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Life after meltdown

10 Jan 2021 09:10
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Life after meltdown #1
I decided to chronicle the rebirth of my ,74 DT 360 that unfortunately melted down on Christmas Eve and to build it back in the most reliable manner with the help of this sites endurologists.

Engine completely disassembled and notwithstanding cylinder that will clean up with 1O/S looks pretty darn good inside.

I am going to replace crank bearings which are in the freezer.

Question 1. What’s the best temperature to heat case halves in oven, knowing that bearings are in freezer at -3F?

Question 2. What is optimal cylinder/piston clearance? Can I assume that piston measurement taken near bottom of skirt perpendicular to wrist pin?

Thanks

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10 Jan 2021 09:18
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Life after meltdown #2
Glad you're making lemonade out of lemons. I bring the cases up to about 250F. The correct piston/cylinder clearance is in the service manual...but I don't have a DT360A yet. Maybe manual on this site? I know that the Yamaha clearance is a little tighter than rule-of-thumb clearance that general machine shop engine builders use.

1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B

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10 Jan 2021 10:18
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Life after meltdown #3
Mains and clutch release installed, wife never noticed I used oven!

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10 Jan 2021 16:41
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Life after meltdown #4

msavitt wrote: Mains and clutch release installed, wife never noticed I used oven!


Yes she did. She just didn't say anything about it.

It's better to remain silent and be considered a fool than to speak and remove all doubt.
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10 Jan 2021 17:01
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Life after meltdown #5

Midlife Motor wrote:

msavitt wrote: Mains and clutch release installed, wife never noticed I used oven!


Yes she did. She just didn't say anything about it.


Ha. That's what I was thinking too. She was probably doing something devious herself so she let it slide.
:whistle:

Schu

70 Yamaha CT175
71 Yamaha CT175
71 Yamaha JT60
72 Yamaha JT60 (2)
74 Yamaha DT360
75 Yamaha GT80
75 Yamaha DT100
75 Yamaha DT125
75 Yamaha DT175
76 Yamaha DT175
75 Yamaha DT250 (2)
75 Yamaha DT400
76 Honda Z50
17 Yamaha SCR950

"Someday, you'll own some Yamahas"

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10 Jan 2021 18:10
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Life after meltdown #6
That’s funny and so true. I am very psyched by my rebuild. Now I am designing pullers to pull the crank into cases, great relaxation!!!

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10 Jan 2021 21:11
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Life after meltdown #7
You can get a crank installer for under 100 bucks. I have one from RMATV I got years ago and have used countless times. Not as much fun as doing it yourself but it sure is nice when the motor goes together smooth as butter.

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10 Jan 2021 21:13
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Life after meltdown #8
DEET makes a set that comes with all the adapters for all the Enduros... hard to find that anyplace.

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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10 Jan 2021 22:02
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Life after meltdown #9
If you haven't put the cases together, I discovered a trick installing the kick start spring. The spring is inside the case and may fall out of place when putting the cases together, so in the pic I installed a zip tie to hold in place.



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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11 Jan 2021 09:59
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Life after meltdown #10
mdscott, MarkT, turbodan - thanks for your advice, it very much appreciated and has been taken!
taking my sweet time on putting things together, this time she will be perfect!

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