I'm a neebie here & new to MB diesel (6 months). Coming from BMW e28 535i backround, I'm relearning how to drive PATIENTLY. I have an '81 240d, stick, manual everthing w/ 236k miles that has alot of the above symptoms. I've put approx 15k highway miles on her since purchase in 2/11. 214 miles a day on highway, I've lost 2 mpg, down from 28 to 26 hgwy avg, and it seems alot noisier (nailing?) I was not pleased w/ 28 mpg hgwy (no air & 70 mph cruise) now I'm down to 26.

Car was MB serviced until 2 yrs ago & I've got the records. Nothing shows injectors or timing chain replacement. I bought it w/ intention to convert to Veg oil, but have not.

Concerns:
1. Should I replace the injectors as a regular service item?
2. Replace or adjust timing chain?
3. Have injection timing checked/changed?

Items done:
1. 4 new CV joints in rear.
2. Redline gear oil in rear.
3. Redline MTL in gearbox
4. All new glows
5. Valve adjustment & cover gasket
6. New return lines from injectors

Any help will be appreciated, as I'll likely have to find/pay a mechanic here in FL to do the work. I Don't feel I have appropriate tools & diesel knowledge, though I'm pretty proficient with a wrench.

If you would like to have it serviced in Florida by true experts = http://continentalimports.com
Call and talk to Steve Brotherton first.
1219 S. Main St.
Gainesville, FL 32601 USA
(352) 377-6604
fax (352) 377-2218
http://continentalimports.com



Answer:
NO....... 1. Should I replace the injectors as a regular service item?
Replace it...... 2. Replace or adjust timing chain?
Doubtful, your MPG was OK..... 3. Have injection timing checked/changed?

Items done:
Did you use a reamer to clean the holes??? 4. All new glows
If the locking nuts are worn out/failed = they need to be replaced and adjusted again.... 5. Valve adjustment & cover gasket




Here is where I start on every diesel that is new to me..

Algae/Fungus fixation...
Algae/Fungus fixation...

Biobor, what is it, why do I need it???
http://www.peachparts.com/shopforum/diesel-discussion/105304-biobor-what-why-do-i-need-post723857.html

Filters, Fungus, Biocide, etc.
http://www.peachparts.com/shopforum/diesel-discussion/115952-filters-fungus-biocide-etc-post823378.html

Algae Clogged Filter Pic StarTron WORKS !
Algae Clogged Filter Pic StarTron WORKS !

*************************************************


Here is some educational information for you..



Diesel owners need to know fuel data
Diesel owners need to know fuel data


Emptying the fuel tank
Emptying the fuel tank

Why do I have vacuum in my diesel tank.....................?
Why do I have vacuum in my diesel tank.....................?

Fuel Tank Light
Fuel Tank Light

Fuel Gauge and Sending Unit threads
Fuel Gauge and Sending Unit threads

Fuel Sender 85 300D- Cleaned (Pics)
Fuel Sender 85 300D- Cleaned (Pics)

MB diesel filtration, how it works.
http://www.peachparts.com/shopforum/diesel-discussion/141211-mb-diesel-filtration-how-works-post1055075.html

fuel filter change
http://www.peachparts.com/shopforum/diesel-discussion/112664-fuel-filter-change-post824006.html

Diesel filters, no tank strainers please.
http://www.peachparts.com/shopforum/diesel-discussion/140349-diesel-filters-no-tank-strainers-please-post1046422.html?posted=1

Primary filter melted by biodiesel?
Primary filter melted by biodiesel?

I'm baffled and at wit's end!?!?!?!?!
I'm baffled and at wit's end!?!?!?!?!

300SD Fuel Filter Replacement Instructions
300SD Fuel Filter Replacement Instructions

240D fuel tank removal and cleaning
Good for any W123 sedan.
http://www.peachparts.com/shopforum/diesel-discussion/92826-240d-fuel-tank-removal-cleaning-post813925.html

Check out this fuel pickup screen
Check out this fuel pickup screen

W123 Fuel Tank Screen Replacement
W123 Fuel Tank Screen Replacement

Valve adjustment OM615, 616, 617 FYI.
Valve adjustment OM615, 616, 617 FYI.

Diesel Timing Chain Links Thread
http://www.peachparts.com/shopforum/diesel-discussion/162071-diesel-timing-chain-thread-post1251434.html

Run away diesel, why does it happen?
Run away diesel, why does it happen?

Worried about Carbon, head, piston, and pre-chamber
Worried about Carbon, head, piston, and pre-chamber

Inline diesel Injection Pumps
FYI: Inline diesel Injection Pumps

Italian Tune up
http://www.peachparts.com/shopforum/general-information/145498-italian-tune-up-links-thread-post1095223.html

Strong nailing
Strong nailing

Delivery Valve Leak issues thread
Delivery Valve Leak issues thread

Injector + Heat shield + Nozzle, Prechamber + Collar and Nailing. LINK THREAD
Injector + Heat shield + Nozzle, Prechamber + Collar, and Nailing. LINK THREAD

Fuel only dribbles from removed injector line when cranking at WOT
http://www.peachparts.com/shopforum/diesel-discussion/296062-fuel-only-dribbles-removed-injector-line-when-cranking-wot-post2684156.html

How forcefully will fuel come out of injector lines
http://www.peachparts.com/shopforum/diesel-discussion/194197-how-forcefully-will-fuel-come-out-injector-lines-post1563783.html

Here's my payback! Diesel Primer Pump Replacement
Here's my payback! Diesel Primer Pump Replacement

Drip Timing Threads
Drip Timing Threads

Help: What oil goes into Injector Pump??
Help: What oil goes into Injector Pump??

Diesel Injection Pump Timing Device threads
Diesel Injection Pump Timing Device threads

OM616/617 Injection Pump.
How to adjust the Naturally Aspirated Injection Pump.
http://www.peachparts.com/shopforum/diesel-discussion/99944-om616-617-injection-pump-post678986.html

'75 240 D M-style IP Theory - Help!
http://www.peachparts.com/shopforum/diesel-discussion/82731-75-240-d-m-style-ip-theory-help-post532895.html

Fuel injection pump diagrams???
Fuel injection pump diagrams???

IP Timing
IP Timing

Setting timing with IP lock tool.... Why won't the plunger set?
Setting timing with IP lock tool.... Why won't the plunger set?

Adjusting injection pump timing without setting cam timing
http://www.peachparts.com/shopforum/diesel-discussion/143442-adjusting-injection-pump-timing-without-setting-cam-timing-post1077248.html

Injector pump timing
http://www.peachparts.com/shopforum/diesel-discussion/168247-injector-pump-timing-post1310290.html

Diesel Timing Chain Link Thread
http://www.peachparts.com/shopforum/showthread.php?p=1251434

IP Destroying Injectors, GP, and Prechamber? [long]
IP Destroying Injectors, GP, and Prechamber? [long]

Fuel injection pump starvation with good a good lift pump
http://www.peachparts.com/shopforum/diesel-discussion/247039-fuel-injection-pump-starvation-good-lift-pump-post2133911.html

Fuel pressure relief valve adjustment
Fuel pressure relief valve adjustment

lift pump test
1979 300td -- Can anybody walk me through a lift pump test?

fuel pressure
http://www.peachparts.com/shopforum/diesel-discussion/249082-fuel-pressure-post2156755.html




.

__________________
ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/