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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 05-11-2010
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The_Money_Pit The_Money_Pit is offline
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Default Need some help identifying this leaking part (Pressure Protection Valve).

so, I am tracking down air leaks, and I heard some hissing fromt he engine compartment. Found the below dodad leaking some air. Initially I thought just a small amount, that was until I sprayed some soapy water on it, and it is leaking like a stuck pig.

So first thing, looks like I could remove the cap and replace the seal. But two of the four bolts have broken.

So what is it?
And where do I get one?

Progressively closing in on subject.

30,000 feet


10,000 feet object in site


****, close enough already.
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Old 05-11-2010
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Default Pressure Protection Valve PPV KN31000

Welcome to the forum. You have a faulty Pressure Protection Valve.

Your coach has 3 or more of these and since they are prone to fail...order what you need plus some spares.
http://www.ryderfleetproducts.com/cg...uct_detail.jsp
Scroll down to post #5
http://www.wanderlodgeownersgroup.co...otection+valve
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Old 05-11-2010
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Default

Thank you giderich for the info, exactly what I was looking for. Picking it up in the morning at Napa.

This forum is great.
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Old 05-11-2010
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that PPV will go bad again and again,the heat kills it,keep a spare.
It controls the air pressure to the bulk oil tank.
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Old 05-12-2010
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thanks Randy I will also get a spare. very surprising what appeared to be a small leak was rapidly draining my air. using my aux air compressor for timing. Old valve - aux compressor would only get a 3 minute break before having to kick back on again to build pressure. New valve now it gets about a 20 minute break. When I fix a few more leaks it will probably double again.

Here is a little more info for those considering doing this repair.

1. The descriptions found at Napa and ryderfleetproducts describe the openings as 1/4". I measured both openings on the old PPV it measured closer to 1/2". This made me wonder if I was ordering the correct part, but the new one is also closer to 1/2". This must be a plumbing thing as the nipple(He, he) that I picked up at the hardware store is also described as 1/4", but is much closer to 1/2", maybe someone more knowledgeable about plumbing can add their 2 cents.



2. You may also need a 1/4" nipple(He, he) as when I removed my old valve the nipple came with it, and I didn't see anyway to remove the old nipple without damaging the threads. Found at any hardware store for ~$2.50. If you are going to have a spare PPV, then you may also need a spare 1/4" nipple(He, he).



I bought two in different lengths I ended up using the shorter one.


3. you need a set of allens to install the plugs also


4. might as well put some plumbing tape on the threads for good measure. $1 at all hardware stores.

5. the new one, the cylinder on top is slightly taller, and is so clean looks totally out of place in my very dirty engine compartment(old exhaust leak)

I ordered mine from Napa over the phone at 3pm, and even though they did not have in stock, they had it there next day 8am ~$33.00

PART # KN31000


http://www.napaonline.com/Search/Det...000_0215331955

http://www.ryderfleetproducts.com/cg...uct_detail.jsp
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Last edited by The_Money_Pit; 09-29-2010 at 06:19 PM.
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Old 05-12-2010
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Yep, that is one quarter inch pipe. Theoreticaly reffering to the inside diameter.
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Old 05-13-2010
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Maybe plumbers are using some new measuring system? Or maybe counting with a base number other than 10? Maybe plumber's crack is some sort of disease that affects working with measurements?



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Old 05-13-2010
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Quite a confusing issue. Here is a somewhat clear explanation.
Key point is a quote from them "Pipe sizes do not refer to any physical dimensions."

http://www.plumbingsupply.com/pipethreadsizing.html

And a handy visual reference I use to refrain from asking a counterman for a thingy.

http://www.plumbingsupply.com/pipe-fittings.html

Just to keep us on our toes, don't forget rules are different for tubing. [ pipe - does not equal - tube ]
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Old 05-13-2010
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So... I was up under the coach trying to identify which air dryer I have, because I was certain that the hiss that I heard coming from under the coach was coming from the air dryer.

So I was laying there with my bottle of soap and flashlight and I was liberally spraying down the air dryer and getting my second bath of the day at the same time.

I sprayed, and sprayed, and sprayed, but could not locate the stupid leak. Started poking my head, here and there trying to locate said "hiss".

So you will never guess what I found eventually making all the hissing. Allright you already guessed what it is going to be.

Thats right another PPV valve is leaking.




My question now is...

Are all the PPV on the coach the same pressure?
and I can use KN3100 on all the PPVs I find around the coach?

Pressure Protection Valve PPV KN31000
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Old 05-13-2010
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And wouldn't you like to get your hands around the neck of the guy who thought that plumbing up It could take days to change it out.
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