On my 81 300SD the first and second line are confusing.
The Rpm gauge goes in 500 Rpm intervals. Does this mean the first solid line is 500 or is it the second thin line right above it.

Right now my idle is set about mid way between the thin line and 1000 Rpm this I guessed was about 750 Rpm.

The thing that puzzled me was everything about these cars seems so exact and here was that second line out of place on the gauge. I was thinking maybe that was 750 and I was reading it as 500.

Can any one confirm this for me ??

Thanks.

__________________


Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

The first thin line means 500 RPM. Here's my cluster when I first bought the car ('83 300SD)

__________________
[/SIGPIC]~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"
[SIGPIC]




1983 Toyota Tercel (Tommy, The little Toyota that could)
1965 Ford F100 (Grandma Ford)
2005 Toyota Sienna (Elsa, Wife's ride)


Gone:
1988 Toyota Pickup
2004 Subaru Outback

1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT

yeah, it looks like the tach lines are thick 0 thin 500 thick 1000 thin 1500 etc...

One more question answered on my quest for the perfect idle.
The 500 just seemed a little odd spaced. So about mid way between 500 and 1000 should be my goal.

Thanks guys !!!

__________________


Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

I doubt that the factory uses the tachometer in the cluster to set the idle anyway. They probably have an external tach that's actually calibrated. Adjust the idle to where the engine is smooth and doesn't stall when you put it in gear.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970