Oil leak on 2010 C300, not the usual suspects - Mercedes-Benz Forum
 
LinkBack Thread Tools Display Modes
post #1 of 3 Old 12-30-2018, 11:35 AM Thread Starter
Junior Member
 
Join Date: Dec 2018
Vehicle: 2010 C300 4Matic
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Oil leak on 2010 C300, not the usual suspects

hello,

i just bought my wife this 2010 C300, and it runs great... but the previous owner decided to remedy the oil leak concealing its presence, so it's my problem now.

we are experiencing the tell-tale oil dripping onto the exhaust, on the RH (passenger) side of the engine. i pulled the engine cover, and it's definitely on the side, not the rear. the cam plugs and breather cap are holding tight for now... at first i suspected the valve cover gasket, but after clearing everything off, it looks like the oil is coming out of the bolts that secure the valve cover. is that a thing? the oil seems concentrated at the bolts directly beneath the wiring harness just a few inches south of the oil fill cap. the oil is seeping down the valve cover onto the exhaust, but also over the other side toward the intake manifold. my assumption is that the valve cover gasket (if it was leaking) wouldn't defy gravity by traveling up and coming down the other side... i've attached some photos.

i welcome your thoughts!
Attached Thumbnails
Click image for larger version

Name:	IMG_6625.jpg
Views:	32
Size:	24.2 KB
ID:	9255   Click image for larger version

Name:	IMG_6624.jpg
Views:	29
Size:	23.7 KB
ID:	9257  
reverendalc is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 12-30-2018, 12:18 PM Thread Starter
Junior Member
 
Join Date: Dec 2018
Vehicle: 2010 C300 4Matic
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
well, i suppose i answered my own question... yes this is a thing. after cleaning everything up and running the car for 15min, attached is a photo of the result. i'm assuming that the valve cover gasket is what seals the mating points between valve cover and cylinder head?

also, does this engine use grommets on the valve cover bolts, or is there an option to place a grommet as opposed to yanking the valve cover? i'm mechanically inclined to do the job, but i'm not very well equipped, my garage is full with other projects, my driveway is at quite a slope, and well.. it's just plain cold outside.
Attached Thumbnails
Click image for larger version

Name:	IMG_6627.jpg
Views:	29
Size:	73.1 KB
ID:	9259  

Last edited by reverendalc; 12-30-2018 at 12:25 PM.
reverendalc is offline  
post #3 of 3 Old 12-30-2018, 02:02 PM Thread Starter
Junior Member
 
Join Date: Dec 2018
Vehicle: 2010 C300 4Matic
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
well, as it turns out, the aforementioned bolt was barely more than hand tight. after torquing to 10nm and double-checking the others, it's ran for 30min without so much as a drip.

what a stupid problem. the wife is driving to the grocery store now, and it doesn't smell like toxic burnt ass anymore
reverendalc is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Enthusiasts Forums > DIY/Tech Help


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
'14 c300 4matic oil pan Thomas Saab DIY/Tech Help 4 01-25-2018 09:34 AM
Higher than usual RPM's??? dav3 Mercedes-Benz Sedans/Wagons 0 06-14-2004 12:42 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome