What is the difference between a rebuilt engine and a re-manufactured engine?
A rebuilt engine is one that is has several, but not all, of the major components replaced. Then, all of the exterior parts (alternator, water pump, power steering pump etc) are put back on. This is generally done by folks at your local shops and those of us willing to tackle such problems ourselve. If you bend a valve, the guys at your shop will say they need to “rebuild” your engine. They will probably put new ones on the side of the motor in which it broke and replace the gaskets and such needed to fix . They don’t replace the exterrior parts if they aren’t broken, and only those internally that are out of spec or the root cause of a problem.
A remanufactured engine is a much more reliable and precise process. The entire motor is stripped down to the block, surfaces are re-machined to the correct tolerances, cylinders are honed, sleeves are replaced, heads are re-surfaced, crankshaft, bearings, rods, cams, etc are all replaced with new parts. The external parts are all remanufactured and replaced as well.
Remanufactured is in a new-like condition, only resusing the block and other housing components. Rebuilt means something broke and it was corrected, often reusing 80% + of the original parts.
How is a Rebuilt engine better than a used engine?
Buying a car is one of the toughest decisions in one’s life because it not only costs money but also costs a lot of time and effort to search for a vehicle. This hunt of a car involves a lot of factors to be considered e.g. condition of the car features it will offer, the color of your choice, and definitely the engine size.
Apart from all other features, the engine size of a vehicle determines the future costs to be incurred on daily, monthly or yearly bases e.g. the fuel economy, MOT and repair bills and definitely the tax band which will be paid every year.
Although these are the factors that help the buyer to find his choice of vehicle and they decide on the price of the vehicle. But there is still an important factor involved in the buying process and it is the health and condition of the engine compartment which is the most major part of the vehicle
Benefits of a Rebuilt Engine
Here is a scenario for you. There is a strange “knocking” or pinging coming from the engine, or perhaps your check engine light is flashing, or oil pressure has just suddenly dropped. You have taken it to your mechanic and he has told you that you need to replace the engine. What do you do? Your first reaction may be “how am I going to afford to buy another car?”
Your vehicle engine is comprised of a number of moving parts that are subjected to incredible temperatures and pressures on a daily basis, which, not surprisingly after 100,000 miles or more (hopefully) can show signs of wear and tear even if properly maintained, if your vehicle is not regularly maintained or overheats excessively this timeframe can be significantly shortened.
When faced with major engine repairs you have a few options:
- Trade the vehicle. Your trade-in (current vehicle) value is reduced because of the damaged engine. If trading for a used vehicle with a used engine you could be purchasing one with “unknown and potentially costly” maintenance issues. Also, new vehicles are expensive.
- Patch job. Depending on the type of engine damage, you could consider fixing the specific problem. But, this is usually expensive and there are no guarantees that another engine-related failure won’t occur.
- Used/Junkyard engine. You could swap your engine for a used engine from another vehicle. The downside is that you don’t know the history of the used engine. Although “used/junkyard” engines may be warranted, the labor to replace one with potential problems can escalate the engine repair bill.
- Factory Remanufactured. These engines have been remanufactured/rebuilt at a factory. Many internal engine parts have been replaced with new ones. These engines have been tested and come with a warranty that usually covers installation expenses.
- Custom Remanufactured. Here, your vehicle’s engine is removed and rebuilt. Like the factory version; many internal engine parts get replaced with new ones.
Why a car needs an engine Rebuild?
As it is stated earlier that a car needs an engine to be rebuild when its engine doesn’t produce adequate power to operate at least up to the standard. But the question is how to identify if an engine requires a rebuild.
Engine rebuild is a common repair process that is necessary for a car engine to perform well. There are a number of signs that determine the need for a rebuild but the most common sign are listed below;
- If an engine starts knocking with the passage of time it determines that the engine needs a rebuild. Knocking is an awkward sound coming from the engine during the combustion process.
- Excessive smoke from the tailpipe is also one of the major signs of a bad engine. But in this condition only thick and dark smoke and pure white and smelly smoke tells that it is the time of an engine rebuilt.
- If an engine starts consuming engine oil e.g. a pint after every thousand miles, the engine needs a rebuild.
- Misfiring according to the experts also a sign of bad engine but in this case, ignition system e.g. sparks plugs, ignition coils and spark plug wires might be the culprits.
- Oil sludge on the oil pin determines the bad health of the engine. If oil pin has a sludge layer on it, the engine needs a rebuild.
- Fuel economy is also a major factor that can clearly show the engine health. If the vehicle drinking too much fuel which is not usual, it determines that the engine is in bad condition now and needs a rebuild.
What an engine rebuilding process include?
Engine rebuilding process is a comprehensive maintenance process that includes full engine maintenance. It is an expensive and complete repair package an engine receives but still depends on the rebuilders that how they assess the health of an engine.
The job starts from the splitting the engine components apart and assessing the overall health of the parts e.g. if they require a replacement or not. The replacement process starts from rings and the valves job to reinstate the engine compression in one or more engine chambers. This job was done on the engine block and cylinder head. Sometimes, cylinder honing and piston rod bearing replacement include in the rebuilt process.
The philosophy of an engine rebuild is very simple, it includes repair or replaces whatever needed to be. If something is still able to give some more performance, it leaves the engine as it is, means good parts are not replaced in the engine.
The buyer will pay for what he gets, so if the engine is good, the price will be higher than others, if the engine is weak, the price will be lower. Generally, rebuild process includes engine cleaning, parts assessment, replacement of bad parts and components, to make sure the best performance of the engine.