Correct Bolt for New Secondary Tensioner
#1
Correct Bolt for New Secondary Tensioner
First, thanks for all the help with the '01 XK8. I removed the right valve cover and discovered one of the bolts for the tensioner was almost completely unscrewed.
Here's a picture of the length of the bolt. I received several messages asking me to make sure it's the right length since the newest tensioners require a different bolt.
Please let me know if this is correct OR if the previous owner/mechanic/whoever used the wrong sized bolts when upgrading the secondary timing chain tensioner.
Thanks!
Here's a picture of the length of the bolt. I received several messages asking me to make sure it's the right length since the newest tensioners require a different bolt.
Please let me know if this is correct OR if the previous owner/mechanic/whoever used the wrong sized bolts when upgrading the secondary timing chain tensioner.
Thanks!
#2
Join Date: Oct 2007
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Hopefully someone will have the correct dimension.
#3
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#5
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Norri (09-17-2013)
#7
Bolt length is conventionally measured from the base contact surface of the head to the tip.
Using that convention, I believe that the two numbers mentioned have been 35mm for metal tensioners and 40mm for plastic tensionsers.
JEPC lists both for the X308 which used both styles, and only 35mm for the X350 which only used the metal tensioners.
So .. 35mm for metal tensioners.
The ones in the picture would be 35mm. Should be a M6.
When installing make sure the holes are cleaned out to avoid hydraulic lock cracking the head and test install by running them down to the full depth by hand with the tensioner in place.
Using that convention, I believe that the two numbers mentioned have been 35mm for metal tensioners and 40mm for plastic tensionsers.
JEPC lists both for the X308 which used both styles, and only 35mm for the X350 which only used the metal tensioners.
So .. 35mm for metal tensioners.
The ones in the picture would be 35mm. Should be a M6.
When installing make sure the holes are cleaned out to avoid hydraulic lock cracking the head and test install by running them down to the full depth by hand with the tensioner in place.
Last edited by plums; 09-17-2013 at 06:43 PM.
The following users liked this post:
Norri (09-17-2013)
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#9
I always forget to order the shorter bolts so I just use a cut-off wheel and remove about 1/4" from the end of the old bolts, clean up the threads and reinstall them.
You can always steal 4 of the front timing cover bolts as the short bolts (THEY ARE THE SHORT BOLTS) and replace them later (or cut the long bolts off and use them in the front cover or used thick spacers).
There are many way to get the job done.
bob gauff
You can always steal 4 of the front timing cover bolts as the short bolts (THEY ARE THE SHORT BOLTS) and replace them later (or cut the long bolts off and use them in the front cover or used thick spacers).
There are many way to get the job done.
bob gauff
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