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  #1  
Old 12-28-2009, 06:59 PM
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Join Date: Dec 2009
Location: circleville ohio
Posts: 350
bought my first MB diesel today, now its time to fix all its issues...

Ok bought my first mercedes diesel today, well traded for my vw diesel pickup... I know abosolutely nothing about mercedes. the car is a 1980 300sd turbo diesel. Has minimal rust but has many other problems that i need help with.
1. the speedometer works, but above 25mph it makes the loudest vibrating sqealing noise. So suggestions here.
2. the odometer hasnt worked for a while...
3. the tachometer doesnt work...
4. no fan at all on the heater, no matter what buttons i push...
Ok now what are somethings that i should know about that tend to go wrong, or that are good to upgrade. Also what can i do to get the best mpg possible...

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__________________________________________
1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold
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  #2  
Old 12-28-2009, 07:14 PM
Aquaticedge's Avatar
Bump on a log
 
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Location: See Biography
Posts: 3,148
if it's a loud unbearable Screeching noise, you'll need to oil/Grease your Speedometer cable.
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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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  #3  
Old 12-28-2009, 07:29 PM
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Location: circleville ohio
Posts: 350
yes it is a loud unbearable noise so i will oil it and see how that works. My biggest concern is what to check with the heater controls, because i really cant drive it this time of year without defrost...
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__________________________________________
1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold
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  #4  
Old 12-28-2009, 07:47 PM
layback40's Avatar
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Join Date: Nov 2009
Location: Victoria Australia - down under!!
Posts: 4,023
Check fuses, you may get lucky on fixing the heater fan. There are many posts on here about the fan.
x2 for lube speedo cable
there are posts on here about odometers not working .
There is a lot about tacho's on here, do a search.
Make sure you change the oil regularly & change the fuel filters.
The valve gaps need setting regularly
make sure you always allow it to glow before starting, especially in the cold.
If you plan on using WVO expect trouble. Many of the head ache's on here are related to that.
Read the owners manual.
Change the trans fluid if it hasnt been done lately.
Have fun with your Merc, they are great cars, & will run nearly for ever if you look after them.
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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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  #5  
Old 12-28-2009, 08:40 PM
toomany MBZ's Avatar
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Location: central Va
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The tach is probably the amp.
The heating issue could be a number of things, but that has the dreaded servo unit.
Good luck.
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84 CD
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  #6  
Old 12-28-2009, 08:45 PM
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Location: circleville ohio
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what is the "dreaded servo unit"
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__________________________________________
1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold
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  #7  
Old 12-28-2009, 09:22 PM
ImBroke's Avatar
Diesel way of Life
 
Join Date: Jun 2004
Location: Cleveland, NY
Posts: 2,215
Search evil servo, and you'll find plenty of reading. It's a Chrysler thing, and I have no idea why Mercedes would use such a device.
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05 Mustang GT Vert (3) 101k
12 TSX Wagon Tech (66k) (93k)
03 CL Type S manual (157k) 163k
06 Subaru Outback base (135k) 153k
95 Del Sol (93k) 290k
93 Stealth ES (167k) 169k
18 Silverado 2500 LTZ Midnight (212) 4700
90 350SDL 253k

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  #8  
Old 12-29-2009, 11:45 AM
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Join Date: Dec 2009
Location: circleville ohio
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few more questions...
Where can i find replacement gears for the odometer??
Also i havnt tried to start the car cold cold yet, but even if it is still warm it doesnt just fire right up, it cranks over 2 or 3 times before it starts, is this a vacum related issue, or what should i look for???
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__________________________________________
1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold
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  #9  
Old 12-29-2009, 12:12 PM
daw_two's Avatar
diesel enthusiast
 
Join Date: Jan 2007
Location: Germantown, TN
Posts: 5,438
you should post your location. You might get lucky. A "bored" forum member who wants to pass along his\her knowledge to you might live within 5 miles.

I've got several parts cars.....
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daw_two
Germantown, TN

Links:
Current Car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more
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  #10  
Old 12-29-2009, 12:51 PM
okyoureabeast's Avatar
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Join Date: Jul 2009
Location: North America
Posts: 1,652
I'm not too familar with the SD's but I know in my 85 there's an over volt protection fuse that runs the tach. If the SD's have it might as well take a look.

The servo I believe is made of plastic and lives inside the engine bay. From my searching it appears that the constant heat and freezing causes the unit to crack.

I'm guessing the solution is to replace it or find a manual climate control system. Either way it's a pain in the butt
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  #11  
Old 12-29-2009, 02:40 PM
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Join Date: Dec 2009
Location: circleville ohio
Posts: 350
I live in circleville ohio, which is just south of columbus... I will work on putting this in my signature.
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__________________________________________
1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold
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  #12  
Old 12-29-2009, 02:57 PM
toomany MBZ's Avatar
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Join Date: Nov 2006
Location: central Va
Posts: 7,820
Quote:
Originally Posted by okyoureabeast View Post
I'm not too familar with the SD's but I know in my 85 there's an over volt protection fuse that runs the tach. If the SD's have it might as well take a look.

The servo I believe is made of plastic and lives inside the engine bay. From my searching it appears that the constant heat and freezing causes the unit to crack.

I'm guessing the solution is to replace it or find a manual climate control system. Either way it's a pain in the butt
The 84 and 85's used a different tach set up.
A friend has the dreaded servo unit, new METAL servo and "new" amp, still doesn't work, so I'm suspecting the "new" amp isn't.
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84 CD
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  #13  
Old 12-29-2009, 03:21 PM
okyoureabeast's Avatar
Rogue T Tolerant
 
Join Date: Jul 2009
Location: North America
Posts: 1,652
Quote:
Originally Posted by toomany MBZ View Post
The 84 and 85's used a different tach set up.
A friend has the dreaded servo unit, new METAL servo and "new" amp, still doesn't work, so I'm suspecting the "new" amp isn't.
Yeah I thought so Worth a comment though.

They make evil metal servos? Are they still evil if they don't crack
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  #14  
Old 12-31-2009, 06:45 PM
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Join Date: Dec 2009
Location: circleville ohio
Posts: 350
update...

Well i opened the fuse panel and all of the fusses were corroded, and several were actually burnt in half... So after replaceing them all, i now have a blower fan, windshield wipers and spray, intrument cluster lights and operation, and best of all...glowplugs... Now the only thing left is too fix the noise in the spedometer and odometer. And the motor mount... the motor mount came in today, and i got the engine lifted off it, but the mount split in half and im having trouble getting the alenheads off... other than that she runs and drives great
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__________________________________________
1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold
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  #15  
Old 12-31-2009, 07:33 PM
toomany MBZ's Avatar
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Join Date: Nov 2006
Location: central Va
Posts: 7,820
^ Sounds good.

ok... I didn't know they made 'em myself, a friend mentioned that.

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84 CD
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