Need 1978 W116 Euro 280S Ignition Timing Info

Hi,

- The dwell angle for a tranistorized M110 engine with blue Bosch coil and two resistors should be 34°-40° (when checked with used points in idle; adjust to 34° once new breaker contacts have been installed).

- Ignition Timing:

- Adjust to 28° @ 4500rpm with the vacuum lines being disconnected (i.e. without vacuum correction) from the distributor.

- Check distributor's timing adjustment (with vacuum lines disconnected):
@ 1500rpm: 13...21°
@ 3000rpm: 27...31°
@ starter speed: 5° before TDC

- Check distributor's timing adjustment (with vacuum lines connected):
@ idle: TDC +/-4°

- Check vacuum correction (with vacuum lines connected of course)
@ idle: 4...6° in direction late
@ 4500rpm: 8...12° in direction early (i.e. in sum 36...40° before TDC)

Regards,

Gerd

PS: In case you've got access to the Flipbooks section, you may find the data (in German) here https://vdhflipbooks.de/books/…lenbuch-PKW-1980/#264-265 .

Hi Taha,

Regarding data concerning any kind of engine/gearbox/chassis/... adjustments & checks the so-called "Tabellenbuch" ("Technical Data" Book) would be fine, too - there's no need for the full workshop manual.

Unfortunately the "Tabellenbuch 1980" (providing data for the W116 series, too) isn't offered any longer by Mercedes-Benz (https://www.mercedes-benz-clas…atur/tabellenbuecher/?p=2).
Nonetheless the VdH still seems to be offering this one to its members (https://www.mercedes-benz-clas…atur/tabellenbuecher/?p=2).

But in case you just need to look up some data every now and then and don't need to have the printed book at hand in your workshop, it might be as good to check the Flipbook version....
Just apply for access as described here ZUGANG ZU DEN FLIPBOOKS BEANTRAGEN LEICHT GEMACHT (in German...).
Getting Flipbook access should even be feasible without having a VdH membership.

Btw: The schematics aren't part of the "Tabellenbuch".

All I know, there are

- dedicated workshop manuals dealing with troubleshooting the W116 electrical system (having a late M110, you should check the appropriate manual; the early W116 schematics - even the carburetor ones - aren't fully identical to the late ones as far as I know!?),

- schematics for the W116.

I guess you should be able to find the schematics required in the Flipbooks section, too.
(https://mercedesclubs.de/suchf…ase=all&limit=20&start=40, https://mercedesclubs.de/suchf…searchphrase=all&limit=20)

Regards,

Gerd

Quote from Gerd.Batke

- The dwell angle for a tranistorized M110 engine with blue Bosch coil and two resistors should be 34°-40° (when checked with used points in idle; adjust to 34° once new breaker contacts have been installed).

Hi Gerd,

is the dwell angle for transistorized (i guess still breaker triggered) different than plain old breakers ignition?

Thanks
Michael

Hi Michael,

Indeed.

The Databook 1973 e.g. recommends

- adjusting the dwell angle to 42° (39...42° when checking used contacts) for the standard, non-transistorized M110 ignition with breaker contacts,
while it should be

- adjusted to 34° (34...40° when checking used contacts) with the transistorized ignition system.

I guess a smaller dwell angle with the transistorized solution can do the job, as the primary / the charging current for the coil can be higher with the transistor switching it - as a result the energy required for generating the spark can be "pumped" into the coil in a shorter period of time.

Regards,

Gerd

...es gibt beim 280 S mit Transistorzündung keinen Unterbrecher mehr, ergo ist der Schließwinkel auch nicht einstellbar !!

...there are no points on the 280 S with transistor ignition, so the dwell angle is also not adjustable !!!

Quote from Gerd.Batke

the charging current for the coil can be higher with the transistor switching it

hm?
I thought something like that, but was trying to find out where the higher charging current should come from.
So sorry for asking for more details. If I am capturing this thread too much - please let me know Taha.

In case of the M110 transitorized solution: Is the serial resistor removed from the coil or where does the higher charging current comes from?

Thank's
Michael

Ok - I see - I am contacting Gerd directly - my question makes no sense in this thread context here.
Thanks and sorry

Hi Christian,

are there no breaker contacts on all 280S W116? - Or just on the late ones having the 0237302004 distributor Taha mentioned?

Checking the Databook 1973, it seems there's been a different distributor (0 231 309 001) on the early 280S / 110.922 engines - with breaker points?

Regards,

Gerd

...280 S W 116 up to 1978 has a standard coil ignition !