Author Topic: About engine painting, polishing and the like. (Read 3051 times)

Raul CB750K1 · « **on:** December 10, 2005, 01:33:33 PM »

I was cleaning today some parts of my CB350 resto. I already removed the gasket compound with a chemical sprayed on them. Some assh·$e had used gasket compound also on the centrifugal oil filter cover. I gently sprayed the chemical on it, let it seat and went along with other part. When I looked again at the engine right cover, the paint was bubbling! I didn't know it was painted, it seemed just grubby! I sprayed the whole cover, and with a single paper towel I removed the paint. I don't know wether it was the original Honda paint or somebody applied it later.

I guess I will polish it instead of painting. The cylinder and head are now very clean but a little dull. Anyway, I don't think I will paint them.

BTW, I shouldn't have worked today on the bike: I broke one oil control ring while trying to remove it, and bore a part of the cylinder fin when trying to straighten it.

Raul

DiscoEd · « **Reply #1 on:** December 11, 2005, 05:35:26 AM »

Put down those tools and slowly back away from the bike!

Raul CB750K1 · « **Reply #2 on:** December 11, 2005, 06:35:18 AM »

HAHAHA that whas a good one Disco Stu, errr, Disco Ed. It's good that these things happen some times, that make you stop believing how good you are at things mechanical and put's you suddenly with your feet on the ground.

I remember when I was in US I was about to buy me a cool T-shirt at Country Clutter. It said: "DANGER. Dad with power tools"

Raul

Jim Shea · « **Reply #3 on:** December 11, 2005, 07:20:26 AM »

DiscoEd,
Are you an Anglophile (no it's not rude!)
English TV avatar, English cop with gun, got any English bikes/cars?
Jim.

DiscoEd · « **Reply #4 on:** December 11, 2005, 10:12:14 AM »

Quote from: Jim Shea on December 11, 2005, 07:20:26 AM

DiscoEd,
Are you an Anglophile (no it's not rude!)
English TV avatar, English cop with gun, got any English bikes/cars?
Jim.

No, but my 9th (or so) great grandfather was. Our first of our clan arrived here in the new world in 1629 and now they can't get rid ouf us.

Gotta tell you, I like you Brits overall. Have befriended many of you over the years. Like your TV shows. (even my 11 year old son likes those shows). I don't like your idea of indoor heating though.

Own a Land Rover Discovery (hence the DiscoEd thing). No Brit bikes though, but I've had my eye on the Royal Enfields and Triumphs for many years.

Regards,
DiscoEd

jaknight · « **Reply #5 on:** December 11, 2005, 02:04:59 PM »

HEY DISCOED,

Don't really want to go off topic, but I thought I ought to let you know.......

I bought a '68 Triumph Bonneville brand new. I loved the right now power that baby had and I loved the quick agile handling of that Bonnie ( if I thought about turning right, it went right ). I also loved the sound of nearly all the Brit bikes.

I hated the vibration and the oil leaks. Just for your possible future reference......

~ ~ ~ jaknight ~ ~ ~

DiscoEd · « **Reply #6 on:** December 11, 2005, 04:41:28 PM »

Quote from: jaknight on December 11, 2005, 02:04:59 PM

I hated the vibration and the oil leaks. Just for your possible future reference......

~ ~ ~ jaknight ~ ~ ~

After having owned the Land Rover, I thought oil leaks and vibration were a feature of all fine English vehicles.

Regards,
DiscoEd

Jim Shea · « **Reply #7 on:** December 12, 2005, 05:43:33 AM »

Oil leaks are not only associated with Brit bikes, ask any K series owner, except K8 of course! The vibration point is correct, they really are bone shakers, but that's part of the charm!
How come they sound like they do? Is that a characteristic of an old twin?
Oops, have to be careful, Raul gets pissed off when someone hijacks his posts!

Raul CB750K1 · « **Reply #8 on:** December 12, 2005, 06:05:10 AM »

Quote from: Jim Shea on December 12, 2005, 05:43:33 AM

Oil leaks are not only associated with Brit bikes, ask any K series owner, except K8 of course! The vibration point is correct, they really are bone shakers, but that's part of the charm!
How come they sound like they do? Is that a characteristic of an old twin?
Oops, have to be careful, Raul gets pissed off when someone hijacks his posts!

How can I get pissed off? I'm the #1 thread hijacker!!!!
BTW, I found a aluminium spray paint for 6 euro, an special offer from CRC. I'm gonna give it a try, painting a discarded part and let it get in contact with gasoline to see how it affects. Will post pictures...

Raul

Jim Shea · « **Reply #9 on:** December 12, 2005, 06:11:03 AM »

Raul,
Be interested to hear your experience on that. Will you test it for heat resistance?
But, please change your avatar, it gives me nightmares.

Jim.

Raul CB750K1 · « **Reply #10 on:** December 12, 2005, 11:23:47 AM »

Well, I may check the heat resistance. I will try to borrow a propane torch.
No way I'm changing my avatar. It's my personal hommage to such a friendly guy called Terry in Australia...

Raul

Jim Shea · « **Reply #11 on:** December 13, 2005, 01:51:56 AM »

Raul,
MrBlasty has the put Terry's face on the possum; what next?
Jim.

Raul CB750K1 · « **Reply #12 on:** December 13, 2005, 02:32:10 PM »

I finished my test about painting the cases with very bad results. Luckily the paint spray costed only 6 euro..

I painted the inside of the sprocket cover of my CB350. I masked everything but a little strip. As you can see in the picture, the result was terrific. Even the small numbers on the case could be visible after that.

I then poured a little gas over it. After five minutes it started to wrinkle. I just removed all the paint with my bare finger...

I think I'm going to leave the cylinders and head as they are, and polish a little the rest of the covers.

Raul

P.S: Jim, with this outcome it doesn't make sense to test the heat resistance.

DiscoEd · « **Reply #13 on:** December 13, 2005, 04:47:34 PM »

Raul,

Just out of curiosity...

How much time elapsed between the application of the paint and the application of gasoline?

Did you prepare the surface in any way?

Was this an Enamel or other type of paint?

What was the octane rating of the gasoline?

What is your favorite color?

(o.k. o.k.... please ignore the last two questions)

Regards,
DiscoEd

TwoTired · « **Reply #14 on:** December 13, 2005, 06:42:31 PM »

Quote from: Jim Shea on December 13, 2005, 01:51:56 AM

MrBlasty has the put Terry's face on the possum; what next?

I may regret this. But, I'm just happy other bits of Terry's anatomy aren't availble for "grafting" onto the possum.

I'm afaid "pop up" blocker wouldn't wouldn't be effective for sheilding my eyes.

scondon · « **Reply #15 on:** December 13, 2005, 06:55:18 PM »

I used VHT engine paint( rattle can ) and am pretty happy with the results. Gas runs off it like water. The paint would come off with soapy water before it was cured, but once I cooked the parts in the oven and ran the engine through a few heat cycles it's become quite durable. Terry mentioned he ruined his VHT paint job by spilling Octane Boost on it, but I don't plan on testing that out. Anyway, try some high temp paint and cook your part in an oven a couple times before giving it the gas test.

TwoTired · « **Reply #16 on:** December 13, 2005, 07:01:25 PM »

DiscoEd asks some very pertainent questions. Well... mostly.

Most rattle can paints are solids in a solvent carrier. It can take weeks or months depending on the paint formula for all the solvents to thoroughly evaporate. Until all the solvents are completely gone, gasoline, which is or contains solvents, can easily reliquify and suspend the paint solids. Even catalyzed 2-part paints are often applied with a solvent reducer, and these won't be fuel resistant until the reducer has evaporated and the paint is fully catalyzed and cured. Paint is a technology, too. Solvent paint cure from the outside in. Even though the surface feels dry to touch, the inner thicknesses may not have "outgassed" yet. And, as the surface does cure and become less porous, the inner layers dry even slower.

Elevated temps are often used to shorten the time for paint to get towards "Full Cure".

If, however, you used a laquer type paint, pretty sure gasoline will always effect it, even at full cure.

Cheers,

Dennis · « **Reply #17 on:** December 13, 2005, 10:46:49 PM »

Quote from: TwoTired on December 13, 2005, 07:01:25 PM

DiscoEd asks some very pertainent questions. Well... mostly.

If, however, you used a laquer type paint, pretty sure gasoline will always effect it, even at full cure.

Cheers,

The term "cure" really doesnn't apply to laquers. They just dry. Most paints change chemically after the solvent carrier totally evaporates and the cure conditions (usally temperature and time) are met.
With laquers the solvent just evaporates and the material becomes a solid, and with exposure to the correct solvents it becmes liquid again. there is no chemical change or actual cure.

TwoTired · « **Reply #18 on:** December 13, 2005, 11:19:55 PM »

Quote from: Dennis on December 13, 2005, 10:46:49 PM

The term "cure" really doesnn't apply to laquers. They just dry.

Jeez, and I thought *I* was a technocrat.

But, you are correct, of course.

Cheers,

Dennis · « **Reply #19 on:** December 13, 2005, 11:28:52 PM »

Quote from: TwoTired on December 13, 2005, 11:19:55 PM

Quote from: Dennis on December 13, 2005, 10:46:49 PM
The term "cure" really doesnn't apply to laquers. They just dry.

Jeez, and I thought *I* was a technocrat.

But, you are correct, of course.

Cheers,

But you do it so much better than I.
I just enjoy sitting back and watching you handle these technical questions.

Besides that my typing skills suck!

Raul CB750K1 · « **Reply #20 on:** December 14, 2005, 09:24:34 AM »

I thoroughly degreased the surface, and left the paint dry for 24 hours.

It's true that the paint only wrinkled when it was in permanent contact with the gasoline. I poured some on the upper part and, as it was not "soaked", it just evaporated and the paint remained. But I guess that if you have a leaky carb or petcock, the paint in the upper crankcase will get soaked too.

I may try leaving it "cure" or whatever for one week or so, sitting over the radiator. I once "cured" a PCB on the kitchen oven and it took forever to get rid of the chemical's smell...

Raul

Dennis · « **Reply #21 on:** December 14, 2005, 03:36:06 PM »

Quote from: Raul CB750K1 on December 14, 2005, 09:24:34 AM

I once "cured" a PCB on the kitchen oven and it took forever to get rid of the chemical's smell...

Raul

I'll bet you did that BEFORE you were married!!
Or if your wife was there, it took more than forever before you slept in your own bed again!

78 k550 · « **Reply #22 on:** December 14, 2005, 05:51:26 PM »

I have used this engine paint http://www.seymourpaint.com/ on my intake manifolds with great results.

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Author Topic: About engine painting, polishing and the like. (Read 3051 times)

Jim Shea

Jim Shea

Jim Shea

Jim Shea