Removing coil packs...beware...
#1
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As these cars get older the oil seals around the top of the spark plug holes start to weep particularly towards the rear as it hotter.
While tracking down a restricted performance misfire I found the following.
The plug hoes can have 1.5in of oil in them and the plug fire fine as its inside the rubber tube attached to the coil. Once you take out the coil pack the oil floods the plug and when you put the pack back it floods inside the rubber tube and you get a misfire.
Unless when you pull the pack the tube is bone dry you must blast out the plug hole with compressed air before replacing the coil pack. (or taking out the plug)
To compensate for some lack of elasticity in the old rubber tubes I have put an "0" ring around the outside at the plug end to squeeze the rubber a little around the plug ceramic. Origin OD is 19mm so a 22mm x 2.5 nips it fine
While tracking down a restricted performance misfire I found the following.
The plug hoes can have 1.5in of oil in them and the plug fire fine as its inside the rubber tube attached to the coil. Once you take out the coil pack the oil floods the plug and when you put the pack back it floods inside the rubber tube and you get a misfire.
Unless when you pull the pack the tube is bone dry you must blast out the plug hole with compressed air before replacing the coil pack. (or taking out the plug)
To compensate for some lack of elasticity in the old rubber tubes I have put an "0" ring around the outside at the plug end to squeeze the rubber a little around the plug ceramic. Origin OD is 19mm so a 22mm x 2.5 nips it fine
The following 4 users liked this post by Pistnbroke:
#2
![Default](/forum/images/icons/icon1.gif)
As these cars get older the oil seals around the top of the spark plug holes start to weep particularly towards the rear as it hotter.
While tracking down a restricted performance misfire I found the following.
The plug hoes can have 1.5in of oil in them and the plug fire fine as its inside the rubber tube attached to the coil. Once you take out the coil pack the oil floods the plug and when you put the pack back it floods inside the rubber tube and you get a misfire.
Unless when you pull the pack the tube is bone dry you must blast out the plug hole with compressed air before replacing the coil pack. (or taking out the plug)
To compensate for some lack of elasticity in the old rubber tubes I have put an "0" ring around the outside at the plug end to squeeze the rubber a little around the plug ceramic. Origin OD is 19mm so a 22mm x 2.5 nips it fine
While tracking down a restricted performance misfire I found the following.
The plug hoes can have 1.5in of oil in them and the plug fire fine as its inside the rubber tube attached to the coil. Once you take out the coil pack the oil floods the plug and when you put the pack back it floods inside the rubber tube and you get a misfire.
Unless when you pull the pack the tube is bone dry you must blast out the plug hole with compressed air before replacing the coil pack. (or taking out the plug)
To compensate for some lack of elasticity in the old rubber tubes I have put an "0" ring around the outside at the plug end to squeeze the rubber a little around the plug ceramic. Origin OD is 19mm so a 22mm x 2.5 nips it fine
Worked for me! I'm always scavenging hose, wire and metal parts to cobble up quick fixes and was lucky to have the right thin wall tubing.
The following 2 users liked this post by TGraves:
Johnnywrench (04-13-2023),
piper 888 (04-20-2023)
#4
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That oil might be a good thing indirectly. Have found that it keeps plugs from seizing in place after a long time in service. i used a little copper anti-seize, some might argue not the best thing to do but was careful. However, since these are not well sealed areas, road water splash and dampness from condensation could work its way into there. Without oil or something else present, the plugs could get oxidized into place.
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Johnken (04-07-2023)
#5
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kstevusa (04-08-2023)
#6
#7
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Some good ideas! I ran into the same thing. You know, good thing I saved the ignition coil, maybe its ok after a good cleaning.
Ok, want a laugh? How did i remove the oil last time I was in there? I grabbed a hypodermic syringe, suck some in, squirt it out, suck in, squirt out . . .
At 4 or 5ml per "suck" - that takes a while :-)
FYI - Syringes come with needles of different guages. These were used to inject a medicine thats kind of thick viscosity wise, so I had some that worked okay. I wouldn't want to try to suck up oil with standard guage Syringes! (What a forum - learn about Jaguars and Syringes!)
John
Ok, want a laugh? How did i remove the oil last time I was in there? I grabbed a hypodermic syringe, suck some in, squirt it out, suck in, squirt out . . .
At 4 or 5ml per "suck" - that takes a while :-)
FYI - Syringes come with needles of different guages. These were used to inject a medicine thats kind of thick viscosity wise, so I had some that worked okay. I wouldn't want to try to suck up oil with standard guage Syringes! (What a forum - learn about Jaguars and Syringes!)
John
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mhannaoui
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