Duramax Shop. Warranty  

Our Process 

• A comprehensive process is implemented for every engine, which involves completely disassembling it and carrying out a thorough cleaning to eliminate any factors that could contribute to premature engine failure.
• The blocks and cylinder heads are closely examined for any cracks or casting defects using magnetic particle inspection methods.
• All cylinders are meticulously bored, honed, and precisely measured with CNC machines to achieve accurate tolerances.
• The surfaces of the blocks and cylinder heads are machined at the required angle and scrutinized with a profilometer to ensure an optimal surface finish.
• The valves, valve guides, and seats are replaced as required and machined in accordance with OEM specifications.
• Each crankshaft is subjected to comprehensive reconditioning and balancing in accordance with OEM guidelines.
• Every connecting rod is carefully machined and matched to specific crankshafts and engine specifications in compliance with OEM regulations.
• A standard set of new parts is provided to all long-block engines.

Purchaser’s Responsibility 

A copy of the Warranty Activation Form must be filled out and sent back within 30 days of receiving the newly remanufactured engine. The return of the engine core and all necessary parts is the exclusive responsibility of the customer, not the installation. The core shall be constructed, finished, and delivered in the container where the new, remanufactured engine was received within thirty (30) calendar days. Your current core can be returned for free to the Duramax shop. Please be advised that the terms of this warranty shall be examined if the conditions of the core return are not met.

 

 

Installer’s Responsibility 

The installer is accountable for ensuring that the engine and its accompanying components are suitable for the intended use and are functioning correctly. It is necessary to prime the oil system using air over a hydraulic pump or a comparable device. Using the starter to prime the oil system will VOID any and all warranties.   

The following issues must be handled by the installer:

> Clean and test fuel injectors at a reputable fuel injection facility, or replace them with new stock injectors.

> Remove and flush the cooling system's air.

> Replace the oil cooler, oil cooler lines, and all other block lines that are connected to it.

> If necessary, replace the air compressor.

> Restart the computer and run a scan to ensure proper functionality.

Terms of Warranty 

This warranty covers only defects in materials and workmanship under the conditions, limits, and timetables specified herein. Damages resulting from accidents, modifications, or negligence in adhering to maintenance requirements are not covered by this warranty. Any usage of the product outside of its intended application, such as competitive racing, is not covered by this warranty. Additionally, any racing-related components, including aftermarket or new turbos, blowers, fuel systems, and modified computer systems, as well as any other modifications not included by the original equipment manufacturer (OEM), are excluded from coverage. Instructions on how to use the product can be found in the Owner's Manual.  

The Owner's Manual of the vehicle provides guidance on how neglectful maintenance can result in damage, which is not covered under this warranty. Adequate levels of fluids, lubricants, oil, and fuel are all components of routine maintenance. To ensure that warranty claims can be processed, it is recommended that copies of any maintenance-related receipts be kept. This warranty does not cover towing, accommodation, travel expenses, lost wages or sales, injury, fatality, or any other incidental damages that may arise from using, maintaining, installing, or repairing any component. Any part not supplied by the Duramax shop, including filters, fluids, sensors, belts, hoses, injectors, gaskets, etc., is not eligible for a refund. This warranty will be void if the engine is altered (disassembled, dismantled, modified, etc.) without first obtaining written consent from a Duramax shop.

Any disputes arising from or related to this agreement or any other relevant matters outlined in the purchaser's agreement shall be subject to the exclusive jurisdiction of either the General District Court or the Circuit Court of Suffolk County, New York. The interpretation and enforcement of this agreement shall be governed by the laws of the State of New York. The buyer agrees to cover all legal costs incurred by the Duramax shop in relation to any disagreements arising from this contract.

Warranty Term 

1 Year – Unlimited Miles Parts Only No Labor   

On all Long Blocks, and complete drop-in engines  

1 Year – Unlimited Hours Parts Only No Labor  

On Marine Long Blocks (Gasoline and Diesel), Industrial On-Road vehicles: Motor homes, registered vehicles over 1 ton. Off-Road Industrial: Commercially registered vehicles or equipment, Agriculture, and Generator Engines.  

