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Original Message
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| RE: Help! 427 Top Oiler low oil pressure problem (long |
| By John - 12/03/2000 8:15:36 AM; IP 142.177.52.10 |
| Tis weird indeed, but your problem is sounding more and more like mine, just I still have fairly high pressure, but it does build up more slowly than it use to, and no amount of reving will increase it. One fellow said he had a similiar problem, and found his block was cracked...Yikes! It is without doubt that low presure can only be caused by 2 things (assuming the oil pump is functioning, and thy hardly ever fail)...an internal leak, or a pressure relief valve problem. Like my engine, you say your bearings are fine...so look for a leak. I agree that the press-in plugs along the center gallery under the intake manifold could have popped out, but this should have been an all-of-a-sudden problem, not a gradually worseing one (I used scew-in plugs). The fact that your pressure is so very low indicates a leak closer to the pump than the last cam journal(cam bearings rarely fail)....There is a press-in plug next to the distributer drive also...you can pull the distributor and check it by looking down the dist hole with a flashlight. But you should really remove the pan and look up under the cam gear to see if the driver side cam retaining plate screw is loose. There's a small gallery there to lubricate the dist drive, and this screw plugs off the gallery where it was originally drilled out at the factory. Just for your info, a high volume pump should put out 80 psi cold idle or at revs when warm, and idle oil pressure should be about 18 to 22 warm. I am very interested in what you find out. By the way, I use solid lifters with the lifter galleries blocked off....If you are using hydraulic lifters, maybe something is wrong there...cracked block?....lifter popped out with bent pushrod?....I don't know,but you might as well tear the intake manifold off and have a look...check the press-in plugs at the same time. Oil bleed-off from your last cam bearing is difficult to fathom. Maybe it's just that your engine has a nose-up attitude in your vehicle and that oil drains to the back of the block in the lifter valley area. Any crank or rod bearing can show more oil than others if the oiling holes happen to line up just after you shut the engine off (pretty co-incidental I must admit). Anyway, what ever you find, please let us know. I for one am very interested in this. If I can be of more help, you may contact me directly at carol.martin@ns.sympatico.ca. |
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