hello everyone i have a 1987 300d

i started a thread over on superturbodiesel.com about my stuff but there aren't that many people over there.


but here's a video of what my cars doing. any help is greatly appreciated.

i think the kick down stitch I sent working, and i think the injectors may need to be rebuilt.

the cars got almost 300k i have already changed the oil, bypasses over boost solenoid.




and here's a video of its idle.





thanks everyone!!

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Welcome to the forum!!!

I have a '87 300D myself. Now, I don't know much about the transmission issue other than to recommend changing fluid & filter. You may have a problem with the kickdown switch, but others more knowledgable than me can chime in.

In the first video, I noticed something familiar - bearing roaring noise. I had the same situation with mine, which ended up being the two rear wheel bearings. They are pricey at about $75 each & 3 hours mechanic's time to install. It's possible the noise is tire noise, but I doubt it. Have the car checked for wheel bearing wear, front & back, at your favorite indie's.

As far as the idle goes, it sounds OK to me. Mine was noisy, lots of injector clicking noise until I fed it some biodiesel. That cleaned them up somewhat. You might want to do a diesel purge (search forum for that) to see if it clears things up some. Keep in mind that these engines have hydralic lifters, so there is not valve adjustment.

Looks like your speedo is off, too. Might want to confirm by using a GPS. Mine is 5 mph slow, which got me several tickets before I had it checked.

With 300K on the car, you will certainly have some deferred maintenance to contend with, but you have an excellent car. It is the "rocket ship" of MB diesels. I love mine & would be hard pressed to get rid of it for something other than another one.

So just take your time, do a forum search on the items you question & ask questions here on this forum. There is more knowledge here than anywhere on the 'net.

Again, welcome!!

__________________
1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed

I see great RPM swing in lowest gear, maybe the shift points are off? (Adjust bowden cable length between the "throttle" control and tranny). What if you move the gear lever through the motions on your next run, does that help?

In the lowest gear, do you get matching thrust in your backside off the line from dead stop (indicates good ALDA) and renewed life again at 2500+ RPM (when turbo boost comes on)? Do you blow black smoke out the back at any time during the run?

Check the air filter and I'm wondering if you have a constricted cat in the exhaust. Remove the bolt you see or EGR tube from the exhaust manifold and do a re-run. Will be loud don't let that fool ya into thinking you're going faster.

Lift each wheel, in neutral, and spin it to see if you're dragging a brake.

Looks like you're leaking pressure in the turbo cross-over tube to manifold, new gasket.

Oh ya, green coolant is bad for this engine. Zerex G5 or Benz coolant only.

__________________
Cheers!
Scott McPhee

1987 300D

thanks for the welcome man. yea i know my wheel bearings are going bad. they sound awfull. even worse at higher speeds. but i will deff check the speedo i hadent even though about it being off.


when i shifted manually with the shifter there was really no difference.

off the line it feels pretty dead. then once the turbo spools its decent.

i have the manifold connected directly to the alda so its getting boost i suppose the next step it removing it and seeing whats up.

the only time i have ever seen black smoke is revving at idle and its only very limited.

the air filter dident seem to bad when i took out the intake track to look at the turbo shaft play. if its the cat i would be pretty annoyed. i dont feel like welding a pipe in its place.

ill go check the wheels and drain the green coolant and put different stuff in. i figured green was better than none. lol when i drove it home it barely had any in it.

ill also check to see if that cross over is leaking. even if it is that shouldent create a huge difference in power.

Dead off the line, low RPM gutlessness, never black smoke, are typical of bad ALDA. Pop it off. Re-test.

many posts on here how-to do it, basically the fat nut you see holding ALDA on gets spun clockwise as you hold ALDA in static position, which may seem counter-intuitive.

__________________
Cheers!
Scott McPhee

1987 300D

Ya ive done plenty of research on removing it seems decently easy. Ill probably try to pull it tommorow.

Your glow plug light is not working.... Dieselgiant.com has a good DIY on that.

Have you cleaned your ALDA? Adjusted your linkages? Idle just sounds like you need injectors cleaned/poptested rebuilt.

As far as the ALDA dont go about removing it yet. Feed it some pressure and see if it holds. Either way its not the problem here. I am betting linkage is not hitting max stop.

STD is more for perfomance and less for maintenance.

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

hi! lol.

how is my glow plug light not working? it lights up when i first turn the ignition and then turns off after a few seconds.

i havent cleaned it so ill do that and re attach it. but its getting pressure. its hooked right to the intake manifold.

ill see what i can do about the linkage.

and i know that its for performance thats why i joined i have big plans for this car in the future. i just need to get it right before i go getting a bigger turbo and what not.

In the first video it does not come on. Just put the hose going to alda in mouth or on mighty vac and give it some pressure. It should hold. Also the nipple bolt on manifold and alda can get clogged. Either way with plugged ALDA you should be able to get it to 80. which is why I am voting linkage. Get a helper (I used 35lb dumbbell) to push the pedal all the way down. You will see a little trigger/hammer on the engine side of the IP come up. If not hitting the protrusion on the IP then your not getting full fuel. Adjusting those 2 bolts on the linkage under the intake manifold is a PITA but will make a world of difference.

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

FWIW, I removed my ALDA after finding it wasn't working properly. If you do remove it, it will seem like a different car...

__________________
1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed

A smokey one at that!

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

a pipe cleaner will fit into the hose barb on the intake manifold and should come out clean, if it comes out coated with goopy black muck then the manifold is plugged up, often from years of running with the EGR working. You can blow air pressure into the hose barb but never blow from an air gun into the ALDA or its toast. A mityvac is OK and will show if its leaking down.

Its such a PITA to remove the ALDA on this engine that all the above should be checked first because they are easy things to perform.

You say the manifold feeds right to the ALDA, bypassing the overboost switchover valve? That's good because those valves tend to get plugged and the result is a very sluggish car just as you described.
Since that valve has been bypassed then if the manifold is not plugged I would put my bets on the CAT being plugged or maybe the timing is off.
DDH

__________________
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!

yea i checked to see if any of the lines to the alda were blocked. i took the barb off on the manifold. stuck a tiny allen wrench in. it was covered in gross black goop.
then i did a test with the barb off and it definitely got a boost reading. i changed both of my fuel filters today. not much different.

So i do think ill have to clean that out but thats a whole other problem, previous owner dident use correct size allen wrenches and stripped the cross over tube and few of the intake manifold bolts. ugh :/


i dont think the timings off because it runs pretty much perfect otherwise.
its just not quite there yet.


Winmutt. i tried to find this trigger/hammer you spoke of and i had no luck finding it. could you be a little more detailed on where it is?

if you are referring to the manual stop lever. it almost never goes more than 35* above level.

Another talking point courtesy of gsxr -



The throttle linkage from the cruise actuator pushes the top of the throttle arm forward. Throttle arm travel is limited by the stop just below the brass bracket on the far left. I believe winmutt wants you to floor the pedal (engine off!) and ensure that the throttle arm rests on the stop. If it doesn't, figure out why.

Sixto
87 300D

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Ahhhh. Ok ill take a look at it.