104 engine noise after changing rocker cover seal

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benzy53
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104 engine noise after changing rocker cover seal

Post by benzy53 » Fri 24 Feb, 2017 7:38 am

I recently bought a W124 E280 and started changing the oils and other bits as you never know what has been done.
A seller will tell you always the good parts. So I decided the change the rocker cover seal and new spark plugs as
it had a tiny leak. After putting everything together thee is a strange knocking noise coming from the engine.
It sounds like coming from the first cylinder and from the cam shaft. I'm pretty confident that I didn't leave
any tools inside. I didn't touch anything inside just replaced the seal and spark plugs. Any ideas would be
greatly appreciated
benzy 53.

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Tony From West Oz
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Re: 104 engine noise after changing rocker cover seal

Post by Tony From West Oz » Fri 24 Feb, 2017 1:26 pm

Id the knocking noise related to the speed of the engine (frequency of knocking increases with engine RPM)?
The rocker cover seal should be pliable enough to re-use, so it is more a case of finding out what is making the noise.
I think it should be a urgent priority for you to check under the rocker cover.
I am happy for others with experience on this engine to contradict my comments as I do not know your engine.
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
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Bartman4800
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Re: 104 engine noise after changing rocker cover seal

Post by Bartman4800 » Fri 24 Feb, 2017 1:29 pm

Hard to tell, could be coincidental in a way it has nothing to do with the work you did.

Could you post a soundbite on youtube with a link here so we can have a listen?

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benzy53
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Re: 104 engine noise after changing rocker cover seal

Post by benzy53 » Fri 24 Feb, 2017 3:44 pm

Thanks for your input. I think I found the issue. When taking all the spark plug leads out and I start the engine
the engine runs smooth. No knocking and no tools left inside. When testing the spark plugs one lead has no power
and maybe the spark plug below the coil pack as well. I'm going away for a couple of days to the country. It is work
related. Lucky in that town I have a friend who has a spare E280. With a set of extra bits I should fix the
problem. The knocking noise was more intense due to the fact the the engine damper has no rubber boot
left. I'll keep you informed once I have the spare parts.

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benzy53
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Re: 104 engine noise after changing rocker cover seal

Post by benzy53 » Fri 24 Feb, 2017 6:26 pm

I found the problem and it is that there is no power going to the first coil pack. As it is more a less
a concealed wiring loom looks like a new one has to be installed. My question how much would it cost
and is it worth to do. The car is a W124 sedan 1993 340K run awesome and everything works.
Any one for bits if I have to wreck the car. Got RWC just a week ago.

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benzy53
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Re: 104 engine noise after changing rocker cover seal

Post by benzy53 » Fri 31 Mar, 2017 3:50 pm

Update on my engine noise
I installed a new wiring loom and now the car runs like a dream again. I really fell
in love with the 104 engine. It is a great car, E280 W124 sedan, for going around
town. For long distance my 300TE W124 is perfect and the SLS makes it a smooth
run. Sorry guys the car is not up for wrecking jet, to much life still in.
Cheers benzy53

CraigB
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Re: 104 engine noise after changing rocker cover seal

Post by CraigB » Fri 31 Mar, 2017 4:35 pm

good news! first time i have seen the thread - don't really know your engine either. Looks like a bit of a monologue for a bit so thought i would respond. I was thinking something that has moved, wrong spark plugs too long, more along the lines of closing it up and not firing. Just yesterday had a friend telling me about his noise in the top end that appeared on a ford cleveland block he had rebuilt - found a hydraulic tappet with play - moved it back and forth a bit and restarted and all fixed - must have been a bit of something, maybe gasket sealer or something that had blocked the tappet and moving it allowed it to work again. Just adding those as other possible reasons if someone see the title of the thread searching for solutions some time in the future.
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Ivanerrol
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Re: 104 engine noise after changing rocker cover seal

Post by Ivanerrol » Tue 04 Apr, 2017 10:24 pm

The dreaded eco wiring issue strikes again.
The wiring to the coils are acutely susceptible to break down.

New wiring loom even though a little bit pricey will give peace of mind.
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