Hi everyone.
Recently completed a lot of rebuild activities on a late model A4 while the engine was still on the boat...including acid dipped head and manifold, machined head and manifold, cleaned out all oil and water ports, new head and manifold studs, new head and manifold gaskets, new aftermarket thermostat, rebuilt carb and mechanical fuel pump, new plugs and wires, new coil, replaced water pump, new starter, repainted engine, etc. I saw no need to replace pistons, rings, or valves. Already had installed electronic ignition.
Before the rebuild my oil pressure was at about 45 PSI. After the rebuild I found my oil pressure diminished to less than 20 PSI while cylinder compression remains very good. Operating temp is dependable, between 140 - 170 degrees. 'Thought maybe my old oil pressure gauge or sender was bad, so I replaced them both. New Teleflex gauge and sender shows oil pressure at 10-15 PSI, barely high enough to avoid triggering the oil pressure alarm. I cannot explain the symptom after replacing the instrument and retorging everything a few times.
Is it likely that cleaning out all of the oil and coolant ports and the improved lubrication flow would account for the severely diminished oil pressure? Thanks.
Recently completed a lot of rebuild activities on a late model A4 while the engine was still on the boat...including acid dipped head and manifold, machined head and manifold, cleaned out all oil and water ports, new head and manifold studs, new head and manifold gaskets, new aftermarket thermostat, rebuilt carb and mechanical fuel pump, new plugs and wires, new coil, replaced water pump, new starter, repainted engine, etc. I saw no need to replace pistons, rings, or valves. Already had installed electronic ignition.
Before the rebuild my oil pressure was at about 45 PSI. After the rebuild I found my oil pressure diminished to less than 20 PSI while cylinder compression remains very good. Operating temp is dependable, between 140 - 170 degrees. 'Thought maybe my old oil pressure gauge or sender was bad, so I replaced them both. New Teleflex gauge and sender shows oil pressure at 10-15 PSI, barely high enough to avoid triggering the oil pressure alarm. I cannot explain the symptom after replacing the instrument and retorging everything a few times.
Is it likely that cleaning out all of the oil and coolant ports and the improved lubrication flow would account for the severely diminished oil pressure? Thanks.
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