Info needed: 1967 M38A1 Lubrication?

[Les Kovacs]

Hi Rob.....thanks for the quick response....wow what a learning experience!

OK....so here is what happened after an actual 25 min drive at about +27 C and moderate humidity....the temp gauge slowly went to about 185 degrees (temp lingered at around 165 for longest time)and stayed there through the whole drive....after garaging the jeep....I checked the upper rad hose...no pressure so I opened up the rad cap and put in a temp gauge....rad coolant read +155 F....Question....is +185 F normal for average summer drive and why was the actual coolant at +155 F?.....also, why did the new thermostat not open?.....is temp gauge reading dubious?

PS...Temp gauge does not fog up any more since putting in a thermostat.

PS...rad cap is dubious as it is old and I had to put in a rubber gasket that was made out of bike tire inner tube. I have no clue what the PSI rating is!

I am ordering two new rad caps....Kaiser Willys shows that a 7 lb cap is required for the M38A1 but the 1967 CDN military manual states that a 4 lb cap is required.

What's the correct rad cap for this jeep?

Thanks.....les