Thinking About a 1994 SD

[oilslick]

Number one cylinder is in trouble. Using a quart every 250 miles. Just want to know if anyone on here has ever put a 6cyl out of an earlier SDL into a
w140? Will the trans bolt right up? What about wiring harnesses and such? Too much trouble?

The original owner still has the car. It has 150,000 miles. He said this car turned him against Mercedes till the day he dies. It stays parked under the shed and he may crank it every month or so. He told me that he has tried to get the rod to come through the block but so far no success. He had MB check it out and told him that number one cyl is ovaling. I can buy the car cheap enough and know about a few earlier OM603's I can purchase.

Just curious....i heard that killed a cat one time!

Kevin

[aaa]

Swapping won't be hard, everything will be bolt on.

[Brian Carlton]

Sixto is your best resource on that swap.

It's not quite as straightforward as a swap into a W126, but I seem to recall that it can be done with some effort.

[NJ300sdl]

How do they know it is the cylinder? Oil passage in head gasket failed at number 1 on my S350.

[oilslick]

That information is coming from the owner. He got the info from MB dealer. If an oil passage is all it is then that would be easy enough.

Kevin

[sixto]

Originally Posted by oilslick

He told me that he has tried to get the rod to come through the block but so far no success.

How does one go about doing this? And WHY?

A tech would need x-ray vision to know a cylinder is ovaled without pulling the head.

Swapping the short block is easy. Just move everything from the 3.5 short block to the 3.0 short block and go. It won't even look different. You have to decide whether to run a 3.0 or 3.5 IP, 3.0 or 3.5 turbo, etc. It's all nuts and bolts. No fabricating.

Sixto
87 300D

[Brian Carlton]

Originally Posted by sixto

How does one go about doing this? And WHY?

A tech would need x-ray vision to know a cylinder is ovaled without pulling the head.

Swapping the short block is easy. Just move everything from the 3.5 short block to the 3.0 short block and go. It won't even look different. You have to decide whether to run a 3.0 or 3.5 IP, 3.0 or 3.5 turbo, etc. It's all nuts and bolts. No fabricating.

Sixto
87 300D

Sixto, didn't you need the 3.5 IP due to the computer control on the W140??

[compu_85]

The turbo is computer controlled, but the IP is not (apart from idle)

-J

[Brian Carlton]

Originally Posted by compu_85

The turbo is computer controlled, but the IP is not (apart from idle)

-J

Excellent.

Thanks.

[aaa]

No electronic shutoff actuator?

[Edward Wyatt]

IMHO, run away, or else you might as well flush $100 notes down the toilet.

I had the chance to buy an otherwise mint similar example a few months ago for 3k, no thanks. Diesel fuel is no longer cheaper than regular unleaded, and the car is a running basket case.

[compu_85]

Originally Posted by aaa

No electronic shutoff actuator?

From what I have seen it has an electronic valve that switches vacuum on and off

[ashedd]

Do IT!!!!

[barry123400]

Originally Posted by NJ300sdl

How do they know it is the cylinder? Oil passage in head gasket failed at number 1 on my S350.

Leakdown test might separate the issues. With some oil introduced the loss rate should decrease.

Or with the lower oil pan off if easily Done.

[sixto]

I kept the 3.5 IP because all I got was a 3.0 short block. I rarely rev beyond 3500 rpm so it doesn't matter to me that the 3.5 IP has a more restrictive governor.

The 3.5 wastegate can be modified for boost control per gsxr's 2.5 instructions. I haven't found sufficient information to diagnose the EDS. Maybe if it had proper OBD...

No added electronics to the IP that I noticed. Just the ELR that looks like the 3.0 ELR.

The 3.5 has the same shut-off actuator as the 3.0. There's a VCV very much like the overboost switchover valve that allows brake booster line vacuum to the shut-off actuator when unpowered, and vents the actuator when unpowered.

Sixto
87 300D