Webra 145 SS bearing

[brianyemail-nsrca at yahoo.com]

How do you get the piston/rod reassembled if you remove this way?

Rcmaster199 at aol.com wrote:It isn't necessary to first disassemble the piston and rod. After removing the sleeve, move the piston to near TDC, slip an allen wrench behind the rod and work it off the crank pin. Rock the crank slightly and the rod will come off the pin. BUT, if you can't do that for some reason, then proceed with what Keith says.
 
One thing that should not be done is to tap the bearing races to seat the bearing. Tapping the wrong race will oftern score the balls and will cause premature bearing failure. 
 
MattK
The biggest trick on the Webra 1.45 is removing the wrist pin from piston in order to remove the connecting rod. If you never done this it's helpful to know the following trick. 
 
Remove the sleeve and position the piston so the wrist pin can be seen through the exhaust port. You'll see a wire retaining clip that seats into a groove in the wrist pin hole. This clip keeps the wrist pin from slipping out. Use pliers to remove this wire clip. Then take one of the bolts that are used to hold the head on the motor and thread that bolt into the end of the wrist pin. This will allow you to pull the wrist pin out. Hope that was clear, it's really better to demonstrate.
 
Also, to add to what Don said, before putting the crank case in the oven remove all other components including the carburetor and the crank shaft from the crank case. Then when putting the bearings back in I always slide the bearings onto the crank shaft first and then take the heated crank case out of the oven and use the crank shaft to slide the bearings in place. This helps keep them from getting in there a bit crooked. But I guess there's more than one way to skin the proverbial cat.
 
Keith
----- Original Message ----- 
From: Don Szczur 
To: discussion at nsrca.org 
Cc: NVRC-List at yahoogroups.com 
Sent: Sunday, October 17, 2004 8:49 PM
Subject: Re: Webra 145 SS bearing


Randy, you must not have gone through home-ec in high school.  
 
Put the crankcase in the oven, bake it for 15 minutes on 250. 
 
While the engine is baking, put the new set of bearing on ice and let them marinate at 32 degees or so in the freezer- 10 minutes should work.
 
Don't forget to use your oven mits when you take the crankcsase out.
 
Pull out the bearings with a pair of needle nose pliers.  Put the engine back in the oven and bake for another 15 minutes.
 
Pull out of the oven, take the bearings out of the freezer, and slip them in. You should hear them go Flop.  And slip right in and seat at the front of the crankcase.
 
Sip a glass of hot chocolate as the engine cools down.  Re assemble.  Fly.
 
Don
 
----- Original Message ----- 
From: Randy 
To: discussion at nsrca.org 
Cc: Don Szczur ; NVRC-List at yahoogroups.com 
Sent: Sunday, October 17, 2004 7:02 PM
Subject: Webra 145 SS bearing


The new SS bearing came in from the freindly bearing maker.  They look really nice.  So how hard is it to change the rear bearing in a Webra145?
 
 
Randy


 

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