customblackbird

iTrader: (2)

Just aligned my new GMPP HV oil pump on my 150k 5.3 and did a custom cam and new timing set.

I read and watched videos on how to align the pump and it's not difficult I used 3 sets of feeler gauges but it seems tight to me.

I got .002" on the outside of the gear to the housing and .005" between the inner gear and crank gear. Does that sound about right? From what I've seen it's more like .003 and .006 or something else. I also used thick permatex engine assembly lube when setting it up as I'm not going to start the motor for at least another 4months.

brandon6.0

iTrader: (32)

A lot of people don't even bother with trying to line them up. I usually just bolt them on and go but I do try and center it up. U are supposed to use 3 .003 gauges going around the outer gear between the pump housing. This makes where the gears are lined up when ever u bolt the pump housing down to the block.

mOtOrHeAd MiKe

iTrader: (8)

Doesn't matter. Do what makes you feel best and move on.

customblackbird

iTrader: (2)

Thanks. I couldn't get the .003 in between the gears and housing, so I dropped to .025 and then .002 was the only one I could get all 3 in.

Launch

I never do this. Never had an issue

07NBSChevy

iTrader: (1)

Stock Pumps really do not need alignment. Just put it on, turn the crank 360 degrees , then tighten it down.

Even with my Melling 10295 Pump, I could barely get .002 feeler gauges in, I had to forcefully shove them in between. I got it close then tightened it down.

pantera_efi

iTrader: (1)

Hi, I too agree with the above reports.

The "art" here is to CENTER the G-Rotors inside the pump housing with respect to crankshaft center.

The OEM pumps use Rubber Washers around the mounting bolt threads.

A good thought would be to fit a rubber O-Ring if they were not found.

Lance

customblackbird

iTrader: (2)

No orings on my stock 99 pump.

if you use the feeler gauges then you don't need to rotated the motor right?

MY_2K_Z

iTrader: (1)

Just bolt it down and be done please.

customblackbird

iTrader: (2)

Haha it's been done. Already finished the cam and timing set install, front cover, oil pan, morel lifters and ls2 trays.

Jusr wanted To make sure it was good before putting the engine back in.