modification to extract ozone
- Thread starter turnerkl
- Start date
Dave Wilkinson
New member
Kevin,
The distributor venting modification was introduced by Porsche to prevent the build-up of ozone within the distributor because it attacks the material of the secondary distributor drive belt. Given that your car has been running without the mod for the best part of 15 years I would think it advisable to get the belt examined and/or changed at the same time as installing the essential venting kit. The venting kit itself is only about £10 and is very easy to fit yourself. The belt, on the other hand is another matter altogether!! Porsche will not sell you a belt although some indies will now do a belt change - but it's a fair bit of labour. Not so bad if you can do it yourself but it means dismantling the distributors and rebuilding with a new securing pin.
BTW, have you registered your car with the Jubilee Registry (http://www.jubi.pocg.de/)??
Regards
Dave
The distributor venting modification was introduced by Porsche to prevent the build-up of ozone within the distributor because it attacks the material of the secondary distributor drive belt. Given that your car has been running without the mod for the best part of 15 years I would think it advisable to get the belt examined and/or changed at the same time as installing the essential venting kit. The venting kit itself is only about £10 and is very easy to fit yourself. The belt, on the other hand is another matter altogether!! Porsche will not sell you a belt although some indies will now do a belt change - but it's a fair bit of labour. Not so bad if you can do it yourself but it means dismantling the distributors and rebuilding with a new securing pin.
BTW, have you registered your car with the Jubilee Registry (http://www.jubi.pocg.de/)??
Regards
Dave
Steve Brookes
Moderator
When was the breather pipe modification introduced. I'm suprised that Kevin's 1993 car hasn't got it. Does this mean that no 964s came out of the factory with the modification?
Dave Wilkinson
New member
Steve,
I can't find any specific reference to the date of introduction other than "late in the model life". 964 production did go on until 1994 so I, too, am a little surprised that a Celebration car would not have it.
[edit] Since I wrote that reply I've found a copy of the TSB issued by Porsche in March 1994 on the subject which indicates that production units from August 13th 1993 were fitted with the ventilation kit.
[edit2[ Just to preempt your question, Steve, the TSB's are available online here. It's a very useful reference from time to time.
Dave
Steve Brookes
Moderator
That's good information Dave. It explains why 993s had it fitted as standard. On the presumption that celebrations were introduced for MY93 rather than just 1993 then of course a number of them (including Kevin's) would have left the factory without the mod.
turnerkl
New member
Mine was actually registered in august 93 so just missed out!
Dave - i'm in the process of registering with the jubilee register - just taken a bit longer than planned
Based on discussion above when next service comes up in a few months i'll ensure the distributor belt is investigated and venting modification fitted
thanks for the prompt advice
Dave - i'm in the process of registering with the jubilee register - just taken a bit longer than planned
Based on discussion above when next service comes up in a few months i'll ensure the distributor belt is investigated and venting modification fitted
thanks for the prompt advice
Ian Bloxsom
New member
Hello,
if Porsche won't sell a belt where can this be bought from? Or do the independants stock them? [8|]
if Porsche won't sell a belt where can this be bought from? Or do the independants stock them? [8|]
Many online Porache indies sell them ..
for DIY try
http://www.type911shop.co.uk/shop/category_384/Belts.html?shop_param=cid%3D494%26
All for £10 and they have instuctions as well on the site under Tech tips. Its not a very big job but I have it shown on the Engine thread URL below
for DIY try
http://www.type911shop.co.uk/shop/category_384/Belts.html?shop_param=cid%3D494%26
All for £10 and they have instuctions as well on the site under Tech tips. Its not a very big job but I have it shown on the Engine thread URL below
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