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Engine Painting w/o Disassembly & Paint Type

Discussion in 'Early CJ5 and CJ6 Tech' started by Focker, Jun 6, 2015.

  1. Focker

    Focker That's a terrible idea...What time? Staff Member

    I'm wondering how many out there have painted running engines without taking the motor apart?
    How did you clean or prep it for paint?
    What would you do differently?

    Pictures or links encouraged.
     
    Mark T. likes this.
  2. Glenn

    Glenn Kinda grumpy old man Staff Member

    Pressure wash, spray on degreaser and then pressure wash again.
     
  3. 69Willys

    69Willys Las Vegas, NV

    I've been contemplating the same idea. I think my motor is a good candidate for it because it's bone dry on the outside and has no oil seeping from anywhere. I want to brush the paint on, but I don't think there is a brush on Buick green. I'm thinking wire brush and TSP or something similar for prep. I'd remove and spray the valve covers.
     
  4. Daryl

    Daryl Sponsor

    Hard to paint a running engine because the fan blows all the paint onto the firewall.....Just clean it up and tape off everything that you don't want to paint. Most times it is a great time to pull it and change all the gaskets and motor mounts. That is what my Grampa always called a spraycan rebuild.
     
    tripilio likes this.
  5. Focker

    Focker That's a terrible idea...What time? Staff Member

    Thanks Glenn.

    Yes.
    I'm actually planning on pulling the whole motor out. Drain the oil so I can turn it upside-down and do a complete paint job. I also want to paint the engine bay.

    Yeah, I'd like to change most of the gaskets. My fantasy would be to open up the block and go through everything.

    "Spraycan Rebuild"...I like it!
     
  6. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor


    My fantasy would be to leave it alone and hope it runs until I'm dead.
     
    Stano316 and tcfeet like this.
  7. wrhirzel

    wrhirzel Member

    I painted the engine and the engine compartment without removing the engine. I stripped the engine down, cleaned it with degreaser and brake cleaner, and painted using a brush, POR 15 (Buick green) for the engine, POR 20 (silver) for the exhaust manifolds, and Rustolem (primer and black) for the engine compartment.

    [​IMG]

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    Last edited: Jun 7, 2015
    1947cj2a, t4halo, Stano316 and 2 others like this.
  8. Focker

    Focker That's a terrible idea...What time? Staff Member

    That's fantastic, great job...Just what this thread needed!
     
  9. Greenshirt82

    Greenshirt82 The Old Girl - '69 CJ5

    That's sweet! On my "to do" list.

    Tim
     
  10. 69Willys

    69Willys Las Vegas, NV

    Awesome! I need to get some POR! Great job!! How is it holding up?
     
  11. wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

    I'd consider pulling the front clip off for ease of access to all the nooks and crannies.
     
    Stano316 likes this.
  12. Focker

    Focker That's a terrible idea...What time? Staff Member

    If I do this without pulling the motor, I'll pull off the hood, fenders and grill. Easy stuff.
     
  13. dubc56

    dubc56 Member

    Was the original f-head just gloss black? Mine has shades of dark green beneath the grease....that Buick green looks tremendous though!!
     
  14. wrhirzel

    wrhirzel Member

    The POR paint has held up well. It's been on the engine for 2 years. Absolutely no chipping or flaking on the engine. Had slight flaking on a couple of spots on the exhaust manifold a year or so ago. I touched it up and have had none since.
     
  15. 69Willys

    69Willys Las Vegas, NV

    Did you brush the valve covers as well? It must really level out very well...
     
  16. Jonbbrew

    Jonbbrew Member


    Nice job! Did you have to take all the rust off the manifolds to paint ? How did you do it?
     
  17. wrhirzel

    wrhirzel Member

    I used a paint brush on everything, including the valve cover. I stripped all of the old paint off of the valve covers using a wire wheel on a cordless drill. On the exhaust manifolds I cut the stove off of the passenger side, and cleaned them up with the wire wire wheel also. The parts I could not reach with the wheel, used used a small stainless steel hand brush.
     
    Last edited: Jun 9, 2015
  18. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Just a contrary comment -

    IMO it's not that much more effort to pull the whole shebang from the Jeep and paint/prep with it on the garage floor, a pallet or whatever. You can leave the transmission and transfer case attached, remove the grille and front fenders, (the "front clip") and pull the engine with a cherry picker or chain hoist. When I outfitted my garage, I put a truss in the ceiling and mounted a chain hoist for jobs like this.

    A warning that this make the "might as wells" just that much more tempting. Things like seal and gasket replacement are very easy once the engine and transmission are out of the Jeep. May as well split the engine and transmission and inspect the clutch. May as well replace the throwout bearing, now that you're in there. Etc etc etc.
     
    tripilio, Mark T. and OrangeCJ5 like this.
  19. Greenshirt82

    Greenshirt82 The Old Girl - '69 CJ5

    Where is that "like" button? Wish I had a truss...

    tim
     
  20. Focker

    Focker That's a terrible idea...What time? Staff Member

    I'm going to rattle can my 225 V6...Any idea how hot they get?

    Would I get thumped for using Chrysler Orange by Rustoleum? :whistle: