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These little diesel demons are certified Torque MONSTERS but they do suffer a certian degree of "Turbo Lag" . They are a bit sluggish from a dead stop but the turbo charger should "Catch Up" about 25 or 35 feet out then the tires should bark second gear rubber on the concrete !! and she should have no troubble climbing any hill !!
A typical problem is that it is hard for a first time Merc diesel driver to push the pedal on down and let that little 2800 CC. (169 Cubic inch) mill wind up and do its work to pull the 5000+ pound tank up a hill. But if this is not the case it sounds like a diesel tune up is in order.
a good tune up on the merc 300 sd or d with 190,000 miles would be to change the oil and filter, and both of the fuel filters, and the air filter, and adjust the valve lash, and last but not least adjust the slack in the throttle linkage. A procedure for doing all of the above can be found in a Chiltons manual, although for other mechanical issues, I have found a Chiltons manual can be inadequate. So be careful what u spend $$ on, u may want a merc service manual.
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