oil type and radiator question

What weight of oil is recommended for a 4 cyl. jeep? What type?

Also i have a radiator problem After driving my jeep around i noticed i was low in the radiator so i added some fluids to it, only to find out i was low again after a few days. I pulled my jeep over after refilling the radiator and the overflow was shooting water out. My guess is a hose must be blocked, any suggestions?

 

Someone might correct me but 10w-30 or 10w-40 with an SF rating would be ok. As for your coolant question.....I had the same problem with my :v6:. I traced it down to the previous owner had a 7lb cap on instead of a 15lb one. Once I did this it was better. But I should clarify myself I have a little room due to not having a overflow tank. I didn't mean to mislead anyone. I think you also need a 15lb cap, but I don't remember. How is it? are there cracks on the gasket? how old is it? A cap is a cheap test. I suppose a hose could be restricting the flow but I would think you would overheat. How hot are you running? Hope this helps a little.

 

Unless you have a coolant overflow tank, the radiator needs a little air space in the top tank. If you fill the radiator right up to the top of the filler neck, some water will be vented. This usually happens when you shut down, because there's no more cooling air, and the residual heat in the engine makes the coolant temperature rise, even if the engine is not running.

 

1. I use Rotella, 30w in summer, 15w-40 in winter.
2. As Timgr said: The radiator needs a good couple of inches at the top for coolant to expand after the engine is shut off. (I would also try a new cap, I have a 7lb I think on mine, and the stock listing for the 134 is something ridiculously low if I remember correctly). Also make sure you have a temp gauge. (head gaskets aren't difficult to do on these, but its not fun at any rate). If your not overheating and its only venting a little bit out, then you are most likely fine.

 

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If I take the cap off I can't see any fluids

 

You should be able to see the coolant with just the cap off. It should just cover the little inlet nozzle that the upper hose attaches to. So next thing in line I think would be a temp gauge, ( around $15 for the sunpro mechanical gauge at most flaps), Then, if its overheating, that will be the route to explore.
Just install the temp gauge, ( I had mine just sitting on the passenger seat for a while until I mounted it.) Fill the radiator to about 2" from full, and drive it for a while....make sure its good and hot, then shut it off and see what happens. (its normal for the temperature to rise above 200* right after you shut it off).
If it is overheating check:
1. Thermostat....make sure there is one, (mine didn't have one when I got it), also make sure that there is a small hole drilled in it so that air bubbles can escape the cooling system. (also make sure it works before you install it, I have heard of many a thermostat being bad right out of the box)
2. After the thermostat, make sure that when its filled you run it up to temp with the cap off and let all the bubbles escape, then you should be able to see the coolant churning when the thermostat opens.
3. If all of this is right and you are still overheating/loosing coolant, check the head gasket. Look for bubbles in the radiator while running, black colored coolant, milkshake looking oil, or low/no compression.
Hope this helps,

 

1) My engine is overheating (around 230')
2) Replaced my thermostat, that's not the problem
3) I'm planning on ordering a water pump
.... Any other ideas? (I have the 7lbs cap)

 

how strong is the coolant? ( i run 60/40 coolant/water )
do you have a winch or several large lights blocking the rad?

 

A couple other things outside of making sure the cooling system is bled, and the thermostat/water pump are working, (if you can see the coolant circulating through the opening in the radiator after operating temp is achieved, your water pump is most likely fine....)
1. Make sure that its not running too lean
2. Make sure you have correct timing as well
While these are far less likely to cause it to run THAT hot, they could be possible sources of excessive heat.
If your thermostat, water pump, and radiator are working properly, (clogged radiator?), and there are no major obstructions, no air in the cooling system, and the fan spins, then you should have no reason for it to overheat.
Good luck.

 

I Checked my radiator cap, It's 7 lbs and it still has some spring in it. I checked my FSM and it says to use a 7 lbs cap. Went to NAPA and asked them to get me a new cap and in their book it says to use a 13 lbs cap. I'll try out, but right now my jeep is at a car shop.