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Old 03-30-2012, 07:48 PM   #481
dirty_sanchez
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I thought most of those old Triumphs marked their spot nearly as bad as the old Harleys. Good your bike is different.

Team, remember to never use a vinegar-smelling Silicone RTV for any sort of application where it'll come in contact with fuels or oils. This family of RTV's doesn't play well with liquids found in a bike-they break down and as they cure trapped acetic acid gas trapped in the engine will cause flash rust on everything, shortening the life of the engine.

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Old 05-02-2012, 03:22 PM   #482
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Just been checking the valves on my girlfriend's WR. It's the first time the cam cover has been off. There were traces of sealant on the shaped rubber gasket that sits between the head & cam cover, it obviously only needs a very light smear. What type of spooge should I use here?

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Old 05-02-2012, 03:54 PM   #483
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Originally Posted by dirty_sanchez View Post
I thought most of those old Triumphs marked their spot nearly as bad as the old Harleys. Good your bike is different.

Team, remember to never use a vinegar-smelling Silicone RTV for any sort of application where it'll come in contact with fuels or oils. This family of RTV's doesn't play well with liquids found in a bike-they break down and as they cure trapped acetic acid gas trapped in the engine will cause flash rust on everything, shortening the life of the engine.

Dirty
I won't use ANY RTV sealant in an engine. I've seen it come loose and clog oil systems. There are better sealants out there including Yamabond, ThreeBond, and Loctite products.
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Old 05-02-2012, 07:59 PM   #484
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Quote:
Originally Posted by clintnz View Post
Just been checking the valves on my girlfriend's WR. It's the first time the cam cover has been off. There were traces of sealant on the shaped rubber gasket that sits between the head & cam cover, it obviously only needs a very light smear. What type of spooge should I use here?

Cheers
Clint
Not sure what year the WR might be, but just for the hell of it I just not felt like checking the valves on my '04 YZ450. Just a rubber gasket sealed the valve cover. It's never leaked a drop on me-not even an oily dust stain anywhere.

Try to clean off any sealant residue from the rubber gasket and reinstall the gasket and valve cover.

Dirty
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Old 05-03-2012, 05:04 PM   #485
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It's an 08 250R. Valve check intervals are 40K km & the cover is a royal pain in the arse to get off. I've had this type of seal leak before so it's going to get some spooge of some sort.

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Old 05-03-2012, 05:59 PM   #486
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Clintz-if it's a rubber gasket, I'd go with some sort of "sensor safe" RTV. At your local automotive supply store confirm those words are listed somewhere on the package.

Confirm it does not smell like vinegar. Just beware though. In order for an RTV to give you a good seal, you have to assemble the parts within a few minutes. Doing so, you'll make sure the RTV bead does not skin over before the parts are assembled.

If the RTV skins over before the valve cover is reassembled, the RTV won't wet out the mating surface.

Gasket Eliminators do not have this skin over problem, but the mating gap is not overly uniform-thus the RTV suggestion.

Dirty
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Old 06-22-2012, 05:24 PM   #487
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Dirty,

I have read through this thread and cant find a specific answer. What would you recommend for gluing / bonding the oil level window of my DR650? The outer rubber appears to be a normal oil seal.



The old one had a black silicone type sealer holding it in place, and some of the Suzuki sealer sealing the groove between the rubber and the housing.

I did read that 518 is the stuff to use for sealing the case half's. Should primer be used?

Thanks!

David.
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Old 06-22-2012, 08:51 PM   #488
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Rowie-

Wowie, this is a good application.

I'd clean out the sight glass hole where it lives real good with a suitbly sized pick, flat head screw driver and finish it up with Qtip's until they come out clean. Then use a residue-free cleaner like electrical contact cleaner and let evaporate.

Do a quick spray of 7649 Primer N in the hole, let evaporate.

Draw out enough 518 on your finger and run a bead inside of the freshly primed hole. This thing is going to be pushed from the inside of the cover to the outside of the cover, so make sure there is enough 518 on the entire mating surface so that it offers some degree of lubricity to help you push this new sight glass into place. The only squeezeout you'll see will be on the outside of the case. Wipe this off so it doesn't become a dust magnet.

Let it sit overnight before oiling her up.

One of the KTM manuals I have suggests this very same sort of installation procedure.

For future reference if all you have on hand is an RTV to mount a new sight glass, make darned sure it doesn't have a vinegar smell. If it does, don't use it. Don't use it. The oil will break down the RTV and you'll have another leak on your hands to deal with. Go out and buy an RTV from the local Auto Shack that expressly says "Sensor Safe" on it. A Sensor Safe Black RTV would be a safe choice. I don't suggest using an RTV to mount a sight glass because it'll skin over too quickly with the thin bead it requires in this application.

Great question-Thanks!

Dirty
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Old 06-25-2012, 02:39 AM   #489
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Hey Dirty!

I was probably going to join this forum anyway, sooner or later. But, I registered for the purpose of ASKING YOU A QUESTION!!!

Feel important now?

