thats a good idea
can get a large breaker bar + socket on the end of the crank and get some movement out of it?
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| Unseizing a Seized engine https://www.ausmini.com/forums/viewtopic.php?f=2&t=17555 |
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| Author: | CJ_DT [ Sun Mar 26, 2006 10:41 am ] |
| Post subject: | Unseizing a Seized engine |
Hello, I have a aquired a motor (non mini but that doesnt matter) that is seized, at some stage in the last 25-30 years where it was sitting in a shed, somehow water has gotten into the cylinder, I pulled the head, and the bore had some surface rust, but came up fine after a sand with wet rub, however the piston is seized in the bore. I assume that its due to the rings rusting to it, but is there any sure fire way of unseizing the little sucker, or is it a bin job? Its currently got a mix of diesel, canola oil and WD40 sitting in the bore above the piston, but because its a 2 stroke, it seems to be able to leak out of the damn holes aorund it faily quickly. Chris |
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| Author: | dodge [ Sun Mar 26, 2006 10:55 am ] |
| Post subject: | |
ur doint the right thing, after a day or two with WD40 , split the casing and pull out the crank, rod assembly |
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| Author: | dodge [ Sun Mar 26, 2006 10:56 am ] |
| Post subject: | |
being a 2 stroke i would say its a big end .. |
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| Author: | Joe [ Sun Mar 26, 2006 11:30 am ] |
| Post subject: | |
might be a good idea before you pull the crank out to try every couple of days after topping it up with crc/oil/whatever to rotate the crank, forwards, backwards etc... to unsieze my midget motor I put crc and oil in the bores and rocked the car while it was in gear... |
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| Author: | CJ_DT [ Sun Mar 26, 2006 12:13 pm ] |
| Post subject: | |
I will keep doing what I am doing then, and resist the urge to start belting the living hell out of stuff with a sledge hammer, sadly patience is not one of my strong points. Thanks Guys |
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| Author: | Joe [ Sun Mar 26, 2006 12:32 pm ] |
| Post subject: | |
thats a good idea
can get a large breaker bar + socket on the end of the crank and get some movement out of it? |
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| Author: | drmini in aust [ Sun Mar 26, 2006 1:11 pm ] |
| Post subject: | |
I've got the same prob with a Honda CB750 that was parked in a shed for 9 years. I've had WD40, then oil in the bores 6 months now, bugger still won't budge. I put a torque wrench on the crank bolt at alternator, gave it 50lb/ft to rock it and still no turn over. Crank does rock a poofteenth.. 
Ah well looks like motor out, head off, block of wood and a BFH needed... 
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| Author: | dodge [ Sun Mar 26, 2006 1:43 pm ] |
| Post subject: | |
try to diesle flush it too. |
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| Author: | Joe [ Sun Mar 26, 2006 5:39 pm ] |
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dodge that picture is hypnotic |
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| Author: | TurboOrangie [ Sun Mar 26, 2006 6:37 pm ] |
| Post subject: | |
After reading that molasses trick in a post earlier today I think I'd give that a try. |
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| Author: | Morris 1100 [ Sun Mar 26, 2006 6:48 pm ] |
| Post subject: | |
Molasses is very thick. Maybe vinegar would work better? I have used vinegar on slave cylinders that the pistons were seized so tight that you could not move the piston with a hammer. After a few days in vinegar the pistons came out. Heat is also another thing to try. If you have access to a hot water hose (I have a Kerrick hot water pressure washer) you can heat up the cylinder and it will expand a little so that you may be able to move the piston. If it is a single cylinder engine you may be able to heat it up in the laundry tub. 
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| Author: | drmini in aust [ Sun Mar 26, 2006 6:52 pm ] |
| Post subject: | |
I wouldn't try molasses in most motors to unseize them, they have aluminium pistons, and molasses eats it. use molasses only on iron and steel parts.... |
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| Author: | Hagar [ Mon Mar 27, 2006 7:18 am ] |
| Post subject: | |
Park it at the top of your sloping driveway pointing at the house , leave it in gear, handbrake off. Motor will defininitely un-sieze. Guantareed. 
(yes, I know you said it's a mot a mini - but a two stroke engine) |
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| Author: | cush [ Mon Mar 27, 2006 8:16 am ] |
| Post subject: | Re: Unseizing a Seized engine |
CJ_DT wrote: Hello,
I have a aquired a motor (non mini but that doesnt matter) just it does bloody matter..... it means that this post shouldn't have been in Mini Chat 
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| Author: | sports850 [ Mon Mar 27, 2006 2:49 pm ] |
| Post subject: | |
Digressing slightly , I had a series 1 landrover with a similar problem , leaving it sit with wd40 etc in the bores didn't do any good till a mate came up with the bright idea of taking the sump off , turning it upside down and putting the wd40 mix in from the underside as well . It'd had a week sitting right side up with it supposedly seeping down from the top followed by a few days upside down with it seeping the opposite way . It must have met in the middle because it turned over easy after that . All we could come up with for a theory was the rings had rusted in so well that the mix could penetrate the top set but not any further , putting it in from upside down meant it got through all of the rings . Good luck . |
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