Timing is ever-so important to a diesel engine. As the engine ages, the
timing tends to retard, usually caused by the stretching of the timing
chain. If the timing is only 4-6 degrees retarded, just set it. If it
is retarded further, you need to check the condition of timing
chain/gears. Chances are, they will need replacing. Be sure all glow
plugs are operating, and be aware that any older diesel will tend to run
rough, and smoke, when started cold. This will be worse as the weather
gets colder. Once the engine is at operating temp, there should be very
little smoke, mostly black, seen on acceleration. If there is blue
smoke, along with a rough running engine at idle, chances are that the
pump timing is retarded. 4 degrees retarded is enough to cause
smoking/rough running at operating temp.
E.J.
On Sun, 1 Jul 2001 13:04:18 -0700 "chance wolf" <timberwolf@wheeldog.net>
writes:
>
> ----- Original Message -----
> From: <mblair1@home.net>
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Sent: Saturday, June 30, 2001 8:21 PM
> Subject: [MV] GM 6.2 liter diesel question
>
>
> > it warms up, and also runs a bit rough at idle until it warms up.
> I'm
> > trying to figure out what might be causing that... glow plug
> problems,
> > a leaky cylinder or two until the engine warms up, oil or fuel
> > dripping into one or more cylinders when the engine is off,
> injector
> > problems, etc. I'm checking the glow plugs first, because that's
> > easier than pulling out injectors to test them, doing a
> compression
> > check, etc. :-)
>
> We've been cycling a few of our HMMWV's through a local diesel
> specialty
> shop to have the injector pump timing checked. Every one so far has
> been
> out of whack, and one of 'em was so far out that it couldn't even be
> timed
> because some mil-mechanic or contractor put the pump in a tooth or
> two out.
> One of the humvees which used to have a horrible habit of belching
> smoke
> (which I thought was overfueling) cleared up considerably after the
> pump was
> timed properly, so it could very well be yours should be checked as
> well.
>
> I'm tempted to recommend the company spend a few bucks on one of the
> dynamic
> timing rigs the diesel shop uses (it's CAN65.00 just to have them
> hook the
> thing up for diagnosis!), but I understand they're a rather pricey
> addition
> to have hanging around on the wall until needed.
>
> Andy Hill
> MVPA 9211
> Vancouver, B.C.
>
>
>
> ===Mil-Veh is a member-supported mailing list===
> To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
> To switch to the DIGEST mode, send e-mail to
> <mil-veh-digest@mil-veh.org>
> To reach a human, contact <ack@mil-veh.org>
>
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
This archive was generated by hypermail 2b29 : Tue Aug 07 2001 - 09:34:10 PDT