Had a guy look at my engine and he said it sounds like i spun a bearing

[91TurboTalonFWD]

Had a guy look at my engine and he said it sounds like i spun a bearing...

i do not know anything when it comes to bearings so i need your help...

which bearing did i spin

is this a hard job to do

please help me out point me in the right direction!

Thanks in advance

 

[EagleTalonTim]

There is no way to know exactly which bearing you spun without pulling the oil pan. Depending on if you messed up the crank, it can be a tough job. If the crank is not messed up at all, you may get away with just replacing the bearings. Pull your oil pan and check the damage and post back.

 

[architechnik]

Spun a bearing?
Assuming it was just standing there and you weren't actually driving it or shifting gears, then it is an internal engine bearing. There are two primary points for a bearing in the engine, the cams and the crankshaft.

The cams are fairly easy, considering they are right on the head and you just pop off the valve cover. The crankshaft is a little more tricky... as in you have to remove the engine.

Did he mention which bearings? What kind of noises was the engine making?

 

[pedrick1]

if you hear loud knocking while the car is driving then it is a rod bearing. If that is the case you will most likely have to replace the crankshaft because bearings spin when they are starved of oil, which might be a separate problem. When they spin the ruin the polished surface of the crank and cannot just be reused trust me i have tried it.

 

[91TurboTalonFWD]

i was driving like 80 and all of a sudden it was like a big bang and it started to knock

it knocks and the guy thinks its comin from the bottom end.

 

[91TurboTalonFWD]

Oh and i have a longblock sitting behind my house that ran untill the timing belt chewed up under the pulley

so if my crank is bad can i use my old crank? could i use my old bearings? the only problem the engine had was when you downshift it wouldnt pick up speed fast and i was told it had low compression so what could i do to fix the low compression issue...

i have 2 block one with low compression one with a knock and i want to build ONE so help me out

 

[architechnik]

It sounds like you've got a beautiful combination. The compression issue is likely the pistons/rings/bore, so you don't want to use that block or rings, but you could easily swap the crank.
I'd say go with some new bearings, though. They're not expensive and it could save you the trouble of the same event.
Likewise, you will already have it disassembled and will need to check the clearance between the shaft and bearings.

You will also need to check the condition of the block to make sure there isn't any other damage to the one with the bad bearings...

Oh, wait, I just reread your latest post. Make sure you don't have a busted rod. Have you taken anything apart yet?

If there was a seized piston, then the rod may have broken off just above the crank, making noise as it pummeled the side of the block.

 

[Mr Peepers]

I believe there is a way to find out which bearing spun if it is a rod bearing, although I personally wouldn't want to risk any more damage since the engine has to be running. While the engine is idling, remove a sparkplug wire and see if it stops or changes the knock. Replace it and try the next. The one that changes the knock should be the cylinder with the spun rod bearing.

If you do happen to swap the crank from your low compression block, be sure to get it polished along with new bearings as architechnik said.

 

[Black 95 TSI]

+1 for MR PEEPERS. Do what he said about the rod knock to find what cylinder the noise is on.

As for swaping the crank for the one out of the other engine, you should also have the Block line bored for the new crank. But at that point I would just have hte block with low compression rebuilt and bored with better rotating assy installed. Dont try to half ass the job and replace just a bearing. you are asking for trouble, trust me I did that for a custmers car and the car made it around the block

 

[91TurboTalonFWD]

Im going to try and start the car and pull the plugs like Mr Peepers said and the block with low compression im just going to take the crank out of it if needed replaced and put it with the block with good compression but before i do any of it im going to take the block with good compression to a machine shop and have them inspect it and go from there if needed im going to replace the bearings and use what i can out of the other block because my budget is VERY VERY VERY tight +1 for Black 95 TSI Mr Peepers and architechnik Thanks guys!

 

[91TurboTalonFWD]

Yea im going to need alot of that haha

 

[Mr Peepers]

Are your balance shafts removed? If you can't tell a difference by pulling the plugs one by one, I'd check the oil pan for a balance shaft (or other)bearing. You'll have to unbolt the downpipe to get the pan off, but at least you don't have a transfer case to worry about

Here's what symptoms I had when my balance shaft bearing(rear shaft, spins with oil pump) spun:
Obvious initial noise and immediate loss of power when it happened
Engine would often die after being revved or pressing in the clutch coming to a stop
Constant drag on engine
Ticking/knocking sound depending on rpm
Somewhere between 3-4k rpm it sounded the worst
Idle was noisy but more like a tick than knock
Audible when the car drove by

The balance shaft bearings are often the first to go during oil starvation. I was turning a corner then spanked it a little in first to 6k rpm when I heard the noise. Oil starvation was very possible.