This crossbow featured two flat-linked chains, which are connected to a windlass. This chain drive was fitted within a repeating crossbow (like a machine gun? Yes a crossbow machine gun!). Philo described the first ever use of a chain drive. This Greek engineer was also known as 'Philo Mechanicus' (what a great nickname!).

The earliest recorded mention of chain was 2200 years ago in 225BC, by Philo of Byzantium, who was a Greek engineer who wrote about mechanics. Unbelievably, the roller chain has a very interesting history. What makes the timing chain design possible is the type of chain, a roller chain. When lining the marks up “in car” can be tricky

It looks easy on paper doesn’t it? Not bad when engine is out of car and on a stand. Larry was ready for a Saturday night cruise around town. Therefore, after a second tear down I got it right. The marks have to line up exactly as shown with the correct cylinder being on TDC (top dead centre).Įven though I was a novice mechanic at that time, I knew that backfiring through the carburetor is not good. Close is not good enough when setting up valve timing. It is NOT horseshoes or hand grenades, (where getting it close counts). Lesson Learned take extra care when lining up the timing marks as shown in the illustration below. I did learn a valuable lesson after installing a cam, a new timing chain, fresh valve job on the heads. Fuel economy was not a consideration, speed and power were. 50 cents a gallon, or 73p for a gallon of petrol at that time. Larry asked me to put a performance camshaft in the already powerful engine before installing it in the “57”. In those days, I was considered to be the resident mechanic within my circle of friends. The 327 had quickly earned the nickname “Mighty Mouse” for its small block power. He had managed to get his hands on a 327 CID engine, which GM had released in 1962 to “take on” Ford’s 289 CID. A friend of mine owned a 57 Chevy Bel Air, which had come standard with a 283 CID engine. Personally, timing chains have caused me headaches over my entire career.

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Timing chain symptoms