SOHC.co.uk Forums > CB350/400
Hairline crack in engine lower casing at front left engine mount
awrawr:
Where has the nut gone?
Erwin83:
--- Quote from: mike the bike on February 24, 2020, 03:01:39 PM ---Just remember to put the shorter bolt in that side and don't forget the spring washer or you'll be doing the job again.
--- End quote ---
Yep, the longer bolts have found their way to the bin.
--- Quote from: awrawr on February 24, 2020, 09:52:14 PM ---Where has the nut gone?
--- End quote ---
The nut is completely encapsulated by the Quiksteel. The crack is also inside the little nut-area (that's where the long bolt pushes), so in order to have material cover the crack I had to:
- Apply the Quikmetal in that tight area, covering all of the crack (mind, my finger doesnt fit there, so I used a small spatula, not ideal).
- Push the nut firmly in Quikmetal to avoid risk of the nut not fitting anymore altogether
- Screw the engine bolt in to make sure the nut was lined up correctly
(all this in 2 minutes)
I didn't like the result of this (hard to be sure I had decent coverage), so decided to cover the whole area with the nut inside.
Like I said, not the prettiest of solutions, but... so far she's dry.
Tomb:
Won't oil eventually make its way up the bolt thread and leak out that end?
Erwin83:
--- Quote from: Tomb on February 25, 2020, 11:27:10 AM ---Won't oil eventually make its way up the bolt thread and leak out that end?
--- End quote ---
No, I don't think so.
There is space between the nut and the cracked surface, which I filled with Quikmetal.
However this space is tight, like 2-3 millimeters, so there was no physical way to patch it and keep the nut 'serviceable'.
Drawings are a top view (when laying on your back, looking up under the engine).
The Quikmetal patch now forms a layer between the cracked surface and the nut.
Tomb:
Gotcha. Yep looks good.
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