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Upper Head Lubrication
10-22-2013, 09:02 PM (This post was last modified: 10-22-2013 09:24 PM by cferry7.)
Post: #1
Upper Head Lubrication
1995 GMC Jimmy 4.3 L Vortek

Priming new Remanufactured Long Block.
See no oil splash up to upper head, yet Oil Pressure Guage at
normal Oil pressure sensor fitting measured 45 -50 psi.
Priming the Oil System with a Electric Drill and Pre-lube Oil Pump Tool 2x's with
Front Chassis Lifted wheels 2 inches ground clearance. 2 x's same with
Wheels on the Ground.
Remanufactured Eng. Tech suggested my portable drill only
like 1400 rpm which is not high enough RPM on Pre-lube Oil Pump Tool
to bring Oil to upper head - valve guides , rockers. It should
be OK when Engine is started their suggestion. Yet, oil pressure
is reaching top end due to guage reading.

Priming Oil System with Starter / Distributor installed with Chassis Lifted - same -
I do not see the Upper Heads getting oil splash.
Oil flow should be up through the push rods ?
I may have covered the holes in push rods with Assy. Lube.
Was duration of Priming ( 1.5 minutes max at a time ) too short to see effect ?
Could this be because Chassis is Lifted ? Other ?
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10-22-2013, 11:17 PM
Post: #2
RE: Upper Head Lubrication
99% sure you will be ok once it fires up and gets warm. See, the assembly lube will melt with temp and I bet you have that all over the place. The assembly lube will also wash away and disolve with the detergents in the oil as it circulates. The other thing going on right now is the oil can't get to all the pieces up top because it must travel through the lifters then up the push rods, but with the engine stationary all of the lube holes in the various bores may not be lined up to allow it. What I would do is fire it up and look after 2-3 minutes of running. (remove the oil filler cap) The other obvious sign of top end lubrication is the valves starting to get quiet after a couple of minutes. Don't be too hasty. I have had a few engines that took darn near 10 minutes for the last lifter to calm down, although most of the time it's been well under 2 minutes, and a few times under 30 seconds.

Keep us posted. I am curious as to how you make out!
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