After suffering a failure on Bank A I’ve set about a full update of the coils, ignition leads, application of the “cut & squirt” preventative solution on the distributor as per The Book. All going well until I approached re-assembly of the new components.
The car had the original Magnetti Marelli stamped coils (PN DAC4608 - Stamped BAE504), the H.T. terminal on which have a receptacle with a receiving “dish” (female) to accommodate a contact to the external surface of the formed head of the H.T. lead connector. This “dish” on the coil is exactly the same design on the terminals on the distributor.
The aftermarket coil has a different arrangement. On the aftermarket coil the H.T. terminal has a central pillar with no internal “dish” as such it appears the pillar is to insert into an internal detail on the H.T. lead connector. This doesn’t match with either the leads that were on the car nor the replacement after market leads (that look and measure exactly as per the leads on the car originally and built to OEM specification).
The part number for the aftermarket coil is IC443 and is a design meant to be built to OEM specification. After calling around a few stores specialising in Jag OEM parts and talking with some knowledgeable folk it appears that the OEM part with this “pillar” is distributed broadly.
I’m a little concerned about using the replacement coils as it appears that for the transmission of the spark to be successful it will need to arc between the pillar on the coil and the receiving side of the HT Lead.
So a couple of questions, is this the correct part? Has anyone else encountered this? If they have is the terminal compatible with the H.T. Leads?
Sydney - 1989 XJS convertible - 5.3lt Marelli ignition