G1 case seperation and bearing replacement

[mikeasis]

Needing some advice on splitting the crank case my G1 and R+R the crank bearings.I think someone mentioned putting the bottom end in the oven on a low temp for a period time or using a heat gun. Tips for disassembly and assembly much appreciated.

[cgtech]

What type of puller apparatus do you plan to use? BFH is the answer I hope you don't plan on...

[mikeasis]

Originally Posted by cgtech

What type of puller apparatus do you plan to use? BFH is the answer I hope you don't plan on...

from the looks of the service manual the puller looks like a standard bar puller at the same time the pics aren't very clear, atleast in the manual I have. I have a bunch of different styles of pullers just hoping I have one that will work.

even if I get it separated I still have to be able to reinstall it

[dezrcr822]

IMHO the only way to do this is with an engine case splitter and a crank puller/installer tool. I use Tusk brand and both can be had for a little over $200.00. They will pay for themselves the second time you use them.

I use a single burner hot plate, coil style, to remove and install crank bearings. Once case has been split set case half on plate and heat until about 230°F or so and the bearing will either drop out or have to be lightly tapped out. To install the heat/freeze method works best. Place bearings in freezer preferably over night or at least for a few hours. Heat up case half to 230°F again and drop frozen bearing in. Keep a bearing installer tool nearby as you may have to tap bearing in if it does not drop in by itself then set it aside and allow it to completely cool before handling again. Also be sure bearing is facing correct way before installing.

Pull crankshaft into engine case with crank puller from the magneto side making sure connecting rod is not hitting case while installing, the clutch side case should go on by hand. Use Yamabond sealant on case halves and tighten case bolts to spec.

I would not use the wifes oven to heat cases as there could be a potential for explosion.....from the wife.

[mikeasis]

Originally Posted by dezrcr822

IMHO the only way to do this is with an engine case splitter and a crank puller/installer tool. I use Tusk brand and both can be had for a little over $200.00. They will pay for themselves the second time you use them.

I use a single burner hot plate, coil style, to remove and install crank bearings. Once case has been split set case half on plate and heat until about 230°F or so and the bearing will either drop out or have to be lightly tapped out. To install the heat/freeze method works best. Place bearings in freezer preferably over night or at least for a few hours. Heat up case half to 230°F again and drop frozen bearing in. Keep a bearing installer tool nearby as you may have to tap bearing in if it does not drop in by itself then set it aside and allow it to completely cool before handling again. Also be sure bearing is facing correct way before installing.

Pull crankshaft into engine case with crank puller from the magneto side making sure connecting rod is not hitting case while installing, the clutch side case should go on by hand. Use Yamabond sealant on case halves and tighten case bolts to spec.

I would not use the wifes oven to heat cases as there could be a potential for explosion.....from the wife.

would happen to have the part numbers for those tools? edited: this set here or are there different applications/ sets? I could probably get by without the crank case splitter but with the price of that combo I may just get the set.
https://www.ebay.com/p/Tusk-Crankcas...2690763&chn=ps

[dezrcr822]

Yes those are the ones I use, good price too. Ive done my cart engine all the way up to a KTM 300 we will race in the Mint 400 and every motor I have inbetween. Pulling in the crank I had to get creative with crossbars due to such a small crankcase on the cart but it was no big deal. Been doing lots of bottom end work lately and no more dropping engine off, waiting and paying plus you know it is done right.

[mikeasis]

Originally Posted by dezrcr822

IMHO the only way to do this is with an engine case splitter and a crank puller/installer tool. I use Tusk brand and both can be had for a little over $200.00. They will pay for themselves the second time you use them.

I use a single burner hot plate, coil style, to remove and install crank bearings. Once case has been split set case half on plate and heat until about 230°F or so and the bearing will either drop out or have to be lightly tapped out. To install the heat/freeze method works best. Place bearings in freezer preferably over night or at least for a few hours. Heat up case half to 230°F again and drop frozen bearing in. Keep a bearing installer tool nearby as you may have to tap bearing in if it does not drop in by itself then set it aside and allow it to completely cool before handling again. Also be sure bearing is facing correct way before installing.

Pull crankshaft into engine case with crank puller from the magneto side making sure connecting rod is not hitting case while installing, the clutch side case should go on by hand. Use Yamabond sealant on case halves and tighten case bolts to spec.

I would not use the wifes oven to heat cases as there could be a potential for explosion.....from the wife.

did you use any certain type of single burner hot plate? I see the RV style but not sure if they will get hot enough. Ive used one before to heat up cam gears on International/Navistar diesel engines but I don't recall what type our shop had for that.

[dezrcr822]

This is a wallyworld special at like $7.00. It takes 8 to 10 minuets or so to get to around 230°checking with a temp gun aimed at crank journal.

[Golf cart guy]

Im the oven guy. That's the only way I have done them. It will tap apart. Obviously, clean it first before you put it in the oven, but works great.

[mikeasis]

Originally Posted by dezrcr822

Yes those are the ones I use, good price too. Ive done my cart engine all the way up to a KTM 300 we will race in the Mint 400 and every motor I have inbetween. Pulling in the crank I had to get creative with crossbars due to such a small crankcase on the cart but it was no big deal. Been doing lots of bottom end work lately and no more dropping engine off, waiting and paying plus you know it is done right.

ordered that tool set as ive got 2 engines lined up to do. ill pick up the burner when I get those.