Author Topic: son of a b!#$% (Read 18438 times)

F-Red · « **Reply #30 on:** March 04, 2015, 12:52:41 PM »

I'm sorry to hear about your cases, Rock. Jerry is right on about aluminum and those temps. I do know the powder coating industry, is working with UV curable powders. No heat!

dem3500 · « **Reply #31 on:** March 04, 2015, 12:56:46 PM »

Well there's a lot of them out there. With a quick search I found a few that are listing prices specifically for ATV motorcycle engine cases. If there's people out there listing prices then there is a lot of people that have in fact coated cases without problems. Like I said I have coated clutch side cover and didn't have Amy problems with my water pump bearing and I bet that cover sat in the oven for 3 hrs. As soon as I can get my hands on some crap cases I will experiment.

d-rock · « **Reply #32 on:** March 04, 2015, 08:44:44 PM »

The bearings were all out.
I haven't contacted them yet but I'm not going to push the fact. They do a lot of work for the company I work for. Just going to cut my losses. I don't think it is worth fixing, all of the bearings fit loose now. Trans and crank. Maybe a set from ESR.

dem3500 · « **Reply #33 on:** March 04, 2015, 08:59:15 PM »

So I just talked to a guy that has a set of r cases that are indeed powder coated and his engine is and has been together and running fine. The bearings were a tight press fit as they should be

JesseA420 · « **Reply #34 on:** March 04, 2015, 09:11:12 PM »

u can probably just get steel bearing seats cut and pressed in for cheaper than a new set of cases.

d-rock · « **Reply #35 on:** March 04, 2015, 09:59:50 PM »

I wonder? if a guy had them anodized would it build it up enough to make the bearings tight?

Skeans1 · « **Reply #36 on:** March 04, 2015, 10:03:37 PM »

For 500 bucks kind of hard to beat the price for new.

udontknowme · « **Reply #37 on:** March 04, 2015, 10:50:35 PM »

Quote from: dem3500;50972

Yes 400 deg. It would be in the oven for around 2 hrs, possibly more. Which (as far as I know) is below the temp that would cause any metallurgy change in the metal.

not sure what temp the changes occur. probly alittle above 300 like jerry said but i also think it has alot to do with how long it stays at that temp. if you were welding a small area i dont think its going to affect it the same way and welding is far hotter than 400f. in some service manuals like ktm is says dont heat the cases much over 300f when replacing the bearings. im guessing its because something bad happens when they bake at extended periods over 300f

Jimbo45 · « **Reply #38 on:** March 04, 2015, 11:27:56 PM »

My cases were powder coated by the previous owner's engine builder. It has ran for the past 10 years with those cases. Maybe he/I got lucky?

mandom250r · « **Reply #39 on:** March 04, 2015, 11:44:09 PM »

I had my cases powder coated locally and sent everything to CT in bags for a full rebuild. I didnt have any problems and thinking of powdering or chroming a second set to have as a spare.

beobe99 · « **Reply #40 on:** March 05, 2015, 12:11:35 AM »

Quote from: d-rock;50996

The bearings were all out.
I haven't contacted them yet but I'm not going to push the fact. They do a lot of work for the company I work for. Just going to cut my losses. I don't think it is worth fixing, all of the bearings fit loose now. Trans and crank. Maybe a set from ESR.

Considering it's work related in a sense, I wouldn't push it either, smart!. Talk to your Co. owner / Manager before calling them if your relationship is solid. Either way let the PC Company know what happen so it doesn't happen again.

udontknowme · « **Reply #41 on:** March 05, 2015, 12:29:24 AM »

anyone know what series of aluminum the cases might be and if its tempered at all ? for aluminum to anneal i think it would need to be more like 600f-1000f depending what kind it is but thats not to say it wouldnt start warping or change shape at a lower temp. then factor in that it was in a oven for several hours

dem3500 · « **Reply #42 on:** March 05, 2015, 08:00:05 AM »

annealing of aluminum is is in the 350deg-400deg range depending on the type of aluminum. i really dont see a structure built like an engine case warp at all due to all the inernal gusseting that the part naturally has. ive done a lot of searching on this matter and have come up with nothing but a whole ton of people that have powder coated cases and have not have any problems. as soon as i can get a hold of some junk cases i will experiment on them.

ccaiazza · « **Reply #43 on:** March 05, 2015, 08:07:52 AM »

I was told you need to use only low temp powder coat, or you will have problems!

Pumashine · « **Reply #44 on:** March 05, 2015, 09:29:41 AM »

Seems to me if the cases have a looser fit on the bearings the rest of it would be sloppy also. I am glad I never heat my cases past 200. Paint case friendly.