Engine Rebuild

2000 911 Porsche Carrera Engine Rebuild

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We rebuilt the entire engine of this 2000 Porsche Carrera.

It was a lot of work, but now this car is ready to fly.

Our engine rebuild included:

  •  new piston rings,
  • crank/big end bearings,
  • new hydraulics for both heads, and
  • new gaskets & seals.

Here are the details, we:

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stripped the engine to its bare components;

put the engine through a high pressure cleansing wash to remove all carbon deposits and debris from previous failures;

checked the cylinder bores for cracks and other signs of wear (some cylinders needed re-sleeving);

checked the pistons and changed the rings;

checked and re-honed the connecting rods;

checked the crankshaft;

replaced the main and big end bearing shells;

replaced the oil pump;.

  • stripped down the cylinder heads and checked for cracks, wear and trueness. They were then pressure tested and face machined;
  • machined the valve seats and checked and replaced __ valve guides;

re-cut replaced or refaced valves (as needed);

Leak-tested the head;

checked camshafts for wear;

checked IMS (intermediate shaft bearing) for any play; and

re-assembled the engine with new gaskets and seals etc.

If you are a Carrera or Boxter lover, come by so we can talk about your future project. This entry was posted in Project, Uncategorized. Bookmark the permalink.

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Emission System Repair


The exhaust system starts right behind the engine. Exhaust manifolds connected to the cylinder heads collect exhaust gases. These gases move through the exhaust system, are analyzed by oxygen sensors, are refined by the catalytic converter, and are muffled by the muffler.

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Operating properly, the emission system makes your car run smoother, cleaner, and quieter.

If any of these emissions components fail, emissions can increase. Beside the emissions system, other defective components, such as spark plugs, plug wires, and filters, can also increase emissions.

It is a complex system, but the auto repair specialists at Bowie Auto Clinic can diagnose and fix the problem.

Your car’s emission system controls emissions, exhaust, and pollutants (including gasoline vapors escaping from the fuel tank). The emission system substantially reduces harmful gases such as carbon monoxide (CO), unburned hydrocarbons (HC), and oxides of nitrogen (NOx). The system uses sensors, computerized engine controls, and the exhaust components and, by law, must be kept in operating condition.

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The first sign of a problem could be your CHECK ENGINE light.

When the CHECK ENGINE light or SERVICE ENGINE SOON light comes on, it is time to have your vehicle checked by a service professional at Bowie Auto Clinic.

And if the CHECK ENGINE light is on when you go have your vehicle emissions tested, it will fail.

Emissions Test

“Emissions” is a generic term used to describe certain harmful gases in the exhaust. Hydrocarbons (HC), Carbon Monoxide (CO), and Oxides of Nitrogen (NOX) are usually measured in an emissions test. The state and federal governments place certain limits on how much of these harmful gases can be emitted. Carbon Dioxide (CO2) is also measured, but is not considered a harmful gas.

When the measured gases from the vehicle exceed the state or federal limits, the vehicle fails the emissions test. Whether they use the Online Diagnostic plug-in or the tailpipe check, when you fail, they will be able to provide you with the fail codes.

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To pass a plug-in OBDII emissions test, a vehicle must:

Have a functional Check Engine Light and diagnostic connector (no tampering allowed)

The Check Engine Light must be off

Successfully complete the OBDII system monitors that are built-in to the vehicle

Some factors affecting the emission system include:

Driving and atmospheric conditions


Vehicle age

Type of spark plug electrode material

Poor vehicle maintenance

Poor quality fuel

Damaged or worn sensors

Dry-rotted or cracked vacuum hoses


Diagnosis of high emissions can be an involved process that usually requires special tools and measuring equipment. Here are some of the possible problems:

Worn distributor cap and/or rotor

Improper ignition timing, usually over advanced

Vacuum leaks

Engine mechanical failure, low compression, worn valves, excessive oil consumption

NOX Failure is the result of combustion temperatures that are too high. The most common causes are:

Inoperative Exhaust Gas Recirculation System (EGR)

Cooling system malfunction, engine running too hot (restricted radiator, defective thermostat, etc.)

