New to site and Motorhomes. Looking at buying a used 39 ft coach. The dealer says it's a 24 valve 8. I have heard of a 24 valve 5. I'm thinking because it's an older engine that an internet search did not produce anything specific. If anyone has any specific information torque specs, reliability, fuel mileage, know problems, etc it would be greatly appreciated. Thanks for the prompt reply, that's good to know and that the salesman had it right, I've talked to many sales people that didn't know a Cummins from a Cat.

cummins isc torque specs

Makes me more comfortable dealing with him. I'm thinking the 24 valve should be a stronger and more efficient engine than the 12 valve version of the 8. I also have this engine in a model American Eagle and it has been a fine operating machine. I have though adjusted the valve lash after 36, miles and that made a big difference in the overall noise level from the upper end.

I found they were out of adjustment in excess of 4 to 5 thousandth on most of the intake and exhaust valves. More valves are there to help the engine builders conform to increasingly onerous EPA regulations. That may be in part why a legendary manufacturer Caterpillar chose to leave that part of their business.

cummins isc torque specs

The more parts added to an engine valve train increases the complexity and possible failure. I don't think adding more moving parts to an engine helps it to be more robust. Just a guess on my part. And, I would suggest that better breathing, whether gas or diesel is better for BOTH power and emissions. That might be there recommended point, but I decided to have my valves adjusted at around 70, miles and it made a very noticeable difference.

I agree with Rich. My engine was getting noisy at the top end at idle and after adjusting the valves the noise is gone and it seems have improved the overall performance. The hardest thing to do whole performing this task was not being able to access the plug to rotate the crankshaft.

Rocker Arm Assembly Bolt Tightening Sequence and Torque Specs

I had to remove the starter and rotate the flywheel with a pry bar to open the proper valve sequence during the procedure. To do again I would probably have had it done by a good shop. Yes your correct, the 8. But the 8. What I like about this particular coach is that it aand is free of all the emissions add-on that contribute to the complexity of the engine management system.

Having life long friend that's a certified Cummins mechanic, he knows first hand that the valve lash can make a big difference in how a Cummins performs, even when done earlier than recommended by Cummins. In fact at his shop, they adjust the valves a little different than what's recommended, which also adds a little to the performance characteristics. But is it more robust? Will it live as long as the N Cummins or the Detroit Series 60?

The more things that go up and down depending on an oil pump? The reality is that virtually all diesel engines used in RV's in the last couple of decades will far outlast the rest of the coach.

Well said Brett! I have seen many diesels killed, not worn out, some by design defects, most from lack of proper maintenance or someone tinkering with HP and torque. Trying to find the ambitionSinceCummins Incorporated has built powerful diesel engines for commercial and consumer vehicles. In its early life, the company provided large-displacement motors for heavy farm and construction equipment.

As the company grew and the demand for more diesel engines came into consumer culture, Cummins started providing powerhouses for automobile giants, such as Chrysler. If you wish to perform engine maintenance or tune-ups on your Cummins diesel, it is important that the parts be installed to factory-specific settings. All of the nuts, screws, bolts and parts need to be torqued to specific amounts, or else leaking or cracking could occur in vital areas.

The air intake of Cummins diesel engines are just as imperative, if not more, than the intake systems on regular gasoline vehicles. Temperatures of the engine can reach extreme heights, as many of these engines rely on turbocharged fuel and air induction. The air intake housing unit is held together by a series of bolts.

In the 5. The intake manifold bolts of this particular engine should be torqued to 35 foot-pounds for accuracy. The sensor attached to this intake manifold is held together by bolts that should be torqued to 10 foot-pounds. While the cylinder head might not be a common part that needs to be removed, there might come a time in which you will need to replace the head gaskets of your Cummins diesel engine.

When reinstalling the cylinder head bolts, torque the 5. Over-torquing these engines can lead to cracking, while under-torquing these cylinder head bolts can cause the cylinder bolts to loosen during operation. Responsible for lubricating the motor, regularly servicing the oil and its respective parts is vital in engine care.

When removing and replacing the 5. The oil pump bolts should be torqued to 35 foot-pounds, while the oil pump cover that attaches to this needs to be torqued to 7.

The camshaft in most modern Cummins diesel engines is located over the cylinder ports, pushing the valves up and down. If cleaned or replaced, the camshaft and its attached hardware should be reinstalled properly to avoid misfire and erratic engine behavior.

The camshaft position sensor bolts should be torqued to 15 foot-pounds in the 5. The timing chain and belt sprocket combination that attaches to the camshaft should be secured with bolts, torqued to 35 foot-pounds. When replacing the timing chain and belt sprocket cover, torque the necessary bolts to 30 foot-pounds. Just like the oil pump and corresponding parts, the 5.

The fuel pump itself is held together by a series of small bolts, each of which should be torqued to 18 foot-pounds at first, then followed by a final torquing of 32 foot-pounds of pressure.

The fuel filter brackets hold the fuel filter canister into place with two bolts, which should both be torqued to 18 foot-pounds. The fuel filter canister is also held into place by a single locking nut, which should be torqued to 10 foot-pounds. The nuts that hold the fuel tank into place, located at the rear of your vehicle, need to be torqued to 30 foot-pounds each. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Torque Specifications for a Cummins by Matt Wooddy. Oil Pan and Pump Responsible for lubricating the motor, regularly servicing the oil and its respective parts is vital in engine care. Camshaft The camshaft in most modern Cummins diesel engines is located over the cylinder ports, pushing the valves up and down. Fuel System Just like the oil pump and corresponding parts, the 5.Cummins engines are used for large trucks and for diesel fuel vehicles.

