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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 |
Im thibking its running smoothly but just to be sure i want to know that sorta ticking sound is normal
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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. |
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 |
Originally Posted by Grant Francis
(Post 1504778)
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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