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Old 06-18-2009, 01:50 PM   #1
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Default rebuilding an engine

ok guys, i know to rebuild an engine im just having trouble.

i have an os vspec that im doin rod and bearings

im tryin to take the c clip out of the piston to take the rod out but it wont come out. both sides dont curl in the center, ive used exacto blade, a pic, and a needle. any ideas?


EDIT:

ok i FINALLY got it out but now i have an issue, i was getting the bearings out and the back of the exhaust hole broke on the case, will i have to get a new case? heres pics it not bad
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rebuilding an engine-0618091430.jpg   rebuilding an engine-0618091429.jpg  
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Last edited by losi_racer; 06-18-2009 at 02:32 PM.
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Old 06-18-2009, 02:32 PM   #2
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new problem
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Old 06-18-2009, 02:35 PM   #3
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How da heck did you do that?!
Yes new case is needed.
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Old 06-18-2009, 02:37 PM   #4
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the rear bearing wasnt coming out, it actually burnt the rear bearing.

after 20 min of being in the oven i tried forcing the bearin out, it was stuck have way out but it wasnt going. so i put it back in not wanting to mess the case up and i pulled it out about 5 min later and smacked it on my hand, bearing came out, but a piece of the case was in my hand as well
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Old 06-18-2009, 02:40 PM   #5
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Wow. That's wild.
20 minuets sounds like a long time in the oven. I left mine in 10min and the rear being came loose. I did it on a nova though.
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Old 06-18-2009, 02:41 PM   #6
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Originally Posted by Alan D. View Post
Wow. That's wild.
20 minuets sounds like a long time in the oven. I left mine in 10min and the rear being came loose. I did it on a nova though.
i know, i dont know why it didnt come out. ive rebuilt about 4 motors so far and this is the first one it didnt come out after 10 min



should i get the speed case or reg?
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Old 06-18-2009, 02:43 PM   #7
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i will go out on a limb say that a new motor is in your future
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Old 06-18-2009, 02:44 PM   #8
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i will go out on a limb say that a new motor is in your future
this motor has given me so many issues its unreal. but i have everything new for this now except a case and a cooling head
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Old 06-18-2009, 02:54 PM   #9
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Originally Posted by losi_racer View Post
this motor has given me so many issues its unreal. but i have everything new for this now except a case and a cooling head
I have a spare case Doug $50, you can pick it tomorrow with the Tire balancer
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Old 06-18-2009, 02:55 PM   #10
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First I'm not flaming OS engines. However there cases have been suspect for a long time. That rear bearing should have fell out after 10 mins at 350 degrees. I just did 2 piccos and a Jammin and no problems with rear it always just fell out. However with the fronts you might have to use a little force not much.

Actually I'm for one glad to see you rebuilding it. Theses engines can be rebuilt time and time again as long as the case is in good shape. A dollar saved is a dollar saved no matter how you slice it.

P.S. Don't put your bearings in the freezer before you install them. It's not necessary and a real dumb idea. What happens when metal goes from below freezing to above 200 in seconds.
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Old 06-18-2009, 02:55 PM   #11
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Quote:
Originally Posted by losi_racer View Post
should i get the speed case or reg?
The speed case is the same junk... i would get a JX case
http://cgi.ebay.com/Mugen-Ninja-JX21...3%3A1|294%3A50
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Old 06-18-2009, 05:44 PM   #12
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Originally Posted by vladconnery View Post
P.S. Don't put your bearings in the freezer before you install them. It's not necessary and a real dumb idea. What happens when metal goes from below freezing to above 200 in seconds.
......just did just that in my mega on-road motor......the wrong way is to force them in with a press/puller......you are wearing out the case....freeze them for 24 hours in a zip loc bag....heat case to 300 or so on a hot plate....put bearings on crank and they should drop right in with no force at all....it's called interference fit......
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Old 06-18-2009, 05:58 PM   #13
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Dont waste your tme rebuilding these tiny engines.
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Old 06-18-2009, 05:59 PM   #14
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Quote:
Originally Posted by vladconnery View Post
First I'm not flaming OS engines. However there cases have been suspect for a long time. That rear bearing should have fell out after 10 mins at 350 degrees. I just did 2 piccos and a Jammin and no problems with rear it always just fell out. However with the fronts you might have to use a little force not much.

Actually I'm for one glad to see you rebuilding it. Theses engines can be rebuilt time and time again as long as the case is in good shape. A dollar saved is a dollar saved no matter how you slice it.

P.S. Don't put your bearings in the freezer before you install them. It's not necessary and a real dumb idea. What happens when metal goes from below freezing to above 200 in seconds.
Quote:
Originally Posted by Taylorm View Post
......just did just that in my mega on-road motor......the wrong way is to force them in with a press/puller......you are wearing out the case....freeze them for 24 hours in a zip loc bag....heat case to 300 or so on a hot plate....put bearings on crank and they should drop right in with no force at all....it's called interference fit......


You both make very valid points. Now I am curious as to which way is better
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Old 06-18-2009, 07:03 PM   #15
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Originally Posted by easyryder View Post
Dont waste your tme rebuilding these tiny engines.
So if I worked with these engines, then would rebuilding a regular car sized motor be wasting my time? Should I just buy a whole new motor everytime?

http://people.bath.ac.uk/ccsshb/12cyl/
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