What pressure radiator cap????

[Diezel_Cowboy]

My truck has a 16psi cap........and when i went to get a replacement the stealership guy showed me in his book it said that my truck should have a 7psi cap! What pressure cap do you guys have?, what is the stock cap rated at?

 

[F350camper]

13psi on mine

 

[budtoh3zo]

13 on mine

 

[The Warden]

I've got a 13 psi cap on mine. I've heard from some other board members that it's a good idea to put a 7 psi cap on, and that the lower system pressure helps keep cavitation in check. But, never tested the theory myself...

 

[Dsl_Dog_Treat]

Found out the same thing with mine. Went to Napa and they showed a 7# and a 13# cap for mine.
I went with the 13# for the ole gal.

Ron

 

[Diezel_Cowboy]

OK thanks for the response. But what is the advantage of going with a higher pressure cap? Since it calls for a 7# and I just replaced the radiator i am going to put a 7# on it but i am wondering if there is an advantage to going with a higher pressure cap since none of you are running the 7# cap. Anybody??

 

[smokin_stroker00]

They told me that higher lbs cap will help move fluid to the heater core

 

[smokin_stroker00]

oh one other thing I think the higher pound cap will raise the boiling point of the coolant

 

[Mike]

Originally posted by smokin_stroker00
oh one other thing I think the higher pound cap will raise the boiling point of the coolant

Thats the right answer.

 

[smokin_stroker00]

Originally posted by 95_stroker
Thats the right answer.

I knew if I tried hard enough I would get something right

 

[towcat]

All my towtrucks have 7lb caps in them. all my pickups have 7lb caps too. it is true that 13ls cap raises the boil point but the stresses it puts on a cooling system that big will eventually rip apart a radiator. I have pulled hard over the sierras and through the cont. divide and never had a overheat. To me its a matter of personal preference, i figured that if the big boys are running 7lb systems on big OTR rigs, there really any reason I need to stress out the cooling system on my baby diesel.

 

[smokin_stroker00]

The higher pressure caps test the frost plugs.
I was having problems with the heater on a 84 gasser they told me to put a higher lbs cap on so I did replaced a couple of frost plugs and made the rad leak.


But the up side is I am glad it happened at home instead of on the road