An engine replacement is more than pulling one engine out and putting another one in.

The replacement engine has to be the right application, the old engine has to be removed, components transferred as necessary, wiring and plumbing reconnected, fluids serviced, and the vehicle properly started and tested afterward. Depending on the vehicle, there can also be programming, relearning, bleeding, adaptation, or other procedures required before the repair is actually finished.

An engine rebuild is a different proposition. Instead of replacing the complete engine, the existing engine is disassembled, inspected, measured, and rebuilt with the necessary internal components replaced or repaired.

Neither should be approached as a simple parts swap.

And before we recommend either one, we want to know why the engine failed in the first place.

If your engine really does need to be replaced, you aren’t necessarily limited to one option. There are several ways to approach an engine replacement, and the right one depends on the vehicle, your budget, and what actually failed.

Used engine

A used engine is an engine removed from another vehicle, usually from a salvage yard or donor vehicle.

This is often the least expensive way to get a vehicle back on the road, especially when the rest of the car is in good condition. The downside is that you’re buying an engine with an unknown history. Mileage, maintenance, storage conditions, and the reason the donor vehicle was scrapped can all matter.

A good used engine can be a great value. A bad one can turn an engine replacement into two engine replacements.

New or remanufactured engine

A new engine is exactly what it sounds like: a new assembly manufactured to the appropriate specifications. These are generally the most expensive option, and availability varies considerably by vehicle.

A remanufactured engine is different. It’s an existing engine that has been disassembled, inspected, machined or refurbished as necessary, and rebuilt with replacement components. A reputable remanufactured engine can provide a much more predictable starting point than an unknown used engine, while usually costing less than a completely new assembly.

Short block

A short block is essentially the lower half of the engine. It typically includes the engine block, crankshaft, pistons, and connecting rods, assembled together.

The cylinder head(s), valvetrain, intake, exhaust, and many external components are not included.

A short block can make sense when the bottom end of your engine is damaged but the cylinder head and other components are still usable. It can also be a good option when you want to reuse the vehicle’s original equipment rather than replace the entire engine.

Long block

A long block is a more complete engine assembly than a short block. It generally includes the block and rotating assembly along with the cylinder head(s) and valvetrain.

However, a long block typically does not include all of the external components needed to drop it into the vehicle. Things like the intake, exhaust components, turbocharger, accessories, wiring, sensors, fuel system components, and other equipment may need to be transferred from your original engine.

This is one of the more common options for a full engine replacement because it gives you a rebuilt or replacement core while allowing the vehicle’s existing components to be reused where appropriate.

So which one should you use?

There’s no universal answer.

If the vehicle is older and you’re trying to keep the repair economical, a good used engine may make the most sense.

If you’re keeping the vehicle long-term and want more predictable results, a remanufactured engine or long block may be worth the additional cost.

If the damage is limited to the bottom end and the rest of the engine is in good condition, a short block may be the better solution.

The important thing is figuring out what failed before choosing the replacement. We’ll help you compare the options based on the vehicle and the actual condition of the components we’re working with, not simply recommend the most expensive engine available.

One of the biggest problems with major engine repairs is that “needs an engine” can become the diagnosis way too quickly.

Low compression could mean worn rings, damaged valves, valve timing problems, or a mechanical failure. An engine that won’t start could have a serious internal failure—or it could have a fuel, ignition, timing, or electrical problem. An overheating engine could have a failed head gasket, warped head, cooling system problem, or internal damage.

That’s why diagnosis comes first.

We’ll test what we can, look at the condition of the engine, and determine whether the failure is actually severe enough to justify rebuilding or replacing it. If there’s a repair that makes more sense than replacing the entire engine, we’ll tell you.

And if the engine really is finished, we’ll tell you that too.

The goal isn’t to sell you the biggest repair possible. It’s to figure out what the vehicle actually needs and make sure the repair is worth doing.

N&H Repair can help with major engine problems including:

• Engine replacement
• Engine removal and installation
• Engine rebuilds
• Used engine installation
• Remanufactured engine installation
• Failed or damaged engines
• Low compression
• Internal engine damage
• Rod knock and bearing failure
• Severe oil consumption
• Timing chain or timing belt failures
• Overheating-related engine damage
• Blown head gaskets
• Cracked or damaged cylinder heads
• Valve damage
• Piston and ring problems
• Oil pressure-related engine failures
• Engines that have seized
• Engines with severe mechanical noise
• No-start conditions requiring mechanical diagnosis
• Engine failure diagnosis

If you’re not sure whether your engine actually needs to be replaced, that’s okay. That’s what the diagnostic process is for.

There’s a reason we make a point of mentioning this.

Mobile mechanics are great for a lot of repairs, but major engine work is a different animal. It takes substantially more equipment, time, planning, and space than a typical mobile repair. As a result, many mobile mechanics simply don’t offer engine replacement or rebuild services.

We’ve had customers tell us they’ve called around and couldn’t find a mobile mechanic willing to take on the job.

That’s exactly why N&H Repair offers it.

We’re not saying every engine replacement can or should be done in a driveway. Some jobs require equipment, facilities, or conditions that simply aren’t practical outside of a shop. We’ll evaluate the vehicle and the location before committing to the work.

But if the job is safe, practical, and appropriate to perform where the vehicle is located, we’re willing to take on major engine repairs that many mobile mechanics won’t.

If your engine doesn’t run, getting the vehicle to a shop is already a problem.

You may need a tow truck just to get the vehicle somewhere that will diagnose it. If you already know the engine needs to be replaced, you may then have to pay to have it transported again—or leave the vehicle sitting at a shop while you’re waiting for the repair.

With a mobile engine replacement, the repair can happen where the vehicle already is.

That can mean your driveway, your home, or another suitable location where the vehicle can be safely worked on.

It doesn’t eliminate the complexity of the job, but it can eliminate an unnecessary part of the headache.

A $5,000 engine replacement doesn’t necessarily make sense on a vehicle that’s worth $3,000. On the other hand, a vehicle with a good body, solid transmission, and otherwise healthy systems may absolutely be worth putting an engine in.

We’ll help you look at the repair in the context of the vehicle as a whole.

Sometimes the right answer is to replace the engine.

Sometimes rebuilding the existing engine makes more sense.

Sometimes there’s another problem that should be diagnosed before you spend money on either.

And sometimes we’ll tell you that putting an engine in the vehicle probably isn’t worth the investment.

We’re mechanics. We want to fix your vehicle, but we also want you to know what you’re getting into before you spend the money.