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

V12 constant ticking, normal or bad?

 
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Old 07-26-2016, 11:37 PM
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Default V12 constant ticking, normal or bad?

Hey there Picked up a "1986 jaguar XJ12 Vanden Plas",its my first jag and im just growing to love it more and more got some things to fix up but i love the v12 its been running decent but theres a constant ticking noise under the hood, i cant hear it when the hood/bonnet is closed, when its open its pretty noticable and and speeds up with the RPM, but once the motor revs high enough it drowns out the noise
Here is a link to a video of the engine idleing


I was maybe thinking a dropped valve or tension for the timing belt but not to familiar with any of that so If you have an idea what it might be pls post suggestions , and if it is just the motor running regulary dont critisize , ive never owned a vehicle with a v12 before

Please help inform me on this engine
 
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Old 07-26-2016, 11:47 PM
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Im thibking its running smoothly but just to be sure i want to know that sorta ticking sound is normal
 
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Old 07-27-2016, 03:52 AM
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Firstly, welcome to the Forum.

That sounds like very noisy injectors.

It does not sound loud enough for tappets, and is definately NOT a valve seat issue.

NO timing belt on the V12, a very long chain and a boomerang style tensioner. Usually good for 500K miles.

I would get some serious Injector Cleaner, your market will have its favourites, and pour it into a tank with minimal fuel.

I usually pour the whole bottle into 20ltrs of fuel, and then DRIVE it, get some miles on it. That Cleaner will take a while to clean them up, but it will work. Repeat regularly.

I also detect a slight hesitation as you rev it, and that will be consistant with injector issues.
 

Last edited by Grant Francis; 07-27-2016 at 03:55 AM.
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Old 07-27-2016, 09:25 AM
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I like Chevron's Techron. I'm sure others are as good or perhaps better!!!


At SMOG inspection time for my Jaguar. I run one tank down low.
Add only about 5 gallons of 93 . Add the large size bottle of parts store sourced TECHRON injection cleaner. Result, a concentrated dose of cleaner. Drive heartily for a week.
Then get it good and warm and immediately to the test station.


Carl
 
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Old 07-27-2016, 11:15 AM
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Originally Posted by Grant Francis View Post
Firstly, welcome to the Forum.

That sounds like very noisy injectors.

It does not sound loud enough for tappets, and is definately NOT a valve seat issue.

NO timing belt on the V12, a very long chain and a boomerang style tensioner. Usually good for 500K miles.

I would get some serious Injector Cleaner, your market will have its favourites, and pour it into a tank with minimal fuel.

I usually pour the whole bottle into 20ltrs of fuel, and then DRIVE it, get some miles on it. That Cleaner will take a while to clean them up, but it will work. Repeat regularly.

I also detect a slight hesitation as you rev it, and that will be consistant with injector issues.
,
Thanks for the reply and i will try that out and hopefully thats the issue im having
Thanks

,cole
 
 
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