Spun rod bearing? Way to check? - Dodge SRT Forum
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post #1 of 21 (permalink) Old 07-07-2008, 11:51 AM Thread Starter
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Spun rod bearing? Way to check?

besides a teardown, are there any sorts of tests that can be done with the engine in place to help see if there is anything fucked up with a rod bearing (spun)?

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post #2 of 21 (permalink) Old 07-07-2008, 11:55 AM
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If a bearing is spun, You can count on more damage
than can be bandaided back to health !
Plan a complete rebuild or replacement.

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post #3 of 21 (permalink) Old 07-07-2008, 12:17 PM Thread Starter
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hmm ok I dont thinnk its spun, however id like to be on the safe side. Im weighing out my options right now. If a bearing were spun would the car drive like crap? Would it make a loud ticking noise, and get louder as I rev? My compression is spot on and the car drives like normal. I do have some knock at 2800-3000rpms in all gears but thats been there for a little while now (getting aeroforce to update my sct flash with it to fight it)

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post #4 of 21 (permalink) Old 07-07-2008, 12:25 PM
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tear it down. even if its not a rod, it sounds internal with the noise increasing with the rev. Im sure you will find something potentially deadly on the teardown even if its not spun. better safe then sorry.

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post #5 of 21 (permalink) Old 07-07-2008, 12:27 PM
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give it some load in say 4th or 5th gear in low rpms. easiest way to hear for it...

it will sound like marbles in a tin can.

its distinct. if you hear it, you have a spun bearing. no way to miss it...
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post #6 of 21 (permalink) Old 07-07-2008, 12:29 PM
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with out a tear down there is no real way to check......but spun rod bearings will make a sqealing noise......if the bearing was totally gone it will tap.....if the bearing was gone it would have a slightly lower compression than the rest.....but yes you need to tear down
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post #7 of 21 (permalink) Old 07-08-2008, 05:18 AM
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Could also be loose bolts on the flex plate / flywheel,
depending on clutch setup. Alternator problem, water pump
so it,s very hard to tell without being there.

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post #8 of 21 (permalink) Old 07-08-2008, 05:45 AM
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Used oil analysis. A bad bearing will easily set off a big red flag (and the analysis can help spot other premature wear issues and internal problems before they get too big, in addition to showing help well your oil is performing). Also if you can get an automotive stethoscope and listen while free revving the engine you should be able to pinpoint the noise. Rod knock will be very noticeable while listening to the lower end of the engine. You should also be able to connect a manual pressure gauge to the block (take off the stock oil switch and connect the gauge) to check what oil pressure is doing, but if you suspect a bad bearing I wouldn't run the engine much.

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post #9 of 21 (permalink) Old 07-08-2008, 06:39 AM
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Grab a long screwdriver and place it between the runners on the top of the block and put your ear against the end of the screwdriver. You'll be able to find it fast if its internal.

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post #10 of 21 (permalink) Old 07-08-2008, 07:12 AM Thread Starter
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im actually pretty confident my sound is coming from a pulley or access. belt. i overfilled my p/s resevoir and the next day i got a squeel. Ive since sucked a bunch out but it still will squeel for a few minutes when i first begin driving. no longer at idle just while rpms are up. it seems to be doing it for shorter and shorter amount of time.

im almost thinking the belt is impregrenated with the p/s fluid. or maybe the fluid got into one of the pulleys...

or maybe its not even related and was purely coincidence. anyhow i wanted to just keep an eye out for other things it could be (such as the rod bearing). I did make another post without any luck but i figure if i remove the access belt and no sound then its related to belt or pulley so.... ill do that but i cant seem to find the tensioner release.?

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post #11 of 21 (permalink) Old 07-08-2008, 07:24 AM
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Quote:
Originally Posted by Roach View Post
im actually pretty confident my sound is coming from a pulley or access. belt. i overfilled my p/s resevoir and the next day i got a squeel. Ive since sucked a bunch out but it still will squeel for a few minutes when i first begin driving. no longer at idle just while rpms are up. it seems to be doing it for shorter and shorter amount of time.

im almost thinking the belt is impregrenated with the p/s fluid. or maybe the fluid got into one of the pulleys...

or maybe its not even related and was purely coincidence. anyhow i wanted to just keep an eye out for other things it could be (such as the rod bearing). I did make another post without any luck but i figure if i remove the access belt and no sound then its related to belt or pulley so.... ill do that but i cant seem to find the tensioner release.?

Thanks
Put car up on jack stands and pull the lower splash shield off
that is on the pass side of engine, you will see the tensioner there.

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post #12 of 21 (permalink) Old 07-08-2008, 07:25 AM
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Quote:
Originally Posted by blackbird_R/T View Post
Used oil analysis. A bad bearing will easily set off a big red flag (and the analysis can help spot other premature wear issues and internal problems before they get too big, in addition to showing help well your oil is performing). Also if you can get an automotive stethoscope and listen while free revving the engine you should be able to pinpoint the noise. Rod knock will be very noticeable while listening to the lower end of the engine. You should also be able to connect a manual pressure gauge to the block (take off the stock oil switch and connect the gauge) to check what oil pressure is doing, but if you suspect a bad bearing I wouldn't run the engine much.
I agree an oil analysis will tell you right away. If you spun a rod bearing you would hear it. I spun a bearing on my 70 Cuda and it sounded like someone was beating the car with a hammer and got worse every second. The oil filter was full of metal and the cam and oil pump were scared and that all happened in a few minutes!

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post #13 of 21 (permalink) Old 07-08-2008, 07:29 AM Thread Starter
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after a few minutes my car (idle or revving) has none of the original sound i get during startup. like i said, the spun bearing question was more of an extreme whatif that i wanted to think about just in case. but im guessing if it was bearing the sound wouldnt go away at all

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post #14 of 21 (permalink) Old 07-08-2008, 08:30 AM Thread Starter
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On the way to work I timed it. Took approx 2min before the noise went away. That is without any sort of waiting around in my driveway for warmup. In fact the tstat was at approx 150deg so the engine wasnt fully warm yet.

Regarding the tensioner, man that stinks. On my old 2.0L SOHC the adj knob was right under the power steering pump and easy access from the top of the engine bay. Oh well, cant have my cake and eat it too I suppose.

Any other thoughts?
Thanks guys!

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post #15 of 21 (permalink) Old 07-08-2008, 08:33 AM Thread Starter
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Quote:
Originally Posted by onthedwnlow View Post
with out a tear down there is no real way to check......but spun rod bearings will make a sqealing noise......if the bearing was totally gone it will tap.....if the bearing was gone it would have a slightly lower compression than the rest.....but yes you need to tear down
Whats an example of slightly lower? I checked it over the weekend and it was something like
165, 165, 165, 170

Ive gone off the 10% rule, in which this case would be +- 16. So mine would in fact be more like a diff of 3%

Just getting thoughts on this. Thanks

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