Changing the two Crankshaft bearings

G1 Dennis · 01-23-2017, 08:37 PM

I just bought a G1 and the engine needed overhauled.. I am going back together with new two bearings.. Do I put the press bearings on the crankshaft first or in the case? I am confused,, I seen different older post doing it either way. Which is best, I have access to a press and hot/cold methods.
Thanks in advance!

Spicyunicorn · 01-23-2017, 08:52 PM

You're going to hear people say both ways but I prefer doing crank first that way you can see the bearing is seated where it needs to be and "press" on the inside race and not put a side load on bearing then just freeze the crank and warm the case and the case half's will go together fairly easy

G1 Dennis · 01-24-2017, 09:21 AM

Thanks, I got bearings ordered!

Spicyunicorn · 01-24-2017, 12:03 PM

Also apply two stroke oil in all bearings and cylinder and piston sides when going back together

G1 Dennis · 01-25-2017, 06:00 PM

How did you heat your cases? Are you talking really hot? Its my next step! Did you use special sealant, between the two case halves?

Thanks again!

Spicyunicorn · 01-25-2017, 10:13 PM

Grill or oven works best you don't have to get it's real hot if you have the case around 150-200 and bearings froze it should go together fairly easy IV always used an aerobic sealant on the case halves just make sure you don't use to much that is spews to the inside when the halves are pressed together

G1 Dennis · 01-26-2017, 07:33 PM

I heated the crank shaft case halves in the oven 250 F for about 25 min.. The pieces literally fell together on the frozen crankshaft and bearings. No hammering or pressing at all. Totally amazing!

Spicyunicorn · 01-27-2017, 09:47 AM

All down hill from there the rest is a peice of cake make sure to premix first tank at 100:1 if still using oil injection

G1 Dennis · 01-27-2017, 05:21 PM

I still use oil injection... what oil should I use for the injection? The 100-1 is the first tank of fuel? I wasn't aware of that.

G1 Dennis · 01-27-2017, 06:41 PM

What size of rubber hose is that from the engine case to the carburetor? 1/4 or 5/16 ? My fuel line from the tank to the pump is rotted I was going to pick up some! The gear case vent line is rotted off,, can the hose be changed,,,, what size is that?

01-23-2017, 08:37 PM	#1
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12	Changing the two Crankshaft bearings I just bought a G1 and the engine needed overhauled.. I am going back together with new two bearings.. Do I put the press bearings on the crankshaft first or in the case? I am confused,, I seen different older post doing it either way. Which is best, I have access to a press and hot/cold methods. Thanks in advance!
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12

01-23-2017, 08:52 PM	#2
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: Changing the two Crankshaft bearings You're going to hear people say both ways but I prefer doing crank first that way you can see the bearing is seated where it needs to be and "press" on the inside race and not put a side load on bearing then just freeze the crank and warm the case and the case half's will go together fairly easy

01-24-2017, 09:21 AM	#3
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12	Re: Changing the two Crankshaft bearings Thanks, I got bearings ordered!
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12

01-24-2017, 12:03 PM	#4
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: Changing the two Crankshaft bearings Also apply two stroke oil in all bearings and cylinder and piston sides when going back together

01-25-2017, 06:00 PM	#5
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12	Re: Changing the two Crankshaft bearings How did you heat your cases? Are you talking really hot? Its my next step! Did you use special sealant, between the two case halves? Thanks again!
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12

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01-25-2017, 10:13 PM	#6
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: Changing the two Crankshaft bearings Grill or oven works best you don't have to get it's real hot if you have the case around 150-200 and bearings froze it should go together fairly easy IV always used an aerobic sealant on the case halves just make sure you don't use to much that is spews to the inside when the halves are pressed together

01-26-2017, 07:33 PM	#7
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12	Re: Changing the two Crankshaft bearings I heated the crank shaft case halves in the oven 250 F for about 25 min.. The pieces literally fell together on the frozen crankshaft and bearings. No hammering or pressing at all. Totally amazing!
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12

01-27-2017, 09:47 AM	#8
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: Changing the two Crankshaft bearings All down hill from there the rest is a peice of cake make sure to premix first tank at 100:1 if still using oil injection

01-27-2017, 05:21 PM	#9
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12	Re: Changing the two Crankshaft bearings I still use oil injection... what oil should I use for the injection? The 100-1 is the first tank of fuel? I wasn't aware of that.
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12

01-27-2017, 06:41 PM	#10
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12	Re: Changing the two Crankshaft bearings What size of rubber hose is that from the engine case to the carburetor? 1/4 or 5/16 ? My fuel line from the tank to the pump is rotted I was going to pick up some! The gear case vent line is rotted off,, can the hose be changed,,,, what size is that?
G1 Dennis Not Yet Wild Join Date: Jan 2017 Posts: 12

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