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  1. K

    Can you Loctite Heli-Coil repaired thread?

    Thanks guys for your inputs. I remember seeing a locking insert offered by Heli-Coil. But I am not sure if they can hold the bolts in our engines. I will assemble the engine with Lock-Tite. This is the second time the front housing bolts backed out on me. Each time it happened, the...
  2. K

    Can you Loctite Heli-Coil repaired thread?

    Guys, I was not clear in asking the question. Heli-Coil inserts relies on the coil spring tension to stay in place. I am wondering if I can use red Loctite after repairing the thread. Will red Loctite on the bolt back the insert out? Metric screws have finer thread than UNC or UNF. Metric...
  3. K

    Can you Loctite Heli-Coil repaired thread?

    The front housing bolts in my Picco pre-EXR 45 backed out. Not only did the flywheel get chewed up, the thread became loose. I will need to repair the thread with Heli-Coil. Question: Can you Loctite the Heli-Coil repaired thread? I use red Loctite and I am not sure if the thread will come...
  4. K

    Who made the first production O/B Tunnel?

    I do not think it is a Prather. The nose and the cowl are different. Also the sponsons looked too deep to be a Prather.
  5. K

    K&B crankcase not square

    Brad, The opposing faces of the crank bore measured top and bottom is off by 0.003". This is small and I would let it go. I do not know if the crank bore and the front housing faces are done in the same setup. If so, that would indicate the sleeve and the crank bore are not perpendicular. A...
  6. K

    K&B crankcase not square

    Hi Brad, I am not a machinist and my comments about the manufacturing processes K&B used for the case are probably incorrect. Come to think of it, it would make more sense to mill the mounting lugs first as the reference point. However, I can tell the sleeve bore was done on a CNC while the...
  7. K

    K&B crankcase not square

    Thanks all for your reply. This is a job beyond my machining skills can handle. It may be easier to buy a case. However, there is no guarantee that the new case won't have the same issue. Judging by the machine marks, i guess bored the sleeve first on a CNC. The remaining machine work was...
  8. K

    PAINTING STRIPES ON SPONSON

    I would use striping tape as Mike has suggested. The best (thinnest) stripping tape I've ever used is the Carl Goldberg ones. Not sure if they are still available If you must paint the stripes, I have read a technique many years ago in one of the hobby magazines. For the AVL, paint the...
  9. K

    K&B crankcase not square

    Steve, the PTO end of the crankcase is not parallel to the front housing. It is off by 0.007". However, I suspect it is not the only issue. With the sleeve out of the case, I turned the crank and checked the rod clearance between the PTO and the crank. There appeared to be enough clearance...
  10. K

    K&B crankcase not square

    I hope these photos help explain the issue Thanks, k
  11. K

    K&B crankcase not square

    I can probably find another one on Ebay but there is no guarantee that the case is square. Although 0.007 across the seating surface of the front housing seems small, it is having an effect. The engine does not run as strong as my other .21
  12. K

    K&B crankcase not square

    I decided to run a new K&B 21 outboard that I have in my collection for a couple of decades. The big end of the conrod showed some abnormal wear on both faces. I eventually traced the issue to the crankcase not square. Using my caliper, I measured the thickness between the front housing and...
  13. K

    Polyester resin remains tacky

    I use epoxy to lay up tanks trays. radio box and cowlings. I make my own 'gel coat' by mixing colloidal silica with epoxy resin and brush this paste on the mold. After it has partially cured, I start the lay up process. Parts made this way have no pinholes. I like epoxy and I think it is...
  14. K

    Polyester resin remains tacky

    Thanks Guys for all your replies. Lots of good information here. I would like to share my own experience. On MEKP...I always wear safety goggles when I mix resin. Furthermore, I put the tube of MEKP in a sandwich bag and open the cap in the bag. It is especially important when I pierce open...
  15. K

    Polyester resin remains tacky

    I have never tried sealing the inside of a polyester glass hull with epoxy although I know the epoxy will cure properly. My concern is that if I ever need to repair the hull, like glassing in a new stuffing tube, I will have to sand the repair area free of epoxy or the resin will not cure as...
  16. K

    Polyester resin remains tacky

    Update: I can share what did not work. I first tried putting the hull under a 60W light bulb (incandescent) for 12 hours. The wax started to float to the surface in some area but it is still soft. I then tried brushing on some MEKP and then put cellophane on top. Put the boat in the attic...
  17. K

    Polyester resin remains tacky

    Thanks Guys for your replies. Mark, I bought the resin last summer so it is relatively fresh by my standard. The left over resin in the mixing container cured OK. So it is probably not the resin. I am reluctant to brush on another layer of resin because it will add weight. If I was glassing...
  18. K

    Polyester resin remains tacky

    Good point on heat generation. That makes sense. A thin layer of resin may not generate enough heat. I moved it to the attic and will leave it there for a day. The problem is that the MEKP in the resin may break down after a day or so. I will find out and report on the results
  19. K

    Polyester resin remains tacky

    I know the difference between laminating resin and finishing resin. I have experience with polyester resins and have been molding my own parts. However, my experience is that finishing resin with wax added will cure tacky if spread to a thin layer. This is especially true if you apply it as...
  20. K

    Stainless tanks

    From experience, a metal tank with soldered seams leaks because the solder gets corroded. I am sure the vibration does not help either. I have used silver solder and also tin/lead solder with acid core. They both get corroded over time when exposed to fuel.
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