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Spark plugs and rocker box gasket oil leak

Dizz

Dizz

Active Member
Joined
Jun 4, 2017
Messages
278
Car
CLK320 (w209)
<div class="bbWrapper">2005 3.2 CLK<br /> Car is idling a bit lumpy this morning although seems to drive okay I’m wondering if oil is getting onto a spark plug as I have an oil leak from the Rocker box<br /> Do I need to remove the spark plugs to change this gasket.<br /> Is this a DIY job I know the spark plugs can seize up and be a problem.<br /> Thanks. <br /> <br /> <br /> Sent from my iPad using Tapatalk</div>
 
<div class="bbWrapper">Rocker cover gasket leaks on 99% of those M112s and almost never causes an issue tbh</div>
 
<div class="bbWrapper">Hi mate<br /> Left hand side coil packs look wet’ish with oil and one spark plug lead too.<br /> I’m sure this is causing the lumpy idle. <br /> <br /> <br /> Sent from my iPad using Tapatalk</div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 131827" data-quote="Dizz" data-source="post: 2862118" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=2862118" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-2862118">Dizz said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Hi mate<br /> Left hand side coil packs look wet’ish with oil and one spark plug lead too.<br /> I’m sure this is causing the lumpy idle.<br /> <br /> <br /> Sent from my iPad using Tapatalk </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote><br /> Ah okay mate - here’s a guide (shows a m113k) but similar process<br /> <a href="http://fotifixes.com/2015/02/13/how-to-change-rocker-cover-gaskets-and-reseal-breather-covers-on-the-m113-engine/" target="_blank" class="link link--external" rel="nofollow ugc noopener">How to – Change Rocker Cover gaskets and reseal breather covers on the M113/M112 engine | FotiFixes.com – A Journal of my fixes</a></div>
 
<div class="bbWrapper">Thanks for the link.<br /> Blimey that seem like a lot of work!<br /> Too cold and wet for me to do on the driveway.<br /> Going to have to ring the garage I think.<br /> <br /> <br /> Sent from my iPad using Tapatalk</div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 131827" data-quote="Dizz" data-source="post: 2862089" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=2862089" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-2862089">Dizz said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> 2005 3.2 CLK<br /> Car is idling a bit lumpy this morning although seems to drive okay I’m wondering if oil is getting onto a spark plug as I have an oil leak from the Rocker box<br /> Do I need to remove the spark plugs to change this gasket.<br /> Is this a DIY job I know the spark plugs can seize up and be a problem.<br /> Thanks.<br /> <br /> <br /> Sent from my iPad using Tapatalk </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>it's not the rocker covers it will the crankcase breather covers gaskit they are rtv sealant common problem on m112 i did mine both sides big job</div>
 
<div class="bbWrapper">Not a hard job, <br /> You can replace the breather valve and hoses while your there.<br /> Preferably use genuine rocker cover gaskets.... I used febi ones before and it leaked no matter what... Genuine one was good</div>
 
<div class="bbWrapper">Hey Dizz<br /> <br /> I assume you have had the car scanned by a diag machine and nothing is showing up?<br /> <br /> Rough idling can be caused by a number of issues including a vacuum leak, throttle body etc etc.<br /> <br /> As clk330x mentioned, rocker cover leaks are quite common and do not necessarily cause any issues.</div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 150705" data-quote="55AMGCLK" data-source="post: 2862335" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=2862335" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-2862335">55AMGCLK said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Hey Dizz<br /> <br /> I assume you have had the car scanned by a diag machine and nothing is showing up?<br /> <br /> Rough idling can be caused by a number of issues including a vacuum leak, throttle body etc etc.<br /> <br /> As clk330x mentioned, rocker cover leaks are quite common and do not necessarily cause any issues. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote><br /> Not had a scan yet as this only started happening yesterday, will get it booked into someone ASAP<br /> <br /> <br /> Sent from my iPad using Tapatalk</div>
 
<div class="bbWrapper">Dizz, I looked into doing mine some time back, despite being pretty 'handy' with a spanner or two I decided to pay my indi to do it, at least that way if it leaked it would be his problem <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f61b.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":p" title="Stick Out Tongue :p" data-smilie="7"data-shortname=":p" />. I can't say exactly what he charged because I had the plugs changed and other stuff done at the same time.<br /> <br /> Not a nice job to do outdoors either, especially in this weather.</div>
 
<div class="bbWrapper">Cars running fine again now but I’ve booked it in to an Independent Mercedes garage (Tm Motors) to investigate what’s going on.<br /> <br /> <br /> Sent from my iPad using Tapatalk</div>
 
<div class="bbWrapper">Update it’s fixed! £460<br /> They were actually two issues going on here both unrelated.<br /> <br /> 1. Oil leaks<br /> Oil filter housing/ cooler seal<br /> Both crank case-covers and associated breather pipes.<br /> 2. Rough idle<br /> Broken bracket holding pipe from air mass sensor causing a gap and allowing unmetered air in.<br /> <br /> No STAR codes other than relating to the misfire/idle<br /> <br /> Fit bracket and reconnect hose....instant perfect idle etc<br /> New breather pipes, reseal crankcase covers, clean up excess oil and all is good again.<br /> Interestingly the mechanic mentioned that the crankcase covers had been resealed before, but in his opinion it was quite poorly done.<br /> <br /> So thanks to you all for your replies, some of you were spot-on with your diagnosis and advice and also thanks to ‘TM motors’ ( independent Mercedes garage) in Molesey Surrey, first time I’ve used this company and would recommend them to anyone who needs some work done on their Mercedes</div>
 
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<div class="bbWrapper">Result <img src="/styles/mbclub/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /> . Money well spent.....better if they never leaked, but it is what it is.</div>
 
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