Balance shaft eliminator question

[jasonlee]

I am just wondering if anybody else has ever run into this problem...

I am putting together an engine for a guy that I am doing an awd conversion on his dodge avenger... 4g63 6 bolt originally non turbo block...

now I am putting in the balance shaft bearings turned 180 degrees to block off the oil passages. well, the one that goes deep inside the engine is too small. it just goes right on through the opening without even feeling like it is close to tight. the other fit right in like its supposed to.

I have done this a couple other times with no issues whatsoever. just wondering if the 6 bolt and 7 bolt engines had different sized balance shaft bearings or what the issue could be. any ideas?

thanks!

 

[GVR4592]

They are the same between 6 bolt and 7 bolt. The front and rear are different diameter though, one of them is 44mm the other is 45mm. I don't remember if the bigger one goes in the front of back. I'll check.

 

[GVR4592]

I think the 44mm and 45mm might be incorrect, but they are definitely different sizes. The front is larger and the rear is smaller. Which doesn't really make much sense in your situation, if you are having trouble with the bearing being to small in the rear. Did the bearings seperate at all when you pulled them out of the block? Sometimes the little fingers come apart and cause all kinds of problem.

 

[jasonlee]

I actually have tried like 4 or 5 different bearings now... from different core engines, and 2brand new sets.

the bigger one actually gets somewhat close to fitting, but i know its supposed to be the smaller one.

I think I am gonna try to slim down a bigger one slightly and see if I can get it to work that way. I dont know what else to do.

 

[jasonlee]

well, I had to shave a few thousandths off with some sand paper, and taper the edge a bit more, but I got the bigger bearing to fit in there. I am guessing the old bearing went out and the balance shaft opened the hole up a bit larger than it was supposed to be...

well, its done now and the engine is almost done... just waiting on the head from the engine shop. man I cant wait to finish this car and get back to my own!

J

 

[bigjdog84]

For the record, you can drill and tap the oil passage if you cannot get the bearing in. Just remove the set screw plug out of the front of the block, drill and tap to the correct size. Then you can just thread a bolt into place (fitting it to size and applying locktite of course)

 

[project_tsi]

For the record, you can drill and tap the oil passage if you cannot get the bearing in. Just remove the set screw plug out of the front of the block, drill and tap to the correct size. Then you can just thread a bolt into place (fitting it to size and applying locktite of course)

I was just going to recomend doing this. This works well if you want a $1 BSEK, or if the old bearing seems to have spun in your situation. Like you said, unscrew the small set screw from the front of the block, and then run the same size tap as the screw, into the oil passage that feeds the BS, using loctite.

I haven't done this method myself, but I thought of if one day, and have recomended it to several people and they have had great results.

 

[AndrewD5418]

Hate to bring back a dead thread but has anybody figured out what type of thread is that screw plug? It doesn't seem to be metric. Also, it's a 21mm freeze plug correct?