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| jsup | Need some serious help here.... | ||
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Elite Guru
 
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When i start the car from cold, the oil pressure is good, and the oil temp is low. The car runs like a raped ape. Head snapping torque off the line and just goes goes goes....
When the car warms up, the oil temp goes up too high, and the oil pressure starts to drop. The header is less than 1/8 inch from the oil filter. I wrapped the header in header wrap, just in the area of the oil filter. No difference. When the car heats up and I start to see the oil issues I mention above, the car runs slower, the valve train starts clattering. I just adjusted all the valves on the passenger side and they are completely quite when the car and oil is cold. I do not believe I have any bad gauges since the engine noise and the oil temp/pressure problems seem to be related. Also, when cold all gauges operate as expected. Throughout this whole thing the coolant temp stays normal. So, HELP!!! |
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Posted on: 2008/5/24 22:02
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| Midnight85 | Re: Need some serious help here.... | ||
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Guru
 
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High oil temp & lower pressure only means one thing, too much friction somewhere. I really hate to see this since you've already been put through hell. I guess I would drop the pan again and check all rods & mains, also steal an old pair of pantyhose from the wife and strain the oil as it drains, easy way to look for shavings etc. I sure hope I'm wrong, for your sake.
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Posted on: 2008/5/24 22:08
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| jsup | Re: Need some serious help here.... | ||
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Is it possible the new piston put in could be doing it?
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Posted on: 2008/5/24 22:16
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| bogus | Re: Need some serious help here.... | ||
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Grand Imperial Pooh-Bah
 
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Oil pressure is effected by three main things:
1. Flow restrictions - is there a blockage or internal leak? 2. Bearings (mains, rods, cam) - if one is bad, you're boned. 3. Pump - RARE isn't strong enough to describe this one. 4. Bad lifter(s) Either way, the chance of metal to metal contact goes up. Remember this: the gap between bearing and surface is about the thinness of a human hair. It's that little bit of oil that separates normal function from disaster. I have been worried for some time, but I suspect your bottom end is toast. I would love to be proven wrong, tho. What is happening with the coolant temps? I would remove the current filter, cut the thing open and see what is up. You are looking for shards of metal inside the folds of the filter element. Also, pour whatever oil is in the filter through a rag to see if there is metal floating around. |
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Posted on: 2008/5/24 23:13
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| jsup | Re: Need some serious help here.... | ||
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Elite Guru
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Quote:
If it were something serious, why am I getting good pressure when the car starts? The main bearings are fine, just had the pan out, everything looked good. The lifters are brand new, what are the odds? HEAT is the problem. Pressure is the symptom. |
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Posted on: 2008/5/24 23:56
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| CasetheCorvetteman | Re: Need some serious help here.... | ||
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How long after start up does this take before the oil is what you call too hot?
What do you call too hot? What pressure is too low? What oil and what viscosity? |
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Posted on: 2008/5/25 0:41
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| jsup | Re: Need some serious help here.... | ||
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Quote:
1. 20 minutes 2. 255* and slightly higher 3. 0 or into the warning strip on the gauge. Now, I understand the gauge isn't all that accurate, however, it does register to the middle when the car is cold. Therefore, it works. 4. 20-50. I went from 5-30 to 10-40 to 20-50 with all the same results. |
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Posted on: 2008/5/25 1:03
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| CasetheCorvetteman | Re: Need some serious help here.... | ||
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Ok, there is something reasonably wrong there then.
Have you pulled the dip stick out to see if the oil is really that hot? |
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Posted on: 2008/5/25 1:33
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| cuisinartvette | Re: Need some serious help here.... | ||
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halfway up on the gauge....Put a mech. gauge on the sender and see what you really have, those gauges arent exactly accurate.
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Posted on: 2008/5/25 2:07
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| CasetheCorvetteman | Re: Need some serious help here.... | ||
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Yeah the light coming on is no real proof its low either.
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Posted on: 2008/5/25 2:46
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| cuisinartvette | Re: Need some serious help here.... | ||
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Dont see him mentioning the oil pressure light?
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Posted on: 2008/5/25 3:15
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| CasetheCorvetteman | Re: Need some serious help here.... | ||
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Yeah mate number 3 in post number 7 he says something about it there. I can only assume this is a 90 if the gauge has a warning strip, there is no oil pressure light on any 90-96 cluster i know of, there is only a "CHECK GAUGES" light, and a "LOW OIL" on the DIC from 91 up.
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Posted on: 2008/5/25 3:39
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| jsup | Re: Need some serious help here.... | ||
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Quote:
Yep, check gauges light comes on. |
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Posted on: 2008/5/25 13:22
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| jsup | Re: Need some serious help here.... | ||
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Quote:
I know the gauges aren't accurate. HOWEVER.... When the car is cold, the OP comes up. When the car is cold, the oil temp is low. When the car is cold, there is ZERO valve train noise. When the car gets hot, the oil temp gets hot. When the car gets hot, the valve train makes noise. I am looking at the guage as a binary representation. NOw, if the gauge was the only problem, I'd agree. However, I suspect that it's more than coincidence that all this happens at once. The temp, the valve noise, and the pressure happen all at once. The gauge and the sender are working. I see no indication or have no reason to believe it is not. |
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Posted on: 2008/5/25 13:27
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| FATED | Re: Need some serious help here.... | ||
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Guru Newb
 
