Valve Adjustment Frequency
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,920
Received 10,979 Likes
on
7,211 Posts
They are seldom adjusted.
Not sure if this is because the clearances are seldom checked, or because adjustment is seldom needed, or because the actual job of adjusting them is a royal PITA.
*Checking the clearances* is easy, though, so you could do so to satisfy your curiosity if nothing else.
Cheers
DD
Not sure if this is because the clearances are seldom checked, or because adjustment is seldom needed, or because the actual job of adjusting them is a royal PITA.
*Checking the clearances* is easy, though, so you could do so to satisfy your curiosity if nothing else.
Cheers
DD
#3
#4
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 6,796
Received 2,399 Likes
on
1,880 Posts
No experience with the valves on this engine. But, some in other
non hydraulic lifter engines. It is a metal to metal thing. Most, if not all engines in this design live out their useful lives sans valve lash adjustment.
Caveat; That is assuming no abuse.
Very early engines had no means of setting lash other than removing metal. Good for the life of the engine. But, in that era, 100,000 miles was a minor miracle.
The only "weak spot", if indeed it is that I might consider is the "shim" method to set the initial "lash". Are they as long lived as
lifter material, cam lobes, and valve stems??? I don't know.
Carl
non hydraulic lifter engines. It is a metal to metal thing. Most, if not all engines in this design live out their useful lives sans valve lash adjustment.
Caveat; That is assuming no abuse.
Very early engines had no means of setting lash other than removing metal. Good for the life of the engine. But, in that era, 100,000 miles was a minor miracle.
The only "weak spot", if indeed it is that I might consider is the "shim" method to set the initial "lash". Are they as long lived as
lifter material, cam lobes, and valve stems??? I don't know.
Carl
#5
#6
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,920
Received 10,979 Likes
on
7,211 Posts
Yeah, I've never seen valve adjustment on any of the 'routine service interval' charts.
Interestingly, re-torqueing the head bolts is recommended every 12000 miles....except for North American market cars where that recommendation is absent, along with a few others !
Cheers
DD
#7
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 6,796
Received 2,399 Likes
on
1,880 Posts
As to us:
1. Lower compression in USA bound cars? I dunno, if so, keeping the squeeze on not so problematical.
2. they figured that most of us ain't gonna do it anyway...
3. The guys/gals that lease/buy a new Jaguar are not going to keep it over a couple of years...
4. No 100,000 mile warranty to concern Jaguar. I don't know.
Carl
1. Lower compression in USA bound cars? I dunno, if so, keeping the squeeze on not so problematical.
2. they figured that most of us ain't gonna do it anyway...
3. The guys/gals that lease/buy a new Jaguar are not going to keep it over a couple of years...
4. No 100,000 mile warranty to concern Jaguar. I don't know.
Carl
Trending Topics
#8
Join Date: Oct 2009
Location: Perth Ontario Canada
Posts: 11,058
Received 2,266 Likes
on
1,845 Posts
Thread
Thread Starter
Forum
Replies
Last Post
JimC64
XK8 / XKR ( X100 )
189
12-29-2015 06:41 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)