It may also just be your particular 240 that does those things.

It should have no problem running flat out/top speed, especially with a rebuilt engine. I run my 617 flat out sometimes for a while and it enjoys it just fine. I am still waiting for the day I can get one. I want either a nice 240 manual...or a C220 auto or manual. While keeping my SD of course. I've put waaaaaaay too much $$$ into it to ever even consider selling it.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

yeah, on my 240d, we open her up on a flat stretch for a while. most of the time at 80-85. temperature never changes with speed, i don't think it should.

as you run faster the temp will come up a bit nearing the top speed. this is normal.

it will come up pulling hills too.

tom w

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I've driven my 240D on a couple of 1000+ mile trips, it seems happy up to about a steady 75 mph. Over about 75 it seems like it's straining a bit, probably OK for a short time but not for hours at a time.

75 mph with standard or auto, or does it really matter much?
Dave

__________________
Currently driving a very clean 1985 300SD from the West Coast.

Mine's an auto, a manual may give you a few more MPH at the same rpm. I would judge by the sound/feel of the engine. I just don't like to keep it at 100% for extended amounts of time.

I'd fix the oil pressure guage for sure., Its stuck/ non operative.

I checked the oil pressure gauge, it does go down when I turn off the car. But nothing else changes it from pegging at 3 when the car is on. So this is a good thing then right?

What does it read during the glow cycle? Does the guage go up as you crank the engine? When my GP fuse blew the oil guage started to climb during extanded cranking.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

When switched off the it should be at 0. When starting it should rise fairly quickly to 3 and stay there until it warms up when it should be below that at idle. It should not stay pegged at 3 all the time. Slightly below 3 to around 2 should be about normal when at operating temperature and idling, especially after a long run. For instance if you come off a freeway and stop at a light. If it's still pegged at 3 then as I've suggested earlier see if your idle speed control knob is turned all the way anti-clockwise and try adjusting it clockwise to reduce the revs at idle. Also does it have the correct amount of oil in it or is it over filled? The higher the level on the oil pressure gauge the better certainly, but permanently pegged at 3 except when it's switched off with no lower pressure at idle just sounds excessive to me.

- Peter.

__________________
2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S