Info needed: 1967 M38A1 Lubrication?

[Les Kovacs]

Hi Rob....no, I have not tried a mechanical gauge as I do not know how and I have never seen a mechanical gauge that replaces a proper sending unit.

As previously mentioned, several times right after shut off I cracked the rad cap and quickly put in a temp gauge meant for fluid immersion and the temp is always at 155-160F.

Where can I get a mechanical gauge and where does it plug in?

Also, why would the average coolant temp rise from 130-140 F to 180-185 F after having the rad flushed, a thermostat installed and a new water pump?

les

[rob love]

http://www.ebay.com/itm/NEW-SuperPro...UAAOSwZQRYbUaW

Temp went up because you installed a thermostat. What we need to do now is determine if you have the same readout between your thermometer and your gauge. Then again, one has to ask why? You are not having any problems now...perhaps quit chasing the red herring and enjoy the Jeep.

[Les Kovacs]

Hi Rob....thanks for the quick response...your right.....I should be enjoying the jeep which I am....almost every warm/dry day my wife and I go out for a 10-20 km drive....the jeeps driveability is a little better after I adjusted the carb mixture-smoother after 1/8 turn counter-clockwise (leaner) as you had explained.
However, as I want this jeep to live a long life with the engine it has I need to know the true engine temp (if the gauge/sending unit is bad it could be reading temps past 200 F and I will never know) as well as the true oil pressure (pressure gauge now reads 50 psi after start and after about 10 min of driving but then after a few more min reads 20-30 psi when driving)....so I am somewhat anal when it comes to true engine operating parameters.

Another question...I shift by sound and jeep vibration....I usually shift to 3rd at around 25 MPH (if gauge is somewhat accurate) but get a mild shudder until about 35 MPH....is shifting to 3rd at 25 MPH lugging the engine?....when are your shifts?

Many thanks,

les

[Les Kovacs]

Hi Rob....as per one of your earlier posts/reply's to my questions you had mentioned that a 13/16 deep socket was required to un-screw the spark plugs...I purchased a 13/16 deep socket at Princess Auto....the socket was the deepest at 3.0 inches overall length....it does not fit....it appears that a socket to fit the depth of the plugs would required an additional 1/4 inches of length. Any idea where to buy a longer(3.25 inch long) 13/16 deep socket?.....I really do not want to spend $40.00/US to order a special plug socket wrench if I do not have to.

Thanks for all the other great ideas and tips.

les

[rob love]

Both proto and gray brand 1/2" drive deep length sockets will do the trick. There will no doubt be others. Forget about spark plug sockets, they are too short internally.

I just went to the tool box to try some others out, and my 1/2 dr princess auto socket only barely makes it onto the hex, so I won't reccoment that socket. However I tried a westward 3/8 drive 13/16 socket and it fit well. Part number is DS386K.

Best bet is to take a spark plug to the tool store with you and try some out. Plugs are not in that tight, so you don't need top quality.

[Les Kovacs]

Thanks for your response....I will try NAPA and if all else fails I will scour Barrie's auto shops for a longer 13/16 socket....many thanks!

PS...Jeeps goes into shop tomorrow for rear pinion seal and add a leaf to the driver side rear spring pack....which leads me to my next question....even without the add leaf to the passenger side (carried 200 lbs of radios) the angle of the "U" joint and shaft coming out of the transfer case seems somewhat drastic....how much angularity can the joint handle?...(jeep already comes with standard 12 leaves per rear pack).

Also, I ran across a few posts of some people drilling a 1/8 inch hole in the skirt of their thermostat....why?

Regards,

les

[rob love]

Originally Posted by Les Kovacs

Thanks for your response....I will try NAPA and if all else fails I will scour Barrie's auto shops for a longer 13/16 socket....many thanks!

PS...Jeeps goes into shop tomorrow for rear pinion seal and add a leaf to the driver side rear spring pack....which leads me to my next question....even without the add leaf to the passenger side (carried 200 lbs of radios) the angle of the "U" joint and shaft coming out of the transfer case seems somewhat drastic....how much angularity can the joint handle?...(jeep already comes with standard 12 leaves per rear pack).

Also, I ran across a few posts of some people drilling a 1/8 inch hole in the skirt of their thermostat....why?
Regards,

les

The angle of the drivetrain is just fine. I have never dealt with any significant damage to U joints or rear driveshafts on the M38A1s.

The hole is likely peoples attempt to make a bypass so there is flow, preventing hotspots within the engine. Really not neccessary, since all the military Jeeps have the bypass hose running from the head to the water pump. We didn't do that in the military....really no reason for it.