| 摘要 |
This specification discloses apparatus for locking and retracting the timing chain(s) or belt of overhead cam internal combustion engines. The apparatus consists of essentially two components; an adjustable Retractor and a spring loaded Lock. During maintenance and/or overhaul of the engine and following removal of the Rocker Arm Cover(s), the Lock is compressed and installed between the two sides of the timing chain and seated on top of the crank sprocket. Upon release, the spring of the Lock forces the two sides of the lock to expand and lock the timing chain into position around the crank timing chain sprocket and prevents the engine mounted timing chain tensioner piston from jumping out of detent and falling into the engine oil pan. Utilization of the Lock in the foregoing manner allows for the removal of the engine head which contains the overhead cam and upper timing sprocket without necessitating the removal of the engine front cover, fan, and oil pan. Following removal of the engine head the Retractor is installed at the front of the engine block using two of the engine head bolts to secure the Retractor in position on the two front head bolt holes of the engine block. The cam sprocket is then installed on the Retractor and the Retractor adjusted to tension the timing chain. Upon tensioning of the timing chain, the Lock may be removed, chain tension now being sufficient to maintain the engine mounted timing chain tensioner piston in position and the timing chain secure around the crank sprocket.
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