Jump to content

Screw in cylinder disaster

6TEEN5.3

By 6TEEN5.3
in Troubleshooting & Recalls

 Share

Recommended Posts

6TEEN5.3 Enthusiast

6TEEN5.3

Posted
Posted

Hello everyone! Does anyone have an idea how a screw from the MAF sensor could have ended up in cylinder #1? I towed my truck to the dealer after it started knocking badly. Techs found a screw inside the engine and found that the MAF sensor is missing one. Needless to say, the 5.3 is done and at 70k miles I’m out of GM warranty. Extended warranty refuses to replace the engine since it was a “foreign object” that caused the issue. Dealer quoted me at roughly $12k between parts and labor for the replacement. Has anyone experienced or heard of anything similar?  I’m currently seeking legal help to take further action with the extended warranty company. 
 

 

EA4C92C7-96B8-485E-8CE7-51DAF3A763E5.jpeg

9B6E3AA8-CFB5-49F1-A813-435E9CC7E1E5.jpeg

3B1A72EE-0F94-4B06-9E5C-BD4521485617.jpeg

silveradosid Senior Enthusiast

silveradosid

Posted
Posted

do you have the stock intake system on your truck, a screw that size would have got trapped in one of the corrugations of the stock system. next would be find an independent shop. the knock is probably a jammed lifter from the screw hitting the valves. if the cylinder isnt scarred and the cam is ok, piston and rings, lifters and pushrods and a new head and put it back together

6TEEN5.3 Enthusiast

6TEEN5.3

Posted
  • Author
Posted
18 hours ago, silveradosid said:

do you have the stock intake system on your truck, a screw that size would have got trapped in one of the corrugations of the stock system. next would be find an independent shop. the knock is probably a jammed lifter from the screw hitting the valves. if the cylinder isnt scarred and the cam is ok, piston and rings, lifters and pushrods and a new head and put it back together

Yes it has the stock air intake. I should mention the truck was rear ended pretty hard which I think had something to do with it. It wasn’t hard enough to bend the frame but it did break the driver seat bracket. I sent pictures and a video of the knocking to a couple different shops and both said it needs a replacement. 

  • 1 month later...
6TEEN5.3 Enthusiast

6TEEN5.3

Posted
  • Author
Posted
On 7/9/2021 at 11:38 PM, CrawlSlow said:

If you can prove it was due to the accident, I'm sure your car insurance will cover it.

Couldn’t prove it and the fine print says they don’t cover stuff like this. Paid out of pocket for a new engine. 

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Thanks - I wasn't quite caffeinated this morning. 2:1 makes sense, turning the crankshaft 360 degrees will turn the cam 180 degrees, and had I done that, the cam's dot would be at 6 and the crank's at 12 again.   I went ahead and took the sprocket off anyway, aligned everything dot-to-dot including the balance shaft just for s&g. I'm glad I did because I discovered no Loctite on the timing sprocket bolts. Maybe it's not required, but at only 20 ft-lb torque spec, those bolts aren't in there very tight. Cleaned and reassembled with some thread locker and torqued.   A general observation: Less is more with RTV. If a little doesn't stop a leak, a LOT probably won't, either. RTV is thinly veiled revenge, in a tube...      
    • richard wysong
      Wow I'm in a pickle. (Broke down truck) and a story.

      By richard wysong · Posted

      The timing marks are ok, that is #1, you can turn it over until they line up and it won't change anything, the crankshaft turns twice for every camshaft revolution, I have always set up SB Chevs as your pic shows using a straight edge
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Someone's been here before.... There is a receipt for a 3-piece timing set, purchased earlier this year.   Is this picture something, or, nothing?   I have the timing cover off and my crank is perfectly TDC and the keyed gear's locating mark is dead on 12 o'clock.   The cam gear locating mark is also at 12 o'clock. Now, I'm not an expert, but all the install guides say the two locating marks should meet and be perfectly aligned when installing a timing set. The mark on the crank should be dead on 12:00 and the cam gear's mark should be dead on 6:00, and both marks should be perfectly vertically aligned.   I believe the timing gear is keyed or has a dowel that ensures it can only be installed on the cam in one position, so I have to believe the cam is out of phase somehow. At the very least, with a triangular bolt pattern, it can only be installed in one of 3 different positions.   Before I pulled the front cover, the truck was running alright, no service engine soon lights except an occasional P0172 / rich condition. Timing -16 timing at idle (should be +16), and total -35% fuel trim, two conditions I haven't been able to figure out.   In related news, my injector tested pretty well, wasn't leaking, but I had it rebuilt anyway, and it's on it's way back to me.         Along with this discovery, the good and bad:   Good: The oil pan seal appears undamaged.   Bad: -The timing cover has been reused, and the positioning dowels have been broken. That could explain some of the leaking. -Some kind of white paste or grease was used to try to seal the oil pan seal and timing cover (since wiped off..). -Then, someone globbed silicone all over the front of the cover and also buried the ckp sensor in it. But, they didn't put any inside the cover or use RTV to try to seal the oil pan seal with the timing cover (good).
    • Grumpy Bear
      PF63 Oil Filters Going Away?

      By Grumpy Bear · Posted

      The guy that owns K&P filters last I checked in with him has over 300,000 miles on his Dodge base Hemi using his own 35 micron absolute stainless mesh filter from its first oil change.    The GM study I've posted a dozen times shows the relationship in engine life based in multiples of base units, not miles or years. That is the base unit is the number of miles the motor ran using the reference filter efficiency.    The above two paragraphs dismantle anecdotal arguments IF one changes oil often enough to prevent particle formation and the motor is in otherwise good shape. That is not full of silica (no air filter) or suffering a metallurgical issue that is not part of the lubrication discussion. Poor heat treat in example.   Data from UOA's I've reviewed from more than a few engines can show remarkably broad variations in oil cleanliness using the exact same filter over the course of an engines life.     Lastly there is the common sense of it. Wear debris WILL circulate the engine BEFORE it ever sees a filter in route to that filter and WILL harm the pump which NEVER sees filtered oil.    Alpha question then becomes, given the facts, how long do you believe is a reasonable service life from a vehicle you are certain you will not pass down? That is the junk yard will be it's resting place when you're done with it? (the moral issue most don't care about).    Omega question is then how diligent are you prepared to be in general mechanical, air & oil maintenance? Preventing particulates and keeping them sufficiently dilute; preventing the precursors from generation, amalgamation and precipitation.    If I get a good look at the engine bay of a vehicle I have a fair idea of the owners commitment to the inside of the power train. That 30 micron WIX is still more efficient than a sieve.                 
    • Tyler Gibbs
      PF63 Oil Filters Going Away?

      By Tyler Gibbs · Posted

      It also depends on what criteria someone is using for “best” when talking filters.  Are we going off best efficiency?   Best quality/QC?  Etc. because the two may not mutually exclusive.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...