Re: [Chrysler300] Fw: [FWDLK] Engine knock

["Owen & Jo Grigg" <ram300@xxxx>]

Thanks to all that helped out with suggestions on the cause of an engine
knock in a friends '57 Fury motor.
Turned out to be a piston skirt to crank countershaft clearance problem, as
the pistons heated up the minimal clearance closed up as well, contacting
each other. Ouch! So much for the "reputable" engine builder!
Owen

>
> A few weeks ago I started up my fully rebuilt 57 Fury V-800 318 for the
first time, which is installed in my rebuilt Fury chassis with Torqueflite
trans.
> First impressions were good news, except for an engine noise that at first
sounded like it was coming from the fuel pump area. However after trying
other fuel pumps, and then investing in a mechanics stethoscope, it was
apparent that the noise was actually coming from the sump, and there is
absolutely no noise whatsoever coming from the head area. And the noise was
getting worse the longer I ran the engine.
> I have run the engine a total of 3 times, on seperate days, and every
time, the engine purred like a kitten on initial start up, sounds perfect,
and then the noise comes along after about 30 seconds.
> I had the engine rebuilder come and listen, and again it ran real smooth
for 30 seconds until the noise started, and then we ran it for maybe 2
minutes while he was tring to figure out where the noise was coming from. We
removed plug leads hoping it would tell us which cylinder was the problem,
and this did not make the noise go away. By this time the noise was sounding
real nasty, so we shut it down and agreed that the engine had to come out
for inspection.
> Prior to initial start up I had 40 pounds pressure on cranking, and then
65 pounds when running.
> My sump plug has a magnet, and when I drained the oil there was nothing
apparent on the magnet.
> The rebuilder removed the sump the following day, and the worst news of
all is that there is nothing visible wrong with the engine. All bearing
clearances are perfect, there is plenty of clearance in the sump for the oil
pickup, no marks on the sump, and the crankshaft was crack tested.
Everything seems OK.
> We do not want to remove the heads if we don't have to, and besides, the
stethoscope clearly showed that the noise was coming from down low.
> The company that rebuilt my engine is a well equipped shop with a good
reputation. They are scratching their heads big time!
> The real strange thing, and maybe the biggest clue, is that this noise
comes along only after about 30 seconds running from cold.
> Thanks in advance for any clues.
> Glenn Barratt,
> 57 Fury,
> Auckland, New Zealand.
>
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