What year did these engines start coming with the "updated" cam chain tensioner? On these "updated" engines is this cam tensioner issue less of a problem or is this problem completely eliminated now?

 

Gonna jump out there and say 2003 with the 4.2L engine. Techs, am I right?

 

AJ,

Information provided by Andre Voss (Belgium) reveals that the production commencement of aluminum bodied timing chain tensioners and multi-row timing chains was with engine number 01 08 13 0000. There is no direct correlation between engine number and VIN: however, the engine number is a date code. So engines built after August 13, 2001 are uprated to the latest specification.

Voss is the guy I told you about, and you know where to find him. Tell him I said "Hi".

 

4.2s can have tensioner problems too....lol

 

Are these problems just showing up? Does it appear the double timing chain and improved tensioners are making only a modest improvement over what the old 4.0 AJ-V8 had?

 

We have only had minor issues. Very few cars for the time the engine has been around. I would venture to say less than 1% even. Good motor the 4.2

 

Jag Tech

Where is the engine serial number located--I checked the labels under the hood and did not see anything that looked like the serial number you listed. Is it embedded in the emission label on the drivers side of the engine compartment?

I have an 01 XKR

thanks

Gary

 

Greetings,

The engine number on an '01 is stamped onto a vertical rib on the left (U.S. driver's) side of the engine block. Located just above the steering rack, it is a little difficult to see. Try your droplight under the rack, and look at the side of the block from in front of the suspension crossmember, looking rearwards. The numbers will start with 01 and follow up vertically. Good hunting,

Andrew Bernstein

 

I think on the XK it is also located on the upper front of the block.....close to the t-stat housing. Above water pump by cylinder head.....I cannot confirm that at this time however.

 

Andrew

you are not kidding with the Good Hunting comment--I have not been able to locate--but I will keep trying--when you suggest putting the light under the rack--you mean under the car--correct??

going back out to try again

gary

 

FJT,

I know the base of the thermostat housing tower, LH side, was the location up to and including 2000. I had read of the change for '01 and later, and found that to be the case on the last '01 motor I looked at. That's as definitive as I can be.

Gary, droplight and you beneath the car, light under the steering rack shining up. That's where it was on the '01 I looked at last week. Look at FJT's location also, it is equally hard to identify but you will see it if it is there on your engine.

 

Lol I have never looked that hard for them as we do almost everything by vin.
I can give you the engine serial number if the engine has never been changed.
I will let you "hunt" a little more first LOL.

Thanks for setting me straight JTO. None of us knows everything [8/|]

 

dude, don't you ever sleep?

 

lol.....nature of the beast.....6.15 here though.

 

OK, that's how many hours of sleep you flag, so that's about 3.9 real time sleep.

 

lol....don't need much more until the weekend.

5 hours a night is plenty.