way with the larger dia inside, should pass over the bosses in the head stock as a snug sliding fit with no sideways play- if there is i would suspect the tank/brackets to be distorted outwards and correction necessary. It may be that some of the rubbers supplied are more "generous" than they once were, or the washers thicker, bolts shorter or even wear on the counterbore in the headstock,- any or all of these things results in squashed rubbers preventing the bolts from tightening properly, and makes people struggle trying to compress rubbers pushing on the bolts to start the thread- which is were the threads start to get crossed up and stripped ! Set the whole deal up with the absolute minimum of compression on the rubbers, and the bolts will go in with fingers, no struggling, tank will be sitting in stress free repose and bolts will tighten correctly onto their shoulders and be secure I`ll wager, regards, Bob. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank bolts shaking loose
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