ustawienie rozrządu jaguar xj8 - x305, jaguar [ Pobierz całość w formacie PDF ]
Tmingi chain and tensioner replacement
file:///D:/jaguar/rozrz%C4%85d/timingchain.htm
Timing chain tensioner, guides and chain replacement on X308 - 8/20/2005
Copyright 2005 jaguar@blackonyx.net
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be suited to your vehicle, or your level of skill or even legal in your State or country. I do not endorse any
modification/repair shown on this site. You assume all responsibility for any modifications/repairs that you make
to your vehicle, and must understand the consequences of each modification/repair you make. I cannot be held
responsible for your interpretation of these articles, or your implementation of these modifications/repairs.
Anyone who does not have the proper training or background in automotive work should not undertake any
mechanical project without proper supervision and instruction. I accept no responsibility or liability for incorrect
part numbers, torque values, or any other information. It is advised that any information presented should be
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Around 120,000 miles on the odometer the timing chain tensioners broke on out 1998 XJ8. Usually a ticking
sound is preceded by this condition, but we heard none. As they break further a very lumpy idle and lumpy
acceleration with a horrible rattle from the front of the engine happen. At this point, if it is possible, you should
stop driving any further and have the vehicle towed to your garage or your mechanics. Further driving could
cause the chain to skip. If the timing chains skip enough the pistons will come in contact with the valves and
bend the valves. Even though the XJ8 was driven 80 miles after the tensioner broke it had no valve damage. It
was just luck that the chain didn't skip enough to cause valve damage. This procedure isn't for the weak of
stomach and is a pretty involved process. If you don't think you can tackle it, don't. If the chain is not set up
properly it can cause further damage to the engine. While every part was not faulty at the time it is best to
replace it in case it is so you don't have to go back in when and if it fails. Also, some parts which I have found
faulty may not be in your case.
Parts:
-Both primary timing chains
-Both secondary timing chains
-Both primary timing chain outer guides
-Both primary timing chain inner guides
-Both primary timing chain tensioners
-Both secondary timing chain tensioners
-O-rings for the variable valve timing bush carrier (2 each side)
-O-rings for the variable valve timing solenoids (2)
-Two gaskets for the timing chain cover
-Two gaskets for the valve covers
-Four spark hole through valve cover gaskets
-Gaskets for the camshaft cover bolts (about 24)
-Crankshaft pulley o-ring
-Crankshaft pulley bolt (i have heard that they have been known to break upon installation)
Optional but highly recommended:
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Tmingi chain and tensioner replacement
file:///D:/jaguar/rozrz%C4%85d/timingchain.htm
-Spark plugs (now would be a good time to do those too)
-Thermostat
-Thermostat housing o-ring
-Coolant outlet pipe o-rings
-Coolant bypass hose (behind outlet pipe
-Upper and lower radiator hoses
-Accessory drive belt pulley
-Accessory drive belt tensioner pulley
Tools required:
-Camshaft setting tool E36401 (303-530) (you could get away with one like I did, but two makes it much easier)
(Jaguar specific)
-Timing chain tensioning tool E36402 (303-532) Only one needed (Jaguar specific)
-Wedges, primary chain E36407 (303-533) (Jaguar specific)
-Crankshaft setting plug E36408 (303-531) (Jaguar specific)
-Three foot pry bar
-The longest breaker bar you can find, usually 3' (for the crank shaft pulley bolt)
-10mm hexagonal bit (allen) (timing chain sprockets)
-24mm 6 point socket (15/16" will also work)
-Universal harmonic balance remover (available from sears) (need two 8mm bolts with ~60mm shaft length and
hardened washers)
-Torque wrenches (3/8" and 1/2")
-Medium strength lock tight
-Black RTV silicone
-Various metric sockets
For ease of reading I have broken this down into sections
A. Raise the front of the car:
1) Block both rear wheels and set the parking brake
2) Jack each end up either by the lower spring bucket or the jacking points under the front doors
3) Once at a suitable height to gain access to the rear of the engine place jack stands under the lower spring
buckets or the jacking points under the front doors (where ever the jack isn't).
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Tmingi chain and tensioner replacement
file:///D:/jaguar/rozrz%C4%85d/timingchain.htm
B. Drain the coolant:
1) Drain the coolant by either opening the radiator drain plug or removing the lower radiator hose
2) Use a drain tray to catch the coolant and dispose of properly.
C. Hood:
1) With the hood open remove the two lower most bolts on each hinge
2) Disconnect the upper end of each gas strut from the hood
3) Lower the hood, but don't completely close it
4) Pry out the grille inserts (vertical bars) from the top
5) Remove the 4 torx bolts securing the grille bezel. Not that the top bolts have several washers. Not their
position and be careful not to lose them.
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Tmingi chain and tensioner replacement
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6) With the grille completely removed you will now see a hole under each hinge that gives you access to the
remaining bolts on the hinges. Remove the two bolts.
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Tmingi chain and tensioner replacement
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7) Remove the hood. Having some one help you remove it would be the best idea and it isn't that heavy, but
bulky.
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