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Have a 2004 terracan - 3.5L V6 Petrol, No Compression Cylinder #1 - Apply Compressed Air into Cylinder - Exhaust & Inlet Valves appear to be sealing dependant on position of Crank. What Baffles me is in two positions of crankshaft with compressed air into cyl the compressed air is coming out of cylinder #2 plug tube, alternatively turn the crank over 180 deg compressed air comes out cyl #6 plug tube. No comp air coming out exhaust or intake which indicates valves sealing. I have the top half of the inlet valve removed - Any suggestions on why this is happening - Was chasing ring fault on #1 piston but would have expected comp air out of oil cap/crankcase
Cheers
 
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