This is why I stay away from here, I won't argue it's a waste of time, you are right there is no such thing as a 444 1211 you caught me in a lie....
400 big cam advice.
Discussion in 'Trucks [ Eighteen Wheelers ]' started by MrPlow93, Nov 13, 2015.
Page 4 of 5
-
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
The generator drive engines I mentioned have high flow injectors comparable to what was used in the NTC-475 truck engine, these are timed around .120" or a little less, the MVT was timed at .125" in retard, but the generator engines run at a constant 1800rpm.
While looking at these timing numbers one should note that there are three different injector travels for the 855 Big cam, .224", .242", and .266" so timing may be adjusted to be proportionate to overall travel.
The ones that really throw me off are the mechanical N14s which really are just and even more updated big cam, these engines have the same injector travel but timing is quite retarded, the N14-430 is timed at .176", I would say some of this may have to do with air to air, as cat also took their timing the same way when switching to air to air. Cummins may have also set the timing this way to allow lower rpm heavy fueling to try and lower the powerband.
Retarded timing does not make more power, what it does is allow you to make power at a lower rpm which is where the burnt up pistons come from.
I do not hear much about the older engines, I know piston compression options were not much with the earlier engine, now though there are plenty to choose from and lower compression with the retarded timing may help longevity of head gaskets by trying to keep cylinder pressures in check.
I am not sure what your question is in regards to the fuel pressure?BoxCarKidd Thanks this. -
-
Attached Files:
Intothesunset Thanks this. -
-
N14 parts are common and that makes it easier to find parts that take less adaptation than a 5” inlet would. -
Attached Files:
Stray_Dog and Intothesunset Thank this. -
-
So..since the last post was in 19 im going to presume its alright to high jack? If not I'll start another.
Just bought a train with a cummins. Cpl676 so that appears to be a bc3 nt855 according to quick serve. My motor appears to be weeping oil from the head gaskets as well. My mech wants to change the head gaskets. According to this thread it should be left alone, is that the consensus?
She drove from Minnesota to texas just fine. She smokes like a train on start up and a little haze after shes warm. -
If it has a lot of blow by gaskets would probably only be a temperary repair. Make sure you do not have any leaks coming down from higher up. Rocker shaft o-rings and such. Blocks of that age tend to have a lot of fretting. Sometimes they need to be decked. If it is a slight head gasket leak I would run it.
-
No blow by that i can see. Run it with the oil xap off and it has no blow by at all has a 13 speed trans but its like under drive not over. Technically I'd say its an 8 speed. Truck had a hoist and pto, "special service truck" it only drove little less than a mile a day so its low miles, but has plenty of hours.
-
I reresurrected this thread needing opinions .. 1st off I'am not a Cummins Guru by any means .. but looking at a truck with a BC3...400 its weeping a little coolant from the #2 head gasket..my gut feeling says it needs to have head gaskets .. the owner says that's common .. I read this thread looking for info but the issue in this thread was oil related not coolant.. I know Cummins like to seep some oil but I didn't know if coolant was a issue also ?
And thoughts and opinions are welcome
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
Page 4 of 5