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Jeep Engine Rebuild Services

Offering Jeep engine rebuild service on the following legends:

Willys MB 1941-1945  --  Ford GPW 1942-1945
CJ2A 1945-1949  --  CJ3A 1949-1953  -- CJ3B 1954-1963
Jeepster 1947-1950  --  Jeep Wagon, Stake 1947-1950  -- M38  --  M38A1, Pick-Up, CJ5-CJ6, AMC Jeep models 1972-1976

We offer complete rebuild services for all Jeep and Jeep Utility vehicles from 1941 through 1976. Our process starts at ensuring the block is checked for cracks using three separate tests; first, we pressure test, to see if any cracks may be just below the surface. Then, we clean all valve ports, deck and passenger side for magnafluxing. If it passes these tests, we send the block out for synthetic media blasting. With the block free of paint, rust and grease, we magnaflux again. From there, we begin machining and assigning parts to the build. We don’t have a flat cost for engine rebuilds, due to various factors, such as:

  • Long or short block rebuild

  • Client supplied components

  • Type of block required

  • Are we rebuilding some, or all of the components (carburetor, distributor, generator, starter, etc.)

  • Can we used your engine block, or does TJL need to provide one

As you can see, there are numerous factors that go into correctly rebuilding these engines, so please call so we can discuss in detail your requirements.


All estimates include itemized parts recommended along with an approximate time to complete the work. If unseen issues arise while in progress, we will require written authorization before we proceed. All services require 50% of the estimate before we start your project. . If you reside in or take delivery in Minnesota, sales tax will be charged accordingly.  The hourly charge for any service work is $95.00 and we will bill in half hour increments after the first hour.

Core return or charge: If a new engine block, transmission or transfer case is required, a charge for the block, case or crankshaft is required. The core return must be something we can use for future rebuilds.   See below for return core requirements.

If a core is not provided to TJL, the core charge is equal to half the value of the replacement core. Example: a professionally checked engine block from TJL is purchased for $1,000.  If no core is returned we will charge an additional $500. We don't sell blocks or cases which look-good-but-don't-worry-about it.  Instead we provide the best tested engines around. The engine block is the foundation of your restoration.  Cutting corners will only cost you more later.


  • All rod & main bearing caps are present AND are specific to that block

  • Maximum bore diameