$projecthp
Thanks Thanks:  0
Dislikes Dislikes:  0
Results 1 to 7 of 7
  1. #1
    Member
    Join Date
    Feb 2005
    Location
    palm coast florida
    Posts
    78
    Corvette(s)
    1985 two-tone silver/graphite z51 auto
    Post Thanks / Like
    Rides
    0

    Default alternator case refinish -

    while my NCRS days are long gone, I still strive to keep things looking "factory." I recently rebuilt an alternator for my 85 daily driver, and tried something, while it may not be unique, was something I stumbled across during the case refinish. i know bead blasting may be controversial, but none the less, I did bead blast the case. I have a small blasting cabinet, and the medium is TP Tool's Speed Bead Abrasive (80% glass, 20% aluminum oxide) - pressure at 80psi. cleaned the case, and as noted, typical bead blasted finish. this is where I tried something new - new to me anyway. I used a small piece of "white" scotch-bright and a little Wenol polishing compound (red tube). it was a real light polish - kind of like cleaning the wife's fine china. the scotch-bright/wenol took the freshly blasted look - both texture and color back to, IMO, a pretty decent, OE factory look. I'M NOT TRYING TO SAY THIS IS CORRECT OR BETTER THAN ANY PROFESSIONAL RESTO, just looking for some feedback and comments. (there' a little color shift in the before/after photos, but you get the idea)
    img_0902-jpg
    img_0939-jpg






    BTW, what I've found, at least on my C4, the case is not an aluminum alloy, but it seems to be a zinc-aluminum alloy. what mix, I have no idea, but there seems to be only three ratios used in castings. it's too heavy and the color differs too much to be a straight aluminum alloy.

    BTWII - i picked up this alternator on fleabay as a spare for $50. the date code on this thing is one day before my original. not that it matters on a C4 daily driver, but what are the odds???
    Last edited by Joe C; 02-08-18 at 05:32 AM.

  2. #2
    Member LLC5's Avatar
    Join Date
    Sep 2004
    Location
    Wa.
    Posts
    2,266
    Corvette(s)
    98 black 6spd convert.
    Post Thanks / Like
    Rides
    0

    Default

    That looks really good, nice job and find.

    Did you clear coat it after the polish to protect it or leave it as is?
    Master Technician

    25+ year ASE Master Certified Tech

    22+ year Honda Master Tech

  3. #3
    Member
    Join Date
    Feb 2005
    Location
    palm coast florida
    Posts
    78
    Corvette(s)
    1985 two-tone silver/graphite z51 auto
    Post Thanks / Like
    Rides
    0

    Default

    Quote Originally Posted by LLC5 View Post
    That looks really good, nice job and find.

    Did you clear coat it after the polish to protect it or leave it as is?
    no clear coat. the wenol contains some sort of sealant, so the finish should look decent for some time period - Wenol Metal Polishes, Wenol Red

  4. #4
    Moderator bill81vette's Avatar
    Join Date
    Jan 2004
    Location
    Troy,NY
    Posts
    4,162
    Corvette(s)
    1981 dark blue metallic
    Post Thanks / Like
    Rides
    1

    Default

    Nice!!!
    I'll try this on mine!!?

    Sent from my XT1650 using Tapatalk
    Bill and Gail...save the wave
    NCRS member 42415
    1981 St.Louis car #2735
    all matching numbers

    born Sept 18,1980
    Cruisefest 2008
    Cruisefestous 2009
    Cruisefest 2010
    Cruisefest 2011
    Cruisefest2012



    Without Trucks......
    You would be Hungry,Homeless and Naked!!!!!!



  5. #5
    Member
    Join Date
    Mar 2014
    Location
    Columbus, NC/NE Georgia
    Posts
    2,293
    Corvette(s)
    1997 boosted silver coupe
    Post Thanks / Like
    Rides
    0

    Default

    Actually the only way of telling what was alloyed with aluminum was used would be be working in GM's design group...

    Zinc-aluminum alloys have advantages:
    Zinc-Aluminum Foundry Alloys

    Pure aluminum is less common that magnesium or zinc alloyed with aluminum:
    The Difference Between Aluminum, Magnesium and Zinc Alloys - Die Casting Blog

    Glass beading always looks great and lasts...
    Whoosh, and blur

  6. #6
    Member
    Join Date
    Feb 2005
    Location
    palm coast florida
    Posts
    78
    Corvette(s)
    1985 two-tone silver/graphite z51 auto
    Post Thanks / Like
    Rides
    0

    Default

    couple more shots - a little "show-n-tell." another old case -- left to right - white scotch-bright/wenol, blasted (center), and before...
    img_0971-jpgimg_0972-jpg
    second pic - a little hard to show the texture/color difference - looks better in person. the WSB/wenol gives it that "re-skinned" look.
    Last edited by Joe C; 01-13-18 at 12:04 AM.
    Likes Mac liked this post

  7. #7
    Administrator Tom Bryant's Avatar
    Join Date
    Nov 2000
    Location
    Edgerton, Ohio, United States
    Posts
    7,001
    Corvette(s)
    1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
    Post Thanks / Like
    Rides
    2

    Default

    That's a real nice looking finish. I don't see how anyone could argue with that.



    Tom
    NCRS 1360.............SACC 2082.............C1 Registry..............L81 Registry
    1959 Chevrolet Corvette 1981 Chevrolet Corvette , 350 L81 automatic Frost Beige

Similar Threads

  1. Valve cover refinish
    By ghertzog in forum C4 General Discussion
    Replies: 3
    Last Post: 03-18-10, 12:11 PM
  2. Should I Refinish Dymags wheels
    By 91VETTEZR1 in forum Callaway Corvette Forum
    Replies: 1
    Last Post: 09-01-09, 08:33 AM
  3. Strip & Refinish Targa Top
    By rlvincent in forum C4 Technical and Performance
    Replies: 8
    Last Post: 03-29-09, 09:01 PM
  4. Z06 Refinish
    By BLUBYU in forum C5 Z06 Discussion
    Replies: 9
    Last Post: 10-17-08, 07:16 AM
  5. WHEEL REFINISH
    By CALLAWAY1988 in forum Callaway Corvette Forum
    Replies: 34
    Last Post: 06-19-07, 09:42 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •