What's Next? 1965 Bridgestone Sport 90 Engine Seized

[stingray68]

Thank you very much for the info!  I would have to say that one of the biggest lessons I have learned since starting this project is to have patience! I have been reading the manual along the way and am glad to say that even I can follow along.  It is great to have you guys for the experience of actually having done this before.  I will take it slow and keep you all posted on my progress.  Thank you again, Mike

[dcr]

I used a plastic putty knife and tapped it lightly and slowly between the halves to get things moving. As stated previously here - go slow and take your time. Once the main bearings (crank bearings) start to move out of the case halves, it will come apart pretty quickly. Looking at the rusty side you have in the picture, it more than likely that this side will be a little slow to drop out.

I would suggest you have that side down as the transmission is less likely to come apart if you take the left side off of the right side. Here is a picture of a 50 sport motor which is pretty much the same configuration as your 90.

Dan

[mqtsteve]

FYI,
I just got an Armstrong 2 1/4" Face Spanner from eBay.  It's the perfect tool for the "sprocket stopper".  It fits the 14 tooth front sprocket on BS90's.  The handle is long enough to rest on the crankshaft while torquing the nuts.  Here's a link to the tool.  There's a large price range.  I only paid $5.  Just an option, Steve
http://m.ebay.com/itm/Armstrong-2-1-4-in-Face-Spanner-Wrench-Heat-Treated-for-Greater-Strength-/321975659322?hash=item4af73eab3a%3Ag%3A3pwAAOSwFqJWlwMB&_trkparms=pageci%253A980bd468-3014-11e6-8a13-74dbd180b8af%257Cparentrq%253A4130dbc11550a6a8cb43dd6afffef29d%257Ciid%253A1

[stingray68]

Awesome....Thanks Steve. If I don't find one at a better price I'll pick that up.  Check out the pics below.  I was able to get the gearbox split and what a rusty mess the crankshaft is.  Piston skirt is broken.  Not sure what this guy did to this bike, but wow!!  Anyhow, what do you all think about this situation.  Should the crankshaft pull easily through the gearbox half? This one seems to be stuck.  Probably rusted. What do you think? Do I replace the crank halves? Bead blast these?  As usual thank you for your input....Mike

[mqtsteve]

Mike,
It looks like it may take a shop press to remove the crankshaft from case.  The crank halves might be usable.  The rust can be removed.  Try "Metal Rescue" or "Evaporust" they remove rust without damaging the base metal.  You will need new main crank and conrod bearings!  You could probably find a used crank on eBay.  Good luck, Steve

[stingray68]

Hello Everyone,

   Well sadly the Bridgestone engine rebuild has taken the back burner to other projects, but I am looking to continue shortly.  My next issue is removing the crankshaft and bearing from the housing.  Right now the bearing is rusted to the right side of the housing.  Does anyone have any good suggestions on how to remove the bearing and crankshaft?  My arbor press is not deep enough and I do not want to damage the crankshaft.  As usual....Any and all help is greatly appreciated.  Thank you, Mike

[slawsonb]

Not exactly sure what you are describing, but if the bearing is rusted between the outer surface of the bearing and the aluminum housing (essentially expanding to wedge the bearing in the opening in the housing), then soaking it in some penetrating oil might loosen it enough to allow it to be extracted.
...bert

[grundlegrabber]

God that looks awful. I've got a 90 engine I don't need, would let it go cheap if you want it.

[slawsonb]

Right on! Members helping members! I love it! Nice going grundlegrabber!
...bert

[stingray68]

I honestly don't know what I would have done without the help of the members of this site. Thanks to all you guys!....Mike

[grundlegrabber]

Its all about keeping the old bikes going. Every one that gets fixed up is one less that was lost to the ages. Sharing knowledge & parts among members is so important to the survival of the species. So many times I would have been stuck without the help of others. Always try to pay it forward when I can.