Over advanced ignition timing

Excessively lean air fuel mixture (defective oxygen sensor, MAP sensor or Air Mass Sensor)

Let the service professionals at Bowie Auto Clinic take care of all your emissions problems. We have the service professionals and state-of-the-art equipment needed to get the job done right.

Heating and Cooling Services

What we do

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Let the service professionals at Bowie Auto Clinic handle your automobile heating and air conditioning problems and routine maintenance.

Heating and Air Conditioning Service

Your car’s engine is the power source for both heating and air conditioning systems. They also share other components.

Heat is a byproduct of the engine’s combustion process. The coolant in the radiator absorbs the heat. It is then circulated through the heater core before returning to the radiator. The heating system also includes, air ducts, temperature and duct controls, and a blower motor and fan.

The air conditioning system shares air ducts, controls, and blower with the heater, but has its own refrigerant system. The system is composed of: a compressor, condenser, receiver/dryer, orifice tube or expansion valve, and evaporator core.

Automobile AC systems have components that require regular checks to avoid drying out and cracking. The heater also needs regular check-ups to make sure there are no leaky valves or blockages.

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Here are some possible problems:

–          The fan does not work or is noisy

–          Some dashboard controls do not work

–          The vehicle stalls or idles roughly when the system is turned on

–          Vehicle runs hot or overheats

–          There are unusual odors coming through the interior vents

–          The windows fog up when defroster is turned on

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The Coolant System Maintenance

The radiator is the core of your vehicle’s cooling system. The radiator must be clean, leak free, filled with coolant, and clear of blockages.

–          The system does not operate to the temperature set

Coolant that is not maintained becomes acidic over time and degrades the internals of your cooling system. This deterioration results in the structural break-down of hoses, gaskets, and belts. Degraded coolant can also lead to premature water pump failure brought on by deteriorated seals. This means the leaky gasket or hose that you fix today might be the weakest of many weak points in your cooling system. Fixing these one-off leaks could just be a short term solution for a much larger problem. The good news is these issues can be avoided by performing coolant flushes at the intervals recommended by your vehicle’s manufacturer.


Air Conditioning Service and Repair

There are two types of services we provide:

A/C Diagnostics & Repair

If you are having of the problems listed above, come and let a Bowie Auto Clinic service professional check it out for you. To evaluate the problem, we:

–          Perform a visual inspection of A/C components

–          Do performance tests, including:

o       system “state of charge” test and

o       system control test

–          Perform a leak test using approved electronic leak detector

–          If a slow leak cannot be detected, a dye detection service may need to be performed for confirmation.

A/C Retrofit

Our A/C Retrofit service may be needed for vehicles made before 1993, which require costly refrigerant for air conditioning. This service includes:

–          Visual inspection of A/C components

–          System conversion to modern refrigerant

–          If conversion cannot be performed, installation of new compressor may be necessary

If you are having a problem, let the service professionals at Bowie Auto Clinic diagnose it and fix it. And let us perform regular maintenance on your heating and air conditioning system to make sure it is working at peak condition, to keep you comfortable during any weather.

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4 Wheel Alignment

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Signs You Need an Alignment

  • Vehicle pulling to the left or right
  • Uneven or rapid tire wear
  • Your steering wheel is crooked when driving straight
  • Squealing tires

Here’s What We Do

  • Perform a road test evaluation
  • Inspect suspension components
  • Inspect steering components
  • Inspect tire condition
  • Measure alignment angles
  • Adjust alignment angles
  • Reset steering angle sensor (if needed)


Your vehicle is safer to drive and there is much less wear on your tires.

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Maryland Safety Inspection

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Most used vehicles are required by Maryland Law to undergo a safety inspection prior to its sale or transfer.

Bowie Auto Clinic has the latest technology to conduct a full inspection per the State of Maryland’s safety requirements. All inspections are performed by certified technicians.

How Do I Obtain a Maryland Inspection Certificate for My Vehicle?

To obtain an inspection certificate, you must have your vehicle inspected at an authorized safety inspection station in Maryland, such as Bowie Auto Clinic.

We are authorized to inspect:

  • Passenger cars;
  • Light trucks and SUV’s with a gross vehicle weight rating of 10,000 pounds or less; and
  • Trailers that are 20 feet in length or less, without air brakes.

