Service manual is vague on plug hole location

David Diagnostician Georgia Posted   Latest  
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2005 Kia Optima LX 2.4L (6) 4-spd
Replacing Broken Balance Shaft Belt

The service manual I found on Identifix is pretty vague about the plug hole location that is used for making sure that the balance shaft timing is correct. The pulley does have a timing mark, but the ratio of the pulley to the balance shaft is not 1:1 so a physical check is needed using a screwdriver to make sure things are ready to assemble. Trying to find a positive location of this mystery plug. Attached are the illustrations I found so far on Identifix.

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Randall Owner/Technician
Michigan
Randall Resolution
 

Does this help: youtube​.​com/watch?v=KZHBUC…

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Thanks
David Diagnostician
Georgia
David
 

Randall….. THANK YOU VERY MUCH!!!

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Elon Owner/Technician
North Carolina
Elon
 

I have always lined up the marks on the sprocket and the engine and I have never had an issue. Keep in mind, there is no reason to remove the sprockets as the service info states. I have never understood why they would have you remove them if they are not damaged. Totally unnecessary. I have done at least 10 of these for broken balance belts taking out the crank sensor.

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David Diagnostician
Georgia
David
 

The right hand sprocket is 3:1 to the balance shaft, so you do have a 33% chance of getting it right on the first try. I was not so lucky, so I am doing it again. That video Randall shared is awesome.

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Elon Owner/Technician
North Carolina
Elon
 

The reason for the hole you are looking for is only to hold crankshaft while tightening the sprocket bolt. Again, no need to even remove this sprocket if not damaged.

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David Diagnostician
Georgia
David
   

What about the 3:1 ratio of the right side pulley to that shaft? Without probing the hole, how would you know if you were in phase? (Check out Randall's video link) Yes I am trying to get out of removing the catalytic converter, so please share.

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Elon Owner/Technician
North Carolina
Elon
 

If the timing belt was still intact and you lined up the timing marks at top dead center before removing it. That shaft will be in phase, period. That shaft is driven off the oil pump sprocket. The balance shaft for the other side is 1:1. So, as long as all the timing marks for the actual timing belt are lined up before removing, that shaft has to be in phase unless the timing belt was…

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Elon Owner/Technician
North Carolina
Elon
 

Beyond that, yes, you will have to remove the cat to get the plug out.

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David Diagnostician
Georgia
David
 

Idle vibration. Pretty bad.

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Elon Owner/Technician
North Carolina
Elon
   

Was the vehicle running when you started work on it? These cars are very bad for wearing out engine mounts that cause a lot of vibration, especially at higher milage. Any history on the vehicle might also be helpful. Has the vehicle had vibration for a period of time before the balance belt broke? Those kind of questions. Did you in fact line up all timing marks at #1 cylinder TDC before…

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Stephen Owner/Technician
California
Stephen
 

Did the belt snap? Ive just always used a dab of white out paint to highlight the marks otherwise.

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David Diagnostician
Georgia
David
 

It was removed for Crankshaft position sensor replacement. Little care was taken not to rotate the right balancer shaft pulley at the time, as little was known about the 3:1 ratio. School of hard knocks.

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Elon Owner/Technician
North Carolina
Elon
 

In other words, the timing marks were not lined up at TDC before timing belt removal? Timing belt 101 on a running engine…anyway, yeah, you probably gonna have to remove the cat and bracket. Which is beyond crappy engineering to me, but it is what it is I guess.

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David Diagnostician
Georgia
David
 

Marks were lined up, prior to removal, but the balancer pully was manipulated post belt removal, then put back on the mark prior to belt replacement. Little was known about the 3:1 issue on the right balancer pulley. My 3:1 luck sucks, so I am pulling the inspection plug this time.

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Stephen Owner/Technician
California
Stephen
 

Gotcha, thanks for clarifying.

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Steve Technician
Pennsylvania
Steve
 

This a Mitsubishi engine. Having done many of these, the best way I have found is to roll the forward balance shaft/oil pump sprocket to the mark. If the sprocket stays at the mark and doesn't feel like it wants to roll away from it (forward or back) it is wrong. Roll it 360* and feel it again. If you are in the correct orientation, the pulley will “feel” like it wants to stay on the mark if…

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David Diagnostician
Georgia
David Update
 

Found easier method. Turns out it is not 3:1 but rather 2:1. Here is how you do it without the removal of Catalytic converter. drive​.​google​.​com/file/d/1CWaB_P…

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