odonnell

I tried to install the balance shaft collars (the steel flanged rings that the front oil seals ride on) on my project engine and ran into issues. On the upper B shaft, too tight. On the lower, too loose. These are the same part # (early engine) and I've swapped them with the same results. Brand new from Paragon. Is there are recommended approach here?

I tried putting one in the oven and slipping it over the upper shaft (The one that's too tight) and got nowhere. The lower shaft is loose to the point where the seal would hold the collar still, while the shaft rotated. Any ideas?

Edit: took measurements

Upper shaft OD - 0.919" (23.34 mm)
Lower shaft OD - 0.906" (23.01 mm)

Collar #1 ID: 0.902" (23.91 mm)
Collar #2 ID: 0.911" (23.14 mm)

V2Rocket

Torque the bolt down with the sprocket in place and see if they are loose.

odonnell

Good idea. What to do about the larger shaft? I don't remember how tight the fit is supposed to be.

V2Rocket

Pretty sure the bolt/sprocket/collar combo torqued down will locate everything properly.
Remember the mylar washer behind the collar, that is the oil seal.

odonnell

Mylar seals are in place and all. I'm just not excited about the collar, it gets stuck on the first few millimeters of the shaft even after I get it hot. I'll try returning one and seeing if a replacement fits better.

tempest411

What a strange predicament. I'll be watching this thread for a resolution.

thomasmryan

What are the dimensions on the camshaft sleeve vs the balance shaft sleeve?

Dougs951S

They are the same, the OD of the cam snout is the same as the balance shafts for all year cars.

This thread has more info about seal and race sizes between early and late cars

https://rennlist.com/forums/924-931-...y-vs-late.html

Also, FWIW i measured 8 balance shafts, all the shafts measured between .910" and .912".

odonnell

I took more measurements and it looks like I just got a defective collar. Once I filed down a burr (almost too small to see) on the keyway, one collar was able to slip onto both shafts.