Mercedes-Benz Forum banner

1 - 7 of 7 Posts

·
Registered
'84 300TD 200k?miles,
Joined
·
14 Posts
Discussion Starter #1
My son was driving our '84 300TD, when to his untrained anything cars, he called me and said it was losing power and smokiing and pulled over onhis way home form school and I wnent to pick him up. Towed the car to my Benz mechanic, and his asessment was the fuel may have algee from the tank, and since it was getting colder, maybe we didnn'tknow the proper stat procedures. I could buy that. Actually what I bought was new fuel filters, also replaced the ignition switch so the blower would work, (we could pull slightly back on the key and have it work), and installed a hose to redirect the coolant through the heater core to give us heat (it had been bypassed) He did mention the coolant was empty for which I replied, there is no leaking in my garage or otherwise any where else. We have carefully monitored the floor of the garage since acquiring the car last May. He also mentioned his mechanic could notice a smell when idling the car which he thought might be coolant, and we could be burning coolant, "keep an eye on it". I drove the car a few blocks to my office, noticed a bit of grey and white smoke coming out of the exhaust, thought it may have been from sitting a few days. Upon leaving the office for my 17 mile drive home, wverything was fine for the first half of the trip and then the temp went straight up, maor smoke from the eshaust. I stoped the car and noticed no coolant in the reservior, maybe a litttle oily residue. The dipstick was way over the top, but the oil was very thick and seemed to be in decent shape.

My question is how can a mechanic miss a cracked block or head? How can a car run with the coolant running into the engine? No fluid anywhere on the ground or coming out of the eshaust. And what is my prognosis? Kill the car or replace the engine? Any ideas? How difficult is it to swap engines?
 

·
Registered
1984 300D
Joined
·
5,070 Posts
Bad Head Gasket, cracked Block (unusual for this to happen), crcked Cylinder Head (not to common either) all can happen inside of the Engine were no Mechanic can see them.

The Engine can still run with tiny amounts of Coolant seepig in. It turns to Steam and goes out of the Exhaust Pipe.

Another source of a Coolent leak can be a tiny pin hole somewhere in the system (exterior) that only leaks when the Engine is Hot. If the leak is small it evaporates due to the Heat of the Engine; so it does not leave a puddle on the ground.
 

·
Registered
83 300D Turbo
Joined
·
219 Posts
When the car is cold, start the car and look at the radiator fluid, do you see bubbles? This would indicate a head gasket or some sort of crack. I would bet it's a head gasket, that should not be to bad to replace.
 

·
Registered
Joined
·
507 Posts
Probably a head gasket problem. Coolant will sometimes end up going into the oil and you'll find a chocolate milkshake looking mess in there. It's not pretty.
 

·
Registered
1981 240D
Joined
·
185 Posts
BobinOH: This might be a silly question, but if you run the engine long enough to bring it to operating temps, but not long enough to 'burn' all of the coolant, how does the remaining coolant look in the reservoir? The reason I ask, is because when I first purchased my 240D I noticed the coolant was a milky brownish-green. I suspected that it might be cracked block, but after replacing the coolant, I ran the car for over a year and it remained clear and bright green. I am curious to hear more about your case. I don't know anything about the TD's. Is the oil cooler and radiator one piece or two?
 

·
Registered
1984 300TDt
Joined
·
265 Posts
the issue has been raised before.... but I will hit it again. there is a special coolant for these cars thats is supposed to be used.
 

·
Registered
1981 240D
Joined
·
185 Posts
the issue has been raised before.... but I will hit it again. there is a special coolant for these cars thats is supposed to be used.
There is a special coolant that has additional detergents to keep the radiator and water jackets clean and free of oxidization. I don't think it has anything to do with BobinOH's problem. It sounds as if water is entering his engine somehow.
 
1 - 7 of 7 Posts
Top