- Thread starter bawjaws
- Start date
madkayaker
Pro sparkey Pro Welder
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even better if its there body part
Nathan
Tea anyone?
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That looks quite nasty. It is quite hard to seperate crankcases especially if the have never come apart before. Normally i use a rubber mallet and give the case a gentle knock at the seam all the way round to pop them. then gently tap a raised part of the case to split them. dont leaver in the joint as you will knacker the seal. ]
good luck
good luck
michael1703
Member
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- Suffolk
I wouldnt jet wash the cases
go to a cheap toys n goods shop
buy a heavy duty stack n store toy box
put a litre or two of petrol in and give the case a good clean with a paintbrush
pour the dirty petrol (strain) into a waste oil container and mark as cleaning petrol and clean the container with clean fuel on a bit of kitchen roll
pour the rest of the clean fuel into the container and wash the crankcase again
Needs to be a good thick plastic box so it doesnt get attacked by the petrol
you can also use a petrol/diesel mix as its oilyer and leaves a protective residue
go to a cheap toys n goods shop
buy a heavy duty stack n store toy box
put a litre or two of petrol in and give the case a good clean with a paintbrush
pour the dirty petrol (strain) into a waste oil container and mark as cleaning petrol and clean the container with clean fuel on a bit of kitchen roll
pour the rest of the clean fuel into the container and wash the crankcase again
Needs to be a good thick plastic box so it doesnt get attacked by the petrol
you can also use a petrol/diesel mix as its oilyer and leaves a protective residue
chunkolini
celebrity artiste
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I think the best bet would to put it in the canal with all the other two strokes, and the puppies and kittens. Itw ould be happy and fulfilled there.
Chunko'.
Chunko'.
i think thats where its heading for
ive had several attemts at fitting and removing the crank from the casings because it would never line up right or it would crush the bearings to the point that it wouldent turn freely, so for the last time fitting it when i thought i had everything right, i gave the crankcase some taps with the hammer and it shattered and its een more of a ba5tard because id been hitting the crankshaft before to get it in place but i mushroomed that and then decided to whack the case, so everythings a loss
but the bearings did take some amount of force to go in, they must have used a hydraulic press when the bere being manufactured, im off to look for a new engine
ive had several attemts at fitting and removing the crank from the casings because it would never line up right or it would crush the bearings to the point that it wouldent turn freely, so for the last time fitting it when i thought i had everything right, i gave the crankcase some taps with the hammer and it shattered and its een more of a ba5tard because id been hitting the crankshaft before to get it in place but i mushroomed that and then decided to whack the case, so everythings a lossbut the bearings did take some amount of force to go in, they must have used a hydraulic press when the bere being manufactured, im off to look for a new engine
madkayaker
Pro sparkey Pro Welder
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they do that sometimes only need a small amount of stress and they pop
madkayaker
Pro sparkey Pro Welder
- Messages
- 13,678
no hammer this time put it in the new shinny tool chest
chunkolini
celebrity artiste
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- Swansea
Fecked???
If it as bad as it sounds, stroll to the fridge and open a bottle of decent cider, not namby pamby strongpecker, the decent stuff, and drink a toast to it. Then push it in the canal.
Chunko'.
If it as bad as it sounds, stroll to the fridge and open a bottle of decent cider, not namby pamby strongpecker, the decent stuff, and drink a toast to it. Then push it in the canal.
Chunko'.
simon718
needs to stay off ebay
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- 2,013
since when did that stop anyone
and i'd be more concerned about his hatred for all things fluffy
Nathan
Tea anyone?
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- 160
Well ive rebuilt many many 2 stroke engines and ive done everone myself. Use the technique i shown and you should be ok. make sure you have a mallet and nylon hammer around. Just dont get mad with it and start hacking at it lol
Sure you have undone every bolt? sometimes one side opens and the other doesnt if you have
Sure you have undone every bolt? sometimes one side opens and the other doesnt if you have
wyn
Member
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- Cardiff
I've always used home made pullers to pull and push the crank in and out so the balance doesn't get altered and so the main bearings don't get damaged.
But only pull against the inner race of the bearing when putting it back together. You might also find the crank is a tighter fit in one side of the crankcases than the other (i think the electrics side, it may have additional tapped holes on that side for that purpose). so pull the crank into this side first. When all the bits are fitted the other cranckcase should slide over the crank a bit easier.
But only pull against the inner race of the bearing when putting it back together. You might also find the crank is a tighter fit in one side of the crankcases than the other (i think the electrics side, it may have additional tapped holes on that side for that purpose). so pull the crank into this side first. When all the bits are fitted the other cranckcase should slide over the crank a bit easier.
i had it apart/back together several times and it was a really really tight fit for the bearings, my dad has worked on all typs of engines (mostly vespas and lambrettas) and he says its the most stubborn one hes came across, the only way it would come apart was the hit the shaft with a mallet and block of wood, and it was full pelt pretty much, getting it back on after cleaning was the problem the bearings wouldnt seat well and would "crush" and not turn freely, so the process happened several times until i tried cutting a gasket and using instant gasket together (rather than instant gasket on its own) and when i thought it was all perfect i started tapping (or clouting!) the case and it snapped right off, i said pretty much all the nasty words i could think off in under 5 seconds
anyway i got anoter cheap scoter yesterday with the same minerelli engine it it, got it out changed all the electrics, water pump,clutch,variator, belt ect and after hours of work done to it i noticed that there was no valve on the crankcase for pumping fuel through to the carb,(my bike has a tank lower than the carb at the front whereas the spares bike has a gravity fed one under the seat), this now renders the engine useless to me, so im now on the hunt for another one(or a spare caseing)
