W111 heater valve help please

[amazon69]

Hello all,

I need to do some work on my leaking heater valves. 280se w111 1970 coupe. They were pretty seized and gentle loosening has resulted in them leaking. I have read various links on here but cannot seem to find a walk through anywhere..maybe there is a similar approach to another car (w108 for example). Any help would be very much appreciated, thanks.

Dave

[P.C.]

Dave,

I googled "w108 heater valve rebuild" and found some interesting articles, and a few old forum threads.

[Tomguy]

You can access the valves themselves by pulling the glovebox liner/panel interior. The valves will need circlip removers, then you just pull them straight out. The rings to seal may be special order thru the dealer only.

[amazon69]

Thanks both. Further research has thrown up a few pointers, such as using a spark plug to help get them out. Doesn't look as onerous as first feared. Thanks for the replies.

[JMela]

Haven't done this repair myself, but one point I've noted is to mark the valves before they come out as to orientation. There are many different ways they can go in; only one is correct.

[gmog220d]

Found these on Pelican:

Mercedes-Benz 220/230/280/300 Sedan (1960-1967) W111 W112 - Heater System - Page 1

Apparently the same o-ring crosses to W114/W115. There are two o-rings used, though, and I cannot find reference to the smaller one that goes on the valve's shaft. I've rebuilt these a couple times and sourced the o-rings through a gasket/seal shop in Albuquerque.

Attached photo shows both o-rings on a W114/W115 valve assembly.

[JMela]

Here's a good write up, complete with parts #s:

http://w108.org/articles/heaterlever1.pdf