CM 871 oil Thermostat temp

[Rawze]

First of all, your problems are obvious!...


The truck is geared WAAY TOO TALL for 135k+ weights. It should have minimum 4.11's .. but more like 4.36's in it for those kinds of weights. This especially so in hilly and mountainous terrain.

NEXT: the engine is a mid-tier. NOTHING IN THAT ENGINE was designed for heavy haul.

The engine was not spec'd for doing what you are trying to do with it .. +++ you are torturing it even more with too tall rear ends~!.

ARE THESE AERO TRUCKS?.. or actual heavy-haul trucks with a large front ends made for the extra cooling needed?.

and then you say its oil system is overheating.. well.. look in the mirror. - you have the wrong equipment for the job!.


A proper tier-1 engine made for heavy haul had a proper DUAL ELEMENT COOLER IN IT. It has a heavy-haul titanium higher-flow turbo on it to help push the heat away. It has a different head and lower compression pistons to lower combustion heat buildup. It has higher-flo injectors in it to prevent injector tip overheating.

I.E.> ITS MADE FOR HEAVY HAUL.. and a mid-tier is NOT!.

If the oil is getting above 240+F so easily, .. assuming any de-mandate programming is NOT causing it for a moment, ... then you are torturing the engine beyond what it was designed for and pushing it too hard. The excessive oil temps are a reflection of this and are your only indicator.

What is the EGT's getting to when the oil temps are getting this high?.

I have seen people haul a lot more heavy stuffs than you describe and not have those kinds of issues unless something was amiss somewhere, or the engine/truck was not built for what your trying to do with it.

That is why you should not put a lower thermostat in it.. it masks all these facts and does nothing whatsoever to help engine longevity compared to simply not torturing a mid-tier CPL2732 to death!.

You also talk about turning up the HP in them... This would NOT be advised on something being tortured. Not unless you just want to tear them up.. especially if the truck has a hired driver in it.... as they tend to not go9ve a s$it but push the fuel pedal all the way to the floor on every single damn hill without any regard to anything.


============

and no.. the flaked out cam was not a result of high oil temps!.

Take your pick...

.. it is a result of either engine abuse (lack of regular overhead valve and other adjustments) ...

... perhaps synthetic oil being used + and/or not changing the oil based on fuel mileage (or often enough vs. its operating loads).

... or crank case pressures building up due to lack of proper crank case ventilation, and it starving the top end of oil.

.. perhaps a combination of the above.

With 135k+ weights .. your fuel mileage is likely in the low 5's.. meaning the oil should be changed at about every 8,000 - 10,000 miles roughly at that point.
ref: http://rawze.com/forums/showthread.php?t...9#pid76569

AND WHEN YOU FOUND THE VALVE CAM FAILING... YOU SHOULD HAVE SHUT TI DOWN RIGHT THEN AND FIXED IT INSTEAD OF HAULING MORE FREIGHT WITH METAL SHAVINGS RUNNING AROUND IN YOUR OIL!.