View Single Post
  #12  
Old 01-02-2010, 12:08 AM
whunter's Avatar
whunter whunter is offline
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,354
Answer:

Quote:
Originally Posted by Dovetail View Post
Hello all:
I have a 1980 300SD with 210,000 on it. It was previously owned by my cousin (since 1982), and was his daily driver until about 10 years ago. He meticulously cared for it up until that point, however his mechanic, although a popular independent mechanic in the Pasadena, CA area, is not someone who I would take my car to. They used 20/50 wt Pennzoil, which was regularly changed. Over the last 10 years this has been his second car, and approximately 10,000 miles were put on it over that time period, as well as run on homemade bio-diesel (made by his mechanic). The maintenance was benign neglect. His wife started it one day and it went into runaway (not traveling, but while in park). She had to call the fire dept who stopped it by blocking the turbo intake. After that the car was gladly given to me. His mechanic thought it was the fuel injector pump (stuck fuel rail), and had it partially dismantled. I found a good used injector pump, swapped it out, and got the car running. 6 degrees of off timing was noted so I rolled a new chain in. It now runs very nicely, however has a loud knock when cold (always had this), and despite new injector nozzles, still has the knock which goes away when warm. However, the most obnoxious thing is that it smokes really bad, and has significant blow-by. It is a little slower than other turbo diesels I have had, but still has respectable off the line speed and power under load (when warm). Before I put any more effort into this I figured I should check the compression. The readings I got were:

27
23
27
27
27

So the question is, is the 4 bar difference significant? Could that be the origin of the smoking grayish exhaust? The blow-by? By the way, despite several tanks of diesel the exhaust still smells like McDonald's. Do you think more time and money should be invested? I am thinking I will see if new valve stem seals will help, but I hate to invest much in it if I can not get rid of the smokey exhaust. Any comments would be appreciated,
Will
The smoking sounds suspiciously like this thread. His issue was resolved after replacing the injection pump with the third used unit..

wont start for anything!
wont start for anything! 1985 300SD

The startup knock could be.

Strong nailing
Strong nailing

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


Please read the following thread for a full education on all causes of RUNAWAY.

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



The following links will help you.


Engine blow-by test, Blow a bag of blow-by
Engine blow-by test, Blow a bag of blow-by

Blow-By curiosity questions
http://www.peachparts.com/shopforum/diesel-discussion/188320-blow-curioisty-questions-2.html#post1798266

Valve adjustment OM617 FYI.
Valve adjustment OM615, 616, 617 FYI.

What is a Leak Down Test?
http://www.peachparts.com/shopforum/diesel-discussion/92810-what-leak-down-test.html#post618072

Diesel cylinder head issues thread
Diesel cylinder head issues thread

615, 616, and 617 head bolt torque sequence
om615, 616, and 617 head bolt torque sequence

OM616 and 617 Engine Rebuild threads
OM616 and 617 Engine Rebuild threads

How to Replace Your Shutoff Valve
http://dieselgiant.com/repairyourshutoffvalve.htm

Oil in Engine Shutoff Valve 300sd
http://www.peachparts.com/shopforum/diesel-discussion/175849-oil-engine-shutoff-valve-300sd.html#post1383468

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

Cold weather starting links
http://www.peachparts.com/shopforum/diesel-discussion/137674-cold-weather-starting-links.html#post1018529

Delivery Valve Leak issues thread
Delivery Valve Leak issues thread

ALDA issue threads
ALDA issue threads

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.html#post1563783

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

Drip Timing Threads
Drip Timing Threads

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.html#post678986

OM617 IP, oil leak from fuel pump gasket
OM617 IP, oil leak from fuel pump gasket

Vacuum Diagrams W123 and W126 models
Vacuum Diagrams

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

IP Full Load Adjustment 617 Turbo
http://www.peachparts.com/shopforum/diesel-discussion/214412-ip-full-load-adjustment-617-turbo-post1772106.html

Specialized Indicator for IP Timing
Specialized Indicator for IP Timing

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.html#post1077248

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

Injection Pump Timing Adjustment for 617 Engines
http://207.210.95.34/~boostd/easley/iptiming.htm

Ip rack return spring r&r
Ip rack return spring r&r

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

Leak-down Tester and ?'s
http://www.peachparts.com/shopforum/diesel-discussion/57178-leakdown-tester-s.html#post999381

so, what does that rack damper bolt (617) actually do?
http://www.peachparts.com/shopforum/diesel-discussion/183139-so-what-does-rack-damper-bolt-617-actually-do.html#post1458468

Part# rack dampener pin for 1985 300SD
http://www.peachparts.com/shopforum/diesel-discussion/120005-part-rack-damper-pin-1985-300sd.html#post858324

Adjusting the Rack Damper Bolt
http://articles.mbz.org/engine/diesel/rackbolt/

Replacing Rack dampener pin
http://www.peachparts.com/shopforum/diesel-discussion/176580-replacing-rack-dampener-pin.html#post1391845

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.html#post2133911

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

Bosch Fuel Injection, Link to certified shop locater
http://www.boschservice.com/ServiceLocations/DieselServiceCenter/Diesel+Service+Center.htm


Have a great day
__________________
ASE Master Mechanic
asemastermechanic@juno.com

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.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
Reply With Quote