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I think that I saw the post where you changed a piston. If you did not get the lifters back in the right holes, assuming they were removed, it will cause noise and low oil pressure. If the lifters never came out of the holes ignore this post.
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Posted on: 2008/5/25 14:01
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| jsup | Re: Need some serious help here.... | ||
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didn't take out the lifters.
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Posted on: 2008/5/25 14:36
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| bogus | Re: Need some serious help here.... | ||
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Grand Imperial Pooh-Bah
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I am going back to our conversation last night... you have a major internal failure just waiting to go.
The replaced piston is the problem. Either the bearing fitment is off or something else is bad. Cut open that filter and see what is what, but I would not be shocked to see metal in there. |
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Posted on: 2008/5/25 18:48
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| jsup | Re: Need some serious help here.... | ||
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Quote:
I just got home, I plan on cutting open TWO FILTERS I have. Anyway, the problem is the heat, not the oil pressure. Oil pressure is the SYMPTOM not the cause. Please explain, serious, how a bad bearing would cause HEAT. Without the heat, there's no pressure problem. I threw our conversation around alot last night to come to this conclusion. |
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Posted on: 2008/5/25 22:34
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| Notorious | Re: Need some serious help here.... | ||
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Quote:
High oil temperature is a classic symptom of impending bearing failure, or more accurately failure in the process of occuring. I don't know your whole story here but were all of the bearings checked when the piston was replaced? Why was the piston replaced? How many miles on this engine? Any internal mods or other history of internal repairs? |
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Posted on: 2008/5/25 23:24
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| jsup | Re: Need some serious help here.... | ||
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Quote:
Thanks very much. Here's the deal... I put in a cam, valve train. I also put on heads, and full exhaust. I dropped a screw down the hole in number 7, thread with pics here. As a result, I got lucky, I had the piston, connecting rod, and rings replaced. I had the head magnafluxed for cracks, no problem. Had a garage put it back together. |
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Posted on: 2008/5/26 0:43
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| Notorious | Re: Need some serious help here.... | ||
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Okay, I really think that checking the bearings is next then. You said nothing about checking or replacing them during the repairs. I fear if that's where you find the problem then, you'll probably be looking at crank damage too. Sorry I can't be more optimistic.
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Posted on: 2008/5/26 0:54
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| jsup | Re: Need some serious help here.... | ||
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If it is the bearing that the garage put in, it's his problem, which isn't the end of the world.
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Posted on: 2008/5/26 1:07
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| bogus | Re: Need some serious help here.... | ||
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Grand Imperial Pooh-Bah
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there is nothing optimistic about loss of oil pressure.
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Posted on: 2008/5/26 2:31
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| jsup | Re: Need some serious help here.... | ||
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Quote:
I am not disagreeing. However, the OP is a symptom, something else is the cause. The shop that put in the piston MAY NOT HAVE DONE IT RIGHT and I'm tyring to see if I have anything to stand on if I take that position. If it is a bearing, I am hoping it's #7. That's the one they touched. If it turns out to be their error, it's not my expense to fix. |
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Posted on: 2008/5/26 2:54
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