07-09-2021, 04:10 AM
The bottom line question is ( I know, you not gonna like it):
why did you let paint shop guys handle fuel pump installation/tightening M6 nuts, that only requires small torque of 9 lb/ft
Now, do not know your machinist skills, but a broken tank flange stud can be drill out, careful, just the ring, not through the tank, and there is limited depth space
* grind off sticking out stud to the ring level
* sharp centre punch mark right in the middle of the broken stud - the more perfect you are, the better result you'll get
* for M6 stud, use cobalt or HSS M2 drill bit, to drill out a pilot hole approx. 5-10 mm deep/not through the tank, then M5 final drill bit. Do not use cheep drill bits as it will wreck your job!!
Use masking tape to limit drill bit length/penetration while drilling
* tap M6 thread. A set of 2 taps would be perfect, starter and finishing
* a custom length M6 flange bolt (not a bolt with flat or spring washer) to suit your needs.
When drilling, use WD40 as cutting oil, small/handy drill with slow to moderate speed with 90* angle to the tank's plate.
A few examples:
![[Image: 6195f16ebb48ce00a719b5d9f910df4b.png]](https://cb1100forum.net/forum/uploads/imp/202107/6195f16ebb48ce00a719b5d9f910df4b.png)
![[Image: 97583c6a4d3c216639075f73d545c451.jpg]](https://cb1100forum.net/forum/uploads/imp/202107/97583c6a4d3c216639075f73d545c451.jpg)
![[Image: 5957287c0adaa15dee7178c26dd881ea.jpg]](https://cb1100forum.net/forum/uploads/imp/202107/5957287c0adaa15dee7178c26dd881ea.jpg)
![[Image: 8325e78da7bdf078dde926e59ab27032.jpg]](https://cb1100forum.net/forum/uploads/imp/202107/8325e78da7bdf078dde926e59ab27032.jpg)
Other method for less skilful operators is to drill it right through, use M6 flange stud and seal it with JB weld or Loctite for gas tank application.
https://www.loctiteproducts.com/en/produ...pound.html
https://www.jbweld.com/product/waterweld-epoxy-putty
Also check youtube for your convenience, plenty there.
Professional machine or radiator shops might be handy as well.
By reading your posts, I know you have mechanical skills, so good luck in successful repair by either way
Feedback and pics mandatory when completed.
why did you let paint shop guys handle fuel pump installation/tightening M6 nuts, that only requires small torque of 9 lb/ft
Now, do not know your machinist skills, but a broken tank flange stud can be drill out, careful, just the ring, not through the tank, and there is limited depth space
* grind off sticking out stud to the ring level
* sharp centre punch mark right in the middle of the broken stud - the more perfect you are, the better result you'll get
* for M6 stud, use cobalt or HSS M2 drill bit, to drill out a pilot hole approx. 5-10 mm deep/not through the tank, then M5 final drill bit. Do not use cheep drill bits as it will wreck your job!!
Use masking tape to limit drill bit length/penetration while drilling
* tap M6 thread. A set of 2 taps would be perfect, starter and finishing
* a custom length M6 flange bolt (not a bolt with flat or spring washer) to suit your needs.
When drilling, use WD40 as cutting oil, small/handy drill with slow to moderate speed with 90* angle to the tank's plate.
A few examples:
Other method for less skilful operators is to drill it right through, use M6 flange stud and seal it with JB weld or Loctite for gas tank application.
https://www.loctiteproducts.com/en/produ...pound.html
https://www.jbweld.com/product/waterweld-epoxy-putty
Also check youtube for your convenience, plenty there.
Professional machine or radiator shops might be handy as well.
By reading your posts, I know you have mechanical skills, so good luck in successful repair by either way
Feedback and pics mandatory when completed.