Free 84 SD. And a window question. - PeachParts Mercedes-Benz Forum

Manual Life · #1 05-19-2011, 07:56 PM

First the windows. On the w123 does anyone make a window switch replacement that allows auto "one push" roll down on the windows?

Second, the free 84 300SD with 160k miles It's a 2 tone blue/light blue with tan interior. Everything in and out is near perfect except for a small paint problem on the rear right quarter panel where the driver backed into something. The car has been sitting since 1999 in a climate controlled garage and every service has been done. The catch?

He says he was driving up a hill and it lost all power. He thinks it's a timing "belt," he said belt and meant chain, that went wrong. Even if it did a nice SD at the cost of an engine is a fair deal.

Hopefully its not the chain but we will see. I've heard that when the chains go the head/valves are usually fine its the cam and tower that needs replacing. Can anyone verify the legitimacy of that claim?

I have to go to Houston to get. Most likely the first weekend of June. If I don't want it I can put in a good word for someone on the forum. Of course I will have pictures by then. He owner didn't recall if it was an SD or SDL.

gatorblue92 · #2 05-19-2011, 08:39 PM

If it's an 84 it should be a SD. I don't think the SDL came along until 86.

vstech · #3 05-19-2011, 08:47 PM

ahhh.
wiNdow question... ya had me worried with widow! (massive jokes in the original thread title...)
anyway, I'm not aware of any "auto" conversions... sorry. let me know if you find any.

if the chain let go on the highway, likely the valves/head/pistons are toast. that's a LOT of revolutions with metal touching metal...

Manual Life · #4 05-19-2011, 11:22 PM

Quote:

Originally Posted by vstech

ahhh.

if the chain let go on the highway, likely the valves/head/pistons are toast. that's a LOT of revolutions with metal touching metal...

But if the chain called it quits wouldn't the valves just retract right into place? They, the valves, are very vertical so, we hope, the crank kept going while the valves sat in their seat?... a wild hope of course because I've never heard of such a thing.

Aquaticedge · #5 05-19-2011, 11:28 PM

if the cam is pressing a valve down when the chain goes I dont think it would retract because of the lobe pressing it down.

vstech · #6 05-20-2011, 12:28 AM

the problem is there is always a valve open on at least one cylinder, and when the cam stops, and the crank keeps turning... pow. right in the kisser...

charmalu · #7 05-20-2011, 02:50 AM

when the timing chain lets go, good by engine.

I had one break cruising at 65 mph, "What`s that noise"

. by then it is too late. there are quite a few revolutions on the engine from the time you hear it and you finally get stopped. had oil and coolant and wasn`t running hot, so after checking under the hood, decide to try to start it, Bang Bang Bang. Hmmm not good

I pulled the head, and a valve hit every piston, broke off first cam tower at the base, second one just under the cam, cracked the head, and the last rocker was twister around like a pretzle. but didn`t snap the cam shaft. Oh, and the valve cover had a crack down the side.

These engines are an interference engine when things go wrong.

hopefully this SD is an easy fix.

Charlie

Diesel911 · #8 05-20-2011, 10:57 AM

Loss of Power on Diesel Engines if often restricted or poor performing Fuel Supply System.

Changing the Fuel Filters is the first place to start.

It also might be that his Throttle Linkages have become Sloppy over time and the Throttle lever is not being pushed far enough. On my 123 part of the Throttle (Control) system is a Bell Crank on the Fire Wall. It pivots on a Plastic Ball behind the Bracket.

That Ball falls apart with age and the front portion of the Bell crank has a lamination of metal and Rubber that rotates the Throttle Rod. If the Rubber rots out the Rod is not going to mover properly.

Thin linkage you are speaking of may not be the same as mine but a Visual Inspection of the Linkages would be a resonabel thing to do.

Renntag · #9 05-20-2011, 11:33 AM

All good suggestions above. And I'll second the "broken chain, garbage motor" claim.

I found this to be funny....(always keep in mind that you are also saying that the counter of your comment to be true as well)

Quote:

Originally Posted by charmalu

...These engines are an interference engine when things go wrong...

So laugh with me for a second. (tongue in cheek):
So when things are 'good' they are no longer 'interference engines' by industry terms, and there for 'non-interference engines'?

How does the motor change like that?

note: a Non-interference engine is unique in that the piston at top center, never comes into the path of the valve at full lift. In the case of timing component failure (belt, chain or otherwise) there is typically no damage.

Are you going to share pictures of your 'free SD' ?

Manual Life · #10 05-21-2011, 06:29 PM

Quote:

Originally Posted by Diesel911

Loss of Power on Diesel Engines if often restricted or poor performing Fuel Supply System.

Changing the Fuel Filters is the first place to start.

It also might be that his Throttle Linkages have become Sloppy over time and the Throttle lever is not being pushed far enough. On my 123 part of the Throttle (Control) system is a Bell Crank on the Fire Wall. It pivots on a Plastic Ball behind the Bracket.

That Ball falls apart with age and the front portion of the Bell crank has a lamination of metal and Rubber that rotates the Throttle Rod. If the Rubber rots out the Rod is not going to mover properly.

Thin linkage you are speaking of may not be the same as mine but a Visual Inspection of the Linkages would be a resonabel thing to do.

Noted. When I get the over to the car the valve cover is going off to see the truth. I agree that it could be fuel related, linkage, turbo, etc. So my hopes remain high.