Bought this car as a project, and it sounds like its going to be that and some. I'm getting misfire on cylinders 2,4,6,8, on the first 100 revs. Engine sounded like it needed timing chains for the few seconds i ran it. It sounded awful. I was doing compression testing and cylinder 8 (drivers closest to firewall) does not have any pressure. Car has 161k miles, and i was wondering if it it most likely a bent valve and I need a new head or is it usually the whole motor is shot? Also when I do timing chains how do I tell what pitch I have?



Thanks!!!

 

Have you checked the injectors

 

Checked as far as? Correct voltage? I didnt really pay much attention to them, I figured the odds of all 4 on one side being bad at the same time were very slim. Spark plugs looked good

 

UPDATE: I have good compression on all 4 cylinders (drivers side) , it wasn't screwed in correctly. So could I be in luck and it just need timing chains replaced?

 

Timing chain (or at least tensioner+guide) replacement is a given if you can hear timing noise - I've detailed this in my rebuild thread (which may also have some useful pictures for you) here, but essentially the 2010-2012(ish) 5.0 engines had a flaw where the metal in the back of the timing guide was softer than the metal in the tensioner pin, so over time the tensioner wears a hole in the back of the timing guide, resulting in slack in the chains. Updated timing guides have an insert of hardened metal to avoid this problem, but you'll need to replace the guides, tensioners, and (to avoid risk) chains.

I also have a suspicion that Jaguar is running low or even out of 6.35mm chains/VVTs etc as the parts prices are insane and I've seen invoices for repairs where they've had to change out the aux timing gear to 8.0mm, which involves buying a new fuel pump cam as the sprocket is integrated into it, which doesn't come cheap! I updated all of my timing gear to 8.0mm with my rebuild because the Land Rover parts were cheaper than Jaguar and they all seem to be 8.0mm.

My chains were so slack that they'd worn burrs into the webbing on the block where they'd been rattling around!

 

Thanks!! Ill replace it all, so right now I have the 6.35mm for sure? Ill go check out your rebuild as well thanks!!

 

I can't say, as according to the service manual both pitches were fitted, and short of measuring the pitch of a chain/VVT etc I'm not sure of a way of identifying them I'm afraid.

 

how do you measure the pitch on these chains?

 

At a basic level, measuring the distance between the chain links - a $20 digital calliper would probably have enough accuracy. Since there were only two pitches, it should be pretty easy to check whether you have the 6.35mm or 8.0mm chains. Doing this without removing rocker covers, which requires removal of injectors etc, would be tricky but not impossible - I reckon you could get away with removing cam solenoids & sensors from the upper timing cover and just removing that.

 

Im right at 8.0mm from pin to pin between links. if that sounds right as far as points measured

 

Sounds like you've measured it correctly then, and you're running 8.0mm gear. Which is good. You still can have timing guide wear that requires component replacement with 6.35mm or 8.0mm chains, but the 8.0mm parts are far more readily available, and cheaper. Given the prices of 6.35mm parts, if they're even available, I suspect JLR have dwindling supplies.

 

161k miles, and it doesnt look like its even been done guess im at least a little lucky its the 8mm