Putting cast iron rear together.

[jbollis]

I have a couple questions on the reassembly of my cast iron rear.
1. Are there any tips or tricks on making sure the new gaskets will not leak ?
2. Is it better to paint the rear in pieces or as a whole after assembled ?

Thanks JOE

I use Permatex Ultra hi-temp on the rear cover, no gasket. If you know how to do it right it's better than a gasket. One tube will do more that 6 covers and will not leak.

Pump gasket.....very thin bead of #2 on both sides.....clean your pump and case surfaces....do it right and it will not leak....gasket alone is not enough.


I paint as a whole, then remove rear cover and clean and paint it separate, then use nice fasteners for a quality finish.



Scott

[jbollis]

Thanks,
I have everything down to bare metal. I use a razor scraper (inspection sticker scraper ) on all the gasket surfaces. Then wire wheel. Then I file around everything, especially the bolt holes on the covers to make sure they are leveled out.

SCOTT
By #2, do you mean clear silicone?

And that looks nice. I just cant decide on painting mine black or yellow. For now it will be black as I am going to put a coat of POR-15 on it. Later I will either use some POR chassis black, or use the hardnose yellow.


JOE

[Matt G.]

Make sure the rear cover is flat and all the old gasket material is removed, and it'll seal with no gasket sealer required. I have always installed my hydro pump gaskets dry (after very thoroughly cleaning both mating surfaces) and I've never had one leak; I've done at least 6-8 of these...

If you have your heart set on using RTV, don't overdo it. It will do more harm than good if you use too much. I've had a couple of tractors in which excess RTV got in places it shouldn't have, and it caused a connecting rod failure in the KT-17 of a 782 I bought (and got cheap because of the blown engine).

I would also paint it whole. When I do mine for the 1872, I'll paint it assembled, sans brake parts, and then paint the brake stuff separately and put it on. I'll also remove the top cover and fill with Hytran after the paint has had a chance to dry. I'm not sure what you're using for paint, but another reason to paint after assembly is that any Hytran you get on the fresh paint might bubble it, especially if you either used rattle cans or didn't use hardener.

Originally Posted by jbollis

Thanks,
I have everything down to bare metal. I use a razor scraper (inspection sticker scraper ) on all the gasket surfaces. Then wire wheel. Then I file around everything, especially the bolt holes on the covers to make sure they are leveled out.

By #2, do you mean clear silicone?


JOE

NO!


Permatex #2.


Clean with denatured before applying any sealant or gaskets.

Scott

[squatch]

Permatex #2 "form-a-gasket". Comes in 4 different #s that all have different properties. Alcohol is the solvent and for cleaning your hands. Old school stuff but still the best for some applications. #2 is a great gasket tack/sealer. RTV silicone is way overused in my opinion. Contrary to poular belief it doesn't stick well in many applications and most varieties are not very oil/fuel tolerant. In most cases especially RTV these chemicals are meant to be gasket replacements not sealants.

I've swapped, removed, or replaced more than a dozen pumps in the last year. Every one I've taken off leaked, one side of the gasket was wet. Don't know if the gasket shrinks or if they don't compress enough to start with. #2 solves the problem, my tractors don't leak and won't leak.

On the RVT, it has it's purpose and it's not a fix all, never said it was, I did say you need to know how to use it. I'm not paying $8 for a rear cover gasket everytime I need to take one off.


But hey, what do I know?

Scott

[jbollis]

SCOTT,
Can you send me your email address. I have some questions I would like to ask you.

bollis@zoominternet.net



Thanks joe

[squatch]

Scott, No poke at you. Just trying to clarify for those that aren't familiar with the old stuff, many aren't. They see "permatex" and think RTV. The rest is just my .02. I'm on so many auto forums where people constantly reply to "just use RTV". Often this is the wrong sealer for the app they are recommending it for. It's all good stuff when used in the proper place.

[TheSaturnV]

I just did mine with a new gasket, no sealer. I torqued it to 25lbs in a zig-zag, then circular pattern for the final 5lbs. We'll see if it leaks this summer.