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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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Posted: 20:15 - 26 Apr 2021 Post subject: Splitting crank cases |
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Hi all.
I've got a 1976 Dt 175 which needs new main bearings and might do the transmission bearings while I'm at it, unfortunately I can't get the cases to split it seems the Yamaha used some sort of hard glue and not a gasket to join the cases together, I thought about putting it in the oven, but like Jasper carrot, me mam won't let me fix it in the kitchen, I gotta fix it in the garding.
I'm gonna try using a heat gun but wonderd if any of you guys have got any tricks up you're sleeve Hmm maybe thinners might soften it.
Any ideas would be welcome.
Cheers girty. |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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jeffyjeff |
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jeffyjeff World Chat Champion
Joined: 02 May 2020 Karma :
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davebike |
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davebike World Chat Champion
Joined: 15 Nov 2013 Karma :
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Posted: 08:40 - 27 Apr 2021 Post subject: |
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As a mechanic
Are you sure I mean really sure you have all the bolts out ! ____________________ Dave
NC750Xdct + others at work !
davebike1@gmail.com |
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 12:01 - 27 Apr 2021 Post subject: |
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Don't know if it's any help but here's my favourite Indian bodge-merchants breaking down the slightly later DT125 engine:
https://youtu.be/RqGF-BZKMFc
But as Dave suggests, might be a fixing you're a missin'
<edit> or try this one:
https://youtu.be/ZPcR9RlsgRI ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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Posted: 16:27 - 27 Apr 2021 Post subject: |
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Guess who's a plonker.
I was so busy looking for bolts I completely overlooked the bush in the rear engine mount.
So as you can guess after forty years it ain't gonna budge, so it's I've taken it to a local engineering shop.
The fella working there is so old he still uses a trumpet as a hearing aid, he was asleep in his chair when I got there I thought he he was gonna have a heart attack when I woke him up the only piece of metric equipment he had in his workshop was a ruler. |
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jeffyjeff |
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jeffyjeff World Chat Champion
Joined: 02 May 2020 Karma :
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Posted: 19:59 - 27 Apr 2021 Post subject: |
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A little heat and a hydraulic press. He'll have that bush out of there lickety split. ____________________ History shows again and again how nature points out the folly of men - BOC |
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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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Polarbear |
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Polarbear Super Spammer
Joined: 24 Feb 2007 Karma :
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 23:08 - 27 Apr 2021 Post subject: |
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Using a hydraulic splitter is a phenominally poor idea. You'll probably bend or break those casings then you won't have to worry any more.
How certain are you that every casing bolt is removed? How clean is the lump and have you jet-washed out every pit and crevice on the outside? Is the generator and stator blackplate removed from the casings? There are often bolts of screws hidden behind the backplate.
If every screw and bolt are out then getting it hot ( but stay below 300 degrees C) will break any glue bond and expand the casing enough to loosen the ally housing off the steel bearings.
Bottom line, use as little force as possible. Heat is your friend. Don't bash the end of the crank even if you have the nut on it. The crank is fairly soft and you'll wreck the spigot perhaps even bend the taper. Use a rubber mallet if you have to. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 23:58 - 27 Apr 2021 Post subject: |
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If there's no gasket, wouldn't they have used Yamabond?
That's not too difficult to split and +1 for what Pete and Polarbear said, if you use a portapower to split your cases, they will be fooked at the end of it, along with any bearing or shaft that runs between them.
There's something else going on here......... ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Posted: 12:35 - 28 Apr 2021 Post subject: |
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On the video posted by Easy-X..
https://www.youtube.com/watch?v=ZPcR9RlsgRI
At 22m45s our host 'DIYPhil' fashioned a puller from some angle iron and bolts to split the cases. Approved technique? No idea. Seems to work though. ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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Posted: 21:46 - 28 Apr 2021 Post subject: |
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Hi easy thanks for coming round today it was worth a try with two pairs of hands, I took the engine round to Phil the grease monkey in central avenue, he's gonna stick it in his oven apparently he's got some kind of air splitter that should do the job, hopefully I'll pick it up tomorrow gonna do the gearbox bearing while I'm at it, cheeky buggers want £80 for a kit of 4 bearings
Been checking online I can get them for about £30 if I buy them individually.
Probably stick a clutch and springs it aswell provided it comes apart that is.
Fingers crossed.
Thanks to the rest of you guys for all you're advice it's much appreciated.
Cheers girty. |
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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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Posted: 21:20 - 29 Apr 2021 Post subject: |
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Oh what day, well the crank cases are apart whopeee, but the mechanic wasn't overjoyed apparently it took one hydrolic press two hand presses and three mechanics an hour to get it apart, he reckons somebody had used liquid metal to glue the cases together.
He also recommended getting the crank rebuilt.
But we all know sods law says for every good thing you must pay with three bad things.
1 £60 labour plus i guess a couple hundred for crank rebuild.
2 get home wet patch on ceiling, baths been leaking call plumber more expense.
3 I go down shed to make a start on the engine, plumber turns up knocks on door no answer knock again hears screaming go round back, he comes round the back we go indoors thiers my 85 year old mum laying on the floor having a rest, broken hip & half a golf ball sticking out of her head, fell of the bottom step of the stairs rushing to answer the door, why do old people always rush, why did I go down the shed.
I suppose you could say it's been a poxriden day.
Not even allowed to go to the hospital, spent hour and a half repeatedly calling a&e tonite before I got through, she still waiting blood test results.
And my bathtub still leeks |
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 21:56 - 29 Apr 2021 Post subject: |
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'kin hell ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Dirtygirty |
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Dirtygirty Two Stroke Sniffer
Joined: 08 Apr 2021 Karma :
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Posted: 13:53 - 30 Apr 2021 Post subject: |
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Dirtygirty wrote: | Oh what day, well the crank cases are apart whopeee, but the mechanic wasn't overjoyed apparently it took one hydrolic press two hand presses and three mechanics an hour to get it apart, he reckons somebody had used liquid metal to glue the cases together.
He also recommended getting the crank rebuilt.
But we all know sods law says for every good thing you must pay with three bad things.
1 £60 labour plus i guess a couple hundred for crank rebuild.
2 get home wet patch on ceiling, baths been leaking call plumber more expense.
3 I go down shed to make a start on the engine, plumber turns up knocks on door no answer knock again hears screaming go round back, he comes round the back we go indoors thiers my 85 year old mum laying on the floor having a rest, broken hip & half a golf ball sticking out of her head, fell of the bottom step of the stairs rushing to answer the door, why do old people always rush, why did I go down the shed.
I suppose you could say it's been a poxriden day.
Not even allowed to go to the hospital, spent hour and a half repeatedly calling a&e tonite before I got through, she still waiting blood test results.
And my bathtub still leeks |
Oh bugger. ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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1198 |
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1198 World Chat Champion
Joined: 24 Jan 2013 Karma :
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Old Thread Alert!
The last post was made 2 years, 333 days ago. Instead of replying here, would creating a new thread be more useful? |
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