timing xj6
#1
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Dear members,
I am the owner of an xj6 serie 2 from 1975 3.4 litre . I have a problem with the timing of my engine. I checked the marker if 0 degrees is top death center. The timing for my engine is 4 degrees before tdc. But when I want to adjust the timing, the car will run much better when the ignition is about 16 degrees before tdc. Is there something I do wrong? I checked the ignition with the vacuum unplugged, measured from cilinder 6 . Hopefully someone could give me some help.
Harry
I am the owner of an xj6 serie 2 from 1975 3.4 litre . I have a problem with the timing of my engine. I checked the marker if 0 degrees is top death center. The timing for my engine is 4 degrees before tdc. But when I want to adjust the timing, the car will run much better when the ignition is about 16 degrees before tdc. Is there something I do wrong? I checked the ignition with the vacuum unplugged, measured from cilinder 6 . Hopefully someone could give me some help.
Harry
#2
#4
#5
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There have been 8 iterations of the XJ model name since 1968. This forum is for the cars made of aluminium from 2003-2009 which are totally different to all previous models in every respect. I am very surprised you don't know this, so assume you are new to Jaguars. The correct forum for your car is in the section titled "Jaguar Models (Classics)" and forum "XJ6 & XJ12 Series I, II, and III" Your car is a Series 2, but the Series 1, 2 and 3 are the same basic car with detail differences. The Series 3 cars have a slightly different body shell as the car was restyled in 1979.
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JagV8 (04-22-2021)
#6
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A man's got to know his limitations. ![Icon Biggrin](https://www.jaguarforums.com/forum/images/smilies/icon_biggrin.gif)
P.S. I assume or hope that "top death center" was a typo.
Last XK engine I worked on was a Mark10 an appropriately long time ago (basically the same as a Series 2 XJ6 engine) but the 4degrees sounds much more likely than 16degrees from memory. I trust the timing chain is set correctly, if disturbed.
"Jaguar XJ" on Wikipedia might help you out a bit with the 50+ years of different models. And "Jaguar XK Engine", which was replaced around 1987 on the XJ6(XJ40). Despite all that, XK is a lovely engine.
"Dirty Harry" appears to have the same problem since 2019. Amazing!
![Icon Biggrin](https://www.jaguarforums.com/forum/images/smilies/icon_biggrin.gif)
P.S. I assume or hope that "top death center" was a typo.
Last XK engine I worked on was a Mark10 an appropriately long time ago (basically the same as a Series 2 XJ6 engine) but the 4degrees sounds much more likely than 16degrees from memory. I trust the timing chain is set correctly, if disturbed.
"Jaguar XJ" on Wikipedia might help you out a bit with the 50+ years of different models. And "Jaguar XK Engine", which was replaced around 1987 on the XJ6(XJ40). Despite all that, XK is a lovely engine.
"Dirty Harry" appears to have the same problem since 2019. Amazing!
Last edited by ChrisMills; 04-21-2021 at 10:48 PM.
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