M127 valve stem seals?

1961-1968: a.k.a "Finnie" or "Heckflosse" models
190, 190D, 200, 200D, 220b, 220Sb, 220SEb, 230, 230S, 250SE coupe, 280SE coupe, 280SE 3.5 coupe, 220SEb cabrio., 250SE conv., 280SE cabrio., 280SE 3.5 Cabrio., 300SE, 300SE coupe, 300SE conv., 300SEL
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Shoudaboughtacoupe1965
Dernburg Wagon
Posts: 8
Joined: Thu 31 Mar, 2016 7:05 am
Model you own: w111
Location: Dandenong Ranges Victoria

M127 valve stem seals?

Post by Shoudaboughtacoupe1965 » Thu 01 Mar, 2018 2:43 pm

Hello folks. If my car is blowing smoke and my dip stick is constantly being pushed out of it's tube, I suspect my valve stem seals are no longer doing their job? If they need doing how hard is the replacement process on a M127 engine? I should add that watching youtube is the closest that I have ever come to tackling this type of job!! Cheers Corrado
1965 W111 220SEB Sedan
1966 250SE W108 (Rusted out but haven't the heart to put to sleep)
1962 220S W111 Sedan (sold 1995)

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Bartman4800
300 SLR
Posts: 1870
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: M127 valve stem seals?

Post by Bartman4800 » Thu 01 Mar, 2018 4:59 pm

I am afraid renewing your valve stem seals will have little effect.

You have excessive blow-by, caused by worn piston rings and or bore.
There could be a small chance that your sump vent (on top of the cam cover) is blocked, check that first...

Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

User avatar
Shoudaboughtacoupe1965
Dernburg Wagon
Posts: 8
Joined: Thu 31 Mar, 2016 7:05 am
Model you own: w111
Location: Dandenong Ranges Victoria

Re: M127 valve stem seals?

Post by Shoudaboughtacoupe1965 » Fri 02 Mar, 2018 10:10 am

G'day Bart. Many thanks for your reply. Any chance you could dig up a picture of the sump vent? Cheers Corrado
1965 W111 220SEB Sedan
1966 250SE W108 (Rusted out but haven't the heart to put to sleep)
1962 220S W111 Sedan (sold 1995)

User avatar
Bartman4800
300 SLR
Posts: 1870
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: M127 valve stem seals?

Post by Bartman4800 » Fri 02 Mar, 2018 1:21 pm

https://en.wikipedia.org/wiki/Mercedes- ... engine.JPG

It's the left most black hose that comes off the rocker cover (angled 90 deg)
There is a small hole underneath it, in the bushing. It could be filled with crud stopping the vent to work.

Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

User avatar
Shoudaboughtacoupe1965
Dernburg Wagon
Posts: 8
Joined: Thu 31 Mar, 2016 7:05 am
Model you own: w111
Location: Dandenong Ranges Victoria

Re: M127 valve stem seals?

Post by Shoudaboughtacoupe1965 » Sat 03 Mar, 2018 10:29 pm

Thanks Bart. The tube looks quite clean so I suppose it's time to think about rebuilding!
1965 W111 220SEB Sedan
1966 250SE W108 (Rusted out but haven't the heart to put to sleep)
1962 220S W111 Sedan (sold 1995)

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