Raynay

Hi there, so I recently did head gaskets on a 2007 Silverado 2500hd, 6.0 Gas due to a failed head gasket on cyl 6. *410,000kms*
I’ve replaced gaskets, bolts, lifters, pushrods and new springs.
engine fires up and runs absolutely perfect, no codes and has 40lbs (275kpa) of oil pressure.

My issue is I have no oil coming out of the pushrods/top end.
The lifters were submerged in oil for 24hrs previous to instal.
everything has been cleaned and hot tanked, pre lube was used on all metal/metal joins.

im curious because I have confirmed good oil pressure at the sending unit but no oil from the lifters or coming up the pushrods.

has anyone else had this issue?
thanks!

Che70velle

iTrader: (6)

I’m guessing here that you’ve pulled the valve covers and verified that there is no oil at idle or revving it? Since the lifters direct oil up top, and you changed them out, that’s where I’d start. What lifter did you purchase and from what vendor? You soaked the lifters in oil, but did you clean the thick rust preventative out of them? It’s awful and if it’s been in long enough, it will harden. How did you setup lifter preload? Did this engine have DOD?

Raynay

Yes I have ran it both at idle and up to 2800rpm with both valve covers off and no oil cooking out of any pushrods on both sides of the engine.
the lifters are a BTR Delphi ls7 lifter that I got with matching pushrods and springs from Lordco (local parts distributor) as well a new stock camshaft (old one showed lots of pitting) cam bearings looked good so they stayed
lifter preload was set at 50 thousandths
and each rocker was torqued to 25ftlbs on the base lobe of the cam
i did not inspect for the rust hardening inside the lifter but they did sit in warm oil for 24 hrs previous
its a non DOD engine


sounds exactly like a 6.5 diesel when it runs

Che70velle

iTrader: (6)

Sounds like lifters aren’t oiling correctly from your description of the diesel sound.

Raynay

So I have purchased a new set of Melling OEM lifters,, soaked them in solvent and confirmed all of the rust preventative has been cleaned out.
soaked in new oil and primed.
re installed heads and set lifter pre-load.
fired up and have exactly same issue.
The camshaft and lifter rollers are saturated in oil but the top of the lifters and pushrods are all dry.

im wondering if there is anyway I can apply air pressure to see if the oil port is clogged or to confirm the passage is clear

pretty close to dropping in a junkyard 6.0 and making this one a boat anchor

ls3fox

Did you make sure the pushrods are cleaned out

Raynay

Yes pushrods are brand new and confirmed free passage way on all of them

Old Buzzard

You bought a "kit".
So, just how did you: "lifter preload was set at 50 thousandths"?

1988montecarloss

iTrader: (6)

pushrod length correct?