I'm getting a knocking sound from the left side of my engine (standing in front of the car looking back) I've removed the valve cover to check the chain and found the secondary chain to be tight however the primary chain appears to have some slack. i have not remove the the front plate to inspect the full timing system as yet. do you think the knocking is from the slack chain or do i have some other problem?

 

Which tensioners do you have? Plastic?

(BTW that's called the R not L side when you order any parts or use the workshop manual etc.)

 

Yeah, it's the plastic ones. but the chain is tight so i'm not sure there is a problem with that tensioner.

i was thinking it my be on of the guide on the main chain to the right side that is causing the noise because that chain is a little slack.

 

All the plastic ones fail. You're on borrowed time.

It's an interference engine so tends to be destroyed.

Plenty of detailed threads about this...

 

i'll get a new timing chain kit regardless if that's the issue or not (hopefully it is)

thanks!

https://www.amazon.com/gp/product/B0...A3RG6IQ0XGU0CF

 

Is the noise present at all speeds and does it come from the front of the engine? Are the timing marks on the camshafts in alignment? Refer to JTIS or the Workshop Manual for inspection procedure.

It is also possible that you may be hearing a 'knocking' sound caused by a worn gudgeon pin in one of the cylinders.

 

it is present at all speed, it sounds like it is coming from the front right (passenger Side)of the engine.
sounds alot like this guy, 4.0 just line my engine.

i was told by a friend that i can do a cylinder test with the engine running and removing coils to see it the knock is coming from the cylinder.

i also pulled some codes
P1383
P1388
thanks for the help!
where do i go from here?

 

Your really wasting your time until ALL the tensioners and chains and guides have been replaced. A lot of people sneak by just doing the secondary ones that are easier to get at as they are under the cam covers. That's a short cut so you can dump the car NOT a permanent repair.

This is a very tough DIY repair but can be done. At a shop it will be a multi-thousand dollar repair. IF you can find a shop who can do it right and have all the special tools required.

Do you want to sink that much money in a worthless car?
Do you have the JTIS yet?
Are you willing to learn enough to do the repair yourself?

I say that as a Jaguar fan and current owner of a 2005 STR who does almost all his own work.
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Based on the video, it seems you have a worn gudgeon pin or rod bearing. Since the noise seems to be from the top of the engine, I believe it is a gudgeon pin that is worn.

The engine must be disassembled and repaired, but given the low value of the S-Type, it may be best to either find a used engine or sell it for parts.

 

i can't trust any mechanic in this area to do the job correctly, but i will start by replacing all the timing chains and see if that does the trick. it's not my everyday vehicle so i can take my time and hopefully get it done myself. i couldn't get the JTIS to work on my computer which is windows 10 but i'll to get one that works asap.

 

Get the Workshop Manual from a vendor on eBay as a pdf.

The timing chains are not going to fix that noise.