Tensioners, good news or bad?
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From: Yorkshire U.K.
Yes I have got that part. After watching it again closely on you tube it appears the cam is just eased up slightly to allow removal and back down. Same again on installation. It looks like it doesn’t move very far at all.
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From: Newport Beach, California
Given the age of the vehicle and the fact the secondary tensioners have cracks, it's false economy to just replace the secondary tensioners on an AJ-V8.
Replace the primary and secondary timing chains, guides and tensioners as the primary guides often crack or pieces break off and end up in the sump, if that hasn't already happened.
Here is a link to the AJ Engine Course with instructions on how to correctly install the timing chains:
https://www.dropbox.com/s/vqpy3bbjzd...e_168.pdf?dl=0
Pay particular attention to the instructions beginning on page 24 of the course (page 72 of the PDF). Note correct camshaft timing is 45 degrees ATDC not TDC as some people insist on using.
In addition there are two other things to bear in mind whilst replacing the timing chains:
Replace the primary and secondary timing chains, guides and tensioners as the primary guides often crack or pieces break off and end up in the sump, if that hasn't already happened.
Here is a link to the AJ Engine Course with instructions on how to correctly install the timing chains:
https://www.dropbox.com/s/vqpy3bbjzd...e_168.pdf?dl=0
Pay particular attention to the instructions beginning on page 24 of the course (page 72 of the PDF). Note correct camshaft timing is 45 degrees ATDC not TDC as some people insist on using.
In addition there are two other things to bear in mind whilst replacing the timing chains:
- Under no circumstances is the engine to be rotated in an anti-clock direction when viewed from the front of the vehicle as damage to the main and rod bearings is the result
- Use the correct tools shown in the Engine Course. DO NOT use the crankshaft holding tool to hold the crankshaft whilst removing the centre bolt from the crankshaft pulley
Last edited by NBCat; May 23, 2020 at 03:29 PM. Reason: insert missing word
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From: Puerto Rico
Given the age of the vehicle and the fact the secondary tensioners have cracks, it's false economy to just replace the secondary tensioners on an AJ-V8.
Replace the primary and secondary timing chains, guides and tensioners as the primary guides often crack or pieces break off and end up in the sump, if that hasn't already happened.
Here is a link to the AJ Engine Course with instructions on how to correctly install the timing chains:
https://www.dropbox.com/s/vqpy3bbjzd...e_168.pdf?dl=0
Pay particular attention to the instructions beginning on page 24 of the course (page 72 of the PDF). Note correct camshaft timing is 45 degrees ATDC not TDC as some people insist on using.
In addition there are two other things to bear in mind whilst replacing the timing chains:
Replace the primary and secondary timing chains, guides and tensioners as the primary guides often crack or pieces break off and end up in the sump, if that hasn't already happened.
Here is a link to the AJ Engine Course with instructions on how to correctly install the timing chains:
https://www.dropbox.com/s/vqpy3bbjzd...e_168.pdf?dl=0
Pay particular attention to the instructions beginning on page 24 of the course (page 72 of the PDF). Note correct camshaft timing is 45 degrees ATDC not TDC as some people insist on using.
In addition there are two other things to bear in mind whilst replacing the timing chains:
- Under no circumstances is the engine to be rotated in an anti-clock direction when viewed from the front of the vehicle as damage to the main and rod bearings is the result
- Use the correct tools shown in the Engine Course. DO NOT use the crankshaft holding tool to hold the crankshaft whilst removing the centre bolt from the crankshaft pulley
I know the 4.2 engines are good on the secondary tensioners, but what about the primaries?
Joined: Jan 2012
Posts: 6,068
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From: Newport Beach, California
The AJ33 and AJ33S both use Morse primary chains and do not typically fail. I have seen broken secondary tensioners on the AJ33 due to failure of the plastic 'slipper' surface, which cracks and can fall out causing the secondary timing chain to become slack.
The best method to use on any AJ-V8 is to remove the cam cover(s) and inspect the secondary chains and tensioners for cracking, breakage or slackness. Use a bore scope to inspect the primary tensioners and guide rails.
The best method to use on any AJ-V8 is to remove the cam cover(s) and inspect the secondary chains and tensioners for cracking, breakage or slackness. Use a bore scope to inspect the primary tensioners and guide rails.
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From: Yorkshire U.K.
pennies dropped at last!
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From: Spain
Just put the cam covers back on and take it to a specialist.
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brinny,
With the last question you asked, I'm not sure you should try to do this job! My advice is to have the Jag hauled to someone that knows how to do the job....get it done right and forget about it!
This problem occurred years ago to my 1998 XK Coupe! All I did was start the Engine and all Hell broke lose. Cost me several Valves and a New Piston...are (2)! This is what you are looking at...…..so take the advice of almost everyone on the Forum that knows anything about the XK8 or XKR...….Do it NOW!!! It has been awhile for me but I'll never forget the feeling and the writing of the BIG check!
Billy Clyde
With the last question you asked, I'm not sure you should try to do this job! My advice is to have the Jag hauled to someone that knows how to do the job....get it done right and forget about it!
This problem occurred years ago to my 1998 XK Coupe! All I did was start the Engine and all Hell broke lose. Cost me several Valves and a New Piston...are (2)! This is what you are looking at...…..so take the advice of almost everyone on the Forum that knows anything about the XK8 or XKR...….Do it NOW!!! It has been awhile for me but I'll never forget the feeling and the writing of the BIG check!
Billy Clyde
Just saying
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