87' 2PG Crankshaft Bearing Install ?

EZGOnSAVAGE · 02-11-2011, 10:45 AM

I just purchased a total rebuild kit (i.e. crankshaft, bearings, piston, rings, cylinder, etc. etc.) for my 1987 EZGO 2PG motor. I'm looking for tips on how to install the new bearings. I put the bearings in my freezer overnight and then heated the engine case(s) slightly with my torches and the bearings installed real easy into the cases. The problem now is how do you put the cases together with the new crankshaft. The crankshaft is .004 larger than the inside diameter of the bearing so it's not simply a matter of assembling and pulling together with the engine case bolts. Any help would be greatly appreciated. Thanks.

Dave Box · 02-11-2011, 11:18 AM

I have heard the freezer / oven scenario before and it has never worked for me. What did work was taking the crankshaft and bearings to a machine shop and getting them pressed onto the shaft for $5. I then reassembled the crankcases and the crankshaft. As the bearings are an interference fit it was necessary to GENTLY tap them together with a rubber mallet until the 5 bolts would engage and then wind them together with the bolts in a criss cross pattern. Don't forget to apply some mastic between the cases, I like Mega Grey.
Dave

EZGOnSAVAGE · 02-11-2011, 11:29 AM

I may have to go that route. In my mind it was a toss-up which side to press in first, the cases or the crankshaft. I'm still brainstorming on this and if I don't come up with any other ideas I will go with your advice. Thanks for your input. Also, should these bearings be packed with bearing grease or not ? Thanks again.

Dave Box · 02-11-2011, 11:48 AM

You're welcome. Don't pack them with grease as the grease will block the gasoil getting to them. Dose everything up liberally with 2 stroke oil and be prepared for a smoke out when she first fires up
Dave

mikeevans860 · 02-11-2011, 01:31 PM

I need to re-build mt 87 2pg. I am going to be following you on here so please keep posting and post some pictures if you can. And your not in California are you?

Ninjaneer · 10-03-2013, 06:44 AM

If the crank shaft has an interference fit with the bearing how do you assemble to check for axial play. There is a shim washer stack-up that goes on the shaft, so how do you pick the number of shim washers to use? If they were a slip fit I would plan on starting with no shim washers -> assemble-> check play-> disassemble-> add washer-> assemble -> check -> and so on

02-11-2011, 10:45 AM	#1
EZGOnSAVAGE Not Yet Wild Join Date: Jan 2011 Location: Lake of the Ozarks, Mo. Posts: 10	87' 2PG Crankshaft Bearing Install ? I just purchased a total rebuild kit (i.e. crankshaft, bearings, piston, rings, cylinder, etc. etc.) for my 1987 EZGO 2PG motor. I'm looking for tips on how to install the new bearings. I put the bearings in my freezer overnight and then heated the engine case(s) slightly with my torches and the bearings installed real easy into the cases. The problem now is how do you put the cases together with the new crankshaft. The crankshaft is .004 larger than the inside diameter of the bearing so it's not simply a matter of assembling and pulling together with the engine case bolts. Any help would be greatly appreciated. Thanks.

02-11-2011, 11:18 AM	#2
Dave Box Respect the Cart Join Date: May 2010 Location: Rocky Mount, Virginia Posts: 2,190	Re: 87' 2PG Crankshaft Bearing Install ? I have heard the freezer / oven scenario before and it has never worked for me. What did work was taking the crankshaft and bearings to a machine shop and getting them pressed onto the shaft for $5. I then reassembled the crankcases and the crankshaft. As the bearings are an interference fit it was necessary to GENTLY tap them together with a rubber mallet until the 5 bolts would engage and then wind them together with the bolts in a criss cross pattern. Don't forget to apply some mastic between the cases, I like Mega Grey. Dave

02-11-2011, 11:29 AM	#3
EZGOnSAVAGE Not Yet Wild Join Date: Jan 2011 Location: Lake of the Ozarks, Mo. Posts: 10	Re: 87' 2PG Crankshaft Bearing Install ? I may have to go that route. In my mind it was a toss-up which side to press in first, the cases or the crankshaft. I'm still brainstorming on this and if I don't come up with any other ideas I will go with your advice. Thanks for your input. Also, should these bearings be packed with bearing grease or not ? Thanks again. Last edited by EZGOnSAVAGE; 02-11-2011 at 11:31 AM.. Reason: added more info

02-11-2011, 11:48 AM	#4
Dave Box Respect the Cart Join Date: May 2010 Location: Rocky Mount, Virginia Posts: 2,190	Re: 87' 2PG Crankshaft Bearing Install ? You're welcome. Don't pack them with grease as the grease will block the gasoil getting to them. Dose everything up liberally with 2 stroke oil and be prepared for a smoke out when she first fires up Dave

02-11-2011, 01:31 PM	#5
mikeevans860 Gone Wild Join Date: Nov 2010 Location: Corona California Posts: 168	Re: 87' 2PG Crankshaft Bearing Install ? I need to re-build mt 87 2pg. I am going to be following you on here so please keep posting and post some pictures if you can. And your not in California are you?

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10-03-2013, 06:44 AM	#6
Ninjaneer Not Yet Wild Join Date: Aug 2013 Posts: 32	Re: 87' 2PG Crankshaft Bearing Install ? If the crank shaft has an interference fit with the bearing how do you assemble to check for axial play. There is a shim washer stack-up that goes on the shaft, so how do you pick the number of shim washers to use? If they were a slip fit I would plan on starting with no shim washers -> assemble-> check play-> disassemble-> add washer-> assemble -> check -> and so on
Ninjaneer Not Yet Wild Join Date: Aug 2013 Posts: 32

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