S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

How often do rocker arms & valve springs wear out?

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Old 07-08-2006, 11:36 AM
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380 SEL 1982
How often do rocker arms & valve springs wear out?

While I am in there for stem seals, how do I see if rocker arms and or valve springs are worn out? Do they commonly go on these cars?
Old 07-09-2006, 11:48 AM
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96 S600 Euro, 91 560 SEC, 88 300TE, 87 560SEL, 86 560SL, 80 280SE, 64 Austin Healey 3000MIII
Well, that depends on a Lot of factors... mileage, oil change frequency, what kind of condition did the car work in etc, etc..

More often then not I don't see valve spring needing replacement. Rockers are fairly common..although if you have eaten a rocker or two you are going to need a cam as well.

How many miles on your car? VSS's are usually a band aid over the underlying problem of bad valve guides.

Jonathan
Old 07-09-2006, 04:17 PM
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380 SEL 1982
only 70k

only 70k on the car. I put 7K on in the last year, before that there was only 500 miles or so a year for the previous 13 years. My grandfather drove the car regularly from 1983 when he bought it second hand to 1992 when he died. Maintenence was always done, though the coil wire might not have been removed to pressurize the oil lines at startup.

I have heard that VSS can be a bandaid for bad guides, but I have also heard that VSS can get brittle and work their way loose during extended storage.

I heard a ticking noise coming from under one of the valve covers (I used a stethoscope), had some smoke at startups, then smoke all the time. I don't drive the car now since I don't want to make things worse. Timing chain was updated to double row not too long ago.
Old 07-12-2006, 09:19 PM
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96 S600 Euro, 91 560 SEC, 88 300TE, 87 560SEL, 86 560SL, 80 280SE, 64 Austin Healey 3000MIII
@ that low a mileage everything should be in tip top shape.

Yes, the seals can get brittle, especially w/ lack of use so I would be comfortable installing new ones given the circumstances.


Once you get your VSS installed you should be good to go. I'd run the car on synthetic if the rest of the engine has no leaks.

Happy motoring!
Jonathan
Old 07-12-2006, 09:30 PM
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380 SEL 1982
thanks for the good words

Thanks..
could the ticking that preceded the smoking be a VSS which worked its way loose?

I have been using Amsoil Euro Formula 5W-40 since about 62K and for the last two years. (I have been sending it to my grandma to put in before I got the car.)

Before that it had Pennzoil Dino 10W-40 since my grandfather bought it with about 8-10K, before that who knows.

Any other $5-$50 plasticky bits that I should replace while in there?
Old 07-12-2006, 09:30 PM
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380 SEL 1982
thanks for the good words

Thanks..
could the ticking that preceded the smoking be a VSS which worked its way loose?

I have been using Amsoil Euro Formula 5W-40 since about 62K and for the last two years. (I have been sending it to my grandma to put in before I got the car.)

Before that it had Pennzoil Dino 10W-40 since my grandfather bought it with about 8-10K, before that who knows.

Any other $5-$50 plasticky bits that I should replace while in there?

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