Repair 7

When the oil pressure starts to drop in a diesel engine, problems set in. First, the oil is not fully spread across the engine, which contributes to further problems. Shaft bearings start to wear as a result, including the camshaft. Piston rings start to wear, leading to excessive oil burning. Overall, a snowball effect takes place, leading to eventual engine destruction. When the oil pressure goes low, all additives claim to "fix" the problem instantly. Correctly fixing the problem, however, involves extensive diagnosis, including analyzing the oil pump closely.

False Claims

Low oil pressure in a diesel engine indicates something is seriously wrong. Trying to use additives to correct low oil pressure is like putting a band aid on a broken leg. Some additive makers have been known to make false claims of correcting engine problems. For example, the Federal Trade Commission in 2001 brought charges against Zmax oil additive for deceptive advertising.

True Causes

The true causes of low oil pressure in a diesel engine are serious. First, check the oil level and type of oil you are using. The oil should be rated for diesel engines, and the proper viscosity must be used. The service department of the dealership that sells your make and model of vehicle can help you choose the right oil. If you are using the right oil, the next step is to suspect a faulty oil pump. Furthermore, Machinery Lubrication Magazine states that diesel fuel dilution causes low pressure at startup. A qualified diesel technician can assist you in diagnosing and correcting the problem.

Simple Cures

If the oil pressure is a little low, try some simple fixes. Using a thicker viscosity of oil might help. For example, suppose the manufacturer calls for using 5W-20 to 20W-30 for the oil weight. If you use 20W-30, this is slightly thicker. You are still staying within the recommended guidelines, but are using oil at the upper range of the recommended thickness scale. If you suspect fuel dilution, drain and change the oil and oil filter. This will get rid of the thinned out oil. You oil pump may be sensitive to changes like this, and perhaps the problem will self correct.

Steps To Take

Try the easy solutions first. If the oil pressure is just starting to go low, you may have to change the oil more often to overcome fuel dilution. Try to start your engine less frequently, as the experts state this leads to fuel dilution, particularly in cold weather. If the simple solutions do not resolve the problem, then professional expertise is needed to diagnose the root cause of the problem. Additives claim to correct problems, but these claims should be looked upon with skepticism.

Rebuilding a Sea-Doo engine is one of those tasks that owners hope to avoid during the time they own the watercraft. However, as is sometimes the case with small engine maintenance and repair, an occasional rebuild may be necessary to keep maintenance costs low and to possibly avoid having to replace the entire Sea-Doo before the end of its life cycle.

Instructions

1

Remove all wires attached to the outer part of the Sea-Doos head. Use white masking tape and a permanent marker to mark each wire as you remove it from its original location. This makes it easier to replace the wires and put them back where they belong when you put the entire engine back together.

Remove the bolts with the appropriate size wrenches or ratchets. Bolt size depends on the Sea-Doo model you own and its engine size.

2

Pry the head open using a flat-head screwdriver. Caully remove the two halves from one another and inspect the interior of each. Examine the inside of each cylinder for signs of corrosion. A corroded cylinder indicates the need for a rebuild.

3

Remove the entire engine from the engine block and get it ready for rebuilding. Your best bet for doing this is to send it off to a machine shop to have the cylinders bored, the surface of the block prepared and the stroker kit balanced.

4

Set the crank and check for clearance. Begin by unbolting and pulling off the brackets on the top of the block so the tank can be set it in place. Ensure the oil gulley plug is in place. It is located in one of the holes near the corner on the top of the engine block, right next to where the oil filter goes. Place the bearings for the main crank in place by sitting them inside the engine shaft. Lubricate each bearing with engine assembly lubricant.

5

Lay the crankshaft in the engine shaft by caully aligning each piece of the crankshaft with the corresponding bearings. Cover the crankshaft with the main bearing caps, which should be bolted into place. Tighten each bolt with a ratchet, but avoid over tightening the bolts.

6

Insert the rods and the piston through the cylinders and connect these to the crankshaft using the connecting bearings. Bolt the rods to the bearings on each rod. Test out each rod and piston assembly to ensure that each has proper clearance to move through the cylinder.

7

Cut the block where needed to ensure proper clearance for the motor. Install both the cam and the cam bearings once you have the necessary clearance. Install the timing gear on the crankshaft, along with the crank bearings and the timing chain.

8

Replace the wires in the original configuration based on your wiring diagram and labels. Replace exterior bolts responsible for holding the engine block in place.

Most car engines are modern versions of the internal combustion engine. The first internal combustion engine was built in the 1800s. Such car engines use four steps to burn fuel and turn it into energy with which to propel a vehicle. In the early 2000s, some cars began to incorporate electronic engines which enabled the vehicles to run on electricity instead of fossil fuels. Since then, various steps have been made to increase the presence of electronic engines in cars. However, internal combustion engines remain the standard type of engine used in most cars.

History

Most car engines are based on the internal combustion engine. Leonardo da Vinci described a rudimentary version of the internal combustion engine in the early 1200s, though the inventor did not actually build a working model. The first working version of the internal combustion engine was built by Italian engineers Eugenio Barsanti and Felice Matteucci in the mid-1800s. However, it wasnt until the 1870s that engineers invented and installed the first gasoline car engine.

Since then, internal combustion engines have been the standard type of engine used in vehicles throughout the world. Alternatives to fossil fuel-based car engines exist and have gained considerable popularity since the early 2000s. The main alternative to internal combustion car engines is the electric engine. The first electric car engine was developed by Porsche in the 1900s. The first modern, mainstream prototype of the electric car engine was developed in the 1970s. Since then, various car manufacturers (such as Toyota and Nissan) have implemented electric car engines in several of their car models.

Significance

Car engines propel modern vehicles, including cars, sports utility vehicles (SUVs) and trucks. Without car engines, modern modes of transportation would cease to exist. Car engines also form the basis of more basic types of locomotive technology, such as lawn and garden appliances (e.g. lawn mowers) and recreational vehicles (e.g. all-terrain vehicles and golf carts). Modern, electric car engines are built on the technology established by the internal combustion engine. Also, larger vehicle engines (such as the type used in airplanes) have all used the basic car engine as a starting point in innovation.

Function

The internal combustion car engine uses four internal steps to burn fuel and create energy with which to propel the vehicle in which it is installed. First, the fuel (e.g. gasoline or diesel) is pumped into the combustion chamber of the car engine. Then, the fuel is compressed and burned. This causes the burning fuel to expand under pressure. This expanding energy is then used to power various parts of the car. The burned remains of the fuel is then pumped out of the car engine through the cars exhaust system.

Electric car engines have the same basic setup. However, the car engine uses electricity from an electric battery cell to power the car rather than burning fuel.

Types

Internal combustion car engines can be classified into various types of engines based on intrinsic differences in the way the engines process the burning fuel. For example, engines can be divided into two-, four- and six-stroke types depending on how many piston pumps the engine can propel. Car engines can also be categorized by how the car engine connects to the cars crankshaft. For example, the free-piston internal combustion engine does not even connect to a crankshaft, nor an external piston.

Considerations

Car engines may be selected by the type of fuel they process. Such fuel options are important considerations for individuals interested in purchasing a new vehicle. While the most common form of fuel used by car engines is gasoline, diesel is a common alternative. When operated, diesel-based car engines are much louder than gasoline engines. However, diesel engines are also more fuel efficient and generally more economical. Modern innovations in car engines have also created engine modifications that let vehicles burn biofuels, hydrogen and ethanol. Such fuel alternatives are generally chosen for environmental reasons due to their comparatively-low pollution output.