No Oil Pressure!! Na-t Sc300 Build
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No Oil Pressure!! Na-t Sc300 Build
So the plan was to get oil flowing through the turbo and motor before firing it up but we are getting no oil through the feed line. Yes, the car does have oil in it. It has not been driven in almost a month. We kept the oil feed line unhooked from the turbo to make sure we had pressure in the line before connecting the line to the turbo.... nothing. We tapped the union bolt for the oil feed. We took out the INJ fuse and disconnected the Ignition Module so no fuel or spark while cranking. I ended up disconnecting the oil feed line from the fitting tapped in the union bolt expecting to see at least some oil.... nothing. Im just wondering how long you have to crank this car before it gets some oil. We were cranking for 5 - 10 sec intervals over a length of about 3 min, resting the starter throughout. Its starting to freak me out. We did swap the headgasket and send the head out to have it rebuilt. We also replaced the strainer and I did put in the strainer gasket. At this point Im going to pull off the oil filter housing and see if oil sprays out while cranking then. If not I will drop the pan and put the pick up in a "bowl" of oil so I can watch it try to pull the oil up. At this point if the union bolt isnt getting oil pressure I assume the entire motor is not getting oil either. Sorry for the length. I just wanted to be detailed.
Thanks in advance for any help,
Ki
Thanks in advance for any help,
Ki
Last edited by KiPod; 04-26-08 at 07:45 AM.
#2
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My .02
1.rebuilding the head shouldn't have anything to so with this
2.cranking for 5-10 sec definitely creates oil pressure. Stop doing that as well because if you have no oil pressure. You've just spun your crank a hundred times with no lubrication which is VERY bad for the bearings.
3.sounds like the oil pickup tube either fell out and isn't picking up oil, or wasn't installed correctly?
I would start with the pickup tube..just my opinion though
1.rebuilding the head shouldn't have anything to so with this
2.cranking for 5-10 sec definitely creates oil pressure. Stop doing that as well because if you have no oil pressure. You've just spun your crank a hundred times with no lubrication which is VERY bad for the bearings.
3.sounds like the oil pickup tube either fell out and isn't picking up oil, or wasn't installed correctly?
I would start with the pickup tube..just my opinion though
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It just seems hard to mess up 3 bolts. There are three bolts for the pick up. Two bolts where the gasket goes and one bolt for the support arm. I do think its a problem with the pick up though. Thats the only thing that makes any sense. I have heard of people who do not seal the pick up good enough and it just sprays oil rather than holding pressure. Tomorrow I will drop the pan and check it out. I just dont want to drop that pan again. Its not fun and sealed good.
#4
Do you have the plugs out? If not, its cranking very slowly. I always pack the oil pump with vaseline on a rebuild to create a draw that brings the oil up. If its cranking too slowly, you could crank for 10 second intervals forever and never get oil pressure.
Ian
Ian
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Yeah, We are upgrading injectors today anyway so we can pull the plugs at the same time. The plugs were still in before. A buddy of mine recomended pulling the plugs as well to let the motor spin faster. It didnt even cross my mind to take them out to relieve the pressure in the chamber.
Thanks guys
Thanks guys
#6
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turning the motor this much with no lubrication is very bad fro it. whenever i put an engine on the dyno i always build up the oil pressure first with no plugs. having no plugs allows the motor to spin faster and easier to turn over. at the same time when there is pressure in the scylinder it forces the rod and mains closer to the bearings. if you dont have a film of lubrication it can damage the bearings in no time. when priming thwe motor always pull the plugs.
good luck and keep us updated.
good luck and keep us updated.
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Yeah, I wont get get a chance to work on it till tomorrow. I had a turbo mustang before and never had a problem building oil pressure with the plugs in place. I didnt think there would be an issue. I guess its different for each motor. I believe it will be okay once the plugs are removed. But like everything else, we shall see. It will spin so much faster without plugs. I just hope the oil comes quick also.
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We dropped the oil pan and checked the pick up with my "bowl" method. It seemed to pull up some oil and it didnt leak out were the gasket goes so we bolted everything back up, crossed our fingers, and fired it up. Oil was coming out the feed line in about 20sec. Its all good now. Even though it was fine to begin with and we didnt have to take everything apart... again, it is good to have peace of mind knowing everything is as it should be. Now onto the exhaust work.
Thanks guys.
Thanks guys.
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