It is best if you schedule the safety inspection first, by calling us at 301-383-1277.  Also, before you take the vehicle to be inspected, ensure that it is properly registered, either in Maryland or in another state.   If you are not able to register the vehicle because it has not yet received a safety inspection, you may qualify for a 30-day temporary registration that will enable you to legally drive the vehicle to the inspection station.

The safety inspection should take about 1-½ hours for most vehicles once the registered inspection mechanic begins work.  Certain vehicles (e.g., trailers) may take less time so it is best to check with us.  When our technician has finished, he will prepare an inspection report that shows the vehicle parts or systems examined and whether or not they have met Maryland’s standards.

If the vehicle meets all safety standards, we will prepare and give you two copies of the Maryland Inspection Certificate.  You should take the MVA copy (green) to any full service MVA branch office and submit it with the other documents needed to title and register your vehicle in Maryland.  The Purchaser’s copy (goldenrod) is for your records.  If a dealer owns the vehicle, the Purchaser’s copy must be affixed to the vehicle’s window.

What happens if my vehicle fails the safety inspection?

If your vehicle fails to meet even one safety standard, the Maryland Inspection Certificate cannot be issued.  You must have the problem(s) identified on the station’s inspection report fixed and then have the vehicle re-inspected by the same registered inspection mechanic at the same station.  You have the option of fixing the problem yourself, having the inspection station fix the problem, or taking the vehicle to another facility for repairs.

If the vehicle is re-inspected within 30 days after the original inspection date and you have driven it less than 1,000 miles, we will only need to inspect the defective equipment identified during the initial inspection.  However, if a new defect is visually observed during the re-inspection, the newly discovered defect must also be repaired and re-inspected.  If you do not have the vehicle re-inspected within 30 days or you exceed 1,000 miles, you will be required to pay for a new, complete inspection.

Most Common Reasons Vehicles Fail Maryland State Inspection

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These are few of the most common reasons why many cars fail Maryland State Inspection, from our experience.


Unlike your car’s body, auto glass, interior and lights, the condition of your brakes can’t be visually confirmed without partial disassembly. And if you haven’t been diligent with the car maintenance, have driven with your emergency brake on, or purchased a used car with unknown history, it’s a good idea to check the brakes and replace them if necessary before they fail inspection.


The minimal tire tread depth that will let you pass the inspection is 2/32 of an inch. You’ve probably heard about the test with a penny. Stick a penny in the tread with Lincoln’s figure upside down and facing you. If at least half of his head is covered, you are good to go. You can also repeat this experiment with a quarter, and if a part of Washington’s head is covered, you are even in a better place with 4/32 of an inch tread depth.


Many drivers don’t realize that most vehicles come with pre-tinted windows. According to the Maryland laws, tinted auto glass must let through at least 35% of light, which means that applying tint that meets this requirement on a pre-tinted window will make the tint too dark to pass the inspection.


If your “check engine” light is on, don’t even bother sending your car for an inspection, because it will inevitably fail.  “Check engine” light may indicate a wide variety of problems from electrical issues to an unfit gas cap and even a failing engine.


This includes dashboard indicator lights, headlights, turn signals and tail lights. All of them need to meet state and federal regulations, be fully functional and adjusted to the correct brightness. Some after-market Halogen and Xenon-based lights, such as bluish high-intensity discharge (HID) lights might not be legal in some states, especially if they are not utilizing vehicle’s existing light source. Call Bowie Auto Clinic, and we’ll let you know if your modified headlights will pass the inspection.

Rust and body rot

This mainly concerns older cars with extensive rust issues and body rot. While you can cosmetically mask the rust, you can’t do much about the body rot except for replacing the rotted piece of auto body, which is often rather expensive.

If your local Maryland Safety Inspection station fails your vehicle for the reasons you disagree with, feel free to come to Bowie Auto Clinic for the second opinion. We won’t fail your car just to make you pay for unnecessary repairs.


The fee for an initial safety inspection at Bowie Auto Clinic is $89.

  • The fee for the re-inspection of a vehicle varies with the inspection station’s labor rate and the specific parts or systems that need to be re-inspected. A re-inspection fee should not be charged if the repair can be visually confirmed (for example, a burned out light) unless the inspection requires jacking, lifting, measuring, or testing the vehicle. A re-inspection fee for a non visual defect may be charged at up to 1-1/2 times the hourly labor rate if the inspection requires jacking, lifting, measuring, or testing the vehicle. You should inquire about the re-inspection fee before leaving the station.

