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Discussion Starter #22 (Edited)
Can we get back to the original premise of this post, which is an M104 head gasket replacement?


Have you started the HG job yet?
Wow, my thread has taken a bad turn already! lol
I haven't started it yet. Funds for a 3rd vehicle that we don't really have a use for are short right now. I do hope to get it back together this summer. In the meantime, I get to work on my daughter's rusty 200K mile Honda CR-V :banghead:
 

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Make sure you get a new set of head bolts besides the obligatory factory headgasket kit. Ditto on MB sealant a.k.a. Hylomar for the timing cover seal.

Not something you want to skimp on.

In the interim, have you used a endoscope to find out if all that water is indeed orginating from the head gasket. I've never seen that much before.

And this link might prove very helpful to you.

PeachPartsWiki: Head Gasket Replacement
 

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It's funny they built in similar reinforcements to the redesigned om603 head gasket too. The right rear most head bolt on that engine ends up very rusty on every engine I've seen.
 

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It's funny they built in similar reinforcements to the redesigned om603 head gasket too. The right rear most head bolt on that engine ends up very rusty on every engine I've seen.
From this ^ it looks like the diesels leak coolant at that point while the gas motors leak oil. One small leap for Mercedes: one even smaller leap for MB owners... :(
 

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It's funny they built in similar reinforcements to the redesigned om603 head gasket too. The right rear most head bolt on that engine ends up very rusty on every engine I've seen.
From this ^ it looks like the diesels leak coolant at that point while the gas motors leak oil. One small leap for Mercedes: one even smaller leap for MB owners... <img src="http://www.benzworld.org/forums/images/smilies/frown.gif" border="0" alt="" title="Frown" class="inlineimg" />
All of MB's inline 6 engines from the 80s and 90s suffer from problems like this. I think it's because it's considered "normal" for these engines to go over 100c. Keep it under 100c at all times and the head gasket will last a lot longer. The later V6 and V8 engines with more effective cooling fans never go over 100c in normal operation and consequently don't blow head gaskets on a routine basis.
 

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Discussion Starter #31
Quick update! I have finally spent a little more time doing some tear down on my old Benz this week. Tonight I will put it up on the Quickjacks so that I can unbolt the exhaust from the manifolds and finish unbolting the manifolds from the block. From there, I need to pull the intake and I should be ready to pull the head. After sitting all this time, the coolant has still not drained out of piston #6. That's crazy!
 

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Discussion Starter #32
I got a bunch done last night. I am amazed at how well everything is coming apart on a car that has sat for almost two years.
I sucked out all of the coolant that was in cylinder #6 and when I pulled the intake manifold, the valve chambers for #6 were also filled with coolant. Additionally, the cast pipe that the throttle actuator mounts to has a pool of coolant in the bottom of it as well. The injector for #6 looks normal, not that that means it was still working. The whole thing is really bizarre.
I got all of the head bolts loosened up last night, which was very easy. All that is left is to make the little tool to pull the timing chain guide pin on the driver's side so I can pull the upper cover. Then, I'll get everything lined up and remove the cam sprockets and chain.
Anyone have a weight estimate of the head without intake but with exhaust manifolds left on it?
 

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I don't know how much they weigh. A lot of members in here complain about the weight. Leave the exhaust header on and use as a 'handle'. If you've ever removed CI heads, this one feels like a feather. YMMV.....

Kevin
 

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Discussion Starter #36
Well, I can tell you now that the head on these cars is HEAVY! I lifted it off by myself tonight. Overall, it is really not a bad job getting it torn down and I feel like I got lucky because everything came apart very easily. I will inspect the block better in the light tomorrow since it was dark out by the time I pulled the head tonight but, so far, everything looks perfectly fine! The piston for #6 looks brand new after having sat with coolant on its face for two years. All the pistons look pretty clean. The backside of the valves all look brand new. Keep in mind, this motor only has 130k on it, 55k of which, I put on. I’ve started gathering a parts list online as it looks like a head gasket will get this car on the road again! It’s too bad the clearcoat went on this car.
General mayhem photos:









Sent from my iPhone using Tapatalk
 

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Probably already pointed out but you can see where the water breached on your last picture on #6 and #5 was nearly breached as well.

After you take off the head, I would recommend stuffing all the ports and block sanding the head lightly. I did this with mine as recommended by the machine shop who did the head.

Tedious work plugging all the ports with rags, q-tips, etc. and not dropping anything into the block. Glad I did it though. No leaks after year.
 

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Discussion Starter #39
@dolucasi Thanks for the suggestion!

Do you guys know of any product that help clean corrosion off of aluminum parts like my intake manifold, alternator, power steering pump and other brackets, etc.? Also, while I will definitely be going with the MB head gasket kit, what about the valve cover kit? I've seen Elring and Victor Reinz as much cheaper alternatives to MB for the valve cover kit.
 

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Any part that is not electrical should be tossed in the steam oven with the head at the machine shop. It will come out clean (like your piston) and will look like brand new out of factory. Wish I had done that myself as I had to clean the intake manifold with diesel, ours on end. Busted my back in the process as it was not out of the car. The head/valves etc. that the machine shop pre-cleaned were spotless.

As for the gaskets, good you decided with genuine Mercedes on the head kit, it is a job you want to repeat.

I have a cheepo Victor Reinz in hand and have never used it. Keeping it for some sort of emergency. Mercedes one that I have re-used 4 times I opened the valve cover is very substantial. I would not trust the Victor Reinz (flimsy) but then again changing the valve cover is a 15 minute job so you can afford to take risks. I would not want oil leaking on the brand new looking head though.

- Cheers
 
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