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CHANGING THE PLUGS ON A 850 850

The cover plate comes right off. You'll need a torx driver and I think there's one in the spare tire toolkit.

I ordered my plugs from FCPGroton.com, along with a cap and rotor for under $25. Bosch all the way, non-platinums for turbo, but this is usually cause for debate.

You'll need of course the correct plug socket, an extension and ratchet. I find it much easier and safer when installing the new plugs to use about a 8" section of rubber hose or fuel line, pressed over the end of the plug to start them in their holes. Very little chance of cross threading as you'll feel it long before you would using a ratchet and plug socket. Also, if your plug socket has the rubber insert to hold the plug, use it for removal, remove it for tightening. Sometimes, the rubber insert causes (in my case) the plug socket to detach from the extension and stay on the plug. PITA. A dab of dielectric grease on the rubber might help and is a good idea for the plug wire boots anyway. Helps keep moisture out and eases removal next time.

If you have access to a torque wrench, tighten the plugs to spec. Sorry, I don't have the figure with me. Another big debate about whether or not to use anti-sieze compound on the threads. I don't. Plugs can be easily overtightened and ruined. Not to mention the head's threads you're to protect.

Good luck,
--
Erwin in Memphis, '88 745t 183,000 miles, '95 855t For Sale






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