XJ6 & XJ12 Series I, II & III 1968-1992

Underhood rubber degraded

Old 01-19-2012, 05:05 AM
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Default Underhood rubber degraded

While doing a basic tuneup recently, I noticed that a lot of rubber vacuum hoses are getting very brittle on my 25 year old XK6 engine. Also, a lot of the rubber boots that cover the connections to the various sensors are either missing or cracked.

Does anyone have a good vacuum diagram of the engine bay for a 1987 series III XJ6? I have in mind to replace every hose if I can.

Also, what about all the rubber boots for the electrical. Is there a source for all replacement rubber bits which hopefully were common to many cars of the day? Even my battery terminal protective covers are cracked and ripped to pieces unfortunately.
Old 01-19-2012, 07:46 AM
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This might help


The injectors, coolant temp sensor, and thermotime switch all use garden variety connectors and boots. Google "Bosch injector boot" (or connector)

I've used generic battery cable/post covers with good results. I think I got 'em at Moss Motors

Old 01-19-2012, 12:10 PM
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Sorry I just noticed this thread, but as a follow up to my other post in the smooth idle thread, I replaced all my vacuum hoses this past summer with silicon hoses and that was very helpful. i also found plenty of hoses which were obviously leaking (small holes or cracks from age). It was a pretty painless process. Have the diagram in Doug's link handy and start tracing and looking around the engine bay. You've have to remove a few things like the AFM and air cleaner to get at everything and most of it can be reached from the top, but I remember a few that were made much easier once I drove the car up on ramps and reached them from underneath. When I ran my new line I actually tried to run them all over the intake rather than under it for 2 reasons: 1.) easier to get to in the future should the need arise and 2.) I figured the further away from the engine block the better to minimize heat degradation. Let me know if you have any questions, and I can try to help out.

Old 01-20-2012, 02:58 AM
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Thanks for the diagram link Doug,

Eric: Where did you get the silicon hoses? Are they superior to the rubber hoses I get and the auto supply store?
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