Big Bear Engine Company

Big Bear Engine Company Specialists in remanufactured, surplus and used Cummins 4BT, 6BT & Caterpillar 3306 Diesel Engines. All machine work is done in house in Denver, CO.

We specialize in new surplus Cummins 4BT, 6BT and Caterpillar 3306 diesel engines. In addition to surplus engines we are also a full service machine shop and engine remanufacturing facility. We also are a dealer for aftermarket parts with over 100,000+ parts available for all of the biggest diesel engine brands including Caterpillar, Cummins, Detroit, International, John Deere and Mack.

"Needed an engine for a generator ASAP and big bear stepped up. Pricing within the hour. Engine in stock with several op...
06/18/2026

"Needed an engine for a generator ASAP and big bear stepped up. Pricing within the hour. Engine in stock with several options of how we wanted it. Was even able to ship with a gasket kits so no need for ordering from other suppliers. They were able to work with our own shipper and customs broker to get the engine shipped out fast. Engine quality was amazing, paint was top quality. Generator is up and running with a.." says Garrett on Google

★★★★★ Needed an engine for a generator ASAP and big bear stepped up. Pricing within the hour. Engine in stock with several options of how we wanted it. Was even able to ship with a gasket kits so no need for ordering from other suppliers. They were able to work with our own shipper and cus...

"Found there website searching the web.Ordering and payment options were simple.Sales team and staff were extremely help...
06/14/2026

"Found there website searching the web.
Ordering and payment options were simple.
Sales team and staff were extremely helpful and checked in with me the day after it arrived. I would recommend them to anyone needing a new engine." says Justin on Google

★★★★★ Found there website searching the web. Ordering and payment options were simple. Sales team and staff were extremely helpful and checked in with me the day after it arrived. I would recommend them to anyone needing a new engine.

"Bought a qsl9 cummins from Big Bear Engine Company. Engine has been flawless from first start. We have put around 100 h...
06/13/2026

"Bought a qsl9 cummins from Big Bear Engine Company. Engine has been flawless from first start. We have put around 100 hours on it now, no issues and it didn't use more than a quart of oil during break-in and the best customer service in the industry." says Ty on Google

★★★★★ Bought a qsl9 cummins from Big Bear Engine Company. Engine has been flawless from first start. We have put around 100 hours on it now, no issues and it didn't use more than a quart of oil during break-in and the best customer service in the industry.

"From start to finish my experience with Big Bear Engine Company was seamless. Everyone there were so helpful and very i...
06/10/2026

"From start to finish my experience with Big Bear Engine Company was seamless. Everyone there were so helpful and very informative. I received my engine fast and was back in business in no time at all. I highly recommend Big Bear for all your engine needs." says Rick on Google

★★★★★ From start to finish my experience with Big Bear Engine Company was seamless. Everyone there were so helpful and very informative. I received my engine fast and was back in business in no time at all. I highly recommend Big Bear for all your engine needs.

"fast shipping and great communication." says Chris on Google
06/08/2026

"fast shipping and great communication." says Chris on Google

★★★★★ fast shipping and great communication.

"Both Patrick and Nikki were a treat to deal with on our recent engine purchase. I love calling somewhere and having zer...
06/05/2026

"Both Patrick and Nikki were a treat to deal with on our recent engine purchase. I love calling somewhere and having zero doubt that the person I am talking to knows their product. Patrick knows Cummins engines very well; you don't get that help from Cummins directly when dealing with B and C series engines." says Dave on Google

★★★★★ Both Patrick and Nikki were a treat to deal with on our recent engine purchase. I love calling somewhere and having zero doubt that the person I am talking to knows their product. Patrick knows Cummins engines very well; you don't get that help from Cummins directly when dealing with...

"this is the 3rd year I have purchased a total of 6 engines from Big Bear Engine Company for our college Diesel Program....
06/05/2026

"this is the 3rd year I have purchased a total of 6 engines from Big Bear Engine Company for our college Diesel Program. the students and instructors are very pleased with the quality and their service is unmatched. After years of putting engine purchases out for bid Big Bear always comes out on top. Centralia College Diesel Technologies." says Clint on Google

★★★★★ this is the 3rd year I have purchased a total of 6 engines from Big Bear Engine Company for our college Diesel Program. the students and instructors are very pleased with the quality and their service is unmatched. After years of putting engine purchases out for bid Big Bear always c...

"They were excellent to work and went the extra mile to get the correct engine makeup for my application even when we di...
06/05/2026

"They were excellent to work and went the extra mile to get the correct engine makeup for my application even when we didn't have a good original engine serial number to go off from." says Eric on Google

★★★★★ They were excellent to work and went the extra mile to get the correct engine makeup for my application even when we didn't have a good original engine serial number to go off from.

"They were very easy to work with, and everything has worked very well." says Todd on Google
05/31/2026

"They were very easy to work with, and everything has worked very well." says Todd on Google

★★★★★ They were very easy to work with, and everything has worked very well.

"I purchased two 4JB1 units with PTO. I set them up on trailer setups moving 3x2 water transfer pumps. They do just fine...
05/30/2026

"I purchased two 4JB1 units with PTO. I set them up on trailer setups moving 3x2 water transfer pumps. They do just fine the Hot Summer of South Texas heat." says John on Google

★★★★★ I purchased two 4JB1 units with PTO. I set them up on trailer setups moving 3x2 water transfer pumps. They do just fine the Hot Summer of South Texas heat.

Address

18540 Apache Drive #160
Parker, CO
80134

Opening Hours

Monday 7:30am - 4:30pm
Tuesday 7:30am - 4:30pm
Wednesday 7:30am - 4:30pm
Thursday 7:30am - 4:30pm
Friday 7:30am - 4:30pm

Telephone

(720) 920-9162

Website

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