Author Topic: Cleaning up an engine (paint)  (Read 2013 times)

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Offline Sporkfly

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Cleaning up an engine (paint)
« on: October 02, 2008, 06:39:30 PM »
Hi guys, I need some input because I'm a little frustrated with this. The PO painted my engine black, and poorly. I don't think it was even a high heat paint as it was peeling, flaking, bubbled and so on and so forth. I removed quite a bit of it simply with a brass brush, simple green and elbow grease.

For the stubborn stuff I picked up a real nasty aerosol paint stripper. I was wearing a mask, glasses, head gear and for some stupid reason I forgot to put gloves on. Let me tell you, that crap burned and the warning label said 'seek medical attention' for skin contact! Even with how potent and effective this stuff was overall, it didn't get it all. I could shoot some more on there, but my main issue is getting between the fins and the cylinder head (that's the more frustrating one). Any suggestions? There's still a bit of paint on there.

A good number of you have seen the state it was in when I got it, the engine is a lot cleaner now. I'll get some pictures of its current state up later:

« Last Edit: October 02, 2008, 06:41:13 PM by Sporkfly »
1977 CB550K
1979 GL1000 - Current project, winter '09-'10
1979 CX500
1976 Suzuki GT500 Titan

Offline kghost

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Re: Cleaning up an engine (paint)
« Reply #1 on: October 02, 2008, 06:42:39 PM »
Its a long nasty job...elbow grease and lots of it...I dunno any short cuts...short of stripping the engine apart.
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Offline Sporkfly

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Re: Cleaning up an engine (paint)
« Reply #2 on: October 02, 2008, 06:47:46 PM »
Its a long nasty job...elbow grease and lots of it...I dunno any short cuts...short of stripping the engine apart.

Engine is taken apart (second time)  :P. The first time I had it apart I didn't really consider how hard it would be to clean everything up once it was back together. Plus I was 16 (maybe 17?) at the time and this was my first jump into the world of motorcycle repair (and engines really) so I didn't spec a lot of things I should have. I know better now so I'm doing it right this time around.

Even with it apart there are some hard to reach spots, primarily the fins and the cylinder head like I said. I'm hoping the collective wisdom here provides me with handy tips and tricks for the tight spots on the head.
1977 CB550K
1979 GL1000 - Current project, winter '09-'10
1979 CX500
1976 Suzuki GT500 Titan

Offline kghost

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Re: Cleaning up an engine (paint)
« Reply #3 on: October 02, 2008, 06:50:13 PM »
Lots of scotchbrite pads and nylon brushes on a drill....

When they are apart I bead blast them....
Stranger in a strange land

Offline mikethejeepguy

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Re: Cleaning up an engine (paint)
« Reply #4 on: October 02, 2008, 06:59:33 PM »
Just an idea... I had to strip paint off axles on my Jeep before I painted them with POR15. Paint stripper worked... kind of, but took too long. I ended up spraying them with gasket remover and the paint pealed off quicker than a thong off a stripper on her third song... (well, 10 minutes or so anyway) brass wire brushes basically just took the goop out of nooks and crannies. Worth a shot? Although, my axles are steel, but gasket remover should be ok on the motor too.
'76 Honda CB550F, Dana-S'd, Uni filtered, HID'd, LED'd, and mildly cafe'd with many plans still.

Offline Sporkfly

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Re: Cleaning up an engine (paint)
« Reply #5 on: October 02, 2008, 07:02:39 PM »
Lots of scotchbrite pads and nylon brushes on a drill....

When they are apart I bead blast them....

That's exactly what I would do if I had access to one  :(

The stripper took that paint off faster than the... Yeah, the stripper reference, took the gasket off too and no damage to the aluminum (tested this before covering all my castings with it). The stripper I have would definitely eat the paint off, but it's difficult to get it to spray in some spots.
« Last Edit: October 02, 2008, 07:29:02 PM by Sporkfly »
1977 CB550K
1979 GL1000 - Current project, winter '09-'10
1979 CX500
1976 Suzuki GT500 Titan

Offline kghost

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Re: Cleaning up an engine (paint)
« Reply #6 on: October 02, 2008, 08:40:51 PM »
Squirt bottle of MEK works good at softening paint.....
Stranger in a strange land

Offline XN

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Re: Cleaning up an engine (paint)
« Reply #7 on: October 03, 2008, 12:12:48 AM »
pealed off quicker than a thong off a stripper on her third song...

78 Honda CB750K
02 Yamaha V-star 650
02 Honda VTX 1800

Offline rhinoracer

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Re: Cleaning up an engine (paint)
« Reply #8 on: October 03, 2008, 02:14:51 AM »
I had the same exact problem, wasted in total more than 40 hours of my life trying to clean and strip the top end including the black paint from the fins, even scraping it with a metal pick fin by fin. Then got hold of a borrowed bead blaster and in 20 minutes got the cylinders, head and cover clean and satin bright.
Baja native.

Sd455

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Re: Cleaning up an engine (paint)
« Reply #9 on: October 04, 2008, 04:49:54 AM »
Try Rock Miracle on a small inconspicuous area. It works great. Make sure it doesn't damage the metal.

http://www.rockmiracle.com/

Offline Sporkfly

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Re: Cleaning up an engine (paint)
« Reply #10 on: October 04, 2008, 07:11:59 AM »
Just ordered a $10 gun and 80 grit bead from Harbor Freight. I'll be making a blast cabinet from a rubbermaid box, some heavy plexiglass and replacement cabinet gloves.

Hopefully a one time use Harbor Freight gun does the trick.
1977 CB550K
1979 GL1000 - Current project, winter '09-'10
1979 CX500
1976 Suzuki GT500 Titan