617 into 115 Swap Questions - Page 2 - PeachParts Mercedes-Benz Forum

Squiggle Dog · #16 12-28-2018, 09:59 PM

Quote:

Originally Posted by gmog220d

M-B put a OM617 into W115, the first 300D. I'm relatively certain there's no need to modify the sub frame, unless there's a difference in the upper oil pans between 617s installed in W115 vs other chassis that had 617s.

What are you using for engine support arms? If you were planning on making them you can avoid the hassle by sourcing a pair of factory arms. You might also require a different transmission mount bracket, and a different length front driveshaft section. Shift rods could also be different lengths.

There are differences in the upper oil pan between the W115 and W116 OM617 engines and the later W123 and W126. The upper oil pan from a W123 and W126 OM617 is too fat and you'll have clearance issues installing one into a W115--so you have to either swap out the upper oil pan to a W115 or W116 one, or cut out a notch in either the upper oil pan or the subframe.

gmog220d · #17 12-29-2018, 04:27 PM

Quote:

Originally Posted by Squiggle Dog

There are differences in the upper oil pan between the W115 and W116 OM617 engines and the later W123 and W126.

Thanks for letting me know!

ROLLGUY · #18 12-29-2018, 09:39 PM

Quote:

Originally Posted by Squiggle Dog

There are differences in the upper oil pan between the W115 and W116 OM617 engines and the later W123 and W126. The upper oil pan from a W123 and W126 OM617 is too fat and you'll have clearance issues installing one into a W115--so you have to either swap out the upper oil pan to a W115 or W116 one, or cut out a notch in either the upper oil pan or the subframe.

The N/A oil pan from a W115 or W123 will NOT work on a turbo OM617. The only oil pan (upper and lower) that will work on your engine is one from another turbo engine'd chassis (W116, W126, W123).

Squiggle Dog · #19 12-29-2018, 11:48 PM

Quote:

Originally Posted by ROLLGUY

The N/A oil pan from a W115 or W123 will NOT work on a turbo OM617. The only oil pan (upper and lower) that will work on your engine is one from another turbo engine'd chassis (W116, W126, W123).

Well, that sure narrows down a person's options considering not many W116 300SDs were made. I see now why people cut the subframe.

luketmarx · #20 12-30-2018, 12:52 AM

Thanks all for the ideas and input.

My keeper car is a '76 240D with gorilla pull start, 4 cyl. It's also a standard transmission.

I'll try to find a non-ARV housing, anyone got one?

Otherwise I'll see what needs to be done to plug 'er up.

Someone who did a similar swap before said the problem is in the upper oil pan, and I can't change it. He e-mailed me pics of how he had to cut away the sub frame, basically in half length-wise, then welded plates over. I know this will significantly weaken the unit, even if it was over-built to begin with. My plan is to weld in some L-channels inside the sub-frame before I cover it with plates, will get some of the rigidity back. We'll see how it goes.

So, plan will be to keep my current manual transmission. I'm going to have the flywheels tested for balance and matched if required. I'll have to do a custom driveshaft length, and adjust the shift lever rod lengths. I believe I'll be able to re-use engine mounts, probably the arms from the '84 SD will be kept and bolted into the w115, but we'll see how it all fits up. I hope to keep my w115 radiator, though will see how it does in keeping the 617 cool. I did just get it rodded out, so, we'll see.

I welcome more ideas and thoughts!

JB3 · #21 12-30-2018, 07:14 PM

Issues you will run into-

As mentioned you need to notch the subframe. Simple. I took about 2 inches out

2- as mentioned the oil filter housing will simply not fit, needs to be a remotely mounted solution and will still be tight.

3- not mentioned the injection pump will hit the stiffening supports from the firewall on one side, and the turbo on the other side. These need to be removed. My swap car was a 4cyl so maybe they arent on a 5, but either way engine wont fit with them in if they are in place.

4- the battery needs to be relocated. The power steering pump on the later engine will occupy the same space. I cant recall if i had to notch there as well, but maybe.

Those 4 major changes and a tuebo engine will sit nicely in the 115 bay.

luketmarx · #22 12-30-2018, 08:41 PM

Quote:

Originally Posted by JB3

Issues you will run into-

As mentioned you need to notch the subframe. Simple. I took about 2 inches out

2- as mentioned the oil filter housing will simply not fit, needs to be a remotely mounted solution and will still be tight.

3- not mentioned the injection pump will hit the stiffening supports from the firewall on one side, and the turbo on the other side. These need to be removed. My swap car was a 4cyl so maybe they arent on a 5, but either way engine wont fit with them in if they are in place.

4- the battery needs to be relocated. The power steering pump on the later engine will occupy the same space. I cant recall if i had to notch there as well, but maybe.

Those 4 major changes and a tuebo engine will sit nicely in the 115 bay.

3- did you remove the stiffening supports? Run into problems doing that?

4- I had considered that possibility...had thought of putting the battery under the rear seat. I know I’d loose a few cranking amps, but thats ok. I could always do a dual battery setup. If I did this, I’d put them in plastic battery cases.

Thanks for the notes!

Squiggle Dog · #23 12-30-2018, 09:16 PM

Look at this W115 that had an OM617 turbo swapped into it. Where is the oil filter?

I like how they were somehow able to install an air compressor up top, like on a naturally aspirated engine.

ROLLGUY · #24 12-30-2018, 09:44 PM

Quote:

Originally Posted by Squiggle Dog

L

I like how they were somehow able to install an air compressor up top, like on a naturally aspirated engine.

They probably used the same bracket used on the N/A engine.

mabbonizio · #25 12-30-2018, 09:54 PM

I wonder if the oil filter housing from an older 616 would bolt up to the 617A?

Squiggle Dog · #26 12-30-2018, 10:08 PM

Quote:

Originally Posted by mabbonizio

I wonder if the oil filter housing from an older 616 would bolt up to the 617A?

The ones that mount down by the oil pan won't as there aren't any threaded holes or holes or plugs on the turbo block in that location, and on the turbo engines the pistons get oil squirted on them through a passageway from the location of the oil filter housing.

The original naturally aspirated OM617s that came in the W115s had the oil filter housings located down by the oil pan, and I guess a person could use one of those blocks and add a turbo head and a turbo to the block, but the pistons probably wouldn't get oil-cooled like a turbo block.