Broken valves and broken dreams

[putneyflash]

For whats it's worth, i took this out of a cat publication dated
01/07/1990 and updated 11/10/2001

Turbocharged engines may be operated at full load, at any rpm
between rated engine speed and 1400 rpm

NA engines rated at or above 175 hpcan be operated at at full load
down to 1900 rpm and may be operated at short periods at full load
down to 1400 rpm. operation at full load below 1400 rpm is not
recommened.

NA engine below 175 hp can be operated at at full load down to 1400
rpm and may be operated for short periods at full load down to 1000
rpm. operation at full load below 1000 rpm is nor recommended.

on upgrades begin downshfting when the engine rpm starts to approach
full torque (1400 rpm) fuel economy will be best if you let the
engine lug back to around the this speed before you down shift.
down shift until a gear is reaced that will pull the load.

extended operation in a lug conditionwill raise exhaust temperature
and cylinder pressure. this can reduce engine life.

re



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In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
<MHOHNSTEIN@...> wrote:
>
> Hmm, 2200 is 55 in your "vehicle", sounds like "around" 2 grand to
me. Mebbe you need a hobby?
> MH
> ----- Original Message -----
> From: Jon
> To: WanderlodgeForum@yahoogroups.com
> Sent: Thursday, March 16, 2006 6:32 PM
> Subject: [WanderlodgeForum] Re: Broken valves and broken dreams
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
> <MHOHNSTEIN@> wrote:
> >
> > It should be noted that BlueBird recommended and I quote; Keep
it
> around 2000 rpm. The recommendation is for the 3208. Cat calls
2400
> rpm in marine applications, "continuous cruise speed".
> > Some people think it's wise to check valve adjustment every
50k
> miles, some think that's too much. I check it more often as I
fear
> broken parts and I DO NOT EVER take short cuts with my vehicles
of
> any kind.
> > However, ignorance is bliss for most folks and occasionally
the
> bite in the butt from reality hurts.
> > Weak valve springs is the most common cause of valve failure,
> springs can lose tension in storage. At rest, some valves are
open at
> max lift and some are closed. Those that are open can take a
set and
> lose closing strength, this allows the valve to bounce in
operation,
> compound the problem by running 2700/2800 rpm and some times
stuff
> breaks.
> > Watch that valve lash and check the valve spring tension
regularly,
> other wise, keep your fingers crossed. Ain't diesels fun?
> > Mike Hohnstein
> > Germantown, WI
> > 83FC35
> >
> > [Non-text portions of this message have been removed]
>
>
> Just one nagging question and that concerns the chart on the
Vintage
> Bird site! it states that at 2000 RPM' at 3208 n/a engine in a
F/C
> unit speed will be 48 MPH. Now lets get real about keeping it at
2000
> RPM's and going down a freeway. Do you think when these coaches
came
> out that the Bluebird Corporation stated in there factory
manuals
> that there motor coaches would last allot longer if they were
only
> driven under 50 MPH? I might be different than most drivers but
I try
> to keep my speed at 55 but not 48 mph on the freeway. Does
anyone
> have a drivers manual for one of these old units? it would be
> interesting to check it out and see what corp. said in those
days.
>
>
> Jon
> 1978 Wanderlodge
> Bremerton Washington
> >
>
>
>
>
>
>
>
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