240D engine noise- engine coming out but any ideas? - PeachParts Mercedes-Benz Forum

w123fanman · #1 08-28-2014, 10:04 PM

My dad's 240D has been sitting a while but a friend, my brother, and I are determined to slowly restore it for my dad. Needs a lot of work but the transmission was rebuilt shortly before it had this issue (I don't know the exact details but my dad's employee was driving it when it happened). Suspension was also all replaced except shocks and a couple of bushings and the chassis is mostly rust free beside some minor surface rust.

We have already pulled the engine hoping to find an OM617 to swap in but before we get too far, I want you guys to take a listen and offer any ideas on what exactly went wrong with the engine. It has good compression and starts up fine (until recently when the starter motor and alternator stopped working all that great) but has a knock, seemingly from the 4th cylinder towards the top.

Here is a video: https://www.youtube.com/watch?v=TFuhODX9eZg&feature=youtu.be

leathermang · #2 08-29-2014, 01:56 AM

I wish you had asked while it was still in the car .......

cooljjay · #3 08-29-2014, 03:14 AM

Ditto that....

I personally would have removed the valve cover and checked the valves, and see whats up there...Am I see oil coming out of the tail pipe?

You may just have a broken valve guide, if that was the case....you could simply have the head rebuilt...

I also sort of hope, you realize a swap....includes a ton more then just dropping in an OM617...

w123fanman · #4 08-29-2014, 08:44 AM

I'm off at school and my friend sorta jumped the gun and pulled the engine before he did proper diagnostics. I do realize the swap (if we go through with it) is a lot more than dropping and OM617 in but I'm not sure my friend realizes that.

Dan Stokes · #5 08-29-2014, 08:57 AM

It sounds like a rod knock but could be a collapsed piston (not likely as those are pretty stout) or a failed wrist pin. Judging from the video sound (always dangerous) it seems too deep to be a valve train noise though you should certainly pull the valve cover and see what you see. Valve train noise is usually a lighter sound.

If I was a betting man I'd look for a beat-to-crap and maybe spun #4 rod bearing.

Dan

leathermang · #6 08-29-2014, 12:36 PM

Quote:

Originally Posted by w123fanman

;;;;;; my friend sorta jumped the gun....

We can agree on that for sure... really a kick in the stomach in terms of figuring out the problem in a reasonable fashion...

Your friend has NO IDEA at all how much trouble changing to the 617 will be.
Do you have the parts car the 617 is coming out of parked next to this car ?
That is about the best thing to have and do... two car widths apart.. on hard surface... for using the rolling cherry picker, etc... or facing each other if you have good wheels on cherry picker...but a 617 is VERY HEAVY....

charmalu · #7 08-29-2014, 12:37 PM

Ditto what Dan said. Does not sound good.

You mentioned in the video about moving the 617 engine back because it is longer. You won`t have to, it will sit in the exact place as the 616, you will gain one more cylinder which will take up the space between the VC and firewall you now have with the OM616.

You will need a Cross Member for the Manual trans to sit on out of a 240D automatic, because the trans will be moved back.

It is not all that bad of a swap to do, only difficult if you have not done one.
It is always harder to do thinking about it,, and afterwards when it is done, was a piece of cake.

Charlie

w123fanman · #8 08-29-2014, 01:19 PM

That is my friend in the video, I have faith in him figuring it out though I will have to source a 240D auto cross member or make one (I am at GT after all). He has done an engine swap before but it was a engine replacement, but in a Toyota Sienna (helped him a little, what a pain, no room in the engine bay).

There are a few benefits to the OM616 being out, it needed new engine mounts and a few gaskets replaced plus the engine bay needs to be cleaned and/or painted.

Dan Stokes · #9 08-29-2014, 02:34 PM

I hope you'll do a little exploratory surgery on the 616. It'll be interesting to see what's kaput in there.

Dan

leathermang · #10 08-29-2014, 03:16 PM

How about being more specific about what is being swapped..

is the 240 a standard shift ?

Is the 617 a turbo ?

Are you only changing out the engines.... not keeping the trans with the 617 ?

w123fanman · #11 08-29-2014, 03:17 PM

Quote:

Originally Posted by Dan Stokes

I hope you'll do a little exploratory surgery on the 616. It'll be interesting to see what's kaput in there.

Dan

Just talked to my friend and that is what he has been planning, he will disassemble it in his barn, wanted it inside to work on it out of the elements, so really he didn't jump the gun, he just didn't explain his intentions to me well.
We may decide to fix the issue and put the engine back in but that depends on what he finds.

My dad has been interested in putting a OM617 turbo in there for a while now because he would like a bit more power combined with the manual transmission, this restoration is meant to be a surprise for him. We are currently looking for a donor car, if anyone has any leads on one, that would be nice.

w123fanman · #12 08-29-2014, 03:19 PM

Quote:

Originally Posted by leathermang

How about being more specific about what is being swapped..

is the 240 a standard shift ?

Is the 617 a turbo ?

Are you only changing out the engines.... not keeping the trans with the 617 ?

Hoping to mate a 617 turbo to the manual transmission from the 240D.