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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 04-28-2009, 10:42 AM   #1 (permalink)
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corroded engine cases and polishing

I've got the problem with corroded engine cases. I like the idea of stripping off the clear coat and polishing them, and also like the old school look of the polished cases anyway.
I've got some pretty good how-to threads from this site on the project, but the most recent was still over a year old. My question is what to expect after the clear coat is removed and the cases are polished. How do unprotected cases weather and wear over time and if theres alot of extra maintence involved now. Also, if theres any new products or procedures to do it since the last thread on the subject.

Thanks all.

Last edited by Bremsstrahlung; 04-28-2009 at 10:43 AM. Reason: typo
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Old 04-28-2009, 12:57 PM   #2 (permalink)
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I polished my side covers on my 1970 TR6R to a point where everyone thought that they were chromed. For maint I just rubbed them down after every ride with simichrome. Never had an issue maintaining the high luster. My T-100 has chromed side coves, so not an issue here.

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Old 04-28-2009, 01:13 PM   #3 (permalink)
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+1 on the Simichrome Polish
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Old 04-28-2009, 01:17 PM   #4 (permalink)
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i've never used simichrome, but i polished my engine covers last year and don't regret it at all. i use 'blue magic' to keep them looking new. to clean and polish them i used to use a rag and godd old-fashioned elbow grease, but i gound that a buffing wheel and my cordless drill work just as good, and much, much quicker! in fact, i am heading out to the garage today to polish my heel guard to match. i absolutely hate the process of polishing a piece, and everytime i do a piece i tell myself i will never do it again, then find myself polishing something else!
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Old 04-28-2009, 01:44 PM   #5 (permalink)
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this topic is relevant to my interests. i need to find a solution to my paint problem.s

500 miles into riding my brand new bonneville, i noticed my jeans caused the paint to rub off the engine case on the clutch side. now my black engine has an unsightly silver patch.
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Old 04-28-2009, 04:24 PM   #6 (permalink)
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Have fun sanding and polishing the black cases. I did my sprocket cover first. The paint came off easy, and it was relatively smooth underneath. I just touched it lightly with 400 grit, the went straight to the buffer wheel.

Of course, that was all the convincing I needed to proceed to the alt and clutch covers. I found the alt and clutch covers at least 10X harder to strip. I ended up softening it with aerosol aircraft stripper, and removing it with a 8" brass wire wheel in the grinder(while still wet). After trying several different industrial strength strippers, and all kinds of scraping tools, that's the only process that would touch it. It was a real mess. Under the powder, the covers had a very rough, pitted, sand textured finish. Lots and lots of sanding for those two parts.

As happy as I am with the results, I honestly only completed the job because it was halfway done. I would not do it again. Also, by the time it was all said and done....I probably spent nearly enough to buy chrome covers.

The guys with brushed covers are LUCKY. Some of them even strip and polish ON the bike.
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Old 04-28-2009, 04:48 PM   #7 (permalink)
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I want to second what dledinger said. I was going to strip all my black engine covers, but after doing the cam cover I realized I'd have to make a career out of it. I found polished cover kits about $100 off the dealer price on ebay. Well worth the money. You can sell the black covers to recoup some of the cost. The worst case scenario would be to half strip the black and quit. Then they're not worth as much.

The original post was about removing the coating on polished covers. There's a video, I think Youtube, where a guy from Australia strips and buffs.

Edit: The Australian guy strips and buffs his engine covers. Left unsaid it sound lewd, ha, ha.

Last edited by rmak; 04-28-2009 at 04:51 PM.
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Old 04-28-2009, 04:50 PM   #8 (permalink)
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Question Covers

Bummer ya'll dont like the black covers!. They are impervious to disimilar metal corrosion & other road hazzards. The chrome on mine has held up wondderful for 5 yrs! The clear coat is a problem tho. It starts w/ corrosion undder the casing bolts & goes from there. A nick/ gouge- the same. Funny I cant remember in my old Honda days that happenning! Different metal? I love the black & chrome & it still looks new~! Buds laquer- well there is very little left that looks halfway decent. Salt air doesnt help. Polishing seems like a lot of work? The upkeep seems the same. I wonder IF there is a different coating that can be used after stripping them down? The only difference on the old Honda's was that they used the same metal type on the screws as they did on the covers. The old philips screws were a bitch to get out w/o an impact driver. All replaced them w/ allen then - same metal I think?
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Old 04-28-2009, 05:21 PM   #9 (permalink)
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Quote:
Originally Posted by CAPTDON View Post
I wonder IF there is a different coating that can be used after stripping them down?
Chrome.
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Old 04-29-2009, 06:10 AM   #10 (permalink)
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