Walneck's Classic Cycle Trader - June 2008 - (Page 44) MONTHLY FEATURES TIP OF THE MONTH At this stage we have an empty primary case, except for the chain adjuster, very easy to change out now and recommended if itʼs worn to any great degree. Many bikes, all unit BSA twins, and many earlier unit Triumph twins have an oil seal on the crank that should be carefully inspected, especially on BSAs. The BSA seal is prone to leaks caused when the sump gets filled with oil, a common BSA issue. When the bike is started with a sump full of oil the excess pressure can dislodge or distort the seal. There are numerous ways to alleviate this problem, ranging from a new oil pump body to an anti-sump valve. If you find problems with the seal and/or signs of leakage, replace the seal. If you donʼt find a seal on your Triumph, check the primary for three tiny holes into the case. If you find them, yours does not take a seal because the engine breathes into the primary where the seal was used on earlier bikes. The holes are there to allow the oil to get back into the sump so that a constant oil level is kept in the primary drive. OK, now we take all the parts to the bench for cleaning and inspection. Weʼll spec the parts and put it all back together next month. Front sprocket is removed with a generic gear puller as shown. Clutch hub is being measured for wear. New one is shown next to it. 44 JUNE 2008 I WALNECK’S CLASSIC CYCLE TRADER® I WALNECKS.COM http://WALNECKS.COM
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