Intake Rocker Arm

[Sneaklylilpetey]

Valves look fine, can't see anything wrong with the valve seat. Piston looks brand new

 

[DonFitzwater]

I stand the heads on their side and spray brake clean into the valve pocket to see how bad the seal is.........It's gonna be bent just enough!

 

[Sneaklylilpetey]

On a side note. I raptor lined the truck in basalt gray.

 

[Ozymandias]

After you adjusted that valve to proper clearance, how long did you run the engine?
Did it have a chance to burn up all kinds of deposits around the valve and its seat to seal again?

 

[Sneaklylilpetey]

After you adjusted that valve to proper clearance, how long did you run the engine?
Did it have a chance to burn up all kinds of deposits around the valve and its seat to seal again?

I wasn't able to drive it around because I had the bumpers off for paint. I let it get up to operating temp and took it up and down my long driveway, so probably not long enough to burn any crap off. Hopefully I hear back from the shop sometime today

 

[Sneaklylilpetey]

Shop got back to me yesterday, It's a bent valve

 

[Sneaklylilpetey]

Got the head installed today and I'm in the process of setting valve lash when I torqued the rocker arms I made sure to back off the lash adjustment a bit to not over torque anything.
With all rockers set to 27 ft pounds I turned the engine over to TDC (mark at 12 o'clock)
Got everything set for lash and rotated the crank 9 times and checked lash again.
I'm noticing that at TDC the #4 exhaust and #5 intake have lash in them, meaning I can wiggle the rocker arms. At TDC 1,2,4 intake and 1,3,5 exhaust should have lash in them. If I crank the engine over another 360 degrees, 4 exhaust and 5 intake have lash and I verified that it's .010 and .020. it's my understanding that 4 exhaust and 5 intake rockers should be under tension at TDC and have no lash in them.
What am I doing wrong here?

 

[petersonj]

At TDC 1,2,4 intake and 1,3,5 exhaust should have lash in them.

This means that "4 exhaust and 5 intake" should not have lash.

If I crank the engine over another 360 degrees, 4 exhaust and 5 intake have lash and I verified that it's .010 and .020.

This means that "4 exhaust and 5 intake" should have lash. I am just using your numbers (not verifying with the FSM), but it sounds to me that everything is normal assuming that the .010 is intake and the .020 is exhaust. Or, I am misunderstanding what you are saying.

- John[/QUOTE]

 

[Sneaklylilpetey]

This means that "4 exhaust and 5 intake" should not have lash.



This means that "4 exhaust and 5 intake" should have lash. I am just using your numbers (not verifying with the FSM), but it sounds to me that everything is normal assuming that the .010 is intake and the .020 is exhaust. Or, I am misunderstanding what you are saying.

- John

[/QUOTE]

When I put it at #1 TDC. 4 and 5 has a slight amount of lash. I did some reading and I guess that's normal considering the position of the pistons.
I'm just being very cautious. I don't want another bent valve

 

[petersonj]

I'm just being very cautious. I don't want another bent valve

I completely understand.

- John

 

[sag2]

Just thinking out loud, but one thing that could have happened is the rockers were mixed up in reassembly. If the engine was at TDC when the rockers were installed, and the adjuster was too tight, the valve could have contacted the piston when you torqued down the rocker and bent the valve and ruined the pushrod. When I reassemble anything I always back the crank off 30-45° from TDC when installing the valve train (or cams on OHC) so the valves cannot hit any piston. Then carefully rotate the engine over by hand (no compression) and check for anything binding. From the look of that pushrod, something really bottomed out on assembly, or the rocker/valve was stuck and it hit the piston hard. I'm assuming you have checked all the other pushrods to make sure no others were bent?

 

[Sneaklylilpetey]

I completely understand.

- John

I even removed the #1 injector to make sure piston was at TDC lol

 

[Sneaklylilpetey]

Got her all back together and she's running like a well oiled beast.
Thanks for all the help in here!

 

[Ozymandias]

You did it right, there is no need to turn the crankshaft nine times to set valve lash, one 360° is enough to set all valves.