Pressure Protection Valve

G'day all,

Was wondering if anyone can help me. When i fire up my k124cr there has always been a loud "hissing" noise coming from inside the centre dash. This hissing noise i have found out is coming from a pressure protection valve, there's a little hole in the top of the cylinder and air leaks out at a rapid pace. Once the pressure has built up, the air seems to stop leaking. Once i kill the engine, the air again leaks out until both my main air tanks are empty..... this doesn't sound right to me..... can anyone shed some light on this little sucker??

cheers
alex

adb, pretty sure that valve in your dash is your "tractor protection valve"

Do search on here for Kenworth Air diagrams as there has been several posted over the years..

Sounds like you also have leaking check valves in your air tanks as well..

Get the diagram first, & methodically go through the whole system.. would be My advice..

Year, chassis number, single or dual air system?

I'll email some pdf files to save you searching.

Posted by: hayseed Posted on: 11.07.2015 at 11:40:09
adb, pretty sure that valve in your dash is your "tractor protection valve"

Do search on here for Kenworth Air diagrams as there has been several posted over the years..

Sounds like you also have leaking check valves in your air tanks as well..

Get the diagram first, & methodically go through the whole system.. would be My advice..

Think you're spot on hayseed.....just don't know where to begin.....the pdf thing sounds the go...

Posted by: jimbo51 Posted on: 11.07.2015 at 14:39:38
Year, chassis number, single or dual air system?

I'll email some pdf files to save you searching.

Thanks jimbo51,

Its plated as a 1980 KW124CR, Serial number 405035... i'm pretty sure its a dual system as it has two long air tanks that run parallel with the fuel tanks.... there's also a couple of air tanks that sit under the battery box, but they never seem to fill up with any substantial amount of air....

thanks again..

cheers

alex

Alex, I used the email listed in your profile to send you some info but it bounced back. Out of date?

AdB

Gudday M8

FWIW

KW also have a large Purolater Secondary Engine oil filter
th@ looks simular to an airtank mounted under the battery box
also there is a small air tank th@ iz plumbd up for emergency parkin brake release

cya

also there is a small air tank th@ iz plumbd up for emergency parkin brake release

Not with the dual air system

Jimbo
Gudday M8

Me KW 1/2 truck as a prime mover from the factory
has a small tank mounted under passenger side floor
as a Emergency P/Brake release
Guess n tis set up for dual air system
presume n dual A/System is front n rear brakes on different tank n plumb n

BIDSTBC

cya

Posted by: jimbo51 Posted on: Today at 16:50:42
Alex, I used the email listed in your profile to send you some info but it bounced back. Out of date?

Yes sorry mate it's xxxxxxxxxx@gmail.com ::) ::)

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Posted by: Swishy Posted on: Today at 17:37:36
AdB

Gudday M8

FWIW

KW also have a large Purolater Secondary Engine oil filter
th@ looks simular to an airtank mounted under the battery box
also there is a small air tank th@ iz plumbd up for emergency parkin brake release

cya

Swish, these are the jiggers that I'm thinking of....