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1G Balance shaft sprocket issue

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Justyn

Justyn

5+ Year Contributor
41
5
Sep 30, 2019
Toronto, ON, Canada
Hey everyone,

I’m just finished reinstalling my front case because the seals were leaking. So I’ve replaced all the seals installed the front case torqued all bolts to spec, but I’m having an issue installing the belt driven balance shaft sprocket. The sprocket can only go on one way but it’s not fitting. Hope someone can chime in and help me resolve this issue.

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From what I observed it looks like the shaft isn’t sitting properly. Looks like it hanging off to the side. Wondering is anyone can confirm this. The sprocket is suppose to sit in the shaft with ease but mine isn’t.

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Justyn said:
The sprocket can only go on one way but it’s not fitting
Click to expand...
Justyn said:
From what I observed it looks like the shaft isn’t sitting properly. Looks like it hanging off to the side. Wondering is anyone can confirm this. The sprocket is suppose to sit in the shaft with ease but mine isn’t.
Click to expand...
It should sit in the proper position once you put the sprocket back and oil pressure is applied. That shaft is floating, so it has some in/out play and it would be more without the sprocket is normal. Just match the sprocket and shaft flat part and hold it with the bolt and the washer. And try to spin by hand. If the shaft spin flawlessly, it probably be fine.

Please refer to the video. It would probably give you some idea how it should be.
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DSMPT said:
It should sit in the proper position once you put the sprocket back and oil pressure is applied. That shaft is floating, so it has some in/out play and it would be more without the sprocket is normal. Just match the sprocket and shaft flat part and hold it with the bolt and the washer. And try to spin by hand. If the shaft spin flawlessly, it probably be fine.

Please refer to the video. It would probably give you some idea how it should be.
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Click to expand...
I understand what you mean. The problem is I can’t even get the sprocket to sit on the shaft even though I match them up. I tried putting the bolt and washer in and hand tighten but it would just spin. In the second picture that as far It would go before bottoming out on the spacer. I even tried holding the balanceshft from the bottom end to keep it from sliding back. I’m pretty sure I shouldnt have to force the sprocket onto the shaft.
 
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Justyn said:
I tried putting the bolt and washer in and hand tighten but it would just spin
Click to expand...
What do you mean by just spin? I am not sure how the situation is, but that sounds something is not right.
If you put the sprocket in the correct position by matching the both side flat part (D shape), the shaft shouldn't spin while you are holding the sprocket unless the flat part on the sprocket or/and the shaft side is not rounded or misshapen.
If you meant the bolt keeps spinning, then maybe the thread is stripped.
Can you upload more pics of the inside of sprocket and the shaft without the sprocket?
 
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DSMPT said:
What do you mean by just spin? I am not sure how the situation is, but that sounds something is not right.
If you put the sprocket in the correct position by matching the both side flat part (D shape), the shaft shouldn't spin while you are holding the sprocket unless the flat part on the sprocket or/and the shaft side is not rounded or misshapen.
If you meant the bolt keeps spinning, then maybe the thread is stripped.
Can you upload more pics of the inside of sprocket and the shaft without the sprocket?
Click to expand...
Sorry, I'm trying best to explain. The sprocket is suppose to match up with the shaft (it can only go on one way), while the sprocket is on the shaft and a bolt/washer on and finger tight it, when you spin the sprocket the shaft will spin also.

In my current situation, I see both "D" shape on the sprocket and the shaft but its like the shaft is short or something preventing me from sitting the sprocket on the shaft (inside the sprocket is hitting the spacer) I seen the video a few post back and I seen in that video the sprocket is sitting on the shaft properly, but for some odd reason I cant get it to sit. I even went ahead to removed the front case again to see if there was any obstruction, but its doing the same thing. I double checked the bolt threads and they are not stripped . Sorry I could not get pictures at the moment ill try to get some. I hope its a bit more clear.

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Justyn said:
Sorry, I'm trying best to explain. The sprocket is suppose to match up with the shaft (it can only go on one way), while the sprocket is on the shaft and a bolt/washer on and finger tight it, when you spin the sprocket the shaft will spin also.

