Topic: Another 6.9 that wont raise (diagnostic tips)

[secondslc]

I need to get a bulb in that spot as its burnt out, but I should probably let the light tell me if im reaching pressure...

[secondslc]

Put a used pump in. The old one was wet on the back... assuming it was leaking into the block ugh.

-Primed it as per suggestions in the forum
-Hooked it all up
-Started it
-The pressure selector finally started clicking.
-The rear end lifted up as if magic
-The front end lifted up as if magic

After 20 years, it drove around the block on its own. 

Next up I get to tune the engine as it's low on power.
But first:
-Change the plugs
-Change the oil
-replace the hydraulic oil filter
-Oh, and celebrate :-D

[daantjie]

Nice work!

[rumb]

Good news.

Check your timing, that should help with power.

[daantjie]

Changing out transmission fluid and filter should be high on the list too.

[secondslc]

Timing... any leads to a procedure?

Trans was empty as the cooler lines were shot. Replaced all the lines and put new fluid in. It shifts ok but itll get flushed once its road legal

[raueda1]

Timing... any leads to a procedure?

Trans was empty as the cooler lines were shot. Replaced all the lines and put new fluid in. It shifts ok but itll get flushed once its road legal

MB manuals are on this site.  Here's the link:  https://img.w116.org/tech/Manual_100-985_Combustion_02_83.pdf
Drill down to the section on timing.  Specs are there.  Before doing so, however, make sure the elements of the distributor can move freely and aren't gummed up (quite likely if the car has been sitting for years).  And if so, you'll never get the timing right. Good luck!

[secondslc]

Thank you for this! I have a hard time finding the tech articles for the 6.9 specifically.

The distributor moves, it was loose when I got the car 

[raueda1]

Thank you for this! I have a hard time finding the tech articles for the 6.9 specifically.

The distributor moves, it was loose when I got the car 

My grandmotherly and forgetful neighbor repeatedly calls over to me as she trims her roses, "David, you're always working on that car!"  And my reply is always the same.  "Glenda, this isn't a car.  It's a hobby and way of life!"  A week later this will be repeated verbatim.

Anyway, the tech page https://www.w116.org/tech/.  The 100.985 manuals are the ones you want.  The quality is not great and photos are near useless, but they're there. A lifesaver.  Thanks to whoever put them up in the first place!

[revilla]

The distributor moves, it was loose when I got the car 

Hi secondslc.  I think Dave was referring to the guts (elements, weights, sliders, springs, etc) inside the bottom of the distributor housing.  If they are not clean free of grime they have difficulty responding to the centrifugal forces to advance the timing which will have an impact on power.

He documented the procedure in a post here with details and pictures, etc.  When I did mine following his guideline the improvement was quite noticeable!     

[secondslc]

ohhh, i am a little intimidated taking that apart, but I suppose it will make sense when i get into it. I’ll report back once I get going.