340B Rain Flapper

jgp12000 · Jun 4, 2020

I just got a new muffler with a rain flapper and wondered what is the proper direction for it to open toward driver or away from driver ?

Janicholson · Jun 4, 2020

Away if you do not move the tractor on a trailer at highway speeds. toward you if you do. (catches rain and deflects it down into the engine at
speed in rain) or sideways if some of both (kinda also pushes a little exhaust to the side) or if you park the tractor in a single position
outside, consider the direction of prevailing wind, and turn it so that wind closes the cap. Jim

jgp12000 · Jun 4, 2020

It never leaves the property I was thinking toward me so I could see it but maybe sideways is best to get fumes away from driver in my case? I just wanted to do the norm but what you are saying makes since if your trailer the tractor.

Janicholson · Jun 4, 2020

there is plenty of opinion, but no norm. if you choose, just explain why and stand on the issue firmly, it is your tractor. Jim

jgp12000 · Jun 4, 2020

my tractor buddie just gave me another scenario he said facing rear so a limb can't rip it off ?

jgp12000 · Jun 4, 2020

thank you

rustred · Jun 4, 2020

lol! ya used to tell my dad that all the time, "stay away from them trees". I would put a new muffler on his 560 and he would get it bent.

rlp in Co. · Jun 4, 2020

Mine opens to the front. I want it to
deflect as much exhaust away from me as
possible! I also extended the exhaust above
the height of the cab. I want to save as
much of what little brain that I have left!

SVcummins · Jun 4, 2020

Point it to the rear and the smoke will go forward to the front it
goes back

55 50 Ron · Jun 4, 2020

My preference is no flapper - just a tight fitting can to "plop" on there. I know that's
inconvenient. Certainly "to each his own" as the saying goes.

jal-SD · Jun 4, 2020

My preference is to the side so exhaust
gets as far away from my body, face &
eyes as possible. Hot hard carbon & rust
flakes coming out of the pipe as exhaust
particles can be rough on body parts.

Steve@Advance · Jun 4, 2020

What ever direction you decide, I would still not trust it to keep all the rain out.

Caught out in the rain, overnight, yes, but for outdoor storage it needs a bucket.

Even with a bucket water can still find it's way in, tracking down the muffler, into an upward pipe connection, etc.

TimWafer · Jun 4, 2020

(quoted from post at 23:10:18 06/04/20) my tractor buddie just gave me another scenario he said facing rear so a limb can't rip it off ?

Unless your backing out from under a tree! :lol:

SVcummins · Jun 4, 2020

Broke the original John Deere rain cap off the 4320 stacking
hay. had I known how much those big caps are worth now I’d
have hung it on my wall

wingnuttx · Jun 4, 2020

Jgp12000....... Matter of preference. I place mine with cap opening to the front. If I get tractor in a bind it is less likely that I get some degree of diesel
fumes in my face. I bush hog fields with good fence lines so don't need to consider tree branches. If so , I would turn the rain cap 180 deg with cap
opening to face the rear. That way you are less likely to damage the cap by a branch.

Gene Davis (Ga.) · Jun 4, 2020

One thing not mentioned here. If the rain cap is facing forward when hauling a tractor with a turbocharger it will
blow up and catch the wind and there is a chance of it windmilling the turbo with no oil going to the
bearing/bushing and destroying it. We had this happen on a Cat loader at the mine I worked at years ago when they
moved it on a long trip.

Leroy · Jun 4, 2020

Best position is middle of scrap pile so you will not feel like digging it out again and putting it back on. That is where ours went 40 years ago. Rattle all the time and will not shut to keep rain out.

Ian Beale · Jun 5, 2020

The ones we get now seem to have a poly sleeve in the pivot.

I walked into our local parts store to hear a customer being shown one say "No more rattles!"

Leroy · Jun 5, 2020

Piviot was not where the rattle was. It was the flaper hitting top of exaust pipe between each cylinder firing at idle. Would not be enough exaust to keep them open all the time. At full speed stayed open, not at idle. Newer bigger engines with more cylinders and faster idle possibly not so much as older smaller slower running engines. No way can they make a cushion between flapper and pipe, anything they would try would burn up.

Rich'sToys · Jun 5, 2020

I've seen 2 cylinder John Deeres do that--drives a person crazy! I won't put one on a John Deere, but most of my 4 cylinder tractors have them.

DoubleO7 · Jun 5, 2020

Someone needs to invent one that rides on the infamous "muffler bearing" so that it rotates around to suit the wind and branches and breathing air quality desired!

Leroy · Jun 5, 2020

Farmall H was same way

BarnyardEngineering · Jun 5, 2020

(quoted from post at 13:30:31 06/04/20)

(quoted from post at 23:10:18 06/04/20) my tractor buddie just gave me another scenario he said facing rear so a limb can't rip it off ?

Click to expand...

Unless your backing out from under a tree! :lol:

That's why you mount it sideways. Can't move sideways into a tree, so it can't catch.

DR. EVIL · Jun 5, 2020

Even though they are called "Rain Caps" I agree, they do a lousy job of keeping rain out the the exhaust
pipe. But there's HUNDREDS of other places rain can get into the guts of a tractor and do harm, and
nobody here has mentioned that.
I run stainless steel straight pipes on both my FARMALLS. Now just keep your opinions to yourself, I
don't care what anyone else thinks. I also have a Stanley muffler for each tractor that is too tall to
get in or out of my shop door, that's why the shorter stainless pipe. The rain cap does do a good job of
holding the heat in the exhaust manifold and cylinder head. Nothing like a cold draft of air to shock the
exhaust valves and warp them. Guy that does my engine machine work is only about 20 miles from the Osh
Kosh Air-Venture airport. He told me in one week he reground the valves in one old 1920's vintage plane 5
times because the exhaust ports were so very short, you could see the orange exhaust valves in the
running engine, but they cooled so fast when shut off they warped too bad to let the engine start.
The straight thru IH mufflers really didn't hold much heat in the manifold & head either.

340B Rain Flapper

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