One of the biggest issues on the 5.9L/6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The SPELAB Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform.
The rear cylinders on the 5.9L/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.
2003-2007 Dodge Ram Cummins 5.9L (Only Manual Transmission)
2007.5-2018 Dodge Ram Cummins 6.7L (Manual & Automatic Transmissions)
- Lowers coolant temperature at the rear cylinders
- Ensures consistent temperatures across all cylinders
- Prevents damaging coolant pressure build up
- Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation
Warranty: 12-month warranty and contact us freely if you meet any problem.
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Cancel your order free of charge when it is unfulfilled; you can not cancel order once it is fulfilled.
You have 14 calendar days to return the item from the date you received it.
To be eligible for a return, your item must be unused and in the same condition that you received it. Your item must be in the original packaging with their tags still attached. Please make sure when returning something that you securely package the item as anything damaged in the post and returned back to us due to being insufficiently packaged may receive no refund.
Please contact us at any time from Monday to Friday within 14 days after you received the item. Email us at firstname.lastname@example.org. Return shipping address will be provided.
You are to return the item at your own expense. We'll pay the return shipping costs if the return is a result of our error (you received an incorrect item, etc.).
Once we receive your item, we will inspect it.
Ensure you enclose the correct and complete item when making a return. We need the correct item returned in order to grant a refund or a replacement. It can take up to 7 days for an item to be inspected after reaching. After the inspection, it takes 2 business days for the refund to be processed. You will receive the credit within a certain amount of days, depending on your card issuer's policies. Refunds will be issued back to the original method of payment or credit card only.
Provide 12-month product warranty. When you meet any problem about Spelab product, contact us freely.
Installation of auto parts should be handled by a Certified Automotive Technician, and you should maintain a copy of the repair order after the repair is completed for your records. Remember, that having a certified technician install a part does not necessarily mean it was properly installed, but it will eliminate more of the common errors. On occasion, we may ask for the original repair order and other documentation regarding the repair to be sent to us in order to process the return. If your part is found to be defective, we'll send you the auto parts or refund you if necessary.
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Our products are free shipping with orders over $15.
Normally, we will ship the product customer ordered from the nearest warehouse. Customers will get their items in 5-10 work days. However, we can not promise products customers want are in stock every time. Transfer cargo needs more time.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are nonrefundable.
If you have any questions on how to return your item to us, contact us.