In my current situation, I see both "D" shape on the sprocket and the shaft but its like the shaft is short or something preventing me from sitting the sprocket on the shaft (inside the sprocket is hitting the spacer) I seen the video a few post back and I seen in that video the sprocket is sitting on the shaft properly, but for some odd reason I cant get it to sit. I even went ahead to removed the front case again to see if there was any obstruction, but its doing the same thing. I double checked the bolt threads and they are not stripped . Sorry I could not get pictures at the moment ill try to get some. I hope its a bit more clear.

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I dont see a problem. Are you saying you cant tighten the bolt because the shaft and sprocket spins?
 
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yeah it may look like it’s on but it’s not. If I let go of the sprocket it will just drop. There like 1 or 2 mm space that could be seen in the picture. It doesn’t look like it in this photo. It can been seen the sprocket is sitting in the shaft

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Justyn said:
Sorry, I'm trying best to explain. The sprocket is suppose to match up with the shaft (it can only go on one way), while the sprocket is on the shaft and a bolt/washer on and finger tight it, when you spin the sprocket the shaft will spin also.

In my current situation, I see both "D" shape on the sprocket and the shaft but its like the shaft is short or something preventing me from sitting the sprocket on the shaft (inside the sprocket is hitting the spacer) I seen the video a few post back and I seen in that video the sprocket is sitting on the shaft properly, but for some odd reason I cant get it to sit. I even went ahead to removed the front case again to see if there was any obstruction, but its doing the same thing. I double checked the bolt threads and they are not stripped . Sorry I could not get pictures at the moment ill try to get some. I hope its a bit more clear.

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Click to expand...
I am still not sure what exactly the issue is, but are you saying that the sprocket surface and the shaft tip surface don't get the same level? Where green marked in the pic below?
If so, that's kinda normal, you should have like 1~1.5mm gap there (the shaft tip is lower than the sprocket surface). Also when you install the spacer, the shaft goes inside, so you have to pull only the shaft maximumly when you install the sprocket. But usually the shaft gets pulled towards the sprocket when you tighten the bolt.

Does the shaft spin flawlessly and does the shaft have in/out play? Does it go in and come out smoothly with the spacer? If not, could be inside the spacer or shaft is rusty/dirty or so.
And another question, is the spacer factory stock?
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DSMPT said:
I am still not sure what exactly the issue is, but are you saying that the sprocket surface and the shaft tip surface don't get the same level? Where green marked in the pic below?
If so, that's kinda normal, you should have like 1~1.5mm gap there (the shat tip is lower than the sprocket surface). Also when you install the spacer, the shaft goes inside, so you have to pull only the shaft maximumly when you install the sprocket. But usually the shaft gets pulled towards the sprocket when you tighten the bolt.

Does the shaft spin flawlessly and does the shaft have in/out play? Does it go in and come out smoothly with the spacer? If not, could be inside the spacer or shaft is rusty/dirty or so.
And another question, is the spacer factory stock?
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Click to expand...
That’s the answer I was looking for LOL. So it does get pulled in when bolted and torqued? I wasn’t sure whether there was supposed to be a space there or if is supposed to be sitting directly in the shaft. Sorry guys its very hard to explain something like this when your not present to see it.

DSMPT said:
I am still not sure what exactly the issue is, but are you saying that the sprocket surface and the shaft tip surface don't get the same level? Where green marked in the pic below?
If so, that's kinda normal, you should have like 1~1.5mm gap there (the shaft tip is lower than the sprocket surface). Also when you install the spacer, the shaft goes inside, so you have to pull only the shaft maximumly when you install the sprocket. But usually the shaft gets pulled towards the sprocket when you tighten the bolt.

Does the shaft spin flawlessly and does the shaft have in/out play? Does it go in and come out smoothly with the spacer? If not, could be inside the spacer or shaft is rusty/dirty or so.
And another question, is the spacer factory stock?
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Click to expand...
The space is factory stock from what I know. I’ve never changed it. The shaft spins smoothly, the shaft spins in and out smoothly with the spacer
 
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thanks guys for your help. Got it figured out.

pauleyman: your right I was overthinking this, but is its better to ask then to guess LOL.​

 
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