Found Evidence of My V12 Failure! - XJ12 Will Not Make it to the Summer Meet
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- Опубликовано: 17 окт 2024
- After a few good signs I finally found the failure if my favorite V12. Now I can see evidence of how the distributor jumped time. My 1977 Jaguar XJ12 will sadly not make it to the summer meet.
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Hi Adam V12 Mike is correct the jack shaft gear is part of the jack shaft and there is no pin. What you are seeing is a small position drilling not a drive pin. Take a very close look at the other engine with the valley cover off. Plus getting the front cover back on without damaging the head gaskets is a problem unless you leave off the front cover dowels which is not a good idea. Good Luck
Be safe and do not risk anymore possible damage. You will enjoy the trip all the more without the worry of failure. Great channel thank you for posting. Best from the UK.
Many thanks for the effort you put in to generate this content.
Thank you!
I would think you could replace the jack-shaft with one from another of your v12s. Depending on how busy the business is, you should be able to do it in time for the big drive. Good luck in which every car you take. Sound like a lot of fun.
the jack shaft is not the problem..
The teeth on the dizzy gear don't look like they jumped timing. If the jack shaft is timing chain driven, then I would expect that the timing chain has jumped time. You need to check the camshaft/crankshaft timing relationship to make certain the cams are in TDC position when the crankshaft is in TDC position. When both cams and crankshaft are in TDC, you should be able to see that pin on the top of the jackshaft.
Exactly. I want to pull the front cover to check
If the jack shaft gears (sprocket bolts) seem to be in the right place maybe the pin sheared and the distributor drive gear has slipped on the jack shaft making it not possible to see the pin hole in the gear. Good luck Adam.
Oh bless you, what a blow. Hopefully you will get it sorted out soon 👍
Sadly it looks like it will need a full strip down, I wouldn’t want to risk any further damage. However maybe it’s an opportunity. How about building up one of your spare V12s to 6.0 with a modern ecu for a swap into this. I love the series 2 shape and the later V12 has even more effortless go, it would be my dream Jaguar :)
My money is still on the tensioner. Good luck Adam.
Yes the chain jumped timing!
Hi there I was just wondering if you know were I can get a ABS module for a 2005 XJ6 as there is nothing down here S/H and there is only new and that is worth more than the car and if has to come from the UK
Thanks
X-type is the best option for sure! Good luck!
Good video Adam,, I'm personally more concern about the underbody or oil pan if you hit such a large hole... What size of hole , that would stall a car.. lol.. that would be insane, that the timing chain slipped due to a hole.. personally if it is the chain,, then you know, the tensioners were shit already.. and you were lucky you found out now instead of during the long trip..
The jack shaft is unlikely to jump a tooth with the geometry of the chain drive….and it has virtually zero torque to transmit to the distributor….are you sure you’re not 1 turn away from TDC?? Take the cam covers off and check the cam positions at TDC. There are little notches in the camshafts that are vertical at TDC on both cams….a little “special tool” shows this…but visual inspection will do the trick. The position of the jack shaft relative to the cams or crankshaft is not relevant because you just need to make sure that the distributor is mated to the jack shaft so that cylinder no 1 has just had a spark event …within the factory settings ..with the engine at TDC. You can get this close and fine tune it with a timing light.
Adam. I feel for you. Sorry about the situation.
Can you turn over your white car’s engine until the pin shows up? and see how far off the timing is?
Thanks for posting. I run my own channel @OncaEngineering focusing on F-Type and I appreciate your consistency.
The series 2 xj6 would be the best to go on,would make some great content to.👍
You have made one important wrong assumption. The mark on the jackshaft is not a pin, it is just a timing mark drilled a couple of mm into the side of the shaft. The bevel gear is machined onto the jackshaft, so cannot slip!
Why don't you see that timing mark? Probably you are looking at the timing with the jackshaft and cams 180 degrees from the firing stroke. Another possibility is that the engine has been built with the jackshaft in the wrong position, this is not a problem as long as the distributor is timed correctly to the crank (and cams).
Well since it jumped about 50-60 degrees I don’t want to chance it. No damage has been done to the engine so far and I don’t want anything to get damaged.
The jack shaft must of jumped timing somehow.
Adam no pin on the jack shaft. Cannot jump teeth etc even with a broken tensioner. I think you could have diagnosed it wrong. Good luck.
I guess I have a different tolerance to summer heat . Since I live i Yuma AZ where in the summer its over 100 degrees every day and reaches 115 in July and August I do not run the AC until its over 100 degrees . I have no idea what is considered high heat for Sweden .
People from the North aren't as heat tolerant as people from the South. I'm from Canada and I would melt at 100 degrees!
Do you run a Jaguar in those temperatures in Arizona?
Better to use aircon all year round otherwise the seals dry out and create leaks.i never switch mine off on my cars from the day I have them till the day I part with them and never have a single problem with them.
Would it be possible to remove the center plate, as on the other engine and see if that little gear is solidly fixed on the shaft, or can spin or slip, with a pair of long nose Vise-Grip? Maybe on these early V12 the gear was installed in a different way, maybe with splines in the shaft instead, making the pin not necessary?
You can’t get to the timing chain from there, just the shaft.
Need to remove the front cover to see it all
I feel for you but it's not worth taking the risk. your right take your other jaguar
Bad luck Adam. Oh well , you can't win the all ..........😢
Give me a hint, I know that that Jackshaft has such a mark on the frontsprocket but frankly I don’t need it since I can insert the distributor and if necessary you can skip a tooth or more and since it has 14 teeth that would adjust 25.7 degrees and you can turn the housing almost 40 degrees so it should easily be possible to get the pointer in the correct position.
I have taken my dizzy apart this week and converted it for a camshaft positionsensor and I can adjust it at any desired angle if necessary.
You should get the pointer to 12 degree before TDC (at least on my E-Type that is)
and blast off.
So I don’t need that mark.
Well last time I drove it jumped 2 teeth, around 50 degrees.
I don’t want to risk anything happening when I’m far away from home.
Especially if the jumped happened at the timing chain and something is wrong with my tensioner.
@@LivingWithAClassic
How can it jump 2 teeth? Is it not properly engaged?
I am very interested since I am using this (whats left from the dizzy) to send the Crank and Cam position to the ECU and for that purpose it must run precisely.
@@LivingWithAClassic
Yes if you suspect a problem with the timing chain I would open the Camcovers and check that.
Because a friend of mine just had a valve hitting the 6A piston and the valve was bent.
So don’t take a chance.
Hi again. I need a favor from you in case you still have the distributor out.
Can you, using a feeler gage, measure the gap between the sprocket at the bottom end from the dizzy and the washer (with the bent nose) that sits between the sprocket and the bottom of the housing.
Thanks in advance.
Btw., did you check if the chain tensioner has been released? Just in case someone changed a chain but after putting everything together forgot to release (tension) it.
I would switch to electronic ignition anyway, to be honest.
It’s electronic from the factory on all V12s…
@@LivingWithAClassic I was thinking about a real electronic ignition without a distributor.
So you think the jackshaft has jumped its timing around the chain ? Or something has broken or stripped ?
Real shame if you can’t take the XJ12….. but the X-Type would be a great option if you can sort out the AC.
Your daughter would be pretty unhappy if you take the Green XJ6 without her !
Yes I think it has jumped at the chain.
I don’t want to chance it without having a look at the timing chain, sprockets and tensioner.
We’ll see which car I choose for the trip. It’s leaning towards the XJ6 at the moment
Rover v8
👍🇦🇺
I forgot to ask on the last message, do you have a connection, for the felt trim protectors when you open XJS doors?? I'm also looking for those steel trim pins that are behind the upper trim panels. there steel with serrated teeth, and when you push into those plastic holes they hold trim pieces..
Also my son and I are at the tail end of the restomod of xjs.. custom everything as you remember.. you should invest in one of those complete mobeck MFI/injection systems.. no more distributor, temp controlled idle valve.. all archaic.. now my son hits the custom Jaguar push button, the computer starts the engine, electrically controls the idle, fuel,, timing,, electric fans.. within a minute she drops down to a perfect steady 700 rpm.. and if we don't like, you program it for higher.. not cheap, but you will never have to worry about tuning ,, coils, ignition break down.. fuel economy improved,, power improved.. we removed almost 30 lbs of junk..