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What did they do. ???

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MagMan

01-25-2005 11:31:11

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I went to the machine shop yesterday to check on the progress of my winter project. Its been there for a few months and I am getting kinda ancy to get my motor checked. Any ways they finally got to the head and block and cleaned them . I maybe Nuts But They looked Brown to me. And not painted with primer or anything either. Anyone know what they may have done to make them look like that? THANKS JON

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gusc

01-25-2005 14:46:46

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Re: What did they do. ??? in reply to MagMan, 01-25-2005 11:31:11

If it is rust and I suspect it is. This has happened to every block I ever had cleaned.

I stopped removing rust years ago when I discovered latex base rust converter. It changes the rust to a hard black substance that can be painted or left alone if you want black. The best part is that it stops future rust. The problem with removing rust is that it just comes back unless you use an elaborate metal treatment process. Rustoleum is worthless, no better than plain paint.

Rust converter is so easy to use you will wonder why you didn't use it years ago. It is expensive but available at WM. WM has different brands but it must be latex base. One brand is "Extend" and is made by Loctite Co. Latex base converter is very thick and a creamy color

If you must remove rust the acid that is used in swimming pools, Hydrocloric I think, works very well and is inexpensive. It is, however, very dangerous and the metal must be washed thoroughly and treated immediately because it starts to rust instantly.

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CNKS

01-25-2005 14:26:50

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Re: What did they do. ??? in reply to MagMan, 01-25-2005 11:31:11

You are going to paint it aren't you? Use a wire brush on an angle grinder or drill, then clean it good with wax and grease remover. I wouldn't feel safe having a machine shop clean and prime, as they aren't in the paint business. Same with coating with oil, it all has to come off prior to paint anyway. Flash rust, due to the hot tanking should be easy to remove. Use epoxy primer before topcoating.

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MagMan

01-25-2005 16:15:15

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Re: What did they do. ??? in reply to CNKS, 01-25-2005 14:26:50

Well I see but the problem is I dont have heat in the shop. So I will not be doing any painting any time soon with the winter weather maybe in may. Or if we have a freak warm up in the next few months. I highly doubt that one. So I guess my only choice is to oil her down I guess untill spring. Then clean it all off and paint. Unless anyone has any better ideas. Then again my parts still need to be magnafluxed any ways so maybe there no good any ways. JON

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CNKS

01-25-2005 14:31:39

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Re: What did they do. ??? in reply to CNKS, 01-25-2005 14:26:50

The oil tractor vet mentioned was inside the block, so disregard my oil comment.

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Opa A

01-25-2005 11:58:21

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Re: What did they do. ??? in reply to MagMan, 01-25-2005 11:31:11

Hot tanking of castings will leave the metal with a brown tinge especially if their solution is a bit old, many shops will give the heads a quick bead blast to remove this, they don't bead blast blocks because it is too easy to have some left trapped in oil galleries, obvious what the blasting media would do to bearings if it got into them later. I usually wash the block using hot water with lots of dish soap. If you can get a long round bristled brush to go through the oil galleries, sometimes you'd be supprized at what is still in the galleries. Blow dry the whole block completely with compressed air. It will still have a brown tinge but paint will stick to it just fine. Hope this helps.
Note: good idea to run a brush through the cross drillings in the crankshaft also.

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the tractor vet

01-25-2005 11:41:16

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Re: What did they do. ??? in reply to MagMan, 01-25-2005 11:31:11

Either they HOT TANKED IT OR BAKED IT and they will rust real fast after they are cleaned but they don't care it's your problem now When i was fixen tractors full time the machine shop that i used would put a lite coat of oil on the machined surfaces so rust would not form but they were fussy and they did care. As for the out side your going to paint it anyway but the cleaning takes off the primer that was on the inside of the block it's not that big of a deal but if you want the inside sealed then you will have to DIY.

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Red Dave

01-25-2005 12:02:23

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Hey Tractor Vet in reply to the tractor vet, 01-25-2005 11:41:16

What did they use for that sealer. It always looked a lot like a product we use at work called "Glyptal". Often wondered if it was the same.

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the tractor vet

01-25-2005 12:13:53

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Re: Hey Tractor Vet in reply to Red Dave, 01-25-2005 12:02:23

What sealer, oh you mean on the inside of the block . I am not real sure on that but you could be wright , we have used rustolium primer but after time the detergant in the oil would soften it and it would come off but that was way back when i was a kid then we started grinding the inside of the blocks and polish them so oil would return to the pan faster and also lighten up the blocks a bit.

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