Author Topic: crank fixed, still wobbles what can I do? (Read 8940 times)

insdtanoodles · « **on:** February 08, 2006, 10:01:04 am »

Okay so this is #2 for getting my crank fixed and it still wobbles but now it really only wobbles while idleing, if I were to rev the engine up the wobble pretty much goes away. Would that one way alternator pulley help fix this problem? When I had my crank done the first time it was like that but it got worse and worse to the point where I couldnt dive it any more. If the alternator is the problem do I buy a new one or can I buy the pulley assembly for it? thanks

wyldman · « **Reply #1 on:** February 08, 2006, 10:48:26 am »

What is wobbling ? Bad balancer maybe ? Is this a 1.9L ?

insdtanoodles · « **Reply #2 on:** February 08, 2006, 10:59:06 am »

yeah its a 1.9L and the harmonic balancer is a new upgraded one and the v-belt pulley is also new. I have heard that the one-way cluth on the new altenator help to stop the back driving of the belt while idling and since it really only wobbles while idling I wazs thinking that was the problem. I wanted so insiught before I went out and bought the pulle/altenator. BTW will a tdi altenator work assuming I get one with the same amp raiting and what year of car would I have to get it from?

wyldman · « **Reply #3 on:** February 08, 2006, 12:02:42 pm »

The one way clutch helps,but it isn't neccesary.

If the balancer\pulley is wobbling,then something is wrong.Is the crank gear on tight and flush ? Maybe the crank was maching incorrectly,or the snout is bent.It could also be the balancer.

I'd pull the balancer off,and check the runout on the crank gear.You can use a dial indicator.If it's OK,then it's gotta be the balancer.If not,then it's a problem with the crank,or the gear.

insdtanoodles · « **Reply #4 on:** February 08, 2006, 12:05:46 pm »

Well I did alittle testing and at idle it wobbles quite abit I can see it with my eyes. When I add some gas the tensioner moves and you can still see it wobble but not much, im guess the engine was about 1100rpm. When I bring it up around 1700-2000rpm the wobbling stops by eye, I had to put my finger on the serpentine belt tensioner to feel any movement or look through the side wheel well and look at the belt itself. I would definatly say that in order to measure the wobbling on the tensioner I would have to use my dial indactor its that little. I am wondering if anyone has any expirence with this problem and if that alternator pulley would help fix it. This happened the first time I got my crank nose fixed, it didnt wobble at all, then I drove it from the shop to home (3kms) and when I got there it was wobbling abit. It got progressively worse and really when reading crank pulley fixes on this forum its the only thing I havent done, this car is really furstrating.

insdtanoodles · « **Reply #5 on:** February 08, 2006, 12:07:35 pm »

Quote from: "wyldman"

The one way clutch helps,but it isn't neccesary.

If the balancer\pulley is wobbling,then something is wrong.Is the crank gear on tight and flush ? Maybe the crank was maching incorrectly,or the snout is bent.It could also be the balancer.

I'd pull the balancer off,and check the runout on the crank gear.You can use a dial indicator.If it's OK,then it's gotta be the balancer.If not,then it's a problem with the crank,or the gear.

I guess I will give that a try, thanks.

wyldman · « **Reply #6 on:** February 08, 2006, 01:15:46 pm »

If your really stumped,my shop is in Brampton.If you feel like driving out,I can take a quick look at it for you.

insdtanoodles · « **Reply #7 on:** February 08, 2006, 02:07:48 pm »

well I took off the harmonic balancer and used my indicator on the timing sprocket. On the front I got .0024 so it is sitting pretty flat. Then I tried on the outside but I didnt take the belt off so my reading were kinda wacky but it never went out more then .010 after figuring out the difference between the start number and the end, it never started a 0 and after a full rotation stopped at 0. I put on the harmonic balancer and the runout was .011. I am really stumped with that, waiting for my dad so he can help me make sure that my crank bolt is torqured properly.

commuter boy · « **Reply #8 on:** February 08, 2006, 06:55:48 pm »

Sometimes the balancers need to be shimmed to be spot on, or maybe it's just unbalanced internally.

My dad (VW mech) had a client go through three of them before he could get one that was perfect with a bit of shimming, but the guy was a bit of a perfectionist.

Try another balancer w/b my first guess if the work was done right and the bolt was torqued on properly.

QuickTD · « **Reply #9 on:** February 08, 2006, 07:22:31 pm »

The one way clutch on the alternator pulley will stop the serpentine belt tensioner from "dancing" at idle, but it won't straighten a wobbling pulley. Be careful not to confuse engine vibration with pulley wobble, use the engine as a reference to determine if the pulley is wobbling, not the car body. Very often the older style harmonic balancer is not properly pressed together and will wobble, sometimes takes a few tries to get a good one.

The very newest style harmonic balancer has the pulley machined onto the portion that is bolted onto the crank pulley and the weight ring is on the inside. If you have one of these and it still wobbles then something is amiss.

insdtanoodles · « **Reply #10 on:** February 08, 2006, 09:27:43 pm »

Quote from: "QuickTD"

The one way clutch on the alternator pulley will stop the serpentine belt tensioner from "dancing" at idle, but it won't straighten a wobbling pulley. Be careful not to confuse engine vibration with pulley wobble, use the engine as a reference to determine if the pulley is wobbling, not the car body. Very often the older style harmonic balancer is not properly pressed together and will wobble, sometimes takes a few tries to get a good one.

The very newest style harmonic balancer has the pulley machined onto the portion that is bolted onto the crank pulley and the weight ring is on the inside. If you have one of these and it still wobbles then something is amiss.

something is definatly funny with this car but im not sure if it is pulley wobble or engine vibration. I ran the engine with just the pulleys on it and the looked to be running very true and I even got some people look at it too for a second opinion and they said it was fine. put the belts on and well now I dont know if it is wobbling or "dancing" going to have to find someone that does. I hope wyldman can take a look at it soon.

On the good side thou after rebuilding the engine and putting it back together everything seems to be working just fine, drove 130km back home without a problem, not bad considering before this I had no automotive repair experience I just my ***ty haynes manual.

wyldman · « **Reply #11 on:** February 09, 2006, 06:06:15 am »

I can take a look at it if you want to drive it up.I have a few balancers here,so we could try swapping them if needed.

insdtanoodles · « **Reply #12 on:** February 10, 2006, 06:13:43 pm »

thanks alot wyldman, put my mind at ease but now I am looking for the alternator pulley. I am just wondering what year of tdi can I get this pulley from and will it fit on my alternator? I seem to recal having a 90A alternator if they even have one with that rating, I just looked at it breifly while it was out of the car. If I cant replace the pulley will new tdi alternators fit?

thanks.

wyldman · « **Reply #13 on:** February 11, 2006, 12:23:41 pm »

I believe Altrom carries the pulley,but it isn't cheap.It think it's $115.00 or so.I'd try some local scrap yards,as a lot of cars out there have the updated pulley.You could also try a local alternator rebuilder.

Was nice to meet you,glad you could drop by.

If anyone else in the GTA needs something looked at,feel free to drop by.

insdtanoodles · « **Reply #14 on:** February 12, 2006, 08:42:16 am »

Quote from: "wyldman"

I believe Altrom carries the pulley,but it isn't cheap.It think it's $115.00 or so.I'd try some local scrap yards,as a lot of cars out there have the updated pulley.You could also try a local alternator rebuilder.

Was nice to meet you,glad you could drop by.

If anyone else in the GTA needs something looked at,feel free to drop by.

I went to a auto wreckers looking for the pulley and I had no luck, I look at a 2000 tdi alternator and both had the normal pulley. Do you know what year they started to show up on alternators?