Last year I had my oil pump replaced and gear driven cams installed. When I drive thru town slowly my bike heats up and oil pressure comes on and oil pressure gauge goes very low or completly down. What do I look at next. Taking a six day trip in a month

The oil pump is driven off the cam gear on the bottom of the dist. The pump just needs to pump and hold the correct oil pressure for the engine. Hope this helps.

What motor? If a SBC you can't just press on the oil pump pick up, you need to have it welded on or they come loose and fall off.
Some pumps need to be primed, I would put mine into pan of clean oil and turn pump until it started sucking up the oil before installing.
If it is a 3800 Buick you need to pack gears with vasoline, so different motors require different steps in order for oil pump to function after replacing it. There is also chance filter is bad, or relief valve is bad, more info would help us help you.

It's directly driven by the crankshaft, in front of the engine block, behind the camshaft timing chain cover and timing chain gear, on the crankshaft. It contains the pressure bypass valve, too. Here's a basic diagram of the 4.6 oiling system:

http://www.supermotors.net/getfile/167729/fullsize/oil-flow.jpg

Maybe the pump inlet screen is clogged with junk? You would have to remove the oil pan to look at that. These engines (when older) will sometimes exhibit low oil pressure if the oil level is even just a quart or so too low.

Cheapo oil filters sometimes lack an anti-backflow valve that the 4.6 must have. Lack of this valve will cause no lubrication for a few seconds.. This will cause premature engine wear.

Good luck from Detroit, MI.

That is normal, many vehicle normal pressure is 50 psi and minimum is 15. The pressure you have is good,Its high but good,some high oil pressure will cause the lifter to solidify and then a misfire will occur, and again this is very rare.many oil pump in yester year car was driven by a worm gear attatch to a distributor, and it is still but without the distributor. So the oil pump is driven the same way and is monitored by the oil pressure sensor,(when oil pressure is low the light will go off then you would know you got a problem). The faster the car is driven the more lubrication its going to need so the oil is buid up at the same time engine demands are high. You dont have anything to worry about enjoy the car come on its a Corvette. Just make sure the level is good and change when its needed.

Assembling an oil pump is not that difficult provided you do a few things to insure that it works correctly. Now, you didn't tell me if the engine was in the frame or out. The difference is that the oil pump drive shaft will already be in the engine and the assembly will be different than if the shaft is out of the engine.

The first thing is that you want to make sure the oil seal is in the pump body and that it's installed in the correct direction. The lip of the seal must face the feed side of the pump. If you look at the gears and the pump body, you'll see that two gears are "thicker" than the other two. Also, the area that these gears go into are the same, one side it deeper than the other in the pump body. The "thin" gears are the feed gears that pump oil into the engine and the "thick" gears are the scavenge gears that pump the oil out of the engine. Once you get the seal installed correctly. You can start putting the gears and drive keys in.

Start by pulling the drive shaft out the back side to the engine as far as possible and installing the inner oil pump gasket. "Stick" the gasket to the engine case with a thin coating of grease. Slide the driven scavenge gear on the shaft with the drive key installed in the keyway of the shaft. The driven gear is the gear with the keyway cut in it. Lubricate the drive shaft and slide the pump body up to the gears making sure you don't go too far and knock the key out of the shaft.

Now put the drive key for the feed side of the pump in the keyway of the shaft and install the feed side driven gear. Make sure the key does not come out of the keyway. Once you get this installed, put the idle feed gear in the pump body. Then install the snap ring on the pump end of the shaft.

Now, carefully slide the pump towards the engine while holding the oil pump drive gear in place in the cam chest. Slide the pump body up to the engine and loosely install the two short bolts in the pump body holding it to the engine. Turn the pump drive shaft and the drive gear so that the keyways are aligned and use a pair of needle nose pliers to insert the key. Then install the snap ring on that end of the shaft.

Then, "stick" the outer oil pump gasket on the outer face of the oil pump body and install the outer cover of the oil pump. Install the four bolts and snug them up to the cover. Now you are ready to tighten the bolts. You should have the pinion gear and oil pump drive gear removed from the pinion gear of the pinion shaft of the flywheel. This will allow you to turn the oil pump while you torque the bolts.

The oil pump bolts torque to 90-110 INCH pounds. Torque the bolts in a criss cross pattern while turning the drive gear in the cam chest with your fingers. If the pump tightens up at any point, you must loosen and reposition the pump slightly and start tightening the pump again. The goal is to get the pump to final torque and still be able to turn the pump freely. Freely is the key word here. Not herky-jerky turning or having to force the gear to turn.

Good Luck

. THATS USUALLY A SING OF THE OIL PUMP GOING BAD/WORN BEARING AT CRANK CAMS . WHEN ENGINES COLD THE OIL IS THICKER AND WHEN THE OIL HEATS UP IT GET THINNER CAUSING LOW ENGINE OIL PRESSURE. IF USUALLY THE LIGHTS COMES "ON" AT IDLE AT NORMAL TEMPETURE AND IT GOES AWAY WHEN ACCCELERATED. THOSE ARE SINGS OF WEAK OIL PRESSURE. ALSO CHECK THE THE WIRE TO THE OIL PRESSURE SENDER FOR RUBBING OR WEAR. HOPE THIS HELPS. THE BEST WAY TO BE SURE IS GETTING A OIL PRESSURE TESTER AT HARBOR FREIGHT THERE LIKE $20 OR SO AND TEST THE PRESSURE. AN AVERAGE SHOULD BE ABOVE 15PSI AT IDLE AND HIGHER 2500 RMS AT 22,000 35,000 PSI GOOD. HOPE THIS CAN HELP OR GIVE YOU A LEAD OR HLEP... SEND ME A FEEBACK PLEASE THANKS

did you install the gear onto the cam? Make sure the oil pump drive is in the correct place from the cam sensor assy to the pump

Absolutely!!! Have you replaced the stock cams with gear driven cams? On almost all cams there are "dots" or "circles" to mark where the cams should be. Additionally if using gear driven cams depending on who makes them there may some additional installation considerations, grinding for clearance, etc.
Also refer to the cam documention on piston position when installing. Hope this helps.

JP

The cam has broken, this is a common problem with the 425/445. The cams are very cheap, made with plastic. Had mine replaced last year at the cost of about $300. Had water pump replaced as well.

your oil pump is either weak or there is sludge i9n the oil pan. my adives is to have the oil pan dropped . chances are sludge is the culprit. as the oil get's warm the pressure should only drop slightly but pressure is generally dictated by engine rpm. pumps are gear driven so if it was a bad pump your oil pressure would start out very low at start up.