Fred Tx

Just installed a new motor 5.3l in an 01 p/u. I installed a lunati cam with brand new g.m. lifters. Started the engine and noticed at approx 1200 rpm and higher i get a lifter tick.At idle you cant hear it. Thought it might be a pushrod or rocker (both stock g.m.) so i replaced all on the pass/side. That didnt help. One thing i noticed when you look down the pushrod hole at the first 2 lifters on the pass front side,they look dry.All others on that bank appear to be oiling fine..Anybody help figure this one out?

Fred Tx

anybody out there gunna take a shot at helping me to figure out whats wrong.I'm going to replace the liters although they have 500 miles on them just to be sure.Just wondering why the first 2 lifters arent getting oil???

mred

iTrader: (5)

oil pump o ring

fauslpss

iTrader: (6)

^^^ did you replace that. If you didnt that is probably the culprit.

Fred Tx

No I did replace the o-ring when I rebuilt the motor. Today I pulled the r/s head and replaced all the lifters on that side. Couldn't find anything wrong with the first set of lifters but replace them just to be sure. Well as my luck would have it......same ticking. Could it be a cam bearing installed wrong?
I use a well known machine shop here in houston that i have used in the past without any problems. I just dont believe its the oil pump oring.It sounds like the front 2 lifters are being starved of oil. Please i need some of you experts on here to give a brother some advise.

Justin93

iTrader: (7)

Are you sure that the Oring was seated correctly into the oil pump?

Fred Tx

I would say im 99% sure it is installed correctly,but is this what it sounds like it might be? Im almost to the point to install a zipper lol. It would make tear-downs a whole lot easier. Should i pull the pan next? Can i remove it without pulling the engine? 2001 silverado 5.3l

fauslpss

iTrader: (6)

Just drop the front of the pan to get to it, you can do it with it still in the car.

98Camarod

iTrader: (43)

Did you check your pushrod length? You said they are stock, I'm betting that's the reason for the ticking. Get a 20 dollar pushrod length checker and check it out.

Fred Tx

what am i checking for? What length are stock and what length should they be?the cam is a lunati 212/221 @ .050 510 lift. flowtech shorties.(no there not leaking) stock valve springs (per lunati) and stock length p/r. I only hear ticking on the rf cylinder.

98Camarod

iTrader: (43)

The cam is larger, therefore the valvetrain geometry is not the same. Also I wouldn't want to run stock springs on any aftermarket cam, even a small cam like the one you have.

Fred Tx

could the oil pump oring be bad a still maintain 45 lbs at idle and 55-60 at speed?

98Camarod

iTrader: (43)

Highly doubt it

Justin93

iTrader: (7)

if the vehicle has been running at full operating temp and is still at 45lbs Idle then I doubt its your Oring. Mine usually Was sitting at 45 to 50 at idle when it first reached operating temp and then slowly dropped off to 20-25 PSI the longer the motor was run at full temp as the oil would thin out, seep through the Oring, and suck air into the pickup. Im thinking you need a pushrod checker to make sure the Geometry is correct as stated above.

Fred Tx

FOUND THE PROBLEM.........wrist-pin.. #2 cylinder....time for a stroker.Here we go again.stop me i'm outta control.
Thanks guys for all your advice. hope i can return the favor.

98Camarod

iTrader: (43)

Ouch, good luck