Lost piston pin circlip

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350YPVS
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Lost piston pin circlip

#1 Post by 350YPVS » Mon May 14, 2018 8:25 pm

Hi All,

While rebuilding my engine today I accidentally dropped the piston pin circlip into the crankcase. Just wondering what my options are? Can it stay there, I REALLY do not want to have to split the cases to get it out if I don't have to.

Thx.
J

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T.RexRacing
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Re: Lost piston pin circlip

#2 Post by T.RexRacing » Mon May 14, 2018 8:38 pm

It must be removed if the engine is to survive. Pick one of these magnets up (Harbor Freight,NAPA,ect.) and it'll probably come out. At worst you will remove the engine from the chassis and turn it upside down and shake it.


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Evans Ward
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Re: Lost piston pin circlip

#3 Post by Evans Ward » Mon May 14, 2018 8:53 pm

A borescope would be nice too to investigate. Hope you are able to locate it and remove it without splitting the cases.
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justind97
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Re: Lost piston pin circlip

#4 Post by justind97 » Mon May 14, 2018 9:49 pm

Do NOT leave it in there.

It will lead to a catastrophic failure.

As others have said. Magnet or turn it upside down and shake.


Always, always, always put a paper towel stuffed down around the crank to stop this exact scenario from happening.

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JonW
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Re: Lost piston pin circlip

#5 Post by JonW » Mon May 14, 2018 11:08 pm

i reckon if you turn it upside down you risk it getting in the crank, use a magnet stick as shown above if it will fit, else its strip down time.

This is an advert for using a rag around the piston/rod covering the crankcase opening when doing this work.
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Re: Lost piston pin circlip

#6 Post by Headcoats » Tue May 15, 2018 5:04 am

Should be fairly easy,
From a 4 stroke not so !

Stuff the crankcase mouths with rags next time :-)
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Re: Lost piston pin circlip

#7 Post by hondaror » Wed May 16, 2018 2:26 am

Yup, get it out of there!
Rory

kjellz
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Re: Lost piston pin circlip

#8 Post by kjellz » Wed May 16, 2018 3:39 pm

Try blowing with compressed air and see if it pops out if you cannot get a magnet down there.
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350YPVS
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Re: Lost piston pin circlip

#9 Post by 350YPVS » Wed May 16, 2018 7:17 pm

WooHoo... got it. Picked-up one of the magnetic tools. It JUST fit between the crank journals but boy did the magnet ever want to stay stuck to the crank! I bent the expandable shaft in the process.

Thanks for the advice!
J

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Evans Ward
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Re: Lost piston pin circlip

#10 Post by Evans Ward » Wed May 16, 2018 7:31 pm

Alright!!! Happy for you- now.... stuff those rags on both upper holes before trying to install those circlip!!!
84 RZ350-Toomeys,SCR milled head, stk 26 carbs,300 M, 35 P, stock regrooved needles AS 2.5 turns out,stk air box,Banshee reeds Zeel non-progr CDI,TSRL Program YPVS,alum rad,R6 shock,GV emulators w/RT springs,fork brace,Shindy steering damper.

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T.RexRacing
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Re: Lost piston pin circlip

#11 Post by T.RexRacing » Wed May 16, 2018 9:46 pm

Glad that worked for ya. So let's see the bike!
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hondaror
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Re: Lost piston pin circlip

#12 Post by hondaror » Fri May 18, 2018 4:05 am

Good work!
Rory

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