Help, Cam / lifter change 4 miles truck stops

[rod7515]

Can someone explain the cam phazer and how it works Or give me a place to get information on them. Can they go bad? How can i check mine?
I checked compression in cylinders 1, 3, 2, 4, 6. All at zero. So I pulled the front cover off this morning Timing chain, guide and tensioner all in place. I put the crank bolt back in then turned over the motor. Went about 1-1.5 turns and I felt a positive stop and crankshaft wouldn’t turn any more. Tried again but wouldn’t go. turned crank backwards 1/8 turn then forward and it went. Then about 3/4 turn more and it stops. wont go forward. This time as I turn back not even a 1/8 turn I see the pin in the phaser clockspring change position. When I go forward I see the clockspring tighten but cam bolt didn’t move at first so I think something is wrong in the phaser operation?

it’s a brand new Melling OEM replacement. When I was putting it together the first time I was told i Didn’t need to do anything except line it up with the cam pin and bolt hole. Could it be defective?
Now I’m sure I have bent valves. Has anyone ever dealt with Melling on a defective part?
‘what else could it be? Am I on the right track?
Thanks Rod

 

[rod7515]

Anyone have any thoughts on this?
Rod

 

[jws123]

I am not sure about the cam phaser causing this however something for sure happened if your having compression issues and verify all rockers/valves move at a minumum you need to rip the heads off see how many bent valves you have.

 

[rod7515]

Definately the heads are going to have to come off. The question is how does the phaser operate? is it controlled by oil pressure and is the hellcat pump causing it to advance to far causing valves to hit or did I just get a defective phaser? I guess I need to call the Melling Corp and see what their thinking is. I am sure no matter what they wont stand behind valve replacement. Im sure they will replace the phaser itself but I need to know why and what caused this failure. The machine shop said they will tuen the heads around in 1 day once they have the heads and new valves. Hoping to get some answers. I purchased a used Yukon today to tow my mowers each day until I get this resolved. I cant believe I now own a GM product. Ugh!
Rod

 

[jws123]

The phaser is controlled by oil pressure via the vvt solenoid sits right under the intake manifold your oil pump shouldnt have caused a issue have seen plenty of people run non stock oil pumps. What I dont know is lets say the cam phaser failed would it let the timing change enough to bend valves? that part I have No idea. Hopefully someone else chimes in I have never personally had a timing issue on these motors its prty straight foward have rebuilt quite a few.

 

[Yardbird]

I would pull the phaser and crank pulley and check to make sure one of the keys hasn't sheared or bent.

I don't know if the Hemi had a keyway or pin on the cam, but I once did have a cam bolt back slightly loose, and the dowel pin slipped out enough to throw the timing off to where it bent an intake valve.

 

[Lee Peterson]

The hellcat oil pump shouldn't have hurt anything lots of guys running that mod, the phaser when maxed out shouldn't cause piston to valve contact unless you have a performance cam. The cam pin most likely sheard from improper torque on bolt or the timing was off a tooth.

 

[rod7515]

I didn’t have any time this past week to remove the heads. I plan on getting them off in the next 2-3 days. Then I will remove the hellcat pump and check the timing marks on crank and cam before removing the chain assembly. My concern is what caused this? Why did it run for 25 minutes in driveway then go 4 miles before this happened. once the heads are off and I verify the chain and gears I will talk with tech support from melling. Hopefully they can give me some answers if I haven’t found anything by then.
‘here’s another question. can the weight of the oil make any difference in the operation of the vvt solenoid or phaser?
thanks Rod

 

[rod7515]

Pulled the heads today. Every valve, intake and exhaust on both heads have a mark on them from touching the pistons. I took heads to machine shop to be redone. He said if they touched they will probably be bent.
I turned the engine over until timing chain and gears were matched up again. They are still in time. Top gear at 12 o’clock with double mark in chain on both sides of phaser mark and lower gear with mark on chain on tooth with mark. I knew that’s what I would find.
so that means the only possible problem is either the phaser or VVT solenoid.
is there any relearn procedure for the pcm when the phaser is replaced?
I called summit because I bought everything from them except the VVT solenoid. That came from federated. They are telling me I need to call Melling since it’s their phaser and get an RMA to return parts to them. So tomorrow I’ll be on the phone with melling.
im interested in figuring out what went wrong so I dont have this issue again.
‘please give me any knowledge you may have. These heads will be expensive to repair and I don’t want to do them again.
Thanks Rodney

 

[DILLIGAF]

There's literally a MMX YouTube video with steps by steps. The only way to screw these HEMIs up is not following it.