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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!elroy.jpl.nasa.gov!nntp-server.caltech.edu!hacker
- From: hacker@cco.caltech.edu (Jonathan Bruce Hacker)
- Subject: Re: Timing Belt revisited
- Message-ID: <1992Aug31.053442.19223@cco.caltech.edu>
- Sender: news@cco.caltech.edu
- Nntp-Posting-Host: punisher
- Organization: California Institute of Technology, Pasadena
- References: <59977@mimsy.umd.edu>
- Date: Mon, 31 Aug 1992 05:34:42 GMT
- Lines: 40
-
- jsw@umiacs.umd.edu (Jeff Webber) writes:
-
- >(1985 Toyota Corolla GTS, DOHC 16v 1.6l same engine as 80's MR2's)
-
- >Last week my timing belt apparantly broke on my above car.
- >Since someone posted that all toyotas made after a certain year
- >had freewheeling engines I decided to do the repair myself.
-
- >I think the timing belt broke as a result of some other engine
- >failure.
-
- >When timing belts break do they normally break by splitting somewhere
- >or do they lose a bunch of teeth in one area? I ask as my belt had
- >its teeth torn off by the crankshaft. I believe that something
- >caused the belt to stop moving (something caused a camshaft to stop
- >turning). And thus the teeth were stripped off. The belt didn't
- >look bad otherwise.
-
- When the timing belt on my dohc supra broke, all the teeth contacting
- the crank pulley were stripped off. Since this pulley is the
- smallest, it is where the most "stress-per-tooth" occurs. It is much
- less likely that the belt would actually break since it consists of
- many thin wires bound together inside the rubber which makes it very
- strong logitudinally. Put your used belt around a car jack and see
- how much force it can take (wear some protection if you do try this).
-
- >I replaced the belt and lined everything up according to the service
- >manual but the engine does not run (well it barely runs but I don't
- >count the horrible noises its making as running).
-
- A lot of 4 valve per cylinder heads are not free-wheeling. I'm not
- sure if yours falls in this category though.
-
-
-
-
- --
- Jon Hacker
- Caltech, Pasadena CA
- hacker@tumbler-ridge.caltech.edu
-