Since the s, Cummins has released several models of the engine. Although each engine usually is a 6-cylinder engine and can hold 14 liters of fuel, the engines differ in torque power. The main engines have a year range from tototoand the current Cummins engine, which was released in Torque is a major measurement in the power of engines since it reveals the amount of force the engine can utilize to move a vehicle.

Torque is defined by the force that causes an object to rotate. All measurements for torque are in feet per pound. Both the to and the to Cummins engine had a rod torque range of 75 to feet per pound. The to and the to current models fair slightly better with a rod torque range of 75 to feet per pound. The cylinder head bolt torque of all Cummins engine models have remained consistent.

cummins isc torque specs

The range of the torque is to feet per pound. It is noted that the torque moves in a 90 degree direction. The main torque of the to Cummins engine requires a one inch bolt and can carry a load of to feet per pound. If you utilize the one inch bolt, the torque specifications range can be to feet per pound.

Both the to and the to present Cummins engines have a main torque specification of 90 to feet per pound. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Cylinder Head Bolt Torque The cylinder head bolt torque of all Cummins engine models have remained consistent.

Main Torque The main torque of the to Cummins engine requires a one inch bolt and can carry a load of to feet per pound. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

Photo Credits truck image by Byron Moore from Fotolia.Cummins is an American company that has been manufacturing diesel engines since the early 20th century. BeforeCummins engines were probably best known for powering medium- and heavy-duty trucks, but in that year, Dodge began installing them in its three-quarter ton trucks.

Although General Motors had been using diesel engines in its light trucks for more than a decade, those power plants did not compare to the heavier-duty Cummins engine. The injection pump gear nut bolts require ft. The banjo fittings on top of the fuel and water separator, and on the fuel supply and return lines should be tightened to 18 ft.

The "T" fitting on the fuel drain manifold needs to be tightened to inch-pounds. The fuel filter canister bolts require 18 ft. The fuel filter canister mounting nut needs to be tightened to 10 ft. The fuel filter drain valve mounting screws need only 30 to 40 inch-pounds of torque. The fuel tank mounting nuts need to be tightened to 30 ft. The injection pump mounting bolts need to be tightened to 32 ft.

The fuel line fittings at the fuel injectors should be tightened to 30 ft. The fuel transfer pump mounting bolts require 9 ft.

The camshaft sensor bolt needs to be tightened to 15 ft. The engine coolant temperature sensor retaining bolt should be torqued to 10 ft. The accelerator position sensor bolts require only inch-pounds of torque.

The manifold air pressure sensor bolts get tightened to 10 ft. The water-in-fuel sensor bolts should be tightened to 15 to 20 inch-pounds. The retaining bolts for the engine lift hooks require 57 ft. The engine control module ECM bolts should be tightened to 18 ft.

The air intake housing bolts need to be tightened to 18 ft.

Cummins Engine Specifications

The intake manifold air heater relay bolts should be tightened to 40 inch-pounds. The power control module PCM mounting bolts require 35 inch-pounds of torque. Miscellaneous Components The retaining bolts for the engine lift hooks require 57 ft. References Dodge Ram: 5.Competition Diesel. Anyone got a torque spec for the oil cooler on a ISB? Apply kPa 70 psi air pressure to the element to check for leaks.

If the element leaks, replace the element. They are 10mm head bolts LOL Any help out there? Hopefully I'll put this thing back on in a couple hours after I get the kids, drive home, and pressure test this one. I just got my new gaskets in. I never use a torque wrench on them, I would have guessed ft-lb. Anymore, I barely have time to do things once. There are passages all over the place and I figure getting them all to the same torque would be critical. The molded in orings aren't very thick and don't look to be too forgiving!

I think the use of a universal adapter to get a socket on half of them is going to throw the torque reading out the effin door I used an inch when I do the little ones. I got it on. Pretty easy except for the amature contorsionist act.

I stared with the torque wrench The only way to use one is to have the block out of the truck. You can properly torque about 4 of the The "XT" in its name refers to the extra displacement 6.

The ISB family also includes and horsepower ratings for motorhome applications along with the ISB AD models which are used in front engine diesel chassis. ISC Built on a reputation of delivering additional performance when a little extra is needed. With up to horsepower and lb ft of torque, the ISC is designed to provide the performance to deal with heavier loads and steeper grades.

Cummins C Series engine

ISL The ideal engine for larger luxury motorhomes. With power up to hp and lb-ft of torque, the ISL can accelerate at any speed and quickly climb the steepest grades even when towing. The ISL offers a very strong engine brake for extra braking capacity and added driver control.

With 20, mile 32, km oil change intervals, the ISL saves money and time when it comes to maintenance. With the highest power-to-weight ratio in its class, the ISM and horsepower ratings let you climb every mountain. Engine Weight Dry 3, lb 1, kg. ISM Designed for long-distance cruising up and down the interstate.

ISX Dual overhead cams, an integrated engine brake, and horsepower from the most fuel efficient engine in its class.The Cummins ISC is a straight-six diesel engine with a displacement of 8. Cummins began producing the engines in The engine was based on its predecessor, the Cummins C 8. The first electronic version, known as the C8.

By lateCummins announced that they will revise the engine to sport a High-Pressure Common-Rail HPCR system to help with emissions and also a variable geometry turbocharger system to help with the performance on this engine. A few thousand units of this engine are now roaming in the world operating on a variety of applications.

From Wikipedia, the free encyclopedia. This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Clessie Cummins. Joseph Irwin Miller Tim Solso. Tom Linebarger. Categories : Cummins diesel engines Diesel engines by model Inline-six engines. Hidden categories: Pages with citations lacking titles Pages with citations having bare URLs Articles lacking sources from November All articles lacking sources.

Namespaces Article Talk. Views Read Edit View history. Languages Add links. By using this site, you agree to the Terms of Use and Privacy Policy. Straight-six diesel engine. Founders Clessie Cummins.