Hello everybody,
I have a ram 1500 2011 quad cab 4.7L flexfuel. I imported it from the United States when it had 165000 Miles in 2019 now it has 187000 M. I've always had this problem with the oil light coming on when the idle drops to 500 rpm and engine warm.Here in France I use E85 and not gasoline because it's too expensive and "It's better for earth". I replaced the pressure sensor, oil pump and pan there and that didn't change anything. I looked up the internet and saw that I could try using 20w50 instead of 5w20. I had already used 10w40 at the last oil change.That didn't change anything, but I did an oil pressure test. Here is what I found.

With 10w40:

Temp 96°C 500rpm 5 PSI
Temp 96°C 600rpm 10 PSI
Temp 96°C 900rpm 12 PSI
Temp 96°C 3000RPM 57 PSI

With 20w50:

Temp 96°C 500 RPM 7 PSI
Temp 96°C 600 RPM 9 PSI / 11PSI cold
Temp 96°C 900 RPM 18 PSI
Temp 96°C 3000 RPM 52 PSI
Temp 96°C 4000 RPM 58 PSI

What do you think of my results? Do you think I should be worried about the crankshaft bearings?
It doesn't make a clicking noise.
Could it be that some new sensor does not open at the right pressure?


Thanks, Chris.

 

Unless it was mistreated, it really should have better pressure than that, at your mileage. I know yer gonna hate this suggestion... but, might wanna drop the pan, and use some plasti-gauge on the rods and mains. Visual inspection might tell you everything you don't wanna know.

 

Thanks for the suggestion, but I have already changed the pan for a new one. Since it's a 4x4, I struggled to remove it. otherwise I would have already reassembled it to visualize something. But it is still necessary to know about it to know what to check. I have some knowledge of mechanics but not automotive. I know how to do what I am asked to do but alone, it is not obvious. I have already made the head gaskets of a Porsche Cayenne V8 340 HP. but I documented myself before. What would be the procedure to check the axes by the pan?

 

If you have dropped the pan once already, process is the same. Once it's out of the way, unbolt one of the rod or main caps (one at a time please, and keep in mind it has to go back in to the same place it was removed from, in the same orientation.) throw a bit of plasti-gauge in there, torque it down, pull the cap again, then measure how much the stuff has flattened out to get your bearing clearances. If they are out of spec, change the bearings.

 

Ok, thank you HeyYou.
I'll order palastic-gauge and remove the pan. I'll be back when I'll be ready to work on.I never use plasti-gauge.

 

It IS pretty 'old school'.

 

What caliber of plasti gauge I need ?

 

Need to know what bearing clearances are supposed to be, then get the plasti-gauge for the tolerance range. Specs should be out there somewhere, or, get yourself a service manual for the truck. (best idea....) you can usually find them in pdf format, for 30 or 40 bucks.

 

2002 4.7l and 2011 are the same ? I found a PDF on the web I can share it on this post ?

 

I don't know.....

2002 is third gen, 2011 is fourth... there may be differences there.... Here are some for 12 bucks.... Not sure how reliable the site is, I am sure there are other sources.