Locked up motor
08-21-2012, 08:18 PM
#2
Is it a new engine?
Broken in?
Old and crusty?
Any turn of events before it locked up?
Broken in?
Old and crusty?
Any turn of events before it locked up?
08-21-2012, 08:26 PM
#4
were you trying to start it?
do you have a starter box?
do you have a starter box?
08-21-2012, 09:39 PM
#5
08-21-2012, 09:54 PM
#6
funny
When I first started 1/8th scale buggies back in the day there were no starter boxes, at least none I ever saw. It was a pain. I had to use a big airplane bump starter with an epoxied on rubber wheel with a zip tie around it. 
It was the only way to keep it on. One hand held the radio and the front of the car hung over the hood so the starter could be powered by my car battery, and the glow ignitor on and glowing while bumping the wheel under the car while blipping the throttle. When I see people complaining about starting an engine I laugh pretty hard.
As for the original poster If the engine had been running and it's locked up, and with the engine out it won't turn over by hand at all it's most likely a broken connecting rod and crunched piston.
It was the only way to keep it on. One hand held the radio and the front of the car hung over the hood so the starter could be powered by my car battery, and the glow ignitor on and glowing while bumping the wheel under the car while blipping the throttle. When I see people complaining about starting an engine I laugh pretty hard.As for the original poster If the engine had been running and it's locked up, and with the engine out it won't turn over by hand at all it's most likely a broken connecting rod and crunched piston.
08-21-2012, 11:28 PM
#7
It's a used motor, I have a bump box (it is a friends car) I have no history but it looks brand new. It has a pull start as well but I'm trying to figure out where to begin. I think it's been sitting so long the rings are stuck to the cylinder walls
08-21-2012, 11:33 PM
#8
be careful because after i fixed that issue my con rod blew (guessing the tension from getting stuck and unstuck so many times)
Last edited by UnknownWarrior; 08-21-2012 at 11:47 PM.
08-21-2012, 11:39 PM
#9
it shouldnt have "rings" if its a nitro motor, pull the glow plug and put some after run oil in the cylinder and turn it over by hand, with pliers or a box starter with out the glow plug in, i had this issue with my O.S. VZB V-Spec that had a 1/2 gallon thru it. I just pulled the glow plug put a few drops in then tried to turn it over with out the glow plug in
be careful because after i fixed that issued my con rod blew (guessing the tension from getting stuck and unstuck so many times)
be careful because after i fixed that issued my con rod blew (guessing the tension from getting stuck and unstuck so many times)
08-22-2012, 09:22 AM
#12
Hm
Mystery Marvel oil (yes, that's the real name) will unfreeze almost anything. In the exceedingly rare instance where it won't, oil of wintergreen is guaranteed to unfreeze anything. I've used both to free up 30 year old engines, the stuff is fairly inexpensive and works on a bunch of stuff outside of our hobby. (wintergreen is also really good for foam and rubber tires, softens them without eating them up.)
08-22-2012, 04:56 PM
#14
Depending how long its been sitting the bearing could be rusty or gunged up, that will go through the engine if you try to free it up by lubing it, but thats if nothing else is damaged internally.
safest thing to do is strip it down, at least the head and backplate to see why its jammed.
could be just stuck at DTC.
safest thing to do is strip it down, at least the head and backplate to see why its jammed.
could be just stuck at DTC.
08-23-2012, 06:44 AM
#15
If its a new engine of (most) Taiwanese origin, it's probably locked at the top due to the mechanical pinch. You need to ensure you're preheating to 200 degrees Fahrenheit before even thinking about turning it over.