87 mercedes 300td, noticed it has become noisier than normal.
On starting blue smoke for a short time also present in the exhaust. Removed the valve cover saw hydraulic lifters so no adjustment. Added lucus injector cleaner hoping to clean out the injectors. Wondering if there is a pcv valve or some sort of clogged emissions part clogged causing oil to mix in the fuel and make it noisier and cause the smoke.
thanks for all the help. carmen

87 mercedes 300td, noticed it has become noisier than normal.
On starting blue smoke for a short time also present in the exhaust. Removed the valve cover saw hydraulic lifters so no adjustment. Added lucus injector cleaner hoping to clean out the injectors. Wondering if there is a pcv valve or some sort of clogged emissions part clogged causing oil to mix in the fuel and make it noisier and cause the smoke.
thanks for all the help. carmen
Sixto you are awesome!

The belt tensioner damper can make a lot of noise. Mine sounds like there are marbles in the engine. Put pressure on the upper attachment of the damper and/or pry it away from the head. Don't slip and hit the fan! If the noise quiets, you need a new damper. MB brand dampers cost more but last a lot longer than other brands.

Is the smoke consistent or does it clear as the engine warms? It might be a lazy glow plug. If it smokes all the time, I'd check IP timing and run a can or two of Lubro Moly Diesel Purge directly, not diluted in the fuel tank, to see if that helps. There's also an Italian tune-up. If possible to do safely and without risk to your license, run with the fast crowd in the left lane in third gear for a few miles. Mind the engine temperature gauge. Hopefully the smoke will clear in a couple of miles. Otherwise they'll impound your car, put you in jail and make you drive an electric car

Other sources of oil into the combustion chambers are worn valve stem seals or guides, worn turbo seals, excessive blowby, etc. which require extensive engine work, but don't typically cause more engine noise.

Sixto
87 300D

Smoke clears on warm up even before warm up. The noise bothers me more than the smoke. Checked the tensioner no change. Its not a marble noise more of a clatter like a lifter is not adjusted properly, but obliviously no adj. possible. What is the IP timing?
Could the oil be from a dirty banjo bolt? I tried to find the bolt after an hour of searching gave up. Figured I should clean it after 115,000 miles.
What does the Italian tune-up do, other than cause a lot of smoke?
Carmen

I suspect a lazy glow plug. An easy test is to check resistance between the glow plug relay connector and each glow plug. Remove the 6-pin connector in the glow relay and measure the resistance of each socket to ground. You should see 1.7 to 1.9 ohms for each. If there is a higher number or zero, there is a bad glow plug or bad wire to that glow plug. The connector sockets are numbered corresponding to the cylinder from front to back.

Is the noise a rhythmic clacking? Maybe you have a worn or clogged lifter.
A possible cause is the head gasket disintegrating which is likely if you see oil leaking on the front passenger side. Eventually the alternator will be grimy. Bits of the head gasket clog the oil passages for the lifters which make noise because of insufficient oil pressure. It can also be caused by improper oil service; infrequent oil changes, incorrect grade and weight oil, etc. Many have cleared the noise by using synthetic oil such as Mobil 1 Turbodiesel and Truck formulation.

The injection pump is driven by the engine. Optimal combustion relies on proper timing of the injection pulse to each cylinder. Over time IP timing can slip because of chain wear and wear of other components.

An Italian tune-up can clear build-up of soot from lazy driving.

Sixto
87 300D

Wonder if the vacuum pump is starting to call it a day? Might try to localise the source of the noise with a stethoscope type device. The vacuum pump failing may not be adding to the smoke though.

to correct forum for answer.

.

There are several possible issues that are SUDDEN.
Here are a few.

Bad fuel is the most abrupt, and easiest to fix.
http://www.peachparts.com/shopforum/diesel-discussion/309367-warning-all-diesel-owners.html

Failed seals or micro fracturing of these, allows random air into the fuel system = extreme injection fuel variation = improper combustion.
OM603.960 and .961 Plastic fuel lines, injection pump,


Failed seal or micro fracturing of the cover, allows random air into the fuel system = extreme injection fuel variation = improper combustion.

COVER, DIESEL FUEL THERMOSTAT
6010780016

O-ring
MB# 0119973948


.

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