Chime in -Which Diesel? 78 300CD or 91 300D 2.5 turbo? - Page 3 - PeachParts Mercedes-Benz Forum

Austin85 · #31 08-13-2013, 11:16 AM

Quote:

Originally Posted by JamesDean

I vote for the 300D.

...My only other significant problem with the failure of the plastic drive gear on the governor and output shaft in the transmission. $40 in parts to fix.

My car too has 134A and as long as its 85F or below it works pretty well. At least with its current charge and etc etc. I mean doing AC work is not horrible. I just bought a Robinaire vacuum pump for $100, new.

.... I can post up my maintenance history log if you want to see. There are some prices of stuff done in there... etc.

I think the 300CD would be cool but a large amount of work over the 300D. plus....300D (iirc) is 120 HP?

Saw your sig mentions cruise control & he believes this cc is in/op due to linkage not being hooked back up after the new transmission was put in about 2 years ago. ( $2,500. job ) Any input on how to hook that back up ? Where to start ? is it a DIY job ?

On the Air being 134A and this is S. Fl I am going to be looking for it blowing cold but also no vac leaks and coming out strong enough to cool the cabin quickly. I went to see a beautiful 92 300E gasser yesterday - 1 owner clean clean in & out but the AC was almost non existent like it was getting trapped in side the dash ....

Thanks,.

Austin

.....

ROLLGUY · #32 08-13-2013, 11:26 AM

Quote:

Originally Posted by Austin85

Saw your sig mentions cruise control & he believes this cc is in/op due to linkage not being hooked back up after the new transmission was put in about 2 years ago. ( $2,500. job ) Any input on how to hook that back up ? Where to start ? is it a DIY job ?
.....

The cruise control servo is mounted under the intake manifold, and has nothing to do with the trans. It is common for these units to fail. I had one fail on me while revving the engine in the driveway. It caused the engine to race, and not idle down. If I was driving the car at the time, it might have caused a crash. Chances are the linkage was removed to prevent a similar occurrence. It is easy to hook back up, but be cautious, it is not worth crashing the car to have cruise control!

Austin85 · #33 08-13-2013, 11:32 AM

Quote:

Originally Posted by ROLLGUY

The cruise control servo is mounted under the intake manifold, and has nothing to do with the trans. It is common for these units to fail. I had one fail on me while revving the engine in the driveway. It caused the engine to race, and not idle down. If I was driving the car at the time, it might have caused a crash. Chances are the linkage was removed to prevent a similar occurrence. It is easy to hook back up, but be cautious, it is not worth crashing the car to have cruise control!

Bummer. I like cruise control alot. ..* Not to sounds blasphemous here , but I have never owned a bimmer & there is also a very nice 96 318i - 5 speed convertible black / black that is on the way back home - description :
- AC
- Radio / CD
- new brakes (7000 miles)
- black leather seats
- car about 239000 miles
- engine got replaced and got about 139000 miles
- runs perfect, never got problems
- 5-speed manual transaction
- printed document which says no accident

....

JamesDean · #34 08-13-2013, 11:32 AM

Quote:

Originally Posted by Austin85

Saw your sig mentions cruise control & he believes this cc is in/op due to linkage not being hooked back up after the new transmission was put in about 2 years ago. ( $2,500. job ) Any input on how to hook that back up ? Where to start ? is it a DIY job ?

On the Air being 134A and this is S. Fl I am going to be looking for it blowing cold but also no vac leaks and coming out strong enough to cool the cabin quickly. I went to see a beautiful 92 300E gasser yesterday - 1 owner clean clean in & out but the AC was almost non existent like it was getting trapped in side the dash ....

Thanks,.

Austin

.....

On the OM602, the actuator is mounted TO the intake. The 603 is mounted under. There is one piece of linkages that connects the acutator to the remainder of the throttle linkage. Mine broke (its plastic) once and I had to replace it $18.

Last entry on the page.

As far as failures go, 90%+ of the time the failure is in the amplifier. I've seen a few actuators fail but a very small percentage compared to amplifier failure. The 91 300D uses an 005 545 05 32 part number amplifier. I have put nearly 30,000 miles on one of my rebuilt amplifiers in my own 300D.

https://sites.google.com/site/mbcruisecontrolrepair/home/component-locations/actuator-locations

JamesDean · #35 08-13-2013, 11:37 AM

Quote:

Originally Posted by ROLLGUY

The cruise control servo is mounted under the intake manifold, and has nothing to do with the trans. It is common for these units to fail. I had one fail on me while revving the engine in the driveway. It caused the engine to race, and not idle down. If I was driving the car at the time, it might have caused a crash. Chances are the linkage was removed to prevent a similar occurrence. It is easy to hook back up, but be cautious, it is not worth crashing the car to have cruise control!

Not that common for the actuators to fail. It can happen certainly, but in my experience, the failure is mostly in the amplifier. I think out of 250+ repairs less than 10 clients have reported actuator problems.

Was this failure during revving on a Mercedes?

Austin85 · #36 08-13-2013, 11:56 AM

Thanks, Heading down to Miami soon. Should be there by 2 pm est.

....hoping for a nice D.

...

huntercody · #37 08-13-2013, 04:38 PM

Quote:

Originally Posted by JamesDean

On the OM602, the actuator is mounted TO the intake. The 603 is mounted under. There is one piece of linkages that connects the acutator to the remainder of the throttle linkage. Mine broke (its plastic) once and I had to replace it $18.

Last entry on the page.

As far as failures go, 90%+ of the time the failure is in the amplifier. I've seen a few actuators fail but a very small percentage compared to amplifier failure. The 91 300D uses an 005 545 05 32 part number amplifier. I have put nearly 30,000 miles on one of my rebuilt amplifiers in my own 300D.

https://sites.google.com/site/mbcruisecontrolrepair/home/component-locations/actuator-locations

Not to Jump the thread, but since he is buying today...I have otherwise stepped the motor down from electrical to mechanical so far.. If I am not using the cruise control, I can remove the entire assembly in the top red high-lighted square. I do not need the single linkage heading back for manual throttle, correct? Throttle close tension is from the aft arm?

ROLLGUY · #38 08-13-2013, 04:58 PM

Quote:

Originally Posted by JamesDean

Was this failure during revving on a Mercedes?

Yes it was on my bro's '91 300D 2.5. I started it up to back it out of the driveway and revved it up a little, but I just pushed a little on the accelerator and it stuck. On a gas car, the tendency is to push all the way down and then let off, and that is what I did. It just revved up all the way and I shut it down as quick as I could. I opened the hood and saw the servo arm holding all the way at WOT. I disconnected the arm, and it has been fine ever since (without working CC of course).

JamesDean, you are correct. I thought the servo was under the manifold (had the vision of a 603 in my head), but it is in fact on the side. I stand corrected...Rich

winmutt · #39 08-13-2013, 05:10 PM

Don't forget the the vac pump! 91 2.5 is by far the better of those cars. Mine has the hifi audio and sounds amazing (rainbow replacements at some point).

vstech · #40 08-13-2013, 05:16 PM

yeah, the VP, the belt tensioner, the various front end parts, the rear sway from worn rubber... etc etc etc...
however, I'd STILL prefer the 124 over the 123...

then again, I'm working on my 240D 5 speed... how crazy is that?

JamesDean · #41 08-13-2013, 06:12 PM

Quote:

Originally Posted by ROLLGUY

Yes it was on my bro's '91 300D 2.5. I started it up to back it out of the driveway and revved it up a little, but I just pushed a little on the accelerator and it stuck. On a gas car, the tendency is to push all the way down and then let off, and that is what I did. It just revved up all the way and I shut it down as quick as I could. I opened the hood and saw the servo arm holding all the way at WOT. I disconnected the arm, and it has been fine ever since (without working CC of course).

JamesDean, you are correct. I thought the servo was under the manifold (had the vision of a 603 in my head), but it is in fact on the side. I stand corrected...Rich

Certainly a scary incident and an abnormal failure mode. I have heard of cases where when engaged (via the stick) the cruise will go full throttle but never a case where it came on with the vehicle at a stand still. I wonder if the amplifier failed or if it actually was the actuator. Certainly interesting. Glad to hear no one was hurt!

By far the M102/M103 are the most pain in the butt ones to access. They are fully under the intake. I think the 603 is still somewhat accessible for removal or maybe it cant be hmm.

Quote:

Originally Posted by winmutt

Don't forget the the vac pump! 91 2.5 is by far the better of those cars. Mine has the hifi audio and sounds amazing (rainbow replacements at some point).

I've got the stock stuff as well. I had to add door speakers (some cheap 6.5's) and a pair of subs.. but the stock/regular speakers sound good. The funky tuner/active bass system on mine as shot thought..

Quote:

Originally Posted by vstech

yeah, the VP, the belt tensioner, the various front end parts, the rear sway from worn rubber... etc etc etc...
however, I'd STILL prefer the 124 over the 123...

then again, I'm working on my 240D 5 speed... how crazy is that?

Says the guy with a billion cars in his lot? LOL

JamesDean · #42 08-13-2013, 06:13 PM

Quote:

Originally Posted by huntercody

Not to Jump the thread, but since he is buying today...I have otherwise stepped the motor down from electrical to mechanical so far.. If I am not using the cruise control, I can remove the entire assembly in the top red high-lighted square. I do not need the single linkage heading back for manual throttle, correct? Throttle close tension is from the aft arm?

I believe so yes. You can remove the actuator and the arm that it attaches to as the that's all it serves.

Mark DiSilvestro · #43 08-13-2013, 06:44 PM

Quote:

Originally Posted by JB3

whats the price on the 240?

Were it me, id buy the 300CD, buy the local 240 4-speed, make the 300CD a 4-speed manual, swap over the 240 simple climate control, put the 300CD automatic in the 240, sell the 4 door for parts or repair, keep my 4-speed simple coupe with simple climate control.

Swapping over the tranny and climate-control is WAY more work than most people, including me, want to deal with. It's why I waited for a slghtly-flawed, 5-speed Euro TD to come up locally for a near reasonable price. Manual heat/AC, manual windows, and a German factory trailer-hitch already installed.
Maybe it's not quite so stylish as the coupe, but it's been far more usefull. And with the 5-speed, I don't miss the turbo.

Happy Motoring, Mark

Austin85 · #44 08-13-2013, 07:42 PM

Not a good day shopping wise. pics below . Started out from Boca - 1st stop was to see the 96 BMW stick convertible. Paint was too rough less clearcoat and scratched up front fenders .. AC I dont get it .. Like the 300E I saw yesterday, they blow cold, not cool but not as cold as they should.

Then down to South Miami - traffic s****ed . If it wasn't for the possibility of getting a nicer 300D for $2K I wold have been more picky with my time. Another lesson reminded today. see pics.

Austin85 · #45 08-13-2013, 10:29 PM

notes. The Wife Wants it gone ! He may junk it which is too bad bcs of the good of the car.....He asked me if I would take it for $800. If I need a driver I would have maybe...It is a PROJECT car but possibly worth that to a few DIYers...

The GOOD is 139,xxx original miles - 1 owner - Did start right up without any acceleration - has new $2,500 Transmission about 2 yrs ago. Seats are not clean but they are in fair to good condition. No rips but dirty. sunroof opens and closes - no leaks I could detect - dry trunk amazingly enough.

The BAD - the body is pretty nasty. front end smacked up needs new bumper at least.- hardly any clearcoat left on hood- roof and bottoms of side doors...
rear end really crushed in - trunk closes but is not sealed when closed bcs it is bent out of shape. interior - - headliner starting to sag over passenger front OSB. Left front & right rear windows are in-op. Amazing too is there is a leak out of one of the Diesel return hoses like a pin hole size but it squits out like a garden hose.. AC not sure about he says there is a slow leak requiring recharge 2-3 yrs time. Cruise linkage is missing ...Good tires at a glance.....

If anyone is interested in this 300D in South Miami, FL and I can help , let me know...

Austin