Seized Engine!

[f5fstop]

Originally posted by Jim Williams:
Got it back yesterday. Here's the story:
0 psi compression on all cylinders. Removed cam shaft, intake camshaft bolt loose and locating pin sheared off causing gear to turn on cam. Valves OK. Replaced intake camshaft, gear and bolt, also replaced exhaust cam gear.
After roadtest, vehicle would not start. No fuel pressure. Fuel pump relay found loose terminal in underhood electrical center. Replaced block.
I also had a no start out in the Borrego Desert last winter. The neg. battery terminal was loose so I tightend it on the spot, good to go. Sounds like a bit of poor assembly here, maybe it's a Monday car.
Now I'm back to my third engine break in period.

Pray for me.

The initial cylinder head problem was GM's problem and hopefully that has been fixed.
However, from what you have said, the technician did one of two things in regard to the camshaft, and I will assume number one is the real cause.
1. The cam gear to camshaft requires a NEW torque-to-yield bolt, the old bolt cannot be used once it has been torqued. So, I would bet a lunch, they installed the old bolt, torqued it, and it lost torque due to the threads already stretched to their max.
2. He didn't torque the bolt as specified, it came lose, and bingo, gear spins with chain.
The electrical problems can be related to this technician too. It is recommended to remove the fuse block to gain access to many items that are removed to service the head. He could have banged it around a bit too much breaking the terminal.
Intake manifold is plastic. Over torquing, either with a torque wrench or power tool, will crack. That is why the service procedures tell them to tighten, then torque with a torque wrench. If they don't, it can crack or warp.

Can't pray for you, since I don't believe in it, but I sure hope that everything is ok. If not, and I was you, I would jump into Hummers **** so bad, demand a new engine or a new vehicle, and I would NEVER allow anyone in that dealer to touch anything, including adding air to a tire.

Sounds to me like the technician was sloppy, hurried the job, doesn't understand torque-to-yield bolt usage, and needs to see if Walmart is hiring greeters.