Alright looks like a spun rod and maybe screwey crank???

[Sbeing1]

Welli went to the track early this week. My alt belt snapped and something in my engine is bangin or knocking (sounds like under the intake mani, and under the engine ) from what ive read from previous peoples posts this sounds like i spun a rod..... So what should i buy now? any suggestions? ill have to save up and have a shop replace it. And also is there a diff between a rod and a rod bearing? should i replace both?? thanks alot guys your the best


VID OF PROBLEM HERE: http://www.freewebs.com/jdxcc/vid of problem.MOV (right click save as, its easier)

 

[wolf20043]

Welli went to the track early this week. My alt belt snapped and something in my engine is bangin or knocking (sounds like under the intake mani, and under the engine ) from what ive read from previous peoples posts this sounds like i spun a rod..... So what should i buy now? any suggestions? ill have to save up and have a shop replace it. And also is there a diff between a rod and a rod bearing? should i replace both?? thanks alot guys your the best

The rod is what connects the piston to the crank. If a rod broke You would know for sure as most will push out the side of the block when getting smancked by the crank. I would drain your oil into a clear pan, and look for what will appear to be copper shavings. If so, it is a bearing.
Mike

 

[Turbocharged]

Sounds to me like your crank pulley is bad. The harmonic dampener goes bad and the pulley will make alot of noise. It also causes belts to be thrown or broke. When my harmonic dampener failed it broke my alternator belt as well.

Just look under the drivers side wheel well and remove the cover. It will be easy to tell if it is the pulley.

 

[wolf20043]

Sounds to me like your crank pulley is bad. The harmonic dampener goes bad and the pulley will make alot of noise. It also causes belts to be thrown or broke. When my harmonic dampener failed it broke my alternator belt as well.

Just look under the drivers side wheel well and remove the cover. It will be easy to tell if it is the pulley.

Good point. If You can grab it and it moves from side to side, it should be an easy fix.
Mike

 

[92awddsm]

It could also be a balance shaft bearing. this will also leave particles in the oil. Check the balancer and if it is still good, you need to pull the oil pan and inspect everything.

If it is a rod bearing, you will need to either recondition or replace the bad rod. I also recomend resizing the other 3 at the same time. If you are doing this much, you might as well install arp rod bolts at the same time. The crank needs to be magnafluxed and if not cracked, it will need to be reground. Most of the time, when you spin a rod bearing in a 4g63, the crank will crack right in the radius so I would just count on replacing the crank. At this point, you should either consider a full rebuild or replacement due to the extent of disassembly and replacement parts.

 

[Sbeing1]

hmm well my crank pulley has a cut on the wall of it (wall of belt area).....i just took the car out for a smooth drive (put some lucan stabilizer to see if its my lifters or not....its not) and it drived and boosted perfect just this weird clunking knocking sound when i go under 1300rpm. I have a question also, if i were to buy new rod bearings and headbolts, head gasket, balance shaft eliminator and have my crank redone how long do u think that will all take, my shop charges 80 bux per hour in labor. Just want to get a good estimate on the cost... thanks alot guys

 

[GSTinCO]

hmm well my crank pulley has a cut on the wall of it (wall of belt area).....i just took the car out for a smooth drive (put some lucan stabilizer to see if its my lifters or not....its not) and it drived and boosted perfect just this weird clunking knocking sound when i go under 1300rpm. I have a question also, if i were to buy new rod bearings and headbolts, head gasket, balance shaft eliminator and have my crank redone how long do u think that will all take, my shop charges 80 bux per hour in labor. Just want to get a good estimate on the cost... thanks alot guys

If you could drive it and it drove fine execpt a clunk under 1300 RPMs then it is not a spun rod bearing. I would not do all that work unless you were already planning on it.

 

[Turbocharged]

hmm well my crank pulley has a cut on the wall of it (wall of belt area).

What are you talking about... please be more specific. The inner part of the pulley is made of a tough rubber. Make sure that the rubber is all intact and that there is no play in the pulley.

You need to be more specific about when the sound is made (throttle position, what gears/speeds). Does is only make then noise when you are moving or can you make the noise while in neutral? If its only when you are moving, check the following:

1. Half shaft axle is bolted to the block (not loose)
2. U-joint play
3. Motor mounts
4. Carrier bearings

Its definately not a rod bearing if the noise is not increasing with increasing rpms.

 

[Ryan95tsiAWD]

What condition was your alt belt in before you broke it?

When the car is idling and you are looking from the front of the car, do the belts move left and right (wobble)? If it is moving then your crank pulley is probably bad.

BUT

If you have by some chance broken the balance shaft belt this will cause belts to break early as well. If you have broken it, there is a good chance the timing belt will pick it up sooner or later and snap too.

If it were a spun bearing the noise would get MUCH worse as RPMs increased.

 

[destruckeclipse]

As said above, if it was a problem with internals it would be rpm dependant. Definately check around and make sure nothing is loose.

 

[Sbeing1]

alright well i checked and it does make the noise at idle and in drive (im auto). Also my new alt belt is squeeling super SUPER loud...after about a min or 2 it stops....also the belts dont look like there wobbling at all. Would this narrow it down to the balance shaft belt?? im not quite sure where that is, is there a way to check to see if its fine? I could videotape what happens and post it if you guys think itll help. Thanks alot guys im soo glad its not the rod bearing

 

[Sbeing1]

What are you talking about... please be more specific.

oh, sorry. You know the part where the belt lays onto the crank pulley. Well imagine the belt is on the pulley and you know on both sides of the belt there are walls that eclose the belt onto the pulley. Well i have a about 1cm cut out on the wall.. i just saw it the other day.

