fv1609 Posted March 28, 2011 Share Posted March 28, 2011 Those of you who have Rover 24v systems have no doubt noticed that the black filter box with the ballast resistor has a date stamped on the top. There are usually 3 stampings, CH26 & to the right of it a number that seems to change & on the line below a month & year. However I have so far only identified (from the boxes I have) 62, 69 & 70. I have seen a couple of NOS ones which are undated. I have not been able to see if the capacitors were dated. Maybe the capacitors in these are of later & more reliable design & date monitoring was no longer required? Inside you will find the capacitors are marked with a year usually the same as the box. Capacitors do deteriorate with time & although this would become increasingly obvious when the distributor capacitor fails, it might not be noticed in the filter box. Extreme failure would mean raised levels of ignition interference on the radios. I wonder whether owners of FFR vehicles when they next look in the engine bay could make a note of the number to the right of CH26 & the date stampings please. Then to see if that filter box date is the same age as the vehicle or whether a pattern emerges of replacement after say 10 years. Or maybe they were only replaced if interference became a major issue? Many thanks. Quote Link to comment Share on other sites More sharing options...
airportable Posted March 28, 2011 Share Posted March 28, 2011 Hi Clive, my Airportable, 1980 CH26 47206D 3284 Andy Quote Link to comment Share on other sites More sharing options...
fv1609 Posted March 28, 2011 Author Share Posted March 28, 2011 Andy thank you for looking. CH26 is the Lucas general number for the filter unit. So far I have identified specific types 4716A 47206 47206A 54483158 552606 So 47206D is another one. The very early filters had 2 capacitor & 1 choke, later versions had an additional capacitor & choke. I'm try to work when that happened. The 1962 box doesn't have the extras but the 1969 one does. Given your Rover is 1980 its tempting to think 3284 refers to 1984? Quote Link to comment Share on other sites More sharing options...
touchwood 2a Posted March 28, 2011 Share Posted March 28, 2011 Hi Clive, I have from Series 3 FFR CH26 47206D 2075 Jarda Quote Link to comment Share on other sites More sharing options...
fv1609 Posted March 28, 2011 Author Share Posted March 28, 2011 Thank you Jarda. What year is you vehicle I wonder? I'm tempted to think 2075 in some way refers to 1975. Quote Link to comment Share on other sites More sharing options...
touchwood 2a Posted March 28, 2011 Share Posted March 28, 2011 Clive, Unfortunately, I don't know the year of the vehicle. I bought the filter on ebay, just know that it was used from series 3 FFR. Jarda Quote Link to comment Share on other sites More sharing options...
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