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Farmall & IHC Tractors Discussion Forum
:

gaskets vs rtv

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sgt bull

01-24-2006 21:03:43




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I know this may be a subject of controversy, but I'll broach it anyway.....when I started restoring tractors about 20 yrs ago, I thought rtv silicone was the greatest thing where clearance gaskets weren't used...then I was told that it was prone to coming apart inside and getting into oil passages and causing mayhem....so I quit using it and swore by gaskets for the next 19 yrs. Well, I get tired of new gaskets w/ sealer still seeping oil after a few yrs, and began considering the fact that most automotive manufacturers us RTV all over the place...So, I've gone back to it, just being very judicious in its application....I've coated a few gaskets w/ it as a sealer with good luck and I've even used it where there are steel shims, instead of gaskets, after adding a few shims to make up for the missing gaskets....Now, I'm finding that things that eventually began seeping w/ gaskets are remaining nice and clean and seep free...I'm thinking that's a good thing......Additionally, it makes reassembly a lot easier when you don't have to custom make gaskets or buy expensive dealer sets..what is your opinions on using silicone as a sealant or in lieu of a gasket entirely where you can?

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champspa

01-26-2006 13:32:49




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
locktite makes a product called Gasket eliminator it only hardens between two surfaces that's what I use on my tractor and on machinery I repair both type 515 and 510 are good . like 515 better



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riverbend

01-25-2006 16:29:13




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
I like a little rtv on gaskets that are not meant to come apart. It does a wonderful job of keeping the oil inside my Norton. Do be careful using it around oil ways or where it can get sucked into the idle passages on a carb.



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SGT K

01-25-2006 11:37:47




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
While you are here,,,,,,I would like to see some "progress photos" of the old H sometime.
Paul



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sgt bull

01-25-2006 17:20:06




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 Re: gaskets vs rtv in reply to SGT K, 01-25-2006 11:37:47  
progress?....well, its in the barn instead of the driveway...that is a start, right?...I reallyhaven't been doing much with it lately..i've rebuilt the carb, generator, water pump, electrical switch, distributor, seat assembly, brakes, and replaced every wire on it...it runs good,but it smokes and oil fouls plugs...carries good oil pressure, so hopefully i can just go over the top end and stop the OPEC support system from bankrupting me. I did a compression test...got 55 lbs per cyl +- 3 lbs..added oil to the rings and didn't get much difference... never did learn what it SHOULD be, but i'm sure 55 is low....hopefully it'll just be valves and guides, but I'll re ring it when i crack it open, if that's all it needs...I'll have to mic the bore to see what I really have when I get there.. That water pump was a NIGHTMARE. what a morphidite set up that is! Yeah, I broke the adjusting ring...had to find another pump to replace it, got it home and found that IT was broken too...so back to the parts yard for a third...it was good. Geez..there is a lot to be said for thermosiphon systems.....by the way, give me a call on my cell when you get a chance..I have some info for you re what is going on in D11 that you might find interesting..you may even know some of the players... call post for the 88 if you don't have it.

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Brownie 45

01-25-2006 05:05:31




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
Silicone sealers solve many problems, but should not be used in situations that involve oil passages in castings. I've seen an air compressor [air brakes] on a cummins engine with the bearings totally wrecked after 5 miles of road driving, after a gasket wasn't available, & silicone was substituted. Same with a flathead ford air compressor. Took all the rod & main bearings out.



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K.B.-826

01-24-2006 22:19:43




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
I always use a light coat of silicone on water pump/thermostat housing gaskets. Sometimes I use a very light coat on aluminum parts like engine timing covers, just to make it easier for the next guy to scrape the gasket off. I will never use it on somthing like a transmission valve assembly, out of fear that it will find it's way into an internal passage. Silicone by itself is actually reccomended for certain applications, such as oil bath chain cases on corn heads, ect. As you said, many manufacturers are going away from gaskets, I rebuilt a PTO assembly on a JD 7810 a couple years ago, a Loctite product called "Form in Place" is all that seals the PTO unit to the transmission housing. Just gotta use your best judgement.

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old

01-24-2006 21:25:50




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
I use it a lot on a lot of gaskets and where gasket just can't be found. I have also found it works good to keep bolts and nuts from falling off/out. It works better then lock tite because you can remove the bolt easy where as with lock tite it can be a so and so to get a bolt back out.



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Dave NE IA

01-24-2006 21:25:11




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 Re: gaskets vs rtv in reply to sgt bull, 01-24-2006 21:03:43  
Just like anything else good or bad--- application ---is very important. A friend uses 100% silicone from the local lumber yard. It is alot cheaper and he repairs tractors for a living. I do know that if you make a gasket and do not draw the bolts tight (thus leaving a area for a thick gasket)untill it gets harder takes care of the dificult ones. Before I learned that trick I drawed it up right away and actualy squeezed out the gasket so to speak.

I rebuild Carbs and magnetos and always use gaskets for those type aplications. Dave NE IA

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856 puller

01-25-2006 16:49:27




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 Re: gaskets vs rtv in reply to Dave NE IA, 01-24-2006 21:25:11  
i use gaskets when possible and add silicone in trouble areas. i use hondabond on areas where it must stay out of oil ,it has more body. the form in place stuff works well also



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sgt bull

01-25-2006 17:22:06




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 Re: gaskets vs rtv in reply to 856 puller, 01-25-2006 16:49:27  
What the heck is "hondabond?".....never heard of it? and who makes it?



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