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Old 08-24-2009, 01:13 AM   #1
jwe648
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Default Radiator Cap Presssure

I couldn't stand letting it set any longer...so today I took the ole' 74 for a spin thinking I would throw in some fuel along the way.. Ran out before I made the station (5 miles).. but that is another story. I put the gauge on the list...

Thinking I better check out other fluids I checked the coolent, fortunately it had some.. But, I found the radiator cap rusted and kinda resting on the neck.. better that a rag, I suppose..

Anyway.. anyone have a good guess as to what the Cap PSI is supposed to be? Running the CAT 1160....It does well with fuel!

Jimmy
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Old 08-24-2009, 01:51 AM   #2
prairieschooner
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Do you have a repair manual for the Engine? That is where I would start looking for the Radiator Pressure and Cap.
I have an '82 with Detroit 6V92 in it. I am going to add a Recovery Bottle but plan to use the old Radiator Cap. The idea here is that when you increase the pressure at the Radiator Cap, it increase the boiling point of the coolant. I did a Google search and it looks like 15 psi raises the boliling point by 45 degrees. I am not recommending 15 psi, just some of the info from my search. With our older Diesel Engines we need to be careful and not raise the Pressure by too much otherwise you can make other problems with Head Gaskets, Head Bolts, etc.
I would check with the Engine Manufacturer and go with their recommendations.
Looking forward to what you find out.
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2007 Yukon, 1981 CJ7 Laredo, 2002 Honda CRV, 1955 Thunderbird, 1952 Pontiac Sedan Delivery, 1952 Ford 8N, 1958 Airstream, 1959 Glasspar 16' Avalon, Cabin in the Woods........what will I work on next
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Old 08-24-2009, 03:06 AM   #3
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I do have the Cat Books it talks about testing at 7-10 lbs. That just seemed low to me however, it runs 165` therostats so that may be correct.

Thanks foe your input...

Jimmy
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Old 08-24-2009, 02:06 PM   #4
prairieschooner
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Sounds like the Cap should be in that range.
good luck
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Steve & Tricia
1982 Newell 38' (built before #1) 6V92 DD, 5 Speed Allison, 12.5 KW Kohler, Couch used to make into a Bed but I fixed it!
https://newellshowcase.com/thumbnails.php?album=214
2007 Yukon, 1981 CJ7 Laredo, 2002 Honda CRV, 1955 Thunderbird, 1952 Pontiac Sedan Delivery, 1952 Ford 8N, 1958 Airstream, 1959 Glasspar 16' Avalon, Cabin in the Woods........what will I work on next
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Old 07-09-2010, 04:42 PM   #5
jwe648
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Luck is with me. I found the cap for my radiator on the 74' . The pressure valve is on the tank... not the cap.

Fits Necks with an Outer Dimension of 2.59"





Radiator Cap Shell ( Lebow-Eaton) NUMBER CC-914 O.D.2.90" I.D.2.75" VENTED No GASKET Neoprene FINISH Zinc Plate STAMPING Water
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Old 07-09-2010, 08:49 PM   #6
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time to take a trip up the hills again to see what it does to your temps...

tom
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Old 07-10-2010, 02:19 AM   #7
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Default This time

I agree Tom...with our milder 112` temps this weekend I'll try it with the tow/dolly & car also...


Quote:
Originally Posted by encantotom View Post
time to take a trip up the hills again to see what it does to your temps...

tom
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Old 07-19-2010, 12:39 AM   #8
jwe648
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Default Took that Trip back up the Mountian

Per Tom's instructions I have challanged the Mountian again... With a new radiator cap and some "Water Wetter" along with our milder temps 112` went up to Sedona.. Mid-day this time with full everything & car intow..

Results as follows. All temps normal.. and everything worked..so...
We ready for the road.. One year to date from the start of the rebuild.
"Ready for the Road"..

Thanks for your support to the Newell Family!

Jimmy
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