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Play in crankshaft

14 Nov 2020 01:09 14 Nov 2020 04:18 by eight0.
eight0
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Play in crankshaft #1
Hi all,

Been a while since posting on here. After doing a mild restoration on my 77dt250, rebuilding the top end and getting it running I was a bit disheartened to hear it clattering away like it was an old piston.

Other projects got away in the meantime and now I want to get back on it.

I've noticed that there is some lateral movement on the crankshaft. I've taken a video where you can see me moving the flywheel, I can confirm though that even with the flywheel removed the same happens on the shaft.

Pretty sure that's not normal play..?

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14 Nov 2020 03:36 15 Nov 2020 10:59 by Bigdog302.
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Play in crankshaft #2
you need new main bearings pretty much. you will need to tear it down some and spit the cases. Deet sells tools to make this a much easier job to do.

2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!

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14 Nov 2020 04:00
eight0
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Play in crankshaft #3
Thanks for the reply Bigdog. I feared that might be the case.
Guess I will have to bite the bullet and split the cases. I'll do some reading through the forum and see what special tools I might need.
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14 Nov 2020 05:16
Bigdog302
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Play in crankshaft #4
If you need some help, myself and the others on this forum can be a big help. if you have questions, don't be afraid to ask. you might want to get new crankshaft seals to go with the new bearings as bad bearings take out the seals.

2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!

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14 Nov 2020 15:26
mdscott
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Play in crankshaft #5
Case splitter is all I've used to dissemble. Heat the case and freeze the bearings to install into the case. Putting back together I freeze the crank and carefully heat the bearing. There are tools to pull the crank into the bearings.

Thanks Mark
Roseville, Ca.

'06 GL1800
'98 KDX220
'75 Norton
'73 CB500K
'01 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR80R

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14 Nov 2020 15:38
MarkT
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Play in crankshaft #6
"Case splitter" is just basically a steering wheel puller. You can often get one (free rental) from Autozone or similar store... might need to buy longer bolts but the old Snap On puller set I have comes with bolts that work just fine.

Or you can buy one on Amazon.

Assembly tool... if you don't use the freeze/heat method... can also be made pretty easy or go first class and buy one from DEET.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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15 Nov 2020 02:20 15 Nov 2020 02:43 by eight0.
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Play in crankshaft #7
Thanks for the advice.

I'm in the UK so not as blessed as you guys with the parts stores.
Given the current climate ordering anything from outside Europe may take far too long to arrive.
I can get a case splitter for around £50. The puller is about the same price on top of that... I may try the freeze heat method, how easy is it to make a puller? I guess I'll worry about that when I get that far.

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15 Nov 2020 03:38
MarkT
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Play in crankshaft #8
I would expect that Halfords or Amazon in the UK would have something like this available? Might be more economical than a bespoke "case splitter"? You need something that will span the two threaded holes in the left case half along with long enough bolts to attach so you can use the center puller screw to press the crank from the case.

amazon.com/Shankly-Flywheel-Complete-Cra...eering/dp/B01MS1KM0L

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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15 Nov 2020 07:21
eight0
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Play in crankshaft #9
Ok ordered some parts and tools and pulled the engine today.
Got this far. Is there anything I can get away without disassembling or does it all need to come apart before I split the cases.

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15 Nov 2020 08:01
Pedalcrazy
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Play in crankshaft #10
It pretty much all has to come apart. I run zip ties or small wire through the nuts, washers, gears, shims in the order they come off and take pictures as you go. I've had great success by doing that. You'll want to carefully look over all the internal parts for wear and breakage. The exploded views in shop manuals are also very helpful for re-assembly if you get to a point where you're not sure of something. Good luck!

1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
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