Hello, I'm new to the forum here. Been a diesel tech for about 14 years now. Looking for some info on a small cam. I.d tag us gone. If like to know exactly what I'm working on. Is there any place on the block where they would stamp the e.s.n on this poor thing??? Unit has a few issues. Came in for coolant psi building in the radiator. Ran at a higher idle and using a temp gun for 3 and 6 holes dead. Is there a adapter to do a leak down test that I would install where the injector sits in the head??? I have one for a big cam 855 but it looks different from the injector in the small cam. Any info would be much appreciated. Thank you for your time.
big cam small cam inj. holes are same size
Sweet thanks for the info. Is there a place where they stamp the block with the engine number?.
For starters what is this SC in? One big problem with these old engines is that a high percentage have been fFrankin Fruitered. Every knot head has had there fingers on it. Hell that engine could have set in three different sets of frame rails in it's life. And the ESN # only pertains to block. Back left corner at top of block.
1975 peterbilt
On the top/front of PT injection pump there should be a tag there with a CPL number or injection pump code and some have something like NTC 350 stamped on it. If it's a code a injection pump shop can look it up and tell you the engine that pump is calibrated for. If your lucky it will have a 3 digit CPL number, Now keep in mind Cummins didn't start CPL numbers until 1972. CPL-controlled parts list. Valve lash intake .011 Exhaust .023 injector setting 72 lb inch. Set all on same hole at same time FO-153624. But one thing to keep in mind is the cam any good? Are the push tubes straight and not full of oil?
That's great info to have. Thank you very much. Not very many people know much about these engine's anymore. The old school log truck drivers around here are the only ones really. But they like to Jerry rig things to get there load. I will be putting this in my file. Will let you know my finding. Thanks again
Agree with what others have said. Just have to wonder where this engine has been for the last 45 years and who has done what to it to try to keep it running! Even if you can get numbers off the pump and back trace them to a CPL number all that will tell you the information for the engine the pump was used on. My first guess is pressure in radiator would have me thinking cracked head or bad head gasket. For the lack of test equipment you could try swapping injectors between good cylinders and dead cylinders. If problem moves then injectors are the problem if it stays the same then it's something deeper. Might be worth looking around for a good used engine. But that to is a gamble.
Have had old Cummins building coolant pressure, pull injectors to do pressure checks where had multiple cylinders load with coolant from loose cups. No further need to check pressure leaks. Have seen all manner of crappy Cummins Reman heads from all manner of rebuilders. TS is correct as to looking at every push rod, lightly drop them one at a time a short distance to the floor on a end, goes thud is full of oil and junk. Small cams were notorious for flaking injector lobes and lower rocker rollers, can only see from the Bottom Side.
Usually when coppers go bad it will push fuel into radiator and when with pressure on cooling system engine off coolant into fuel. Had a Freightliner COE come in years back, fuel was pushing past the rad cap.
I would also suspect sunken liners or bad lower liner bores on something that old. You might pull the pan, put some pressure in the cooling system and look for rain underneath. This is sounding like a black hole to poor money into.
It will never end unless out of framed, too many cooks in the kitchen over the years, fix one item then it's another.
And you better have at the least a skid steer to push that money into the hole, a wheelbarrow will not be worth the effort. I say this and those old 855's were one of my favorites back in the day, well not for in-frame work!
They are all correct! However I would hate to see you put in a long block and find you have a bad air compressor or air controlled heater valve.
The problem with these types of problems is the whole engine can be one big problem. I would be willing to bet it has extremely used cam bushings.
1 more. liner cavitation .
I`ll throw this out to` I have the tool to pull the rear most cam bearing out of sm. cam when doing an in frame