Overheating-cracked block? - PeachParts Mercedes-Benz Forum

alminiowa · #1 03-17-2013, 04:18 PM

I was hoping I could get a second opinion. My 1983 300D overheated. A coworker who is good with cars said he suspected it had a cracked block, so I stopped driving it. The car has been sitting for over a year without being started--until today.

There's a good chance I may be moving, and I've been reluctantly thinking about selling the car. Today, I put a battery in it and it started up immediately.

I noticed there was no antifreeze in the reservoir so I added it while the car was shut off. I noticed that the reservoir was not filling, so I started looking around for a leak. Turns out there was a steady, small stream coming from underneath the car toward the front middle. I got under the car and looked and followed the leak upward. Pictures are attached.

I'm wondering if this is what a cracked block looks like?? Do I need to accept the car's untimely death and move on?

whunter · #2 03-17-2013, 04:45 PM

That is a bad cylinder head gasket.

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alminiowa · #3 03-17-2013, 04:52 PM

Thanks. Can you tell me roughly how much it would cost to repair/replace?

whunter · #4 03-17-2013, 05:04 PM

Quote:

Originally Posted by alminiowa

Thanks. Can you tell me roughly how much it would cost to repair/replace?

If the head is OK, and you DIY
1983 Mercedes-Benz 300D Sedan - Cylinder Head & Valvetrain - Page 1
+ oil change and antifreeze.

If you take it to a shop $500.00 - $3,000.00 USD.

If the head is cracked ???

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alminiowa · #5 03-17-2013, 05:16 PM

At different websites, I'm seeing about 10 hours labor time to replace a head gasket. Does that sound reasonable? I know a very reputable independent Mercedes mechanic who charges $60/hour. Thanks again.

t walgamuth · #6 03-17-2013, 07:19 PM

sounds about right. I'd prolly check the valves while its off though and do a grind and replace any weak springs and or worn valves.

I don't want to question Roy much but I thought it looked like a leaky freeze plug. It also looks like a rubber squeeze it freeze plug replacement.

dude99 · #7 03-17-2013, 08:04 PM

also, does it not look like theres a crack directly underneath the glow plug? Or is it just the photo??

Diesel911 · #8 03-17-2013, 08:13 PM

When the Head is removed besides have it checked to see if it is still Flat they should do a pressure test to see if it leaks anywhere.

There is a few ways to fix external leaks but if you need to pay someone to do that it is not worth the trouble. Also someone doing that type of repair needs to be more skilled than the average Mechanic.

Also, when an Engine overheats it is more common for the Head to warp and maybe crack or for the Head gasket to go.
Once in a while Blocks crack but if it is due to overheating the often Pistons Skirts will also be all chewed up and the Cylinder walls will not look so good.

It is more common for a Block to leak due to some casting flaw or porosity.

The Block can also be Pressure tested if they have a Plate or Plates made for that.

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Diesel911 · #9 03-17-2013, 08:24 PM

Quote:

Originally Posted by dude99

also, does it not look like theres a crack directly underneath the glow plug? Or is it just the photo??

I enlarged part of the pic.

alminiowa · #10 03-17-2013, 08:26 PM

Quote:

Originally Posted by t walgamuth

I don't want to question Roy much but I thought it looked like a leaky freeze plug. It also looks like a rubber squeeze it freeze plug replacement.

Yes, it is a rubber freeze plug replacement. That was put there after the car overheated and we looked and saw that a freeze plug was missing.

I don't know anything about cars, so please forgive me if I accidentally omit something important. I like visiting these forums because I learn quite a lot!

Diesel911 · #11 03-17-2013, 08:34 PM

I was looking at the first Pic and I was thinking what if there was a Freeze/Core Plug Leaking?
Before you tell your Mechanic to remove the Head I would let Him pressurize the Coolant System and see if He can find exactly what is leaking.

whunter · #12 03-17-2013, 08:37 PM

Quote:

Originally Posted by dude99

also, does it not look like theres a crack directly underneath the glow plug? Or is it just the photo??

It would be extremely unusual to have a crack there on the OM617.

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whunter · #13 03-17-2013, 08:41 PM

Quote:

Originally Posted by alminiowa

Yes, it is a rubber freeze plug replacement. That was put there after the car overheated and we looked and saw that a freeze plug was missing.

I don't know anything about cars, so please forgive me if I accidentally omit something important. I like visiting these forums because I learn quite a lot!

More data needed.

What state are you in ?

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alminiowa · #14 03-17-2013, 08:45 PM

Western North Carolina.

whunter · #15 03-17-2013, 09:08 PM

Quote:

Originally Posted by alminiowa

Western North Carolina.

Western North Carolina = snow and below freezing temperature.

They are called freeze plugs because; If the coolant freezes solid (theoretically) they break, instead of the cylinder head or engine block.

Now I need to change diagnosis.
The engine is dead, head broken, and serious risk of a cracked block.

I would contact "vstech", he may have a good spare engine and is near Charlotte, NC.

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