 

[Turbocharged]

What are you talking about... please be more specific.

oh, sorry. You know the part where the belt lays onto the crank pulley. Well imagine the belt is on the pulley and you know on both sides of the belt there are walls that eclose the belt onto the pulley. Well i have a about 1cm cut out on the wall.. i just saw it the other day.

That hole in the drivers side wheel well is supposed to be there. You need to VISUALLY inspect the actual crank pulley. Go under your car and check that the pulley is in good shape (particularly the inner dampener).

 

[Ryan95tsiAWD]

alright well i checked and it does make the noise at idle and in drive (im auto). Also my new alt belt is squeeling super SUPER loud...after about a min or 2 it stops....also the belts dont look like there wobbling at all. Would this narrow it down to the balance shaft belt?? im not quite sure where that is, is there a way to check to see if its fine? I could videotape what happens and post it if you guys think itll help. Thanks alot guys im soo glad its not the rod bearing

First make sure the belt is tight. You should be able to push down on the belt (in the middle between pulleys) with a little force and it not move more than 1/4 to 1/2 inch.

If your tightness is good, check to see if the belt is rubbing either wall of the Alt. pulley more than the other. If it is then check to make sure all your Alt. bolts are tight (you would be surprised at how often they come loose).

As far as the balance shaft belt goes, it is under the cover with the timing belt. The only way i know to check it is to pull the cover like you were going to change the timing belt. How many miles are on your timing belt? Maybe a good time to go ahead and change it if you havent in a while...

Did you try to spin your Alternator pulley while you had the belt off? I have never had this happen but maybe your alternator is putting alot of stress on the belt b/c it is going bad (something else to check before you go pulling everyting apart).

 

[Sbeing1]

What are you talking about... please be more specific.

That hole in the drivers side wheel well is supposed to be there. You need to VISUALLY inspect the actual crank pulley. Go under your car and check that the pulley is in good shape (particularly the inner dampener).

who said anything about a wheel well i am visually inspecting the crankpulley and im saying theres a chip off of it .......

 

[Sbeing1]

First make sure the belt is tight. You should be able to push down on the belt (in the middle between pulleys) with a little force and it not move more than 1/4 to 1/2 inch.

If your tightness is good, check to see if the belt is rubbing either wall of the Alt. pulley more than the other. If it is then check to make sure all your Alt. bolts are tight (you would be surprised at how often they come loose).

As far as the balance shaft belt goes, it is under the cover with the timing belt. The only way i know to check it is to pull the cover like you were going to change the timing belt. How many miles are on your timing belt? Maybe a good time to go ahead and change it if you havent in a while...

Did you try to spin your Alternator pulley while you had the belt off? I have never had this happen but maybe your alternator is putting alot of stress on the belt b/c it is going bad (something else to check before you go pulling everyting apart).

alright the tightness is good. The belt is on more of the driverside side of thecrank pulley..possibly rubbing. The belt is in great shape i just bought it and put it on. Im going to change the balance shaft out with a eliminator this weekend if not next weekend. My timing belt only has about 1.2k miles on it so im not going to change that. ill check the alternator tommorrow. thanks alot man

 

[Sbeing1]

i was wondering, what if i just took the balance shaft belt out and left it like that..... could this cause damage? just a thought that came to mind

 

[saiyansniper]

If you just pull the balance shaft belt off, you're still going to have the rear balance shaft spinning, as it is driven by the timing belt. You could lose the BS belt, remove the rear balance shaft and cut the weighted section off, re-install and call it a day but that's probably much more involved than you're looking to do.

 

[Sbeing1]

If you just pull the balance shaft belt off, you're still going to have the rear balance shaft spinning, as it is driven by the timing belt. You could lose the BS belt, remove the rear balance shaft and cut the weighted section off, re-install and call it a day but that's probably much more involved than you're looking to do.

yea perhaps your right, thanks

 

[Sbeing1]

Alright im uploading a vid of the car as we speak, hopefully thatl help you guys help me determine the exact problem.

 

[Sbeing1]

ALRIGHT. HERES A VID OF MY PROBLEM (might wanna turn up the volume to hear it) Any help is appreciated http://www.freewebs.com/jdxcc/vid of problem.MOV (right click save as, its easier)

 

[Sbeing1]

Can anyone help me with what is in the vid?? Today im going to take off just the balance shaft belt and see if that remedies the problem, if so, i will get a eliminator. One question though, Ive heard numerous amounts of people on here that just simply took off the balance shaft belt and left it be and they have no problems at all. Is this ok to do? From what i see it shouldnt really make that much of difference if i do the kit or just simply take off the belt. If someone could ellaborate on the subject it would be appreciated. Thanks alot for all the help guys!

 

[Ryan95tsiAWD]

If you have by some chance broken the balance shaft belt this will cause belts to break early as well. If you have broken it, there is a good chance the timing belt will pick it up sooner or later and snap too.

If it were a spun bearing the noise would get MUCH worse as RPMs increased.

I ran with one broken (unknown to me) and broke 2 alt belts within 3 months. Other than that i did not notice any other issues but that does not mean something else might not happen.

 

[Sbeing1]

I ran with one broken (unknown to me) and broke 2 alt belts within 3 months. Other than that i did not notice any other issues but that does not mean something else might not happen.

Alright, so what if i just took off the belt and let it be? Id of course get the eliminator in time (im a full time student, i dont make very much at the moment) but is it ok if i run without just the belt for a month or so? Thanks alot for all the help.

 

[Sbeing1]

Ok well i went and just took off the bs belt. I put all the pulleys back on, belts, timing cover etc. I turn it on and i still have that clacking tapping noise....very discouraging. And to add to the madness I now have oil spilling out of my lower timing belt cover, what did I do wrong?? I dont understand and i have no idea what to do. If anyone can help I would greatly appreciate it. Thanks Guys!