Garaged C240 What's PM are due at 87k Miles? - Page 5 - Mercedes-Benz Forum
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post #41 of 63 (permalink) Old 03-06-2018, 11:55 AM
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Originally Posted by tjts1 View Post
I picked up a used valve cover and breather for $35 shipped on fleabay.
That's a good price with shipping.

Out of curiosity, I checked Pick and Pulls price online. $18.99 + $3.99 core + $2.00 entrance fee + recycling fee (WTH is this?)+ tax + your time & labor. Should be a lot available in the boneyard if someone needs one.

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post #42 of 63 (permalink) Old 03-06-2018, 02:45 PM
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Jay,
The red gasket is only for M272 3.5l DOHC engines.
The rectangular gaskets are for the oil pressure test port.
For the oil cooler you need the other ones.
You will also need a 46 mm socket

Last edited by Benzyle; 03-06-2018 at 02:47 PM.
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post #43 of 63 (permalink) Old 03-08-2018, 10:32 AM Thread Starter
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Originally Posted by Benzyle View Post
Jay,
The red gasket is only for M272 3.5l DOHC engines.
The rectangular gaskets are for the oil pressure test port.
For the oil cooler you need the other ones.
You will also need a 46 mm socket
Thanx, I was checking out that area and a week after engine wash I don't see any leaks. Was it old leak gunk, not sure. I will drive it for another week or two and see what I will.

I have another issue - I pulled plug #-1 it has a thin film of oil on the threads, ground and center electrodes are dry. A bore cam is on the way. I previously repaired the top cover gaskets about 3 weeks ago (was a p0303) and tightened them just enough but snugly, I thought. Around plug three there's a slight oil leak, I think I just need to torque to spec.
1-What is the spec?
2-Just trying to understand - how can there be no oil leak around plug 1 top cover gasket but the plug has a thin film of oil?

The other 02 C240 72k miles has the same oil film on all plugs. It idles just a bit ... not smooth like a kitten. It's a very subtle idle roughness that wife and most wouldn't notice, but I did. I suspect the oil in the plugs. Pulled bank 1 plugs and all are nasty-the electrodes are clean tho'. While I am gonna replace them, harken again to same question as above as to the source for the oil leaks? Both cars have no active nor pending codes.
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post #44 of 63 (permalink) Old 03-08-2018, 02:54 PM
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Torque for the valve cover bolts is 8 Nm. Breather cover is 3 Nm.
If you are certain that the plug well is dry and the thread does not have oil from past leaks, but the thread of the plug has oil,,it is actually the by product of incomplete combustion in the chamber,not necessarily oil, but an oily residue from the fuel.

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post #45 of 63 (permalink) Old 03-08-2018, 06:56 PM
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I previously repaired the top cover gaskets about 3 weeks ago (was a p0303) and tightened them just enough but snugly, I thought. Around plug three there's a slight oil leak
What gaskets did you use? The aftermarkets (almost all made by Victor Reinz) will leak as they are not thick enough. Use genuine MBZ valve cover gaskets.

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post #46 of 63 (permalink) Old 03-08-2018, 09:23 PM Thread Starter
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@Benzyle

I hope you are. I think you are right, due to electrodes being clean. Drive some more, and re-check.
@rudeney
I used those victor reinz. Well I will torque them, wipe dry and see what in a week's time. In any case I don't expect much life out of these reinz [email protected]#$%.

But what do you guys make of the subtle, slight rough idle? I wish I could have access to a C240 and just sit silently as it idles, some where in Dallas.
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post #47 of 63 (permalink) Old 03-09-2018, 12:34 AM
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Don't be tempted to torque any more than 8 Nm. You will achieve nothing because the cover sits metal to metal in the corners, but you could strip a thread.
See post number 11.

Last edited by Benzyle; 03-09-2018 at 12:41 AM.
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post #48 of 63 (permalink) Old 03-09-2018, 03:27 AM Thread Starter
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Noted. Stripping....that is what I was afraid of. But I will approach this as a male hedgehog approaching a female ... very very carefully.
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post #49 of 63 (permalink) Old 03-09-2018, 03:51 AM
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Noted. Stripping....that is what I was afraid of. But I will approach this as a male hedgehog approaching a female ... very very carefully.
I like it......but,seriously, the best way is to use a torque wrench designed for low torque ranges,,,I got one on ebay which is for bicycles,,,but works well for cars too.
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post #50 of 63 (permalink) Old 03-09-2018, 04:27 AM Thread Starter
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Interesting you mention bike torque - I was just looking at the HFT 1/4" Torque. I have the 1/2" but it's way too big at some tasks.
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