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Example of unvented. Not mine. The original C23601 caps were not as well finished as the repros. Cast in a Mazak type high zinc content material that discolours easily after polishing & has surface inclusions. Don't try & clean up with acidic aluminium brightners. They will fizz away thanks to Zinc content & make inclusions worse. They only respond positively to mechanical polishing. I have 3 cars. My primary resto & 2 donors. All had/have the same caps.
Last edited by Glyn M Ruck; May 1, 2019 at 04:51 AM.
Looks like the J12's were not always up to date then, the SPC's and J12's do not correspond, I don't have the earlier J12's so can't check, also SPC's would not quote parts that didn't exist when chassis numbers were built.
J12s began to be published in the late 50s. Not sure what method of control they (Jaguar) used prior to Ed.1. As a general rule parts show up in the J12 before the model is introduced and well before the SPC is issued.
J12s began to be published in the late 50s. Not sure what method of control they (Jaguar) used prior to Ed.1. As a general rule parts show up in the J12 before the model is introduced and well before the SPC is issued.
The Forward of the J12 would indicate that the SPC's are at least as up to date as the J12 see lower para "use in conjunction with SPC"
Skimmed over my copy of J12 and cannot see where "fully interchangeable" is stated against any part number , there are many parts where this applies, but I cannot see reference to this in the list.
Anyway it is patently obvious that the unvented caps C23601 under consideration here were introduced in S Type production mid 64 as confirmed by SPC & customer cars & recorded in the Register from JDHT certs of chassis production dates.
Last edited by Glyn M Ruck; May 2, 2019 at 08:19 PM.
Anyway it is patently obvious that the unvented caps C23601 under consideration here were introduced in S Type production mid 64 as confirmed by SPC & customer cars & recorded in the Register from JDHT certs of chassis production dates.
Absolutely, everything shows this to be the case Glyn, apart from the J12's we haven't seen, and the comments of Coventry Foundation, all posted literature proves the point.
"Fully interchangeable" is in your posted bulletin.
See your own post below
Originally Posted by Coventry Foundation
"Fully interchangeable" is interesting. The J12 normally states this. More work!
then my reply
Originally Posted by TilleyJon
Skimmed over my copy of J12 and cannot see where "fully interchangeable" is stated against any part number , there are many parts where this applies, but I cannot see reference to this in the list.
It was you that said the J12 normally states this, I know it was on the Bulletin. My point was that there appears to me, not a single part No. on my J12 that has any comment on any interchangeability, so your comment re "The J12 normally states this" did not appear correct.
