Auto Service Professional

DEC 2018

Magazine for the auto service professional

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Page 24 of 61

D e c e m b e r 2 018 A SP 23 a high concentration of ZDDP (zinc phosphate high pressure lubricant) to avoid lier and cam- sha damage. If the stock-type engine features a roller camsha and roller liers, the higher concentration of zinc additive isn't necessary. Finally, and the most critical aspect, is to pre-oil the fresh engine prior to initial startup. While the new or reman engine should have been assembled with bearings and frictional surfaces coated with a lubricant, the oil circuit is likely empty. While cranking the engine, it will take a while for oil to be pumped from the oil pickup, through the oil pump and into the main and valvetrain oil galleries. is can easily re- sult in momentarily starving main bearings, rod bearings, camsha bearings, liers and rocker arms or cam followers. If you're lucky, no dam- age will result. If you're unlucky, there's the very real possibility of bearing and valvetrain dam- age, negating all of your hard work to this point. Play it safe. Always pre-oil any fresh engine before attempting a start. is isn't difficult. In the "old days" when engines were equipped with a distributor, the common approach was to remove the distributor and to turn the sha- driven oil pump with a drill in order to allow the oil pump to send pressurized oil into and through the oiling circuits. Since today's dis- tributorless engines make this approach im- possible, simply use an engine pre-oiler canis- ter. is is a metal "pot" that contains a rubber internal bladder. Simply fill the canister with engine oil, and then charge the canister with compressed shop air. is pushes the bladder against the oil. Connect the canister's hose to the engine, at an oil port (the oil pressure send- er port is a common choice). e canister will include a variety of fittings appropriate for to- day's popular engines. By the way, these engine pre-oilers are avail- able in either steel or aluminum. I strongly advise buying an aluminum unit, to avoid the With the pressure canister filled with oil and charged with shop air, a hose connects to the engine's oil port. As the canister's valve is opened, pressurized oil is forced through the engine's oiling passages. The valve cover(s) should be removed in order to verify that oil is reaching the rockers.

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