Crankshaft removal and installation

[Andreas Piepke]

Hi All,

I am working on a 1973 Hare Scrambler. Do people have the crankshaft removal tool (shown in figure 74 of the repair manual, the tool to press the crank out of the outer bearing) and/or the crank bearing insertion tool and the extractor for the inner crank races? Without these tools the only way I see to remove the crank shaft is to shim the crank and drive it out with a rubber hammer. Do people have experience with this? It would be great if I could borrow or rent these tools from someone. Can these tools or their equivalent be bought somewhere?

Thanks!

Andreas

[Mickey Sergeant]

I heat the cases around the bearing with a heat gun. when case expands tap out with a deadblow hammer. make sure to have nut on threaded ends so you don't damage threads

[Andreas Piepke]

Mikey, thanks for the advice. The crankshaft is pressed into the inner race of the outer left side bearing. The bearing comes out to the left, the crank to the right side. Heating the crank housing won't expand the bearing's hold on the crankshaft. I can see how heating helps remove the bearings but not the crankshaft.
Is there any wisdom out there how to do that without the use of a hammer? I am afraid to damage the crank in the process. Well, worst case I'll shim the crank and use The deadblow hammer as described by Mikey.

Thanks again!

Andreas

[Keith Meatyard]

I know this is howw to do the 175's, and I think the 250's are the same: If you are describing getting the crank out of the ball bearing under the primary drive gear, first pull the primary gear off the crank using a jaw puller.  Then, support the case on the parting surfaces resting on a pair of bars on a small press, with the crank hanging down between the support bars.  Press downward on the very outboard end of the crank, and the crank will fall out when pushed passed the fit of the ball bearing inner race.  The balls and cage of the 3 piece crank support bearings can be just pryed off the inner races with a pry bar.  Next use a bearing splitter with it's jaws biting into the middle of the inner race, suport the spliter on the support bars, and press on the end of the crank and the inner race will pop off.

Keith Meatyard

[Andreas Piepke]

Keith,

I just tried your method. The crank came out easily and without any problems. I used a little hand press. Thanks for the tip!

Andreas

[Andreas Piepke]

Hi Keith,

Removal of the inner race of the crank bearing worked well too. Here a photo of the procedure:
http://s1341.photobucket.com/user/andreas_g_piepke/media/Penton/100_3047_zps95327549.jpg.html?sort=3&o=4

The expensive original tool isn't needed.

Andreas

[Keith Meatyard]

Bingo, works everytime.  Glad it worked OK.

Keith Meatyard

[Rain Man]

Now that you got the crank out of the cases, you can tap that bearing out of the clutch side case fairly easy. Great.
Now after you set the crank bearings  and assemble the lower end, how do you press that bearing back on without the special tool?
  Also Gary Ellis sold me a home made tool awhile ago  for pressing the crank out of the clutch side case, and it works slick as polished March ice!!
 Now what do you guys use to install that bearing once the lower ends together?
  Anybody have a tool they want to sell me or an idea?


Raymond
 Down East Pentons

[Andreas Piepke]

Hi Raymond,

I used a press with support of the crank and the housing to get the new bearing in.

Cheers

Andreas

[skiracer]

Andreas and Keith, thanks for the detailed info!

1976 MC 5 Original Owner
1982 Suzuki PE 175
1976 Penton 175 XC
1979 KTM 175 GS