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BG Air/Fuel Induction Service

Why Do I Need BG Air/Fuel Service?

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Deposits accumulate on intake valves, injectors, ports, fuel injectors and combustion chambers causing loss of power, rough idle, hesitation, misfire, pinging, knocking, mileage and hard starting.

Here’s What We Do

  • Clean fuel injectors
  • Clean throttle body
  • Clean plenum and air-intake
  • Clean intake valves and ports
  • Remove combustion chamber deposits
  • Correct balance of fuel and air in system


Reduced emissions – Restored horsepower – Increased fuel economy – Engine starts and idles smoother and runs quieter.

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Power Steering Flush

Why Do I Need To Get My Power Steering Fluid Flushed?

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Over time, small amounts of wear products (bits of plastic, rubber and metal from inside the system) build up in your power steering fluid.  These can accelerate wear to the seals.  The only way to remove these small particles is to remove the old power steering fluid and add new fluid.

Here’s What We Do

  • Inspect seals and hoses for leaks
  • Drain old fluid
  • Replace with new fluid and run engine until the fluid being drained is clear
  • Re-inspect seals and hoses
  • Test power steering


Ensures proper power steering performance and increases lifespan of your power steering system components.

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Brake Flush

Why Do I Need To Get My Brakes Flushed?

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The fluid in your brake lines absorbs water. As water and dirt get into your brake system, they reduce performance and can eventually corrode your brakes.

Recommended once every two years or 30,000 miles.

Here’s What We Do

  • Inspect brake lines for leaks
  • Drain old fluid from master cylinder
  • Fill master cylinder with new brake fluid
  • Bleed each brake until brake fluid runs clear
  • Replace bleed screws (if necessary)
  • Refill master cylinder
  • Test brakes


Ensures proper brake performance and increases lifespan of your brake system components.

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Transmission Flush

Your Transmission

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Your transmission is crucial to the proper functioning of your vehicle. If your transmission fluid is old and contaminated, it can cause expensive damage. And if your transmission filter is clogged, your engine will not be able to shift gears effectively. Whether you drive a manual transmission or automatic transmission, the auto service experts at Bowie Auto Clinic have the necessary experience for performing whatever maintenance it needs, from a fluid check or filter replacement to a system flush or transmission replacement.

A Transmission Flush

Getting a transmission fluid change and transmission flush is important maintenance for your vehicle’s health – that’s why vehicle manufacturers recommend regularly scheduled transmission service. If you keep up with your transmission maintenance, your car can run newer, stronger longer. Our expert auto technicians can take care of all your vehicle transmission needs and keep your car functioning at peak performance.

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Signs You May Need a System Flush

  • Transmission Grinding or Strange Noises
  • Problems Shifting Gears
  • Slipping Gears
  • Surging of the Vehicle
  • Delay in Vehicle Movement

What We Do:

  • Perform a road test evaluation
  • Inspect the transmission for leaks
  • Drain the transmission fluid
  • Run new transmission fluid through the system to remove grime and contaminants
  • Fill with new transmission fluid
  • Change filters and gaskets as necessary

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Coolant Flush

Why You Need a Coolant Flush

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A coolant flush  helps ensure maximum performance from your car’s heating and cooling systems.

The heating system works off of the same coolant that circulates throughout your engine, performing a coolant flush also prevents overheating – the most common cause of breakdowns and internal engine damage.

New antifreeze will help your car’s engine run cooler, and flushing it will remove any dirt, rust or sediment which may damage the water pump and clog the engine water jacket and radiator.

4 Reasons You Need a Coolant Flush

  • Removes Rust and Scale Deposits
  • Lubricates the Water Pump
  • Removes Contaminants
  • Protect Against Rust and Foam

Here’s what we do when our trained technicians perform a coolant flush on your vehicle:

  • Pressure Test Cooling System
  • Inspect System for Leaks
  • Power Flush System
  • Set Coolant to Proper pH Level
  • Set Coolant to Proper Temperature Level

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