ZR-1 Net Registry Forums - View Single Post - Can You Oil Prime with Air Compressor and Gallon Jug?

93 ZR1 Barcelona · 12-10-2012

If you have the cylinder heads installed in the engine, and all the lifters out from their bores, you have an easy way to check if all lifters are receiving oil supply.

Remove the oil pressure sender from the front of the engine next to the oil filter (the long one mounted vertically) and screw there a 1/4 NPTF adapter that you can connect to an air pressure supply.

Apply aire pressure about 30-45 PSI there, and then check that for all the lifter bore holes you have air pressure going out of the orifices. The oil pressure passage inside the cylinder head is common for all lifters and camshafts.

Also check that you have air going out by each center camshaft bearing of the cylinder head, which also has a small orifice which supplies oil to each camshaft.

If any lifter / camshaft hole is plugged, you will have no air out from it. Clean it with a neddle or small wire to remove the dirt, and double check that air is flowing from all.

In an engine that never had problems of main bearing / camshaft failure, it is difficult that this holes become plugged.

But in an engine that has made debris due to bearings or camshaft failure, the metal debris mixed with the oil may have entered the head oil passages and plug this orifices. In that case, the best way is to remove the 1/4 NPTF allen plugs that are at the end of all the oil passages of the head and throughly clean them with comprerssed air and solvent to remove all dirt.

12-10-2012	#9
93 ZR1 Barcelona Join Date: Aug 2007 Location: Barcelona, SPAIN Posts: 41	Re: Oil prime with compressor and gallon jug? If you have the cylinder heads installed in the engine, and all the lifters out from their bores, you have an easy way to check if all lifters are receiving oil supply. Remove the oil pressure sender from the front of the engine next to the oil filter (the long one mounted vertically) and screw there a 1/4 NPTF adapter that you can connect to an air pressure supply. Apply aire pressure about 30-45 PSI there, and then check that for all the lifter bore holes you have air pressure going out of the orifices. The oil pressure passage inside the cylinder head is common for all lifters and camshafts. Also check that you have air going out by each center camshaft bearing of the cylinder head, which also has a small orifice which supplies oil to each camshaft. If any lifter / camshaft hole is plugged, you will have no air out from it. Clean it with a neddle or small wire to remove the dirt, and double check that air is flowing from all. In an engine that never had problems of main bearing / camshaft failure, it is difficult that this holes become plugged. But in an engine that has made debris due to bearings or camshaft failure, the metal debris mixed with the oil may have entered the head oil passages and plug this orifices. In that case, the best way is to remove the 1/4 NPTF allen plugs that are at the end of all the oil passages of the head and throughly clean them with comprerssed air and solvent to remove all dirt.