Help me pick a car

Vincent Keene · **Posted:** Fri Feb 20, 2015 11:06 am

RodneyWright wrote:

ouch.... what happened?

C.O.O. might be a clue.

Chuck Branscomb · **Posted:** Fri Feb 20, 2015 11:29 am

Aaron Buckley wrote:

While I'm sure this isn't fun, it's cool to see the recirculating ball steering sitting in the engine bay. Hopefully it goes well Mike. - AB

Looks like a rack and pinion? Recirc ball would have a steering box and an arm coming off it, center link anchored on other side then tie rods off center link on each side.

MikeWhitney · **Joined:** Wed Aug 20, 2003 9:15 pm **Posts:** 4724

You can read all the gory details here:

http://www.benzworld.org/forums/w220-s- ... knock.html

Cliffs - One cylinder developed a death-spiral piston slap. No discernable root cause. Never heard of this happening before. Everything else looks perfect - all other 7 cylinders, heads, cams, crank, bearings. Weird, huh?

Apparently the germans have a name for this, "Kolbenfresser".

Scott Johnson · **Posted:** Fri Feb 20, 2015 2:07 pm

I see a few problems there.

1) The engine bay is empty.
2) I'm pretty sure the engine is upside down. It's bound to burn oil that way.

Scott Johnson · **Posted:** Fri Feb 20, 2015 2:18 pm

In case you hadn't thought of it, this is the perfect time for long tube headers.

Jason Mauldin · **Posted:** Fri Feb 20, 2015 2:47 pm

Scott Johnson wrote:

In case you hadn't thought of it, this is the perfect time for long tube headers.

Good point.

I recommend these headers:
http://marylandspeed.com/kooks-1-78-lon ... p-499.html

Richard Casto · **Posted:** Fri Feb 20, 2015 3:23 pm

MikeWhitney wrote:

You can read all the gory details here:

http://www.benzworld.org/forums/w220-s- ... knock.html

Cliffs - One cylinder developed a death-spiral piston slap. No discernable root cause. Never heard of this happening before. Everything else looks perfect - all other 7 cylinders, heads, cams, crank, bearings. Weird, huh?

Apparently the germans have a name for this, "Kolbenfresser".

I read the thread on the MB forum. Good luck on the rebuild. I know little about piston slap causes other than excessive clearance (especially when cold). Thinking VERY much out of the box... Does that engine have per piston oil squirters? Maybe something wrong with lubrication and/or cooling on that one cylinder?

Richard

MikeWhitney · **Joined:** Wed Aug 20, 2003 9:15 pm **Posts:** 4724

Richard Casto wrote:

MikeWhitney wrote:

You can read all the gory details here:

http://www.benzworld.org/forums/w220-s- ... knock.html

Cliffs - One cylinder developed a death-spiral piston slap. No discernable root cause. Never heard of this happening before. Everything else looks perfect - all other 7 cylinders, heads, cams, crank, bearings. Weird, huh?

Apparently the germans have a name for this, "Kolbenfresser".

I read the thread on the MB forum. Good luck on the rebuild. I know little about piston slap causes other than excessive clearance (especially when cold). Thinking VERY much out of the box... Does that engine have per piston oil squirters? Maybe something wrong with lubrication and/or cooling on that one cylinder?

Richard

Yep, it has oil squirters ... The stronger M113k (kompressor) pistons have no rod oil passage like the plan M113 pistons. So the squirters are responsible for lubing the wrist pin and apparently the cylinder walls.

So it's still entirely possible that the PO ran the motor out of oil, and this was the first failure. But it's just weird that nothing else is damaged!

DickRasmussen · **Posted:** Fri Feb 20, 2015 4:58 pm

Your hobby is doing this kind of stuff with cars. Mine is reading about you doing it.

Jordan Normark · **Posted:** Fri Feb 20, 2015 5:03 pm

It looks like those are aluminum cylinders, or is there a steel liner? Seems like steel cylinders would have faired the scuffing better and could possibly have been bored over. Then again parts alone for that engine would probably cost more than another car. Such is the world of luxury sedans.

Pete Guthrie · **Posted:** Fri Feb 20, 2015 5:07 pm

too bad,you could have gone to shocauto.com and gotten real german memoribillia///cheap to run,small,agile for whta it was..german, the immortal trabant.

MikeWhitney · **Joined:** Wed Aug 20, 2003 9:15 pm **Posts:** 4724

Jordan Normark wrote:

It looks like those are aluminum cylinders, or is there a steel liner? Seems like steel cylinders would have faired the scuffing better and could possibly have been bored over. Then again parts alone for that engine would probably cost more than another car. Such is the world of luxury sedans.

High-silicon aluminum cylinders. AMG engine part prices are insanity, but fortunately used engines aren't so bad.

Already have a 49k mile donor about ready to go back in.

I'm pretty impressed with how well everything is designed, engineered, and manufactured on these engines. They're nice.

Have more $$ in the car than I had hoped, hopefully I can sell the heads or other motor parts.

Chad Culbertson · **Posted:** Fri Feb 20, 2015 9:04 pm

In regards to aluminum cylinders, I got curious and came across this wiki article about a plating process used in some engines. It doesn't really mention MB piston engines, but i'm sure they do something similar.

http://en.wikipedia.org/wiki/Nikasil

The most interesting bit I think was that it mentions Nikasil can wear harder than iron or chrome cylinders. Obviously the downside is in cases like this where you could probably fix it, but it would require recoating which i'm sure is really expensive to get done.

Donnie Barnes · **Posted:** Fri Feb 20, 2015 9:45 pm

Do I win a prize for suggesting you buy something to do a motor swap on even though you said you didn't want to do a motor swap project?

Because guess what? You did a motor swap.

*ducks and runs*

--Donnie

clinehall · **Posted:** Mon Feb 23, 2015 12:10 am

Donnie Barnes wrote:

Do I win a prize for suggesting you buy something to do a motor swap on even though you said you didn't want to do a motor swap project?

Because guess what? You did a motor swap.

*ducks and runs*

--Donnie

I don't think this qualifies as a motor "swap". I would think a swap would be different engine, this is a simple engine replacement. BTW, I don't think I want first right of refusal on this one.

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