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Old 04-08-2011, 11:06 PM   #1
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Low Oil Pressure and Question About Engine Knock

Can't go into much detail because I'm on my phone and its a PITA but I've recently been having an oil pressure around 15 and 20 on the dash gauge which I believe is lower than normal. And also I developed a slight knock coming from one or both the 1st and 2nd cylinders. Read on another post someone had a problem with their timing chain hitting the valve cover. It looks like I need a new gasket on the cover anyways because someone half @$$3d some rtv seal on it and there are some small gaps leaking oil all over the place. Any suggestions would be greatly appreciated. I'll be under the Jeep installing new axles tomorrow morning so any quick fixes I could do that don't require new parts (no money til Friday) would also be appreciated. Thanks guys

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Old 04-09-2011, 12:22 AM   #2
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timeing chain hitting valve cover,is not good.change windshield wipers,and you should be just fine.

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Old 04-09-2011, 08:54 AM   #3
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haha probably should've thought before saying that. but in alll seriousness what could be causing it in those two cylinders and it gets a little worse as i put it under load. and could it be related to the low oil pressure? it idles at the right level but drops once i start driving and stays that way til i turn it off again.
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Old 04-09-2011, 12:23 PM   #4
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I've seen the oil pump sump screen get clogged with sludge, I'd drop oil pan and see how bad it looks if PO didn't change oil Reg that may be the problem while the pan is off I'd go ahead and replace oil pump and check main and rod bearings.
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Old 04-09-2011, 12:25 PM   #5
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My oil pressure, after it gets warm, at idle is typically around 14. I'm wanting to say 16 is the norm, with it being Round 40-60 when driving.
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Old 04-09-2011, 03:43 PM   #6
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Mine never drops below 40-45
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Old 04-09-2011, 07:26 PM   #7
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mine usually runs about 20 or so while running around and idles a little lower than that. idk what the deal is. It really doesn't affect the power or performance of it much but its been like this since I got it back in december.
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Old 04-09-2011, 07:34 PM   #8
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Have you added oil since you have seen it leaking? That would cause both the knocking sound and the low pressure. Mines runs at 10psi when fully warmed up, it rises about 5psi with every 1k rpms, been this way since I got the jeep over a year and half ago and she runs great.
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Old 04-09-2011, 07:42 PM   #9
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i guess i can live with it for now. doesn't drive bad at all and i changed the oil about 3 times within a thousand miles cuz i drowned the engine and was trying to get rid of all the water. it doesn't really lose that much oil either. i think i need a better oil cap and new pcv valves cuz it seems to be coming from underneath those three spots
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Old 04-10-2011, 12:24 PM   #10
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If it did not knock before you drowned it and does now, I would seriously consider dropping the pan and taking a good look, could be pump and or spun bearing..
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Old 04-10-2011, 12:39 PM   #11
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Personally I'd stop driving it until I dropped the pan like Garyk said. If your oil pressure drops to low, bye bye engine.
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Old 04-10-2011, 12:40 PM   #12
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Also, neither of my Jeeps go below 40. One is a 2.5L and the other is a 4.0L.
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Old 04-10-2011, 02:25 PM   #13
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I don't know if they changed the Timing chain and gear from 89 to 93, but the one that came in mine was an Aluminium Cam gear with nylon coated teeth and a folding square toothed chain.

This lovely contraption is supposed to make the engine quieter. What it did was shatter the nylon, then, because the chain was now looser in the teeth on the gear it ran rough for a while and then stripped the teeth off 1/3 of the gear. Thankfully the 4.2 is a non-interference engine.

I ended up with pieces of Nylon and Aluminium shavings in the oil and stuck in the sump screen. The pieces were large enough to block most oil flow, which was really a problem at the point since starting the engine was the last thing I was going to do.

Luckily for me, I was in England at the time and they couldn't even get the original gear at the Jeep dealer there. I had to "settle" for a full steel roller chain set.

Just a friendly warning about ignoring any timing chain issues.
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Old 04-10-2011, 09:43 PM   #14
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15-20psi at a hot idle is normal for most older engines. I would not be concerned by those numbers. I wouldn't put all my faith in any readings from the factory oil pressure gauge however.
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Old 04-10-2011, 11:15 PM   #15
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All my gauges are a bit iffy anyways. My gas gauge stops moving around the 1/4 tank mark so then I have to guesstimate according to my trip odometer how many more miles I can go before I fill up. So the gauge could be misleading. I don't really have the money to go messing around under the Jeep and screwing something up so I should be able to hold off on it for a while. but I'm going to remember all these suggestions for when I finally a good chunk of change saved up so I have some wiggle room on repairs.

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