6 Months – Unlimited Miles Parts Only No Labor  

On all Short Blocks (Gasoline and Diesel) 

Limitations

This warranty excludes coverage for issues arising from improper installation or the reuse of components not originally included with the new engine. Such issues include but are not limited to:

 

• Damage caused by detonation/pre-ignition resulting from modified or faulty fuel systems or computer systems, including tuners and chips.
• Any alterations made to emission systems.
• Overheating due to faulty cooling systems (e.g., bad radiator), oil pressure gauges, fuel systems, computer systems, or water pressure loss.
• Damage caused by computer codes not being addressed or repaired in accordance with OEM calibrations.
• Damage to cylinders, pistons, or rings resulting from overheating, detonation, foreign objects in the combustion chamber, faulty fuel system, or over-boosting of the turbo.  

Filing a Warranty Claim 

 

To initiate a warranty claim, the Warranty Claim Form must be completed and submitted prior to any repair work. The form can be found on our website at www.Duramaxshop.com or by contacting us at +1 (404) 905-5524.

Once the engine installer confirms that the engine failure falls under the conditions of the warranty policy, they must contact the Duramax shop. Duramax shop will review the claim and approve any necessary repairs in writing. Authorized repairs must be acknowledged and signed for by a Duramax shop representative.

After approval, the engine or any parts relevant to the warranty claim must be shipped to the Duramax shop at the purchaser's expense. Duramax shop will specify which parts need to be returned based on the Warranty Claim Form. A comprehensive investigation will be conducted by the Duramax shop to identify the cause of the failure.

No warranty claims will be considered if there is an outstanding balance or any unreturned cores. The purchaser must complete and submit all necessary paperwork before the warranty claim can be processed. 

Breaking In Remanufactured Engines

In order for piston rings to sit properly, engines must be properly broken in. Oil consumption issues might arise if an engine is not properly broken in. Piston rings are made to exert a specific tangential force. Compression rings rely on increased combustion pressures to push them outward towards the cylinder wall and down towards the bottom of the piston's ring lands. These rings won't seat or seal properly without this combustion force. Oil film is left on the cylinder wall to lubricate the oil control rings to control the compression rings. Each compression ring removes a small quantity of oil film for proper oil control.

While piston rings can seat without the aid of a dynamometer, a sufficient load on the engine is necessary to provide sufficient combustion pressure and temperature for the rings to seat. This procedure is very important within several hours of the engine's new service life. Not enough combustion pressure will be produced by idling, revving up, or pulling low loads to seat new rings.

According to research, the best results for getting piston rings to the seat are obtained by reducing idle time and running a freshly remanufactured engine at 75% of full load for the first three to four hours. All manufacturers agree that after initial start-up and tests are finished, adding a load to the engine is essential for seating the rings, even though the load and duration vary depending on the manufacturer. Oil consumption may rise as a result of delaying the load process.  

NOTICE: Approved Lubricants 

The performance of the piston rings can be impacted by the kind, brand, classification, and oil grade utilized during the engine break-in phase. It is preferable to use an OEM-recommended oil. Only use break-in oils and additives in accordance with the manufacturer's instructions.

Pre-Ignition/Pre-Installation Engine Procedures  

• Fill the engine with new oil.
• Perform the priming procedure, and if you require technical assistance, please contact us at +1 (404) 905-5524.
• Inspect the front and rear crank seals to ensure that they are in good condition.
• Verify that the turbo unit is clear, clean, and in good working order. Failure to perform this step may result in engine damage due to oil flow back containing broken fragments.
• The radiator must undergo a flow check and be repaired as needed.
• Replace the oil cooler and oil lines to prevent engine damage from fragments in the oil from the cooler and lines.

Warranty Activation Form

The purchaser, installer, and vehicle information must be completed and this form returned to the Duramax shop. within 30 days of purchase to activate the warranty. This form can be returned by mail to 3599 Cantrell Industrial Ct. NW Acworth, GA 30101; by fax to +1 (404) 905-5524.

Warranty Checklist  

Purchaser Name:            

Purchaser Phone Number:                                                 

Purchaser Order Number:   

• Proof of purchase from our Duramax shop.
• Proof of injector cleaning from an authorized shop or proof of new injectors.
• Proof of cleaning/flush for the cooling system.
• Proof of new oil cooler, oil filter, oil cooler lines, or any other parts related to the initial failure.
• Proof of new or remanufactured turbo, injector pump, or high-pressure pump.
• Proof of new air compressor, if applicable to the vehicle.

Please ensure that all necessary documents are provided for a smooth and efficient warranty claim process. If you have any questions or concerns regarding the required documents, please do not hesitate to contact us for assistance.

 

ALL ITEMS MUST BE COMPLETED BEFORE THE WARRANTY CLAIM WILL BE PROCESSED  

Diesel Long Block Core Return / Charge and Purchase Process  

Below is a comprehensive outline of our core return criteria and the diesel long block core return process.

Core Return Criteria:

1. A long block core that is returned with a broken crankshaft, broken connecting rod, broken camshaft, or broken valve will be deemed an unacceptable core and a core charge will be billed.
2. A long block core that is returned with a visible hole/crack in the block or cylinder head will be considered an unacceptable core and a core charge will be billed.
3. An unassembled, incomplete, or long block core that cannot rotate 360 degrees will be deemed an unacceptable core and a core charge will be billed.
4. Any core that is returned but considered unacceptable will be subject to a 50% to 100% core charge.
5. Any core that is not returned will result in a 100% core charge, and your warranty will be void.
6. We have up to 90 days to complete the core inspection from the time of return and process any applicable fees.

PRIOR TO RETURNING THE CORE, PLEASE INSPECT THE CORE TO AVOID ANY UNFORESEEN CHARGES. CORE ENGINES RETURNED AFTER THE SPECIFIED THIRTY (30) DAYS MAY BE SUBJECT TO A LATE CORE RETURN FEE OF 20%.

NO REFUNDS WILL BE OFFERED FOR CORE RETURNS AFTER 90 DAYS FROM DELIVERY.

Diesel Long Block Core Return / Charge and Purchase Process:

Step 1: Receiving

We will ship the long block via truck freight to the address provided on the order form. For optimal delivery, we recommend shipping to a commercial business address with 9-5 Monday thru Friday business hours. The long block engine will need to be unloaded with a forklift or loading dock.

Delivery services are available for limited-access locations such as a church, schools, farms, at-home businesses, or residences. Additional freight charges will apply for these types of deliveries.

Locations without a forklift or loading dock will require a lift gate-equipped truck to deliver their long block, and this can be arranged for an additional fee.

Please note that a 20% restocking fee will apply for any engine that is returned before installation, and a 5% service charge will apply for any order that is canceled by the customer prior to engine shipment.

Step 2: Unwrapping and Inspection

Upon receiving the long block, you will need to unwrap the engine and conduct a side-by-side comparison of the new engine and the one you removed from your vehicle or equipment.

It is the customer’s responsibility to ensure that the long block we ship you is VISIBLY the same as the long block that is being replaced. Check the bolt-hole locations, branch tube design, gear-train housing style, etc., BEFORE any parts are installed. We ship you a long block for the engine serial number or VIN you provide, but a VISUAL check is always best.

Step 3: Transfer Parts

After verifying that you have received the correct long block, you can begin transferring the parts from your old engine. You will be shipped a gasket set which will include most of the necessary gaskets for engine installation. You will be responsible for supplying any additional gaskets for the installation that are not included with the long block.

Step 4: Install New Engine

You will receive an envelope with your new long block which will include warranty and core return documents. It is the customer's responsibility to review all the paperwork received with the shipment. Our installation instructions only cover the main mistakes made during installation. Refer to an OEM service manual for installation procedures. Additionally, ensure the installer is highly knowledgeable.

Step 5: Return the Core

When returning the long block core, you must ensure that it is returned in the same manner as the remanufactured long block you received. If the long block was shipped in our wood crate, you must strap the core back into the crate and screw the top back into place. You should attach the return shipping label provided by our core department to the core and call to schedule a pick-up time that is convenient for you. Our core department will provide you with two copies of the return shipping documents, one of which must be given to the driver, while the other should be retained for your records.

Please note that if you fail to attach the copy of the warranty complaint as a packing slip with the engine shipment, there may be a delay in processing.