possible timing issue
#1
possible timing issue
My jag has been running like a diesel truck and making a rattling noise so I took off both valve covers to see is the timing was off or if the chains or tensioners broke. Once off the tensioners are in tact with no cracks and they are 3rd Gen But the the camshaft look slighty out of sync. How much play are the secondary and primary chains supposed to have and are the tensioners supposed to be springy or easily compressed? Anyone have any ideas or can point me into the right direction of what to do?
#2
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#3
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You may also want to search this forum for ideas. Here is one suggested thread:
https://www.jaguarforums.com/forum/s...bad-vvt-68687/
https://www.jaguarforums.com/forum/s...bad-vvt-68687/
#4
Im not sure about the oil I just recently purchased it...the only code stored was for the throttle body
Last edited by seagates5; 03-16-2015 at 08:08 PM.
#6
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Do you know the specifications of the oil you just purchased? If the vehicle is in the United States, do you know the API or ASTM ratings?
What code did you find? Kindly post it.
What code did you find? Kindly post it.
#7
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You need to renew the cam cover gaskets and spark plug well seals then clean the coils and spark plug wells of any oil residue.
You may need to replace the coils with quality units if you are still experiencing a misfire(s) to avoid catalyst damage.
You may need to replace the coils with quality units if you are still experiencing a misfire(s) to avoid catalyst damage.
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#12
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#13
I finally got some time and I confirmed the timing jumped and I think the valves might have hit(im hoping if they did its only minor). I was turning the crankshaft to get the cam flats lined up and as I was turning them a hit a really hard spot. When i got passed it they were no other spots and the cams flats didnt line up very well. Only the exhaust cam on the pasenger was off a bit. Should I do a leakdown test before I buy the tensioners kit or after?
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...I was turning the crankshaft to get the cam flats lined up and as I was turning them a hit a really hard spot. When i got passed it they were no other spots and the cams flats didnt line up very well. Only the exhaust cam on the pasenger was off a bit. Should I do a leakdown test before I buy the tensioners kit or after?
If the exhaust valves have indeed touched the pistons, it is possible to slightly bend a valve stem if you forced the crankshaft to turn. If the exhaust camshaft(s) timing is off, that must be correctly set using the special tools prior to conducting a leak-down test.
#15
Did you reinstall the upper tensioner that is shown in the photos prior to attempting to move the crankshaft? Did you move the crankshaft ONLY in a clockwise direction when facing the front of the engine? Did you have the spark plugs removed when checking the camshaft timing?
If the exhaust valves have indeed touched the pistons, it is possible to slightly bend a valve stem if you forced the crankshaft to turn. If the exhaust camshaft(s) timing is off, that must be correctly set using the special tools prior to conducting a leak-down test.
If the exhaust valves have indeed touched the pistons, it is possible to slightly bend a valve stem if you forced the crankshaft to turn. If the exhaust camshaft(s) timing is off, that must be correctly set using the special tools prior to conducting a leak-down test.
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#18
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Be certain the crankshaft locking tool is in place and then check the position of the inlet cams. If they are aligned correctly but the exhaust cams are out of sequence, you need to loosen the exhaust cam socket-head bolt and use a suitable wrench on the middle of the cam to get it to the proper position.
Once in position, use the camshaft locking tool to hold the cams from moving and then reposition the chain onto the exhaust camshaft sprocket so it can be reattached to the front of the cam. Be sure to use the cam tensioning tool to hold the sprocket while tightening the socket-head bolt. It is vital that you do not create any slack on the drive side of the VVT unit and under no circumstances is the VVT unit to be allowed to change position on the inlet camshaft.
If necessary, repeat the process with the other cylinder head.
Remember to take your time and ensure all components are reattached correctly.
From what I have seen with the 4.0 Litre engine, it is also possible that the lower primary chain tensioners, chain guides and chain tensioning blades may have excessive wear or cracks.
Once in position, use the camshaft locking tool to hold the cams from moving and then reposition the chain onto the exhaust camshaft sprocket so it can be reattached to the front of the cam. Be sure to use the cam tensioning tool to hold the sprocket while tightening the socket-head bolt. It is vital that you do not create any slack on the drive side of the VVT unit and under no circumstances is the VVT unit to be allowed to change position on the inlet camshaft.
If necessary, repeat the process with the other cylinder head.
Remember to take your time and ensure all components are reattached correctly.
From what I have seen with the 4.0 Litre engine, it is also possible that the lower primary chain tensioners, chain guides and chain tensioning blades may have excessive wear or cracks.
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seagates5 (03-28-2015)
#19
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You should be able to use a hex socket with a ratchet attached to loosen the bolt, or if there is not enough clearance, a hex socket with a 3/8-inch break bar. If you cannot get a socket onto the bolt due to the front timing cover clearance, use a 10mm key with a small pipe around it for increased leverage.
When loosening the bolt on the LH head, use the camshaft holding tool to prevent movement of the camshaft so there is no slack created on the drive side of the primary timing chain going to the VVT unit.
Be careful to not drop the washer into the timing case when removing the camshaft bolt.
When loosening the bolt on the LH head, use the camshaft holding tool to prevent movement of the camshaft so there is no slack created on the drive side of the primary timing chain going to the VVT unit.
Be careful to not drop the washer into the timing case when removing the camshaft bolt.
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seagates5 (04-01-2015)