Mercedes-Benz: 87 300D Turbo -- Tach Malfunction?

Hello everyone,

Recently the tachometer on my 1987 300D Turbo (124 Chassis, 603 series
engine, 175k mi) has been showing a bit off in the high revvs range.
Previously my redline when floored in neutral (as per shop manual) was
5200rpm, normal, now it's showing 4800rpm. Engine sounds the same, but it
could be 400rpm lower and I don't notice.

Holding it in 2nd gear shows proper speed at maximum revs, but the tach
still shows 4600-4700rpm. 80mph shows about 3000rpm in 4th gear, which
seems normal.

The only changes recently have been fuel/oil filters (Wix brand from Napa
auto parts, not proper OE brand) and top off of fluids (oil, coolant).
Could the new fuel filter be the culprit, not allowing enough fuel into the
engine for max RPMs?

Any help appreciated,
Mike

Re: 87 300D Turbo -- Tach Malfunction?

Group: alt.auto.mercedes Date: Thu, Oct 23, 2003, 5:06am (EDT-3) From:
net.remove (Mike*"Rotor"*Nowak)
Will do. Do you know where the tach plug is located? I've heard bell
housing but that's it...
Could the inline filter be causing that much of a problem?
I'll advise when I look at the afforementioned... Thanks a bunch!
Mike
"IF YOU CAN'T SWIM DON'T JUMP IN" <net> wrote in
message newsublic.lawson.webtv.net...
check the clear filter but i would also clean off the contacts on the
tach plug.
also i would guess every thing is fine if the driveability is the same
as its been
case
240D 82
300SD 84
300SD 82
WAITING FOR MY SDL
the case, minus a few cans!
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
the filter would make it a bitch to start

the case, minus a few cans!