Nissan Repair Questions? Ask a Mechanic for Answers ASAP
does it have spark? does it have compression?
let me know
likely bent valves or timing off a leak down test or tear down would be required
if timing jumped that would cause valve strikes which results in bent valves
If you have no compression in any of your cylinders the you either have a cracked head,blown head casket, warped head,cracked block between each cylinder. Was all the spark plugs in good " meaning not striped out " . If you have a bad or bent valve that would let the pressure out of that one cylinder but not all of them at once. Check to see if there is any water in the oil pan, if there is the water will come out first because water is heaver than oil and will go to the bottom so pull the drain plug out slowly to see what comes out first. If there is water in the oil that you have a big problem. Either you have a cracked block or head or head gasket. If there is no water in the oil than I would check the piston rings. First thing to do is take off the valve cover and crank the motor over very slowly and watch all the valves operate right and move up and down the full travel that there supposed to. If they are all good the takes out the bad valve situation. If
is it actually turning over?