JAGUAR V12 H.E.
SPARK PLUG REMOVAL
Byrnal Haley decided to change the plugs in his '89 XJ-S convertible. He put his wrench on the first one, and couldn't get it loose. He then tried harder, and the spark plug broke off. At this point he decided he clearly didn't know what he was doing, so he had the car flatbedded to his mechanic -- who broke off three more!
Obviously both Haley and his mechanic are applying obscene amounts of torque. Or, maybe not. Here's the half a plug Byrnal ended up with:
Yes, this is a "V-Power" plug, hence the little V notch in the center electrode.
Remember, the hex is 5/8", not the 13/16" found on most plugs. This thing is small. The fracture surface is really small. It's an annular surface, about 9/16" OD and 1/2" ID. The cross-section is therefore only about 1/32" across. It broke extremely cleanly. Honestly, the thing looks like it was designed to cleave here.
Once they broke, the mechanic was reportedly able to get them out with an EZ-out without further ado. This makes sense; since the entire center section of the plug comes out cleanly there's no need to drill, just jam the EZ-out in there and start turning.
Byrnal suggests it'd work even better if you heat the head and then chill the plug, perhaps with compressed air or CO2 or maybe just an ice cube. Dunno how you'll heat the head, though.
Folks, these plugs don't get stuck because some jerk installed them
with a 6-foot breaker bar; if he did, they'd break off during installation!
Please get this through your head: steel threads will seize in aluminum
if you don't use anti-seize compound. And get it through your mechanic's
Improve your Jag-lovers experience with the Mozilla FireFox Browser!
View the latest posts from our Forums via an RSS Feed!
©Jag-loversTM Ltd / JagWEBTM 1993 - 2017
All rights reserved. Jag-lovers is supported by JagWEBTM
Use of the Jag-lovers logo or trademark name on sites other than Jag-lovers itself in a manner implying endorsement of commercial activities whatsoever is prohibited. Sections of this Web Site may publish members and visitors comments, opinion and photographs/images - Jag-lovers Ltd does not assume or have any responsibility or any liability for members comments or opinions, nor does it claim ownership or copyright of any material that belongs to the original poster including images. The word 'Jaguar' and the leaping cat device, whether used separately or in combination, are registered trademarks and are the property of Jaguar Cars, England. Some images may also be © Jaguar Cars. Mirroring or downloading of this site or the publication of material or any extracts therefrom in original or altered form from these pages onto other sites (including reproduction by any other Jaguar enthusiast sites) without express permission violates Jag-lovers Ltd copyright and is prohibited