Secondary tensioners
#22
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Bballan is correct make sure you follow the torque specs the cam hold down bolts feel like they are not being tightened enough because of how hard they are to break torque due to the sealant and age. Also you may see some fluid retained under as well this is completely normal. Be careful follow your torque specs and sequence it will go just fine. Cant stress rechecking the cam timing 2 to 3 times before buttoning it up. All of them I have done have gone great and I zip tie to keep the chain where it should be as well as mark it with a piece of chalk. Verify the cam timing after all is back together turning the engine over (its a 24mm i prefer the deep well) and turn it slowly by hand. Then I take out the fuel pump fuses in the rear fuse box in the trunk. The I relieve the pressure at the shraider valve so the car will not start. I then turn the motor over until the oil light goes out meaning oil has pumped through the system. remember these tensioners come with no oil and need to be pumped up by the engine to acually do their job. So even though they have been changed and such with no oil in them they can still jump a tooth on the timing chain if you try and start it without it being pumped full of oil, seen it happen.
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vincent661983 (07-06-2012)
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#31
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"Better replace" and "critical" are two different things.
You are experiencing why many folks just give up and sell these cars as is and why some of us pick up VERY good condition jags with timing tensioner problems for peanuts, fix them for very little $$ and drive them for years.
It is "critical" to replace the secondary tensioners, pretty "important" to replace the water pump and "a good idea" to replace the lower tensioners...
The difference between "critical" and "better replace" is about $2k.
If he only changes the upper tensioners, the only "opening up" he will need to do is the valve covers- we are talking less than 1 hour per side. If you do the lower tensioners/chains, now we are talking ALOT of work (READ: labor $$) I don't know the book time on that, bu I am guessing it is tween 8 and 16 hours. I still don't know if the timing chain tensioners broke, or if your chain skipped a tooth or if you have any bent valves..... thos would help to decide whether you need to do more.
You are experiencing why many folks just give up and sell these cars as is and why some of us pick up VERY good condition jags with timing tensioner problems for peanuts, fix them for very little $$ and drive them for years.
It is "critical" to replace the secondary tensioners, pretty "important" to replace the water pump and "a good idea" to replace the lower tensioners...
The difference between "critical" and "better replace" is about $2k.
If he only changes the upper tensioners, the only "opening up" he will need to do is the valve covers- we are talking less than 1 hour per side. If you do the lower tensioners/chains, now we are talking ALOT of work (READ: labor $$) I don't know the book time on that, bu I am guessing it is tween 8 and 16 hours. I still don't know if the timing chain tensioners broke, or if your chain skipped a tooth or if you have any bent valves..... thos would help to decide whether you need to do more.
#32
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"Better replace" and "critical" are two different things.
You are experiencing why many folks just give up and sell these cars as is and why some of us pick up VERY good condition jags with timing tensioner problems for peanuts, fix them for very little $$ and drive them for years.
It is "critical" to replace the secondary tensioners, pretty "important" to replace the water pump and "a good idea" to replace the lower tensioners...
The difference between "critical" and "better replace" is about $2k.
If he only changes the upper tensioners, the only "opening up" he will need to do is the valve covers- we are talking less than 1 hour per side. If you do the lower tensioners/chains, now we are talking ALOT of work (READ: labor $$) I don't know the book time on that, bu I am guessing it is tween 8 and 16 hours. I still don't know if the timing chain tensioners broke, or if your chain skipped a tooth or if you have any bent valves..... thos would help to decide whether you need to do more.
You are experiencing why many folks just give up and sell these cars as is and why some of us pick up VERY good condition jags with timing tensioner problems for peanuts, fix them for very little $$ and drive them for years.
It is "critical" to replace the secondary tensioners, pretty "important" to replace the water pump and "a good idea" to replace the lower tensioners...
The difference between "critical" and "better replace" is about $2k.
If he only changes the upper tensioners, the only "opening up" he will need to do is the valve covers- we are talking less than 1 hour per side. If you do the lower tensioners/chains, now we are talking ALOT of work (READ: labor $$) I don't know the book time on that, bu I am guessing it is tween 8 and 16 hours. I still don't know if the timing chain tensioners broke, or if your chain skipped a tooth or if you have any bent valves..... thos would help to decide whether you need to do more.
Very well said.
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I have not heard of 4th gen, where did you get that info. There are many writeups on doing the replacement. Click on the link below for one of them:
https://www.jaguarforums.com/forum/x...ics-how-52653/
Many members have ordered parts on ebay.
https://www.jaguarforums.com/forum/x...ics-how-52653/
Many members have ordered parts on ebay.