Or possibly the water pump shaft going back and forth. Check the thrust
washer and its adjustment on the front of the engine. If the shaft was foing
back and forth, it would advance-retard the timing.
Steve AKA Dr Deuce
----- Original Message -----
From: Douglas Greville <dgrev@ruralnet.net.au>
To: Military Vehicles Mailing List <mil-veh@mil-veh.org>
Sent: Saturday, March 03, 2001 5:01 AM
Subject: [MV] Engine problem - ideas?
> Everyone
>
> Am having continuing engine problems with the JXD Hercules in my
> M8 Greyhound. This problem is a known event amongst Greyound/M20
> owners and yet no-one seems to have a solution other than to bolt
> on an NOS Carby. I did find that the miss could be eliminated if
> the idle mixture screw was screwed down hard against its stop. So
> I have assumed carby problems as per the known tendancy, but am yet
> to be convinced this is so. After all the Zenith M29 Carby is about
> as basic as you can get!
>
> Here is what happened. We went on an outing and the vehicle was idling
> and behaving just fine. It sat for about 5 hours (not that I think the
> time factor has anything to do with it) and then we returned home. It
> was upon arriving home I noticed a distinct miss at idle which
> gradually becomes unnoticable the higher you lift the revs, but at
> least 1200rpm of more is needed before you can no longer hear the miss,
> which is probably due to too much fan noise more so than the miss going.
>
> So far, I have pulled the head off, checked the valves and pistons.
> Refitted the head after having it refaced, fitted a new head gasket
> using Hylomar (Rolls Royce super dooper head gasket cement). Pulled
> down and cleaned the carby (John Seidts is sending me Carby overhaul
> info). Replaced the spark plugs, run substitute spark plug and coil-
> to-distributor HT leads. Checked points.............All to no avail.
>
> If anything, the miss is now worse.
>
> So back to the carby. Having pulled down the carby, cleaned it, made
> new gaskets and put it back together; I now find that the setting of
> the idle mixture screw now will not eliminate the miss, so something
> has worsened - perhaps by coincidence, perhaps due to something I have
> fiddled with? I can only presume due to the need for the idle mixture
> screw shut off in the first place that the carby is letting through
> too much fuel - but how and why?
>
> The strange part about all this is that the engine still seems to be
> delivering full power and starts okay and in all other respects seems
> quite sound............ Weird.
>
> Pulling on the choke makes the eninge run rough and start to stall, when
> the choke is let go a puff of black smoke is emitted from the exhaust,
> which is what I would expect of any motor.
>
> Assuming:
>
> A) This is a carby problem, then just what the heck is it? There just
> isn't that many bits in a Zenith M29 that can go wrong, it isn't as if
> the main jet can wear out in 1 hours driving in one day or anything
> ridiculous like that?
>
> B)If it isn't the carby, then what is it?
>
> The only other thing I can think of is advance/retard weights in the
> distributor sticking?
>
> --
> Regards
> Doug
>
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Armoured Vehicles Collector
> _______
> _/_(_o_)_\_ ____
> _/|___|_|___|\_ /____\
> / [___] [___] \ Douglas Greville _/[o]___\_
> /\_ [o] [o] _/\ Broken Hill __/=_|____|_=\__
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> |w|\u u/|w| Australia |w| \ / |w|
> |w| \_________/ |w| |w|$ \______/ $|w|
> [w] [w] [w] [w]
> M8 Ferret
>
> dgrev@ruralnet.net.au
>
> Web Armour site at:
>
> http://www.users.zetnet.co.uk/lsm/dhmg/index.html (UK mirror site)
>
> and
>
> http://members.nbci.com/dgrev/index.html (US mirror site)
>
>
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This archive was generated by hypermail 2b29 : Wed Apr 04 2001 - 08:10:46 PDT