With a badly spun rod bearing could oil pressure still remain normal?

[SnowBird]

If it is a rod bearing it is bad because it is loud. But my oil pressure is still fine, was wondering if this is possible?

 

[Defiant]

How are you measuring the pressure, with the factory gauge or aftermarket?
How do you know it's a rod and not a balance shaft bearing?

 

[mjarrell20]

What are the car's symptoms? When I spun a rod bearing my stock gauge said oil pressure was fine, but the stock gages aren't very accurate.

 

[andymoraitis]

My aftermarket said that pressure was good also even though there was enough starvation in the motor to fry number one and four rod bearings and spin the BS bearing.

Typically bearing noise will happen at or around 2500 RPM's and continue. There's no associated power loss however. A great way to test for a spun bearing is to run the motor at idle to the point at which the sound starts. Have a friend remove and replace spark plug wires one at a time. If the noise goes away, it's likely bearing related since the load is being removed from that piston. If the noise continues, it's more likely in the valve train since that's still rotating and under load. Keep in mind that sometimes bad timing belt auto tensioners will make ticking sounds that mimick rod knock.

 

[SnowBird]

stock gauge-thought just stock boost gauge was junk. Cars symptoms are this...No power, I mean it take forever to rev up to 3k and I have an XACT flywheel. Car smokes a little, hard to start, stumbling idle sometimes and stalls somtimes. When it does idle you can hear the noise very faint. But at a little over 1k rpms in starts real loud knocking/ticking that seems like it goes along with the lifters (it has a constant rythm) when I remove the oil cap and look in it seems to go with the beat of the rockers. Then if I rev it up over 3k, (which is hard to do, literally take about 4 to 5 seconds) this weird rattling comes in that has no set pattern. did the spark plug wire test, and actually when a couple different wires are removed the noise doesnt go away-just quiets down a little bit. I never looked at any of my pulleys or even thought about balance shafts. Thing is, this car sat for about 4 months with a blown clutch and then I bought it, there is no way the car could have blown a clutch running like this, it barely moves. DSM mechanics in my town are betting that it jumped time due to all my weird symptoms, ruling out the spun bearing because the car has no power.

 

[mjarrell20]

I would drop the oil pan and look and see if there are any metal shavings, just in case it is a spun bearing. Also take off the valve cover and see if there are any bent valves or any kind of damage done to the head, chances are if it jumped timing it bent some valves. Don't drive it anywhere, I wouldn't even start it up. Have it towed to some one to look at it to tell you exactly what's wrong with it.

 

[SnowBird]

I would drop the oil pan and look and see if there are any metal shavings, just in case it is a spun bearing. Also take off the valve cover and see if there are any bent valves or any kind of damage done to the head, chances are if it jumped timing it bent some valves. Don't drive it anywhere, I wouldn't even start it up. Have it towed to some one to look at it to tell you exactly what's wrong with it.

I pulled off the cover, doesnt look like any bent valves (but then again Ive never dealt with bent valves so I wouldnt know, but nothing looked out of place), and I drained the oil-no chunks of anything-just a slight metallic look to it, but who knows how old the oil was. Once I changed it it was clean. Im gonna TDC it first and see if it jumped, then investigate pulleys and the damn BS stuff. thanks for the help, Im praying the bearings good just because I have huge loss of power, and like I said the car ran fine when the clutch blew, it just sat for 4 months.

 

[Defiant]

My aftermarket said that pressure was good also even though there was enough starvation in the motor to fry number one and four rod bearings and spin the BS bearing.

Part of the folly of having a pressure gauge on the oil pump outlet. Yeah, if you turn the pump, it'll put out pressure. Odd that we don't hear more about people putting a real, useful pressure gauge up there on the side of the head, where the turbo feed is/was.

 

[Demon5spd]

This may just be a stupid replie, but my friends 93 talon did the same thing it would take forever to rev and it took about 30 secs to get to 40mph.

Not sure if this helps but his turbo was toast, have you takin of the intake pipe and took a look at the shaft his was bent and was casuing the same problem as what your describing.

We were going to start to disasemble the motor to check it out and during the process we found the damaged turbo.

 

[SnowBird]

yes my turbo spun freely, I found out my car jumped time.