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2007 cadillac dts 4.6 y

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No need to be worried just yet. When I fixed some burned exhaust valves on my 1993 STS I used Time-Serts because a lot of the thread material came out with the bolts. No bolts were loose I might add. Some believe that the threads give up and causes the gaskets to blow. I believe the other way round. The gasket gives up and with enough time maybe a thread or two gives up because of excessive movement and forces in the area of the failed gasket.That phenomenom would show itself with bolts so loose that you hardly have to turn them loose which is hard to separate from the fact that they all require litte effort to loose even when they are clamping as they are supposed to do. Long story short, I don't believe that there are many cases where the bolts actually has loosened themselves. I believe the most damage done to the threads is when you loosen them. In your case the original threads may be fine enough to be used as is. How was the old bolts looking? Nice and clean or gunked with aluminium debris?

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It looks good,  I can even say very nice. On the threads was  only rest of sealant. I change them  becouse mechanik i asked too said that bolts should be new. Reason is that bolts become a bit longer during the time work engine.

I will report when I see something wrong.

   

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Jan - Kris has not pulled the heads.  He pulled the idler wheel mount for the cam chain idler on the front of the engine.  Apparently previous work had not tightened these bolts properly and they had worked loose, to the point that the cam chain idler jammed and locked up the cam chain, which ripped the idler mount off the front of the block.

Kris:  The Timesert inserts are for the bottoms of the head bolt holes.  The factory uses threads directly in the aluminum, with threadlock and sealant that makes the head bolts hard to break loose to remove the heads.  Usually the aluminum threads are not re-usable.  GM recommends Timsert steel inserts for the head bolt holes.  Once these steel inserts are in place, you can re-use them if the heads need to be removed.  The stock head bolts work with these inserts.  You still should use new head bolts when you put the heads back on the block.


CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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 I have seen timeserts as way to fix damaged Bolt holes, but fixing engine was my first time that why I can believe everyone in everything. With all respect for Jan.

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On Wednesday, August 31, 2016 at 0:50 AM, Kris Poland said:

Hi!

It take a while, but at least engine work (hope that for long years :) )

After disassembly heads it turned out that only 4 exhaust valves and 2 intake was bent.

So, I did like I said before, drill new hols in place of old one, make new thread M8.

// I think, if I was first, that means, that orginal M6 is strongly enough. That why M8.//

Head was totally repaired, valves, gaskets, lifters, etc...

Mount new timming set and idler sprocket.

And engine WORKS!!! Already about 5 hours. IM PROUD FROM MY,  becouse I did It by my self.

 

 

@Cadillac Jim, Kris said this on the prior page.  He undoubtedly had the heads off.


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Sorry, I forgot.  Too much multiasking.


CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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39 minutes ago, Jan Olsson said:

Multiasking? I guess that's one kind of multitasking ;)

 

Multitasking, like, doing other things besides forums and the computer.


CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Like when female drivers uses their cellphones, eats their breakfast and are doing their makeup while ignoring the right hand rule through the entire little town where I live :)

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I myself get confused sometimes between multiple threads sometimes and forget prior details.


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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My multiple threads involve my presence in multiple locations.


CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Hi everyone!

After 6k mil hard knocking noise  forced me to disasemby timing case and camshaft case. 

It turned out that  timing chain tensioner not hold the chain. I buy new timing set before and that new was broken. 

So that is worning for everyone do not trust new parts. 

I report that there is no licking oil under the head.

Engine working fine, except one worning "camshaft sensor bank 1" code p340 and 341. That code become 3kmil ago. I buy new sensor but nothing change. Is it possible that engine computer is bad?

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Are the tensioners ac delco or from a cheapo kit from ebay. I have had a motor delevered to me with bent valves in the back from a prior rebuild and they used the cheapo timing chain kit from ebay and the tensioner failed causing the valves to bend. Get time Timing components from Rockauto.

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I buy it From Rockauto.  For my lucky i make rection when I hear first noise. Proably that why nothing else was happend.

Edited by Kris Poland

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17 minutes ago, Bruce Nunnally said:

Is there a specific brand of timing chain components that is preferable?

AC Delco.


Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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No, it wasn't AC Delco, I buy only avalivable: CLOYES.

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I know this is a long time after the last post buy I wouldn't hesitate to use Cloyes.  I wouldn't be surprised if they were the original equipment manufacturer

Are you telling me a Cloyes tensioner failed? 

@Kris Poland


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I  have 2007 dts 4.6 timing idler pulley  bolts loosened up top one head broke off fell into the crankshaft timing chain broke the chain bent the intake valves where can I buy a new set of valves for around one hundred dollars i have looked and can not find them 

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Hello. Welcome to CaddyInfo.

Please use periods. Runon sentences mess with me. 

I am sure Barczy will chime in here. He is amazing when it comes to this engine.

Did you check Rockauto?


GM FAN FOREVER

Nice, clean, luxury= fine automobile

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