Re: [diesel_mercedes] Rebuilding a 91 350SDL

 

Did it burn LOTS of oil before it blew?  The 3.5L engines are known in some circles as "Rod Benders".  Once the rod or rods bend, the irregular motion ovals the cylinder-s-   causing oil consumption.  A member of another list tore his rod bender down to find the head gasket had failed on #1 cylinder which hydrolocked it and caused that rod to bend.  He put a new rod on that cylinder, replaced the head gasket and has had no problems with it.
 
Good luck with your 'SDL!
 
Kevin in LaPorte, CO, no Diesel Mercedes at this time

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Re: [diesel_mercedes] Rebuilding a 91 350SDL

 

Rusty,


MaBenz will rebuild and fix these for free, if it has not already been upgraded.  (Note: this is rumor, not something I have done.)

You and the re-builder need to carefully check several items, to find out what went wrong, and correct it.

1. Empty the oil and check if it seems OK or if it has been "polluted".

1. A. Is the level about what you expect or is it over full?

1. B. Is the oil diluted by the B95?

1. C. Is the oil jelled?

If A and B, then check the rings for letting the fuel gets passed and the injectors for being clogged.  If either, heat the fuel more before it gets to the injection pump.

If A and C, then your transesterfication is not converting all the oil to bio-diesel.  Veggie oil is not compatible with engine oil.

2. Are the rod and main bearings bad?  If so, check the oil and see A-B or A-C.

3. Are the injectors slightly clogged or grossly clogged?

If slightly, get new injector nozzles and rebuild injectors.

If grossly, get new nozzles, rebuild injectors, and add more heat before the IP.

Good luck,

Bobby

On Wed, Mar 6, 2013 at 10:31 PM, rmh3_98 <rmh3_98@yahoo.com> wrote:
 

I'm am having my 91 SDL rebuilt after it died a while back. Not sure what killed it yet as we will learn more after we crack open the engine. I have run bio diesel in her for about the last 100m miles. I am pretty sure that this had an impact on her demise. I am also prepared to find the infamous "crank arm" issue. We are planning to upgrade to heavier crank arms to start.

My question is "What would you modify, replace or upgrade during the process?"

I plan to continue to use bio diesel. May blend it down a bit below B-95 though.

Suggestions or directions to other sources is greatly appreciated.

Thanks,
Rusty




--
Toward freedom,

Bobby Yates Emory

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[diesel_mercedes] Rebuilding a 91 350SDL

 

I'm am having my 91 SDL rebuilt after it died a while back. Not sure what killed it yet as we will learn more after we crack open the engine. I have run bio diesel in her for about the last 100m miles. I am pretty sure that this had an impact on her demise. I am also prepared to find the infamous "crank arm" issue. We are planning to upgrade to heavier crank arms to start.

My question is "What would you modify, replace or upgrade during the process?"

I plan to continue to use bio diesel. May blend it down a bit below B-95 though.

Suggestions or directions to other sources is greatly appreciated.

Thanks,
Rusty

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[diesel_mercedes] Now one problem. Clogged Tank Screen. 300 Touring Diesel

 

I used my new tool to take out the tank filter. A little soap and hot water was
all that was needed (along with a high pressure stream thanks to my finger on
the faucet) to clean the filter. It's back in and so far no bubbles after using
the primer pump. The bubbles and suspected tank sender problems were all from
the clogged tank screen. So two problems were really one clogged tank.
Lawrence Rhodes

>
> It's a M14. Short bolt and two nuts. Crank the nuts together and it fits
> perfectly in the hex Allen under the tank.. Will clean tank later today.
>Tank
>
> sender good. But screen clogged causing air to be sucked into the system.
>Took
>
> off hose and a couple of drips came out. Lawrence Rhodes.

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