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cts
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114 Posts
Discussion Starter #1
So the top area of my motor is sounding a bit rattly an I think I need a valve adjustment has any one had it done to there car? An know a ball park price on getting it done?
 

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Im thinking about doing mine too. Or at least measuring them to make sure there still in spec. It would be nice if someone has done it. Ill look it up on alldata tmr for you should atleast have the valve clearance
 

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2006 CTS sport model/package
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1,058 Posts
Aren't they hydraulic lifters on these motors? Hydro lifters 99 times out of 100 don't need to be adjusted.
 

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CTS
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There is no valve adjustment.....if your valve train is noisy there are deeper issues. Make sure it is not the injectors your hearing (DI injectors are very loud).

How many miles on the motor? Ever run oil low? have you always run full synthetic? (timing chain issues).
 

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cts
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Discussion Starter #7
Its the 3.6l 94k an as far as I know never ran low an full synthetic but iv only had the car since 87k

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It sounds like my lifters or retainers are loose or something I can hear it really good from the drivers side of the motor

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I dont know what really it is tho my honda sounded like that an I had them adjusted an the sound went away so thats what I was using for a reference
 

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CTS
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You may have a worn follower. Remove the valve cover and with the cam lobe facing up feel each for excess play. Your also due for a timing chain replacement to avoid jumped timing.

:thumbsup:
 

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2006 STS V8 1SF RWD
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6,479 Posts
SC2150 said:
You may have a worn follower. Remove the valve cover and with the cam lobe facing up feel each for excess play. Your also due for a timing chain replacement to avoid jumped timing.

:thumbsup:
Due for a timing chain replacement? Isn't the chain supposed to be fine for the life of the motor? Unless it develops slack or snaps.
 

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Cadillac Owners Member
CTS, 1st gen.
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2 Posts
Are there any codes associated with timing showing up? because when the timing chains stretch, the tensioners fail, or the chain guides wear these can change the timing causing the valves to be slightly touch the pistons and overtime can break your valves. The 3.6 liter engine has quite problems with timing chains. There is no valve adjustments that can be done to this model of heads.

(This thread is dead for 4 years)
 

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04 CTS 91 Aristo
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446 Posts
Yes you will get a CEL once the timing chain is stretched far enough. I don't remember what it is but it seems to show up when the timing chains are far past just being noisy. You should probably just change the timing chains and not wait for a code to show up or the chains to break.
 

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2006 CTS 3.6 and 2008 STS N* 1SE
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57 Posts
I have this engine rattling issue and I guessed it had something to do with the initial oil pressure not being high enough until the car ran for a couple minutes and the sound mellowed out. Now it intermittenly does it (rattles) all the time which leads me to believe the oil pressure is bouncing and I guess maybe the chain has stretched. It would seem that with all the "timing chain and tensioner" replacements that may only be half the fix and not the cause of the issue. I thought the oil filter being on top of the motor was so cool but now I'm starting to think their is a flaw somewhere in this design.

At this point I'm suggesting to my wife that we trade the car in since we have no definative diagnosis and a resolution for this issue. It really sucks though because the 3.6 VVT is a nice motor. I'm open to listen to anyone that's resolved this issue.

Thanks,

Will
 
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