Lucked out big time

Post #375,772 by hnick 6/2/13 5:26:58 PM Reply	Lucked out big time Usually when a timing chain goes, a valve is left down and a piston comes up. There are two objects competing for the same space in a tightly machined environment. The fragmented pieces recirculate while the crank is intact. Possibly not described as "pretty"...
Post #375,780 by pwhysall 6/2/13 7:16:06 PM Reply	Depends... ...on whether the engine is an "interference" design or not.
Post #375,785 by Another Scott 6/2/13 7:38:13 PM Reply	OHC engines are less forgiving, too. Some bent pushrods in, e.g. a GM V8, are relatively easy to recover from, but camshaft lobes don't bend too easily... (GM V8s in the '70s often had nylon-coated gears to drive the timing chain - they were quieter than metal-to-metal designs. But if the car ever overheated, the nylon would crack and fall off, leading to chain slippage. If it slipped enough, then ...) Cheers, Scott.
Post #375,790 by folkert 6/2/13 9:32:44 PM Reply	Been there done that... Swapped the gears out for Double Roller... which where also quieter than the nylon gears and chain with slop. -- greg@gregfolkert.net PGP key 1024D/B524687C 2003-08-05 Fingerprint: E1D3 E3D7 5850 957E FED0 2B3A ED66 6971 B524 687C
Post #375,794 by Another Scott 6/2/13 11:16:21 PM Reply	Yup. It was a fairly easy fix, too, as those things go. It was satisfying to see the timing mark actually move smoothy with increasing RPM rather than jump around +/- 5 degrees or more at idle... :-/ Cheers, Scott. (Who is glad he doesn't have to mess around with stuff like that any more though.)

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