Paul, replacing the timing gears/chain is not usually called an overhaul as
it is frequently done standalone. However it is usually done as part of an
overhaul. It's a pretty simple process and can be done with the motor in
the car. You are correct about the plastic coated timing gears. My 73
Imperial (now owned by Phil Brust) had many chipped and broken teeth when I
replaced them at about 120K. This process is documented at:
http://imperialclub.com/Yr/1973/Kerrys73saga/73part20.htm
Kerry
----- Original Message -----
From: <RandalPark@xxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Thursday, December 04, 2003 11:48 PM
Subject: Re: IML: IML DIGEST rebuilding 440 in 1968 Crown
> I have a question regarding this topic. It has been stated here that with
only 114,000 miles that it is unlikely that the engine has been over hauled.
>
> Back when they were still quite new, I remember several early 440
Imperials ('66, '67, &'68) experiencing a failure in the timing gears and/or
timing chain right around 100,000 miles. When disassembled, the problem was
usually due to the excessive wear in the synthetic coating on the teeth of
the gears.
>
> I haven't heard much about this on the IML since I have been reading here
since July. I have driven some newer cars that have done this as well, but
at much higher mileage. Has anyone experienced this with their cars?
>
> Paul
>
> In a message dated 12/4/2003 3:21:11 PM Eastern Standard Time,
dardal@xxxxxxxxxxxxxxx writes:
>
> >
> >
> > Quoting Kate Triplett <ad_ablurr@xxxxxxxxxxxxxxxxxxxxx>:
> >
> > > This thread is of considerable interest to me - I have as yet been
unable to
> > > obtain any previous maintenance records for my '68 Crown other than
the few
> > > receipts that "came with" in the glove box. The car does run
splendidly with
> > > nary a ping on 89 octane gas, though, so I suspect the engine has been
> > > through an overhaul once in its life - mileage is now just over
114,000. I
> >
> > With only 114K, its unlikely that the engine was rebuilt, unless it
suffered a
> > catastrophic failure. The factory timing specs were often a bit
conservative,
> > and that might explain why it does not ping. Also, you may not be
advanced all
> > the way to the recommended 8 degrees. Most pinging problems in these
old cars
> > are more likely to be related to deposits due to too much city driving
and not
> > enough high speed.
> >
> > >
> > > Did the dealers do a "warranty" change to these cars when the fuel
changes
> > > took place, or was the timing such that it was strictly after market
> > > rebuilding?
> >
> > When unleaded gas was phased out, the 68 model year was long done with
its
> > warranty.
> >
> > D^2
> >
> >
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