Got an 1982 Merc 300D. Starting from a dead stop is slow - painfully
slow. I think it could be a safety hazard in city traffic not being able
to get out of the way.
When I take it on the road - it eats mile after mile without a hickup.
High speed passing is excellent for an old diesel. It's a case of Jeckyl
What can I do, adjust or replace to get it off the line with reasonable
One other thing - where is the water jacket drain plug on the crankcase??
On Sat, 26 Mar 2005 10:35:33 +0000,
had to open a new box of zerones to say:
Above all, putcherfootinit..! Your car is a turbo model and has more
than enough power to accelerate to and maintain city driving speeds,
but you have to pay attention... You have to drive a low hp diesel
about 100 yds ahead of where you actually are by observing the traffic
patterns and flow and reacting to them much earlier... I used a 67 hp
240D in Washington, DC as a daily driver and never had a problem
keeping up with traffic...
Block's coolant drain is on right side, near starter. A herculean effort
may be needed to open its plug.
If this is a sudden condition I'd suspect the fuel is bad - may be
contaminated with gasoline.
Is the transmission shifting into 1st gear at a dead stop? You can shift
it into 1st at a dead stop (only) by shifting into L. The box not
shifting into 1st contributes to the dead acceleration problem.
I assume this is a turbodiesel, if not disregard this paragraph. At the
aft end of the intake manifold, near the firewall, is attached a small
plastic tube via a brass "banjo" fitting and hollow bolt. Oil, soot etc
collects in these and should be cleaned out with a small wire. Do that.
Then follow the plastic tube to an electric valve (switchover valve).
The valve is connected via a couple of short rubber hoses; be sure these
are well connected and not broken. As a test only, you can by-pass the
switchover valve - it too may need to be cleaned. Then follow the tube
to the injection pump's ALDA, again ensuring that it's well connected.
The purpose of this plastic tube is to "tell" the injection pump the
level of turbo boost so the IP can add fuel to the engine for better
acceleration. Blocking the passage with dirt or having the tube open or
broken will flatten the engine's acceleration.
Some will tell you to "adjust" the ALDA; don't - the engine was fine
before and "adjusting" it risks breaking its brass bellows (inside the IP).
Check the carpet under the accelerator pedal. Sometimes the mat gets
bunched up, or the rubber cover comes off the pedal and prevents it
from full travel to the button at the bottom. You won't notice this
at highway speeds.
On Sat, 26 Mar 2005 10:35:33 +0000, Ron Tellus wrote:
Painfully slow depends on what you're used to.
I think I could give a 3-cyl Geo Metro a run
for it's money from a stoplight in my '81,
but anything bigger is probably going to leave
me - for a minute. I saw one response suggesting
that the fact you have a turbo (? 1982 - really?
Damn, I missed it by one year) makes a difference
off the line - but that's exactly where a turbo
makes the LEAST difference. You'll notice
the turbo difference most on the old 300s when
up to speed. Sorry, that's just the way turbos work.
The faster they go, the faster they go.
A bit more info might help. Has this car always
been slow off the line, or did it used to melt
the tires? Was your last car that you're comparing
it to maybe a Cobra, Corvette, or 911?
Are there any other issues that might be relevant -
oil usage, fuel mileage?
The 300's weren't rockets - but they weren't total
slackers either, when you consider that you could
get around town fine in a 240. Try to beg, borrow,
test-drive any other 300 you can get your hands on.
This includes random encounters in shopping mall
parking lots - you'd be surprised how friendly a
lot of the old 300 owners are when approached reasonably.
That may give you a better performance reference for
yours (i.e. My buddies 300D can do 0-60 in 3.8 minutes,
and mine takes 7.2 minutes - what's wrong?)
On Wed, 30 Mar 2005 15:42:27 +0000, Frater Mus wrote:
ExWife has a 3-cyl metro, which I get to drive anytime it
sounds funny, I've had several small CC bikes ranging
from the Honda "step-through" 50 to Motebecane moped with
the cool variable v-belt "transmission". No beetles, but
I did have a 78 VW transporter with the "hot" 2-liter
injected engine. But the best point of reference is probably
driving another 300. They really don't seem to care if you
put your foot in the accelerator pedal - no matter how I
drive mine, I get about 27mpg. But the bottom line is this,
the 300s were basically German taxis, and should be able
to negotiate urban traffic with no trouble.
Still don't know if this is a recent problem, or the the
car's always done this. Have you replaced BOTH fuel
filters? And before we go too far, do try to drive another
300 - it may shed a lot of light on just how well yours
On Fri, 1 Apr 2005 16:45:22 +0100, "Dori A Schmetterling"
My late mother in law, god rest her soul, had a 240D that she special
ordered with a three or four speed manual on the floor (can't remember
which), no air conditioning, no radio, and no cigarette lighter. I
think it also had cloth seats, as she didn't like leather seats. Cost
$13,000 new, which was a lot of money for a car then (this was in the
early to mid 1970s, can't remember the exact year).
She drove it so rarely that the battery would regularly run down in
the garage and AAA would have to come jump it. I remember driving it
and having to shift so often that my leg was sore after only a short
while, especially in the somewhat hilly part of New Jersey where she
To say it was underpowered (and steaming hot inside in the New Jersey
summer) would be an understatement to the 10th power. But I noticed
that once up to speed on the highway, it was rock solid, about the
nicest car I'd ever driven.
Eventually she sold it, because she had rotator cuff damage in her
right shoulder and she could no longer shift the car. I think the 240D
had under 50k on it. She offered it to me and her daughter, my wife,
but without AC we just couldn't see it.
She then bought a fully equipped 1987 420SEL with 64,000 miles on it
from a friend of mine. It is still in perfect condition at 119,000
miles and we are driving it today.
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