'66 250S Heat Riser Valve

1965 - 1972: 250S, 250SE, 300SEb, 280S, 280SE, 280SEL, 280SE 3.5, 280SEL 3.5, 280SE 4.5, 280SEL 4.5, 300SEL, 300SEL 6.3, 300SEL 3.5, 300SEL 4.5
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Stephen
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'66 250S Heat Riser Valve

Post by Stephen » Sat 31 Dec, 2005 2:02 pm

Hello one and all,
Hopefully a simple query and not a Pandora's box.
I have a copy of Chilton's Repair & Tune-up Guide MB 1959-70 and in the Maintenance Intervals table (p 20-21) they refer to the "heat riser valve" which they suggest to lubricate with kerosene every 6000 miles.
As I don't know what it is, where it is or what it does, and have been unable to find reference to it in a number of other publications (including the blue MB service manual (maintenance, tuning, unit replacement - passenger vehicles 1959 on-my copy of which makes no reference to the 250S, but came with the car) , I was hoping someone may be able to help me in this area.Thanks in anticipation of enlightenment.
Stephen.

Stephen
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Post by Stephen » Wed 11 Jan, 2006 10:43 pm

Come on guys, someone must know of this? With all the combined experience and expertise at our disposal, not even one reply? It may not be that important in the greater scheme of things, but it is bugging me that I can't find any reference to it. Could it be known by another name in other publications? Is it associated with the carbs perhaps? Is it even relevant to the 250S or has Chilton made a blue?

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OzBenzHead
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Post by OzBenzHead » Thu 12 Jan, 2006 1:05 am

Well, Stephen, not much point replying with a non-answer.

I've never heard of the device you mention - at least not by that name. I have manuals only for my 111, 112, and 116, so can't check what the official manual for a 108 might call it. My 108 is a '70 280SE, so don't know how different in minor detail it is from your 250, but I've owned him for half a million miles and 24 years and never heard of a heat riser valve.

Good luck!
OzBenzHead
Currently owned:
1965 W112 300 SE/C
1983 C126 380 SEC

and formerly:
1955 W180 220a
1965 W111 220 S
1970 W108 280 SE (my first Benz)
1973 W116 280 SE Crayford Estate (previously owned by Rolf Harris)
1980 W116 280 SE
1989 W124 300 E
1992 W201 180 E
1992 W201 190 E 2.0
+ numerous W108 and W116 rolling spares

and prior to my M-B enlightenment:
53 other cars of many nations, but mostly British oil-leakers (including 14 Rovers of the 50s and 60s) cursed by Lucas the Prince of Darkness. First car owned (at age 13): 1953 Fiat. Learned to drive in: 1927 Nash utility paddock-basher & Grey Fergie tractor. Driven distance (logged as at 30 June 2016): 4.6 million km.

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O319-coach
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Post by O319-coach » Thu 12 Jan, 2006 9:29 am

You have the same problem that most people who use non genuine manual have. Sooner or later they get you into trouble as they are full of mistakes. I have no idea what a "heat riser valve" is the only thing I can think of is that some of these cars had a paper element air cleaner and had a system with a wax pellet that sucked air from over the exhaust manifold when cold??

Ring our Spares department on 1300 787 300 and buy the right manual for your car. $220.00 and on CD-rom but worth every penny.
John Green
Independent importer of discounted genuine Mercedes-Benz parts.
Restorer of Concours winning cars.
Sponsor of this forum.
http://www.mbspares.com.au Toll free phone 1300 787 300

CraigB
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Post by CraigB » Thu 12 Jan, 2006 10:41 am

Sorry for no reply Stephen, but I am in the same boat. Never heard of it and can't even picture what it could be. The person I thought most likely to know has already responded. Chilton is American isn't it? Why not go onto an American forum and asked them? They talk about fenders and hoods so they might talk about heat risers too! Is the old vets mailing list active? If so there were some pretty knowledgeable people on there.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
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500SEC's
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Stephen
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Post by Stephen » Thu 12 Jan, 2006 8:17 pm

Don't take my second post the wrong way please, I was just trying to stir the pot a little. The replies that I have received have now put paid to my concerns. I've said as much in the past, that I have the greatest respect for any suggestions or advice, because, after all, there is a wealth of knowledge and experience amongst our combined contributors and things that seem trite to some may be all that is needed by others.
I am a lift mechanic/electrician by trade, so have a degree of mechanical sympathy. What I don't have is all the answers.
Stephen

Stephen
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Post by Stephen » Thu 12 Jan, 2006 8:22 pm

Thanks for your help.

CraigB
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Joined: Thu 23 Jun, 2005 1:18 pm
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Location: Hawthorndene (Adelaide)

Post by CraigB » Fri 13 Jan, 2006 10:25 am

No worries Stephen but out of curiosity I would say someone on the American one will have an answer or at the very least lots of opinions!
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

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