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Premium Member
1999 S600 & 1999 S500
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Discussion Starter #1
I have oil around # 2 and #4 on my M120. Car surges on take-off, when cold. I am thinking it is because of the sparkplug rings, which are replaced when yo do the spark plugs.
Has anyone had the VC gaskets replaced? If so, how much?
I saw something on here referencing 10-15 hours for DYI.

Also, if I do this, are there anu other things I should do since I will have the intake manifold and valve covers off?
 

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600 coupe, one of the very first built
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140 Posts
I saw something on here referencing 10-15 hours for DYI.
Probably true. Valve covers on the V12 require the intakes to come of.
Lots of work to get to them.

Many good pictures and posts in the archives.
 

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1999 S600 & 1999 S500
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850 Posts
Discussion Starter #3
I do not have the time so I plan to have my dealer do this. They are working on an estimate. I am thinking about $2K for the project. I do get a 10% discount for MBCA membership.
 

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1994 S600 Coupe, 1995 S600 Coupe
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1,884 Posts
Have them replace the cooling tee at the firewall and all of the short cooling/heater hoses at the back of the intake manifold. Almost impossible to get to that stuff with the manifold on.

I'll be curious to know what they quote for this job. It's a LOT of work.


Jon
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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7,599 Posts
The other extras you should also change are the Back water hoses down the bottom of the V ,check the pipe in the middle of the V for cracks .
 

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1999 S600 & 1999 S500
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850 Posts
Discussion Starter #6
jal1224
Dealer wanted close to $5,000. It seems like they do not want to do major work on a 20 year old car. I went to a local import indy, who says they have done 4 or 5 of these. His price is $1,575.
I will not get a free loaner but 2-5 days rental will be much cheaper than $5K. Job is scheduled for week after next. I will let you know how it turns out. They will also replace the oil sending unit for I think about $100 to $150. I can do it , but easier to let the shop do it.

Merc600
Thanks, I would not have thought about that. I think I have a Tee that I purchased a while back from LWB250. I will dig it out and revisit it with the shop.
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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If you need the Part# 's for those hoses let me know ,those hoses below in my video above have nothing to do with the Infamous T joint found on RHD W140's ,we don't have them on early M120's (not sure about later M120) , we have a Metal Y there instead.
Wow ,$5000 to remove the manifold & 2 rocket covers , the rest is easy replacing the seals . If i were you i park the car in the garage & start unscrewing , it's easier done then you think . Of course if your body feels like it .
When i did mine recently removing the manifold etc ,i wasn't sure if i will succeed re-installing everything properly as it was my 1st time removing it . I purchased a lot of new parts while waiting for parts , ended up with a beautiful Torque wrench & i believe that i did a better job then what MB could have done as the engine runs absolutely flawless & every single wire received additional protection like it is visible on the Wire next to the MAF in pic below ( i dont think MB will spend time doing that lol) .
Every Nut / bolt & even the spark plugs ,i tightened to factory torque specification, every single fragile plastic connector was also replaced including the addition of the 12 spark plug lead clip holders (i have the part #) which were completely broken of if you need .
That $1500 job is not to bad but still ,doing it yourself you end up replacing additional parts,cleaning here & there ,probably 2 new EGR valves or repair existing once , end up with a few more tools & above all , a lot of experience with your cars engine ,well worst it if you ask me .
Mention to clean the Throttle Actuators to your mechanic if you decide to go that way ,they are most likely covered in carbon deposits which affects mostly idle/flow (check wiring etc) same with EGR valves if they are still on the Engine.
Here she is,everything around the engine & behind & below is new including radiator etc ,all done myself ,no mechanic gets near it ,maybe just to take a sneak peek to show what a Real engine looks like,lol.


20200115_103959.jpg
2617359
 

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Premium Member
1999 S600 & 1999 S500
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850 Posts
Discussion Starter #8
If you need the Part# 's for those hoses let me know ,those hoses below in my video above have nothing to do with the Infamous T joint found on RHD W140's ,we don't have them on early M120's (not sure about later M120) , we have a Metal Y there instead.
Merc,
Can you send me the part #s for those two hoses?
 

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CLK 430, E500 4 Matic Wagon
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jal1224
Dealer wanted close to $5,000. It seems like they do not want to do major work on a 20 year old car. I went to a local import indy, who says they have done 4 or 5 of these. His price is $1,575.
I will not get a free loaner but 2-5 days rental will be much cheaper than $5K. Job is scheduled for week after next. I will let you know how it turns out. They will also replace the oil sending unit for I think about $100 to $150. I can do it , but easier to let the shop do it.

Merc600
Thanks, I would not have thought about that. I think I have a Tee that I purchased a while back from LWB250. I will dig it out and revisit it with the shop.
5k to 1.7k....Make it and, save that loot!
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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Merc,
Can you send me the part #s for those two hoses?
Here you go . The 124 # is for that small hose ,fits pefectly once you cut it to size & you can get that easily anywhere .
The other is the S shaped one next to it . Cost around $15 -20 at dealer only , others sell it for above $115 .
Dont forget to get good MB original Clamps for these or use yours if they still good , dont use china junk clamps in that location .
Were i'm pointing at is were the small 124 # hose goes that you cut like you see on the pic with the 2 clamps on . Remember how the clamps are fitted onto the engine ,they need to be refitted the same way ,if installed wrong ,the head will interfere with the Manifold then so you cant reinstall it .
Best to take a picture not to forget before removing.


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2617774
2617776
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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Looking at the Clamps how they are turned the other way just to make life miserable seams hard to remove ,but really are not if you use a Flexible tool .
Forgot to ad that above .
 

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1999 S600 & 1999 S500
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Discussion Starter #12
THANKS! I will pass this on to the garage who will be doing the work.
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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THANKS! I will pass this on to the garage who will be doing the work.
Tell them also to take a close look at the shape of the Hose on your car as this (mine) is RHD,just look at my engine then yours , maybe (i'm not sure) it could swing the other way around it ,i doubt it but just to mention it , the lower center one is the same .
 

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Premium Member
1999 S600 & 1999 S500
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850 Posts
Discussion Starter #14
Merc 600
It looks like the 124# is a similar hose from which you cut a length to fit. Is this correct?
124# is the one you are pointing at?
Is the 140# an exact fit?
Do you know if these hoses are different on a RHD than an LHD?
Is the tee in here somewhere?

I could also not find the 140 hose online. The 124 I will buy and give to the shop. He said his usual supplier does not have it.

I meant to send this yesterday.
 

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"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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Merc 600
It looks like the 124# is a similar hose from which you cut a length to fit. Is this correct?
124# is the one you are pointing at?
Is the 140# an exact fit?
Do you know if these hoses are different on a RHD than an LHD?
Is the tee in here somewhere?

I could also not find the 140 hose online. The 124 I will buy and give to the shop. He said his usual supplier does not have it.

I meant to send this yesterday.
There is no Part # for the 124 small hose on the m120,the 124 # is long enough were you just cut out the small piece ,the curved section .
Look at the Picture ,underneath top ,is my original split hose then the 124 # then the cut out you need with the Clamps on it .
I'm sure the 140 hose # for that section should be the same as LHD or RHD ,the T is on the upper side & has nothing to do with these 2 hoses .
If you can & it's not to late ,send me a picture of the open engine on yours ,i will be able to tell you from that if the S shaped is good or not .
I don't think you will find that 140# online ,i had trouble as well finding it ,Dealers have it in there system ,arrives quickly from Germany ,Cheap original hose .
Booth hose fit 100% .
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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If you order parts at the dealer and of course you need the Tiny little Clips that hold in place the Spark Plug leads on top of the Rocket covers , that part # is .
2617990
20190802_105501.jpg
2617991
 

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of course you need the Tiny little Clips that hold in place the Spark Plug leads on top of the Rocket covers
This applies only to cars with the LH systems (distributors).
The MY 1996-99 V12s have coil-on-plug and do not require these clips.

As far as the hoses in the rear -- the configuration will be market-dependent.
Cars sold in AUS don't have the heater "TT" and probably use different coolant hose.

The OP should consult with EPC based on their VIN and order the correct parts.
There are two o-rings in the back of the heads that should also be replaces while "in there"
 

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97 S600 Coupe. Former 83 300D, 97 C230, 93 400E, 92 500SL, a few others
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My indie just did mine last week! 187k miles, stunk and was dripping oil for a couple years.

I got out with right at $2000 at the indie who charges $100/hr and was liberal with the time estimate. Every vac line, manifold gasket, intake gasket......all this replaced including the EGR tube that disintegrated on contact. I swear it feels more responsive at part throttle now, maybe due to new vac lines
 

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1999 S600 & 1999 S500
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Discussion Starter #19
Thanks for all of the input. I did give my vin to the garage to search for parts.
 

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"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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This applies only to cars with the LH systems (distributors).
The MY 1996-99 V12s have coil-on-plug and do not require these clips.
Yes ,absolutely . Later M120 with the 12 Coils don't have those Clips , completely forgot about those . Thanks for the correction.
I leave the Part # for those up there ,maybe some other early M120 owners needs it in the future .
 
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