Rattling sound in engine - Mercedes Benz SLK Forum

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#1 Old 04-04-2019
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Rattling sound in engine

Hi guys, last week I started my car after a month of standing still.
A rattling sound came out of the engine for about 2 to 3 seconds.
Then everything was fine.
I know it is the lifters running out of oil when standing for a long period of no starting.
My car has 22k miles on it.

My question, is there any way to prime the engine before starting after a long vacation?

Like taking out the fuel pump relay and cranking the engine for some seconds to prime the lifters?

Will this hurt something?

Thanks on advance...
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#2 Old 04-04-2019
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I’m no expert mechanic but I can’t imagine that would hurt a thing. It actually seems like a great idea. In fo mo info...
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#3 Old 04-05-2019
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Careful, you might burn the starter.

The speed and time required to generate oil pressure and reach the lifters is likely beyond what your battery and starter would like. Also the engine is still rotating so you didn't gain in terms of lifters. Also after removing relay there will be residual fuel pressure.
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#4 Old 04-05-2019
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Only if you spin fast enough the engine a few times from crankshaft pulley...

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#5 Old 04-05-2019
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turning over the engine using the starter, in order to build oil pressure, is fine. It's what you would routinely do after a fresh engine rebuild for example. However, in this case it isn't necessary. Even when some oil drains back from hydraulic lifters, it generally only takes a matter of seconds for pressure to build-up again. Historically, some engines have been particularly bad for this and in the 'bad old days' you might have to weight a few minutes befiore all of the lifters pumped-up!
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#6 Old 04-06-2019
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Rattling sound on startup

The sound is scary. I don't like that sound.
These cars rev up like 1300 or 1500 on start up?

My Kia Sorento starts up with a very low rev en than gradually go to a higher rev.
I think something like that is a better control module programming.

But anyway, maybe removing the plugs (engine will turn faster without starting) and fuel pump relay will do the trick?
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#7 Old 04-07-2019
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Maybe you can put a video on YouTube with good sound quality. Some of the members may put your mind at ease or offer more info.
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#8 Old 04-08-2019
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I am quite sure its the lifters, I am thinking of a way to avoid this.
I have to leave the car for a month or something for it to happen again.
After July (vacation) I will record the sound.
It will happen only when the car is not started for more or less a month.
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#9 Old 04-08-2019
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On that engine it's more likely the adjusters than the lifters.
You are concerning yourself with something that is not a problem and considering doing things that will become problems.
The spark plugs in this engine are indexed, plugs installed in the wrong orientation will result in terminal engine damage.
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#10 Old 04-08-2019
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Quote:
Originally Posted by VII7 View Post
The spark plugs in this engine are indexed, plugs installed in the wrong orientation will result in terminal engine damage.
Holy Crap (Frank Barone style). I’ve never heard of such a thing, and I’m planning to install new plugs in my 05 350 soon. What type of engine are we talking about and what procedure is advisable?

ps: my Google finger is in the shop ATM
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#11 Old 04-09-2019
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Quote:
Originally Posted by VII7 View Post
On that engine it's more likely the adjusters than the lifters.
You are concerning yourself with something that is not a problem and considering doing things that will become problems.
The spark plugs in this engine are indexed, plugs installed in the wrong orientation will result in terminal engine damage.
Say WHAT?

Please expand on this little theory.

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#12 Old 04-09-2019
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Quote:
Originally Posted by VII7 View Post
On that engine it's more likely the adjusters than the lifters.
You are concerning yourself with something that is not a problem and considering doing things that will become problems.
The spark plugs in this engine are indexed, plugs installed in the wrong orientation will result in terminal engine damage.
Not sure if you are trolling or what... So HLA's (hydraulic lash adjusters), lifters or tappets are all the same thing.

Others - Yes the newer direct injection engines do require the correct indexing of plugs. MB plugs have a spec, but aftermarket do not.
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#13 Old 04-09-2019
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Camshaft adjusters: the gears at front of camshaft, used for variable valve timing (this is what is referred to as an adjuster in MB around here).

Plug indexing applies to the DFI engines and is well documented by MB including instructions for warranty denial if plugs are found to be oriented incorrectly.

Due to geometry considerations for other important aspects of the engine, spark plugs are located off center for DFI engines. This creates the need for indexed spark plugs to ensure the flame front faces towards the center of the combustion chamber and not towards the cylinder wall. If the flame front faces towards the cylinder wall it will burn off the oil film resulting in cylinder scoring, the flame front will also reach the piston too quickly creating thermal overrun that can melt the piston.
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#14 Old 04-09-2019
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Originally Posted by Roxanne7169 View Post
Holy Crap (Frank Barone style). Ive never heard of such a thing, and Im planning to install new plugs in my 05 350 soon. What type of engine are we talking about and what procedure is advisable?

ps: my Google finger is in the shop ATM
This does not apply to your engine (m272).
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#15 Old 04-09-2019
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Please correct me if I am wrong.

So, indexed plugs should be used on the M276 engine right?
I understand that the MB plugs are designed to take the right position if torqued right.
So you are better off using only MB plugs..

Thanks for the good info bro....
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#16 Old 04-09-2019
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Quote:
Originally Posted by peroel View Post
Please correct me if I am wrong.

So, indexed plugs should be used on the M276 engine right?
I understand that the MB plugs are designed to take the right position if torqued right.
So you are better off using only MB plugs..

Thanks for the good info bro....
Mercedes spark plugs are in Fact NGK or Bosch depending on year and what deals they done with them at the time etc
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#17 Old 04-09-2019
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Originally Posted by Delucas View Post
Mercedes spark plugs are in Fact NGK or Bosch depending on year and what deals they done with them at the time etc
Correct, but that does not mean the NGK or Bosch aftermarket plugs will index correctly. They may be used in other cars that do not require the indexing and the aftermarket may be sold as such. This is one of the rare instances I would use MB only as it just isn't worth the possible problems.
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#18 Old 04-09-2019
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Originally Posted by VII7 View Post
Camshaft adjusters: the gears at front of camshaft, used for variable valve timing (this is what is referred to as an adjuster in MB around here).
Camshaft adjuster is what I always see them called, that makes sense to be a possible cause of the noise as they need to fill with oil to work properly.
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#19 Old 04-09-2019
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Yes, M276 requires indexed plugs. The recommendation would be to use MB branded plugs or only exactly the same manufacturer part number present in the MB plugs (Do not use interchange part numbers). A correctly calibrated torque wrench will provide for proper installation with these specially designed plugs, however repeated installation and removal might alter the final resting position.
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#20 Old 04-10-2019
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This does not apply to your engine (m272).[/QUOTE]

Thank you for this. One less “Mercedes land mine” for me to worry about. Instead I can focus on the “time bombs” .
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