Author Topic: Piston Problem (Read 4111 times)

blackSR5 · « **on:** Nov 09, 2010, 10:46:04 AM »

So I have a dune buggy as my DD and the other day i Seized the engine...

...so i am tearing it apart to rebuild it but I cant seem to get the piston off. I have hit it with a hammer a few times but just cant get it to budge. I dont want to hit it too hard for the fact that I dont want to bend the rod. Any ideas??

yota4x4sc · « **Reply #1 on:** Nov 09, 2010, 12:21:05 PM »

did u take the cir clips off? if it dont have any its gonna have to be pressed off...dont hit it!!!!!

blackSR5 · « **Reply #2 on:** Nov 09, 2010, 12:39:46 PM »

Yeah took those off...that is what I was thinking. Just rying to do it the inexpensive way first...without breaking anything.

BoG-ToY · « **Reply #3 on:** Nov 09, 2010, 03:42:04 PM »

bolt and socket being careful not to mar the skirt? get a bolt that will fit through the pin, and DEEP socket that the pin will fit in.... tighten it down (if you have it, stick a piece of leather or tag board to prevent the socket from marring the skirt

If this helps, please +1 turtle points for me, Im trying to get those out of the negative

79coyotefrg · « **Reply #4 on:** Nov 09, 2010, 05:38:00 PM »

did you pull the pan and unbolt the connecting rod??

BoG-ToY · « **Reply #5 on:** Nov 09, 2010, 05:49:09 PM »

that picture appears to be a motorcycle type engine, if so there is a good chance the rod does not unbolt from the crank, if that kind of work needs to be done, the pin get pressed out of the crank, and then has to be properly aligned with a jig to re-install the crank pin.
I seems like he is looking to pull the piston off the connecting rod, otherwise I dont see him pulling the wrist pin clips to complete this task,

79coyotefrg · « **Reply #6 on:** Nov 09, 2010, 06:15:58 PM »

ok you got me, i thought it might have been a VW type engine

BoG-ToY · « **Reply #7 on:** Nov 09, 2010, 06:20:22 PM »

I dont know, his picture shows a cam chain, and its a single cylinder we are seeing? with no paired cylinder,
Also, i see what appears to be a clutch or stator housing at the end of where the crankshaft would be?

yota4x4sc · « **Reply #8 on:** Nov 10, 2010, 01:39:42 AM »

bog ill hook u up wit points when ever i see ur name..

blackSR5 · « **Reply #9 on:** Nov 10, 2010, 02:03:55 PM »

Yeah it is a gokart. Single cylinder. The person that rebuilt it before me did a horrible job. The first thing I did when I couldn;t get the piston off was to crack the case and take the rod off...well BOG...your right it wont come off. Im thinking that I need to take it to a machine shop and have them press it off. SHouldnt be too much work for them. I hope they dont charge me too much. Thanks for the help!!

BoG-ToY · « **Reply #10 on:** Nov 10, 2010, 02:20:39 PM »

make sure its a shop that is into motorcycles. as proper alignment is critical when they put it back together... is there a reason you are pulling the rod? the rod and crank normally have roller bearings unlike most automotive engines... and typically dont go bad?

normally you just pull the wrist pin from the piston and do a new piston/cylinder?

79coyotefrg · « **Reply #11 on:** Nov 10, 2010, 03:29:17 PM »

gave you a point bog

BoG-ToY · « **Reply #12 on:** Nov 10, 2010, 03:50:32 PM »

thanks glen

blackSR5 · « **Reply #13 on:** Nov 11, 2010, 09:29:00 AM »

I dont want to pull the rode...just need them to press out the piston...thats it.

jimbo74 · « **Reply #14 on:** Nov 11, 2010, 10:11:29 AM »

i seriously doubt you are going to be able to bend a connecting rod from hitting it with a hammer.... unless you are lou ferigno......

i would take it apart, and fix it properly..... trying to cut corners is what made me lose my last truck.... i hate to give away a 84 pickup because i couldn't deal with it, after i blew the engine from a rebuild that had corners cut

79coyotefrg · « **Reply #15 on:** Nov 11, 2010, 10:28:45 AM »

Quote from: jimbo74 on Nov 11, 2010, 10:11:29 AM

i seriously doubt you are going to be able to bend a connecting rod from hitting it with a hammer.... unless you are lou ferigno......

i would take it apart, and fix it properly..... trying to cut corners is what made me lose my last truck.... i hate to give away a 84 pickup because i couldn't deal with it, after i blew the engine from a rebuild that had corners cut

hitting a rod ONE TIME with claw hammer could damage it if hit in the wrong place

blackSR5 · « **Reply #16 on:** Nov 11, 2010, 12:15:06 PM »

That makes sense....I just want too sure.

Again being that it is on a GOKART I am just not too sure how strong the thing is. But we will see...

BoG-ToY · « **Reply #17 on:** Nov 11, 2010, 01:14:45 PM »

If you press it out with a bolt you should be good.
You want a long bolt that will fit through the piston wrist pin and through a a socket or a piece of pipe. If you are replacing the piston don't even worry about messing the piston up. Tighten it up this will only apply pressure to the wrist pin and the rod end if that's what it's hanging up on

BoG-ToY · « **Reply #18 on:** Nov 11, 2010, 01:18:52 PM »

http://www.hoganshogs.com/images/George's/180010E.jpg

Basically this tool but home made! A long bolt and a socket

BoG-ToY · « **Reply #19 on:** Nov 11, 2010, 01:24:23 PM »

http://www.covecustomcycles.com/img/p/1089-462-home.jpg

kneedownnate · « **Reply #20 on:** Nov 11, 2010, 10:58:25 PM »

Surprised nobody has said it: soak a wash cloth in boiling water and wrap the piston. The wrist pin should come out much easier then. Seriously.

BoG-ToY · « **Reply #21 on:** Nov 12, 2010, 09:25:09 AM »

yeah I was thinking bout telling him to hit it with a torch... lol From what I can gather this piston will be replaced right?

Ive never even HEARD of a boiling water dipped rag, sounds like an awesome idea PLUS ONE TURTLE POINT FOR YOU

yeah we had rod heaters for press fit piston pins when installing them...

blackdiamond · « **Reply #22 on:** Nov 12, 2010, 06:02:16 PM »

Sorry, Bog, I couldn't resist taking a point away. We'll see if the rest can overpower me!

BoG-ToY · « **Reply #23 on:** Nov 12, 2010, 07:28:33 PM »

all good I gave you one too

kneedownnate · « **Reply #24 on:** Nov 12, 2010, 11:15:56 PM »

Trick I learned when rebuilding my first motorbike engine

blackSR5 · « **Reply #25 on:** Nov 13, 2010, 12:03:09 PM »

That sounds like a plan...all worth at try!!

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