Whatever - here goes:

We run 48 different plastic injection machines. The things are made by several different manufacturers, each has it's own characteristics.

We have more machines made by Van Dorn than any other brand. Each Van Dorn has an ejector cylinder that gives us pure hell. As with most hydraulic systems, the shaft coming out of the cylinder is a hard steel, with a mirror polish. I believe that shaft is stainless steel, but I have little idea what type of stainless it might be. The end of that shaft passes through a plain old cast iron ejector plate, then a stainless steel nut or bolt screws onto it. (some of the shafts end with male threads, some with female) This nut is constantly backing off, and that causes all sorts of problems with the cycling of the clamp.

In the past, I have cleaned the male and female threads, then used Loc-Tite blue. No luck, someone suggested that I use Loc-Tite red. Again, no luck. Only very recently have I become aware that there is a Loc-Tite Primer for use with stubborn applications. And, at about the same time, I became aware that not all blue are the same, nor are all red the same.

So - what do ya suggest here?

From reading a number of posts in this thread, plus my limited research on the internet, I THINK THAT I want to use some Primer N 7649, probably on both the male and female threads. We can, but don't really want to heat these surfaces to disassemble the things for maintenance. So, I believe that I want to use the OIL TOLERANT blue stuff - Loc-Tite blue, 243.

These cylinders are subject to a lot of stress - cycle times are as short as 30 seconds, and as long as 3 minutes. Each cycle, these cylinders are operated from 1 to 4 times, moving the ejector plate forward and back. In the smaller machines, that plate and the ejectors bolted to it weigh as little as 40 pounds, on the larger machines, as much as 120 pounds. Some of the mold's have spring loaded ejectors, which may add as much as 200 more pounds resistance to the weight of the steel being moved. The smallest ejector bolt is 3/4 inch, the largest is 1 1/4 inch.

Dirty - if you can give me a foolproof way to secure these cylinders to the ejector plates, you will save us so much aggravation - you just wouldn't believe it.

The single, most effective method that I have found so far, is to physically remove the mold from the machine, and poke a 3/4 inch impact wrench through the platen, to tighten that nut up. If I'm to believe the manufacturer, that impact wrench delivers over 750 ft/lb of torque. I can hammer on that bolt until I'm tired of holding the impact wrench - and that bolt still backs off after a few days.

HELP ME PLEASE!!!

Runaway1956 screwed with this post 06-25-2012 at 03:33 AM
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Old 06-25-2012, 04:26 AM   #490
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How hot does the connection get? GH
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Old 06-25-2012, 04:33 AM   #491
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How hot does the connection get? GH
The ends of the shafts are exposed to ambient air temperature, give or take a few degrees. "Ambient" within a factory setting means 110 to 150 degrees. They are often warm to the touch, but not "hot", as you would expect with an engine, or a motor. The cylinders behind the shafts get considerably warmer, sometimes - but still less than 200 degrees. All of the serious heat is a few feet away, at the injection barrel, where we use copper flake anti-seize compound for all the bolts.
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Old 06-25-2012, 05:51 AM   #492
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Runaway- Years back after doing a workshop at an injection moulding plant in Shreveport they brought me back into the shop to show me a very similar application. I offered up a fix and never heard a peep out of the guys about this particular application again. No news is good news, so the fix must have worked-otherwise I'm sure I would have heard something.

My first question relates to the hole.

Is is it a blind hole?

A blind hole has a bottom to it and doe not go all the way through. The opposite is a through-hole, like a spark plug hole.

Are you in Texarkana, TX, or Texarkana, AR? Asking because I think I'm going to have to turn the local Loctite guy loose on you.

Dirty
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Old 06-25-2012, 06:02 AM   #493
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The plant is actually in Nashville, Ar. I live in Foreman, Ar. I put Texarkana in my sig, because everyone in the world knows where that is.

As mentioned - some of the shafts end with male threads, others are female threaded. So - the female shafts will be a blind hole, the male shafts accept a nut instead of a bolt.

It would have been nice if all those machines were engineered the same way, but for whatever reason, they chose to use female threaded shafts on some machines, and male threaded shafts on others.

And - BTW - that injection molding shop in Shreveport may well have been our company. I'm not real sure of dates, but - it seems like 22 or so years ago, the company moved to DeQueen, Ar, from Shreveport. Before that, they were located further east on I-20 - can't think of the name of the town right this minute. The company has been around for awhile, and they have moved several times.

Our latest move was prompted by our prime customer, who closed up shop in DeQueen, and combined that operation with the one in Nashville.
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Old 06-28-2012, 06:53 PM   #494
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I love this thread.
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Old 06-28-2012, 07:28 PM   #495
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Runaway-

It sound's like a blind hole application-threadlocker is applied into the female hole and in this case I'd encourage you to put a quick shot of Primer N and some more threadlocker on the male threads and tighten her up.

I've reviewd blind hole applications as well as things to be careful of earlier in the thread.

If the Loctite guy out of Little Rock hasn't already given you a ring, he will. His name is Mike.

Dirty
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