Putting a 116 617 into my 126. - PeachParts Mercedes-Benz Forum

cmac2012 · #1 10-23-2007, 09:29 PM

Gonna take all the accessories off of my 617 motor in my 126 ('81 300SD) and put them on the new/used block I got at a boneyard out of a '79 116 300SD. The odo read 113K, the interior was in good shape and it landed there because of a hard sideswipe on the passenger side. I turned the motor with a wrench just in case -- felt smooth.

I'm wondering how much I should do after I put the block in and how much before. Seems like if I carefully took most of it off while the old block is in the car, took off existing stuff from new/used block, and then put in the stripped block it would be easier to get back in. Less weight and stuff in the way.

I can easily imagine that this might be advantageous for some items and not so for others. Anyone know? This is my first Benz and I've never had the engine out.

Also, any idea on what gaskets I should by up front? I can guess on several but I imagine there are some I don't know about.

I've already been told that I need to put the exhaust manifold and turbo from my old engine onto this 116 item. May as well swap everything. Not sure how to determine which components are superior from which engine. Coincidentally, the exhaust man. and turbo were missing at the boneyard but everything else was still bolted on.

LUVMBDiesels · #2 10-24-2007, 10:54 PM

You will need to remove the oil filter and swap them. Take the entire thing with the oil cooler as it is easier to swap the entire assembly than it is to take the cooler off. The 126 has an electric oil pressure gauge as well. Go to the dealer as they should have the oil filter housing gasket in stock.
I would also remove the air conditioner compressor from your car's engine and hang it up so that you do not have to open the hoses and redo your gas.

Other things to watch out for are the accelerator linkages as they are different. I would probably swap the valve cover from your engine to make sure the linkages are correct. Get a valve cover gasket from Phil or the dealer when you get the oil filter housing gasket. ummm you should also replace the little 1.5 inch hose on the thermostat housing. Phil has that hose in stock.

That's all I can think of right now. Search for Engine swap posts under my userid as I have swapped the engine from a W123 into a W126 and the process is similar.

Good luck!!
Oh motor mounts will be different so swap the arms from your engine. You should also buy a new set of rubber mounts and the engine shocks so you can replace them as part of the swap.

cmac2012 · #3 10-24-2007, 11:57 PM

Excellent advice. Many thanks. I think I'll replace the thermostat while I'm at it just for good luck. Damn, I want to get this car running again. It's been about 6 months at least.

vstech · #4 10-25-2007, 12:06 AM

methinks you have to swap over the oil pan and oil pump... maybe just the pans. do a measure to be sure everything will fit first, but if it looks good, great. I also think there are some sensors in the head, that need to be swapped. the glow plug system is different, I think there is a sensor in the head on one, that needs to be in the waterneck on the 126. be sure and compare them thoroughly.

Palangi · #5 10-25-2007, 10:50 PM

So you've got a broke Benz and a broke Bimmer??

Wow, like, bummer dude.....

It must be Bush's fault somehow....

FWIW, here's a discussion on another forum that sounds like a similar situation:

http://www.schumanautomotive.com/forums/showthread.php?t=4938

Hope it works out OK, sounds like a big job.

ConnClark · #6 10-26-2007, 12:16 PM

You might want to swap cams and everything that is associated with it(towers, etc). In the later years they increased the size of the lobes to improve the engines ability to breath. I'm not sure if it was done to the 81, it may be the 82 when they started doing it so you might want to measure before you do the swap. Also the injector orifice was enlarged at the same time so consider swapping those too.

bgkast · #7 10-27-2007, 01:47 AM

Quote:

Originally Posted by ConnClark

You might want to swap cams and everything that is associated with it(towers, etc). In the later years they increased the

I think it was 80, I remember finding out that the '80 W116 SD engine in my 240D had the new cam.

cmac2012 · #8 10-27-2007, 03:27 AM

Quote:

Originally Posted by Palangi

So you've got a broke Benz and a broke Bimmer??

Wow, like, bummer dude.....

It must be Bush's fault somehow....

FWIW, here's a discussion on another forum that sounds like a similar situation:

http://www.schumanautomotive.com/forums/showthread.php?t=4938

Hope it works out OK, sounds like a big job.

Has to be Bush's fault. Damn sure can't be mine.

Oh man, this is not good for the kid. Fortunately, the broke Bimmer story took a turn for the much better. I'll have it up and running in no time. Good thing, cause my work van, which I only use when I have to, gets 10 mpg.

It has a 30 gallon tank and it's tough to watch the better part of a C-note disappear to fill up the tank.

I need to get the Benz going cause it's great for a work vehicle -- big trunk -- and there's a real cutie working at the Berzerkletown bio-diesel outlet. Haven't seen her in awhile. It's called Bio-fuels Oasis and it's a collective run by women. Only in B-Town.

Hey, good tip on the thread. I may actually be talking to BHD again. Who'd a thought?

cmac2012 · #9 10-27-2007, 03:31 AM

Quote:

Originally Posted by ConnClark

You might want to swap cams and everything that is associated with it(towers, etc). In the later years they increased the size of the lobes to improve the engines ability to breath. I'm not sure if it was done to the 81, it may be the 82 when they started doing it so you might want to measure before you do the swap. Also the injector orifice was enlarged at the same time so consider swapping those too.

Oh man, that's good advice. Don't know why exactly, but my 617 seemed somewhat more zippy than either of my friend's 123 300Ds. He even noticed it when he drove my rig.

I'd hate to end up with a wimpier engine than I had.