Tensioners
#1
#2
Most replace only the upper tensioners but there have been lower failures also. Chains do not appear to be a problem unless affected by the tensioner issues. Some have changed them, most have not. The answer to your question is based on what do you mean by 'higher mileage' and what are your plans for the car over the next several years.
. . . and welcome to the forum!
. . . and welcome to the forum!
Last edited by test point; 09-27-2011 at 02:41 PM.
#3
#4
I had an upper tensioner fail, it broke the secondary chain, so I decided while I was in there to replace all tensioners and chains. The chains might have been overkill, but all of the tensioners and guides were cracked and looked like they could fail anytime. I had right at 90k on my XK8 when it failed. Phil
#5
Higher mileage means 190k, all highway mileage though. I think that I will replace all of the tensioners and guides, I want to keep the car for a couple years, so I think the peace of mind will be worth it.
Incidentally, while I am asking questions, can you get the valve covers off a supercharged engine without removing the intercoolers?
Incidentally, while I am asking questions, can you get the valve covers off a supercharged engine without removing the intercoolers?
#6
Higher mileage means 190k, all highway mileage though. I think that I will replace all of the tensioners and guides, I want to keep the car for a couple years, so I think the peace of mind will be worth it.
Incidentally, while I am asking questions, can you get the valve covers off a supercharged engine without removing the intercoolers?
Incidentally, while I am asking questions, can you get the valve covers off a supercharged engine without removing the intercoolers?
You do not need to remove the intercoolers.
#7
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#8
It was the crack I was referring to, I have worse pics!!
This pic shows what happens when the guides fail, the timing chain acts like a chain saw and starts working its way through the heads!!
As a side note the previous pic was from an XK that had done only 50K miles imagine how bad it might be after 150K
This pic shows what happens when the guides fail, the timing chain acts like a chain saw and starts working its way through the heads!!
As a side note the previous pic was from an XK that had done only 50K miles imagine how bad it might be after 150K
Last edited by XKRacer; 09-29-2011 at 01:16 PM. Reason: Added side note
#9
Well, under closer inspection, it looks as though the engine has dropped 3 valve seats, (it was bought as a non runner). I have a lead on a used engine that is already out of the car, but has a bottom end noise, could this be anything other than bottom end bearings, and do the ford engine parts cross over to the supercharged engine parts? I will still need to do the tensioners on the new engine I am sure.
#10
I do not know if other ford orientated engnines share the same internals, but I can tell you it is not a ford engine, all ford supplied was a sump plug the rest was completely Jaguar made.
The engine consists of 'sandwich plates' to hold everything together, if the bottom end is noisy you would be looking at new crank and bearings, nobody as of yet are doing regrind options for these cranks (AFAIK), they do wear very well.
If I was you I would look for a better engine or make sure you get a really good deal on the way you have found, of course you could get your heads sorted, might be a good time to have some fun.
I know where there are a couple of low mileage heads
The engine consists of 'sandwich plates' to hold everything together, if the bottom end is noisy you would be looking at new crank and bearings, nobody as of yet are doing regrind options for these cranks (AFAIK), they do wear very well.
If I was you I would look for a better engine or make sure you get a really good deal on the way you have found, of course you could get your heads sorted, might be a good time to have some fun.
I know where there are a couple of low mileage heads
#12
#13
If you have plastic second generation tensioners, you should have them replaced with the later generation metal-type tensioners...soon. The consequences (and related expense) when the plastic ones come apart are just too great to gamble with.
#14
If you have the plastic tensioners, even with low miles, you should take care of this soon as preventative maintenance. With a 2001, you probaly have the plastic tensioners.
Last edited by WhiteXKR; 10-24-2011 at 03:23 PM. Reason: clarification
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