Post #375,755
6/2/13 9:55:38 AM
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Interesting. Seems not much is going on in Rapid City, SD.
Smart people out there. ;-)
Thanks.
Cheers,
Scott.
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Post #375,759
6/2/13 1:18:54 PM
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I had a car that broke its timing chain
on the interstate leaving there a while back. Stuck 2 days while the dealer rushed the part retrieval and repairs to lessen our pain.
Satan (impatiently) to Newcomer: The trouble with you Chicago people is, that you think you are the best people down here; whereas you are merely the most numerous.
- - - Mark Twain ÂPuddÂnhead WilsonÂs New Calendar, 1897
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Post #375,761
6/2/13 1:24:36 PM
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Wow... it wasn't fatal to the car?
Timing chain failures are usually good for putting the engine into the passenger seat for a rest after it finishes beating the snot out of itself.
Regards, -scott Welcome to Rivendell, Mr. Anderson.
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Post #375,769
6/2/13 4:32:17 PM
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fortunately not
it was a 4 cylinder Toyota and when the chain snapped we coasted to a stop, even though we kept mashing the gas pedal to get back up to speed.
Satan (impatiently) to Newcomer: The trouble with you Chicago people is, that you think you are the best people down here; whereas you are merely the most numerous.
- - - Mark Twain ÂPuddÂnhead WilsonÂs New Calendar, 1897
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Post #375,772
6/2/13 5:26:58 PM
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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"...
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Post #375,780
6/2/13 7:16:06 PM
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Depends...
...on whether the engine is an "interference" design or not.
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Post #375,785
6/2/13 7:38:13 PM
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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.
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Post #375,790
6/2/13 9:32:44 PM
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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
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Post #375,794
6/2/13 11:16:21 PM
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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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