SOHC.co.uk Forums > CB350/400
400 four knocking noise.
Clem2112:
First reply failed.... probably because I tried attaching too many photos.
Anyway the clutch basket rivets are all out now.
They needed some extra persuasion though...
Drilling the flat heads off freed the retainer plate.
Since the other end (or upset) would be gripping the hole, I drilled into that as centrally as I could (punch mark first) with a 3mm drill about 6mm deep. Then 4mm drill to the depth of the deformed end to weaken it a bit more.
The old dampers were a lot better than I imagined. Still flexible but had shrunk slightly. Also some small cracks around the centre slot corners.
The Honda ones have an asymmetric shape with cutouts too - the new ones are symmetrical and full form but should do the job and without the backlash. Pictures will follow.
Next comes the threading ... WD40 is recommended it seems.
The holes are already about 4.2/4.3 diameter (a new 4.2 drill is a slack fit). 4.2 is the spec for M5x0,8.
The depth of thread will be about 14/15mm ... satisfies the 3x bolt dia rule (ish).
Also have to drill out the plate holes to clear the bolts.
to be continued...
Clem2112:
Yes, the rivet holes are being tapped.
I thought inserts might be needed too..... certainly if I mess up tapping the first hole !
A small tack weld on each bolt edge to the plate might be a belt and braces way... ??
Kevin (ttr400) says to use red Loctite to lock them for good- he has done a few.
Since the bolts (hopefully) never need to come out again this should suffice.
I'll see how the fit of the bolts "feels" ... I know a local place that just helicoiled my cylnder head (again)
Lobo:
Is there enough 'material' in each of the 6 'lugs' (?) to drill a size up and helicoil? Must all be getting a bit 'thin' I'd have though.
Very interested in this one Clem (Simon) as my cushs in the post & this task pencilled in for me soon. Keep the good info coming.
Lobo (Simon #2)
Clem2112:
--- Quote from: Lobo on October 03, 2013, 01:24:06 PM ---Is there enough 'material' in each of the 6 'lugs' (?) to drill a size up and helicoil? Must all be getting a bit 'thin' I'd have though.
True, there is only 2 or 3 mm to the lug sides... hence only an M5 not M6 bolt.
--- End quote ---
ttr400:
Helicoils are not required. just tap to M5.
Kevin
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