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In search of an answer to the hard-starting-when-hot CIS problem, I disassembled the fuel distributor from my 84 900S - now moved on to greener pastures - save for the doors/alloys/head/rad/ps/seats and miscellaneous items transferred onto my 86. What I found was interesting though I may not be much further ahead in terms of a solution.
I split the "case" in half removing the screws from the bottom of the casing. The inside was chrome-like, smooth as you would imagine a new one to be. There are four intakes/chambers for distribution to/from the various items, WUR, pump etc. To ensure the flow to each chamber does not leak (I assume) there are four o rings on the centre distribution rod (not sure of proper terms here). I also found that on the "seats" of two of the chambers there was some rust and the beginning of corrosion around the edges of two chambers.
Having just had a look at it now, some ideas may become more clear on how this thing actually functions. But for now it seems that if one or more of the o rings is damaged or shrunken this could cause a loss of pressure as fuel equalizes across adjacent chambers, though I cannot be certain of this.
Another possibility is that corrosion on the chambers themselves could lead to a slight leakage across chambers though again I am not certain of this either. It is also quite likely that the corrosion buildup happened after distributor removal some 7 years ago and so were you to take yours apart you would find nothing wrong with it. It is in surprisingly good shape for something that gets constant fuel exposure and is 24 years of age (unlike some of our kids).
It also strikes me that these things are "rebuildable" within limits at least wrt replacing o rings and polishing the chambers.
I would take a picture and post if I knew how and if anyone is interested.
posted by 209.197.157...
, Fri, 8 Feb 2008 15:14:43, Fri, 8 Feb 2008 19:28:52
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