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  #1  
Old 09-29-2002, 09:14 AM
CadTech7
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'89 300e

A new owner (2nd) of a prestine 1989 300E from an very mature lady. 54,000 original documented miles. I have some questions and problems. Where exactly is the engine #? When replacing the front drive shaft rubber ring do I also need the mounting hardware? What do I have to do to unlock the radio, it has 4 dashes accross the display? ABS and SRS lights are on. (did not come on when I test drove (10 miles) before purchase. Does engine require filter with check valve? What kind of gas mileage?
What are procedures for switching A/C to R134a? What RPM should you see at 55mph? Can you reset engine timing for less than premium gas? I have a Service manual on CD coming from Mercedes.
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  #2  
Old 09-29-2002, 10:38 AM
1992300e
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300e

Hey, congratulations on the car. First, probably have had limited responses to your note because much of what you have asked can be found by doing searches on this site. Second, machine gun blast of questions would take hours to respond to.

Please see below for some quick responses:


A new owner (2nd) of a prestine 1989 300E from an very mature lady. 54,000 original documented miles. I have some questions and problems. Where exactly is the engine #? Cd manual will provide you with that, also, believe it's stamped on motor down low on passenger's side above oil pan. When replacing the front drive shaft rubber ring do I also need the mounting hardware? What do I have to do to unlock the radio, it has 4 dashes accross the display? call dealership with vin and they will provide you with the code, also if you got the manual and owner's documents it should be in there ABS and SRS lights are on. sounds like based on the fact that you need to reset radio somone may have jumped the car and crossed the cables blew out OVP fuse, it's located behind the battery under a thin black plastic shield, two 10amp fuzes on top may have blown (did not come on when I test drove (10 miles) before purchase. Does engine require filter with check valve? What kind of gas mileage? [I] about 27 mpg highway [I/]
What are procedures for switching A/C to R134a? What RPM should you see at 55mph? Can you reset engine timing for less than premium gas? I have a Service manual on CD coming from Mercedes.

Joel
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  #3  
Old 09-29-2002, 03:03 PM
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Join Date: Dec 2001
Posts: 571
I'll answer what I feel comfortable with, but as the previous poster said, all of this has been covered and can be dug out using the SEARCH facility here.

ABS/SRS light on - very likely the bruses in your voltage regulator are worn. Replacing these is VERY easy. Put front of car on ramps. Pull large plastic shroud underneath engine. On passenger side below you'll see the alternator. 2 phillips head screws on bottom of alt. hold in volt. reg. New brushes are about 1/2" long. Yours are likely going to be much shorter. You remove the 2 screws, pull out the unit, stick in the new one and reinstall the 2 screws. It's that easy.

Timing - Your car has a knock sensor that will automatically adjust timing. Many people here and on other MB boards have reported using mid-grade gas. Several pro mechanics have said that the 103 motor actually runs better on mid-grade vs. premium. I use premium in my 103.

RPM - Don't know about 55mph, but at 70, I see about 3400rpm. You may be wondering why your car only shifts twice before reaching top gear. They start out in 2nd by default. If you want to start out from a stand still in 1st gear, either stomp the accelerator pedal(this will kick it down), or while stopped, drop the gear selector down into the lowest gear; then back to D.

Forget R134A - stick with R-12 - just my opinion.

Last edited by Mike Richards; 09-30-2002 at 12:36 AM.
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  #4  
Old 09-29-2002, 03:28 PM
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Your car will never cool as well with R134a.

Besides, refrigerant is the cheapest part of your cooling system anyway.

Stevebfl has posted a lot about a/c issues, and here is a good post he wrote replying to guy who is considering converting to R134a:

"As I have pointed out many times the R12 in your A/C is still the cheapest part of it. To settle for crummy A/C to save money on the cheapest part there is poor economics.

I'm sorry but I would have to say that someone who has settled for no A/C for four years is a poor judge of whether it works as well. I have done over a thousand retrofits and still do a number every week. I give a customer what they ask for. Some I spend the time telling them the way it is. Some think this means I'm selling something. They get what they ask for.

The hardest part of being a competent tech is getting people to listen to you.

I'd love to see this car in a year or two. How in H*** can a tech tell that a system is good if it doesn't work. Or did you just turn it off for four years on bad advice. Unless there is no refrigerant in the system WHY would one change the refrigerant?? If there is no refrigerant whats going to keep that new stuff in. R134a leaks about 4 times as easy as R12. It will definitely find a way out of the compressor in a couple years unless it is new now."
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #5  
Old 09-29-2002, 07:30 PM
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Join Date: Feb 2002
Location: Phoenix, AZ
Posts: 39
89 300e

I purchased a 1989 260e in Aug 2001 with just 43,000 miles on it from the original owner. The 260e is essentially the 300e chassis with a 2.6 liter eng. Since buying the car I have replaced the following: center and rear mufflers ( they were rotted out due to the fact the car was never driven far enough to reach operating temp), plastic thermostat housing (the neck broke off while driving), radiator (neck broke off while driving), right and left tie-rod assy's, and the tires. The tires had plenty of tread left but the sidewalls were cracking because it sat so much. I love the car and plan to keep it but have found that time is an enemy as well as milage. I've put $3000.00 into the car in the 14 mos. that I've had it and finally have it to where I feel I know the car and it is dependable. I've done all the work myself except for a front end alignment . Fastlane has quality parts at great prices and the posts help the do-it-yourselfer do much of the maint. Enjoy the car and happy motoring.
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