Wildguzzi.com

General Category => General Discussion => Topic started by: sparrowhawwk on July 10, 2015, 06:24:49 PM

Title: 76 Convert small end bushing install?
Post by: sparrowhawwk on July 10, 2015, 06:24:49 PM

Got a new small end bushing from MG Cycle today.  This replacement part has a slit across one side and no oil holes pre-drilled so never having done this before I could use a little advice.  Should I align the slit with the two inner holes and drill out the 4mm end hole after installation?  I have a ream coming for final sizing after installation.   :undecided:  ???????????

Title: Re: 76 Convert small end bushing install?
Post by: mtiberio on July 10, 2015, 10:03:22 PM

Same size as a VW. I take them to machine shops

Title: Re: 76 Convert small end bushing install?
Post by: racasey on July 11, 2015, 04:12:56 AM

I have a sense that you intend to replace the small end bushing and ream it while the rod is still in the engine.  This will quickly become a disaster.  You will not be able to hold alignment, and hand reaming will not maintain the necessary tight tolerances demanded for the wrist pin in the piston.

Mtiberio's advice was very sound, take it to an auto machine shop.

Ciao,
Dick

Title: Re: 76 Convert small end bushing install?
Post by: sparrowhawwk on July 11, 2015, 11:26:50 AM

I appreciate your concerns but I have a full machine shop at my disposal.  The thing is not having done this before I need to know where I should position the slit in the bushing I received from MG Cycle.  Just trying to get a jump on getting this done without having to wait until next week to get the info.   

Title: Re: 76 Convert small end bushing install?
Post by: mtiberio on July 11, 2015, 12:53:18 PM

slit is on the outside? I'd align it where the hole in the rod is, and then drill after you press it in before honing. this will give 3 paths for oil to get to the pin.

Title: Re: 76 Convert small end bushing install?
Post by: sparrowhawwk on July 11, 2015, 02:57:14 PM

Thanks.  I was leaning toward doing that but wasn't sure.  Now to get the sidecar off and the bike on the lift and dismantle. LOL 

Title: Re: 76 Convert small end bushing install?
Post by: mtiberio on July 11, 2015, 03:05:03 PM

of course to get the rods out, you do not have to crab the frame. just drop the oil pan and pull the heads.

Title: Re: 76 Convert small end bushing install?
Post by: sparrowhawwk on July 11, 2015, 04:25:50 PM

Got that.  Been playing with taking my spare motor apart first.  Need an oil change anyway.  :grin:

Title: Re: 76 Convert small end bushing install?
Post by: sparrowhawwk on July 18, 2015, 11:59:00 AM

Pulled the cylinder off and the wrist pin out.  Cylinder wall perfect.  Piston skirts no wear marks.  Wrist pin bushing looked fair but wrist pin worn in center.  Due to time limits due to upcoming trip decided to do the "redneck" fix for now.  Put in a much better condition pin from my spare motor I have apart without changing the bushing.  Motor is much quieter now so it worked for the short term.  I intend to do a complete rebuild this winter.  :thumb: