Changing a piston - Snowmobile Forum: Your #1 Snowmobile Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 02-10-2005, 01:47 PM Thread Starter
Registered User
 
Join Date: Feb 2005
Location: Burlington
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Changing a piston

I have never taken a piston off the piston rod. Can someone explain the method to remove the piston.

Thanks
jaguar 79 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 02-10-2005, 03:28 PM
four gear pinned
 
sesnopro's Avatar
 
Join Date: Aug 2004
Location: southren mn
Posts: 1,991
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
once you get the pistion totaly exposed,(out of the cylinder). there will be two C clips on each side of the pistion rod. pry them out, be carefull they will fly all the way accrost your shop if they spring out. next you have to get the pistion rod out, some times they go easy others they dont. there is a tool to get them out, other wise use a big punch. next you will need to hone the cylinder, hone them by using a cross-hatch pattren, use a even motion and you should end up with a even patteren. then assemble your pistons, make sure the rings are in the right spot and facing the right direction,( up or dowm there will be a marker). put the piston on the connecting rod and pust the piston rod through,( dont forget the bering). then install the c clips, be carfull they are very easy to lose. after this compress the rings with your fingers and and slide the piston onto the cylinder. make sure there the rings are seated with the open section on the ring pin. rember to coat the pistons and cylenders with some injection oil before reassembly. torque the head bolts and fill with coolant.

http://www.hiperf.com/
http://www.studboytraction.com/
sesnopro is offline  
post #3 of 8 (permalink) Old 02-10-2005, 03:35 PM Thread Starter
Registered User
 
Join Date: Feb 2005
Location: Burlington
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the answer, it sure helps
jaguar 79 is offline  
post #4 of 8 (permalink) Old 02-10-2005, 10:03 PM
Registered User
 
nwicomputerguy's Avatar
 
Join Date: Dec 2004
Location: Valparaiso, IN
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
wrist pin puller

Can get puller from shadtreesnowmobile for $20 + shipping. But it you dont want to spend the money, WD-40 (or liquid-wrench) and a punch or a socket (smaller than OD of wrist pin) and extension will do. Use a rubber mallet and dont tap too hard or youll bend the connecting rod - BAD!!!! You can put a block of wood between the connect rod and the cyl pins to counteract the pounding and hold the piston still.

20 + shipping may be worth it - was for me.

I'm a computer geek and I just re-did my 503 and believe it or not it ran on the initial start. SO if I can do it...

good luck
nwicomputerguy is offline  
post #5 of 8 (permalink) Old 02-11-2005, 02:57 AM
-LIFETIME MEMBER-
 
Viktory2k1's Avatar
 
Join Date: Feb 2005
Location: Waukesha, Wisconsin
Posts: 335
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
get the tool. keep the c-rings on a magnet until use. Account for each one and where they go.
Heres a thought that went through my mind while changing a piston drunk(many moons ago).
"I swear this kit came with 2 c-clips. hmmmm. Now that I think of it, there might have been only one". I took the one out of the other kit, put the piston on and on my first ride(100 feet or so).
I found the missing c-clip. It was in the crankcase!
Bad noise but at least I knew where it was.
$1000 later, the sled ran fine.
This was 15 years ago. I cant imagine what would happen with todays stuff.
Someday, I will tell the "flying needle" story.
Viktory2k1 is offline  
post #6 of 8 (permalink) Old 02-13-2005, 11:35 PM
Registered User
 
600SE's Avatar
 
Join Date: Jan 2005
Location: Live in NJ, ride in NY
Posts: 271
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yep, basicly what they said, you pry that little clip on the side out then just slide that short "rod" (forget what its called )out and take the rod out

-85 Indy trail
-85 Indy 600SE
-89 Indy 650
-68 Super olyimpic
600SE is offline  
post #7 of 8 (permalink) Old 02-16-2005, 04:28 PM
Super Moderator
 
BC_Dan's Avatar
 
Join Date: Jan 2004
Location: oregon
Posts: 13,385
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
The short "rod" is the wrist pin. It should have needle bearings on it. Some bearings are caged and some are loose. The loose ones will also fall into the crankcase and end up like the C-clip that Viktory2k1 had fall, so be careful!

On some stubborn wrist pins, in the absense of a puller, remove one of the c-clips from the piston. Take a threaded rod and slide it through the wrist pin. Put a small nut no larger than the wrist pin opposite the side that the c-clip came off. Take a large, deep socket, bigger than the wrist pin, and slide it onto the threaded rod. Put a washer and nut on the "socket" end and tighten the nut. As you tighten the nut at the socket end, the nut at the other end will pull the wrist pin into the deep socket.

If the piston has been overheated and is damaged, you may not be able to get it out using this method and a puller will be required. If it's just being a little stubborn, it's a cheap "puller" you make with things you probably already have in the shop.

2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
BC_Dan is offline  
post #8 of 8 (permalink) Old 02-17-2005, 03:43 AM
-LIFETIME MEMBER-
 
Viktory2k1's Avatar
 
Join Date: Feb 2005
Location: Waukesha, Wisconsin
Posts: 335
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I swear, someone planted it. It wasn't me!
hehehe
Viktory2k1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Snowmobile Forum: Your #1 Snowmobile Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome