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  #1  
Old 04-19-2007, 03:54 AM
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Thumbs up Two M103 questions, EGR and valve springs

I'm going to be installing new valve seals on my 300SEL, would it make sense (to me it does) to go ahead and replace the springs while I am already in there? Motor has around 254k on the ticker currently.

Also, is there a reason MB installed EGR on the '90+ M103s? I can assume for lower NOx levels due to tighter US emission laws.

Thanks

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Old 04-19-2007, 05:56 AM
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You really need to use a calibrated spring compressor to determine if they need to be replaced. Don't replace them unnecessarily, i.e. save some money.
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  #3  
Old 04-19-2007, 07:17 AM
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Thumbs up

Quote:
Originally Posted by wbain5280 View Post
You really need to use a calibrated spring compressor to determine if they need to be replaced. Don't replace them unnecessarily, i.e. save some money.


Where do you score one of these?
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
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  #4  
Old 04-19-2007, 08:03 AM
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Yes valve spring replacement is a very GOOD idea...ONE of the most overlooked components on an engine!
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  #5  
Old 04-19-2007, 09:36 AM
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Thumbs up

For the $6/ea or whatever they run, I can swing $72 + tax.
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
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  #6  
Old 04-20-2007, 01:52 PM
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I will be doing the valve stem seals on my M103 pretty soon, and when I do I will also replace the springs. For a hundred bucks, it's cheap insurance while you're in there, and besides - you are saving a boatload of cash doing it yourself anyway.
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  #7  
Old 04-20-2007, 01:57 PM
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hmmm ....first i have heard of re-doing the springs

i have to do seals on two cars...
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  #8  
Old 04-20-2007, 02:16 PM
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Believe it or not, the springs actually lose their ability to recover from deflection, and in some cases can even break if they become worn and are not replaced. I have seen it more than once. If you already have a spring compressor around the springs it just makes sense to replace them.

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