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Why are there so many loose bolts on my cadillac engine?
2008 Cadillac DTS

Why are there so many loose bolts on my Cadillac engine?

(2008 Cadillac DTS)
2008 Cadillac DTS 4.6 northstar. Loose bolts everywhere! Plenum, valve covers, and timing chain cover. Now that I get into it the timing gear above oil pump is damn near falling off. Why does this engine seem so poorly put together and is there any fix? Slop all over in timing chains. Was making a tick/knock sound the dealer told me was Rod knock. I’m leaning more towards a timing chain slap given how much play there is. Car ran fine but the embarrassing noise made me investigate. Glad I did. Any help?
What seems to make the problem better or worse? Noise louder with acceleration
How long have you had this problem? Slowly progressed over about 1 year
Tags: cadillac, dts, timing
1 answer & 0 comments
Popular Answer
on April 12, 2019
Concerns about "loose bolts everywhere" would be alarming on a brand new, never serviced vehicle with less than 10,000 miles. On an 11 year old vehicle with unknown service repair history -- it's best to focus on your concerns rather than the indication of loose bolts found. Also, torque specifications for fasteners will vary -- make sure as you reassemble you are using a torque wrench and following manufacturer specifications. It is far more concerning about the internal engine noise -- certainly, repair what you find to be suspect, but you could still have a "rod knock" once you get the engine back together again.

It's hard to know much without tear down and inspection, but your dealer technician would have some "pattern failure" experience and first hand knowledge of these engines that may prove to be accurate at some point.
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on April 12, 2019
Concerns about "loose bolts everywhere" would be alarming on a brand new, never serviced vehicle with less than 10,000 miles. On an 11 year old vehicle with unknown service repair history -- it's best to focus on your concerns rather than the indication of loose bolts found. Also, torque specifications for fasteners will vary -- make sure as you reassemble you are using a torque wrench and following manufacturer specifications. It is far more concerning about the internal engine noise -- certainly, repair what you find to be suspect, but you could still have a "rod knock" once you get the engine back together again.

It's hard to know much without tear down and inspection, but your dealer technician would have some "pattern failure" experience and first hand knowledge of these engines that may prove to be accurate at some point.
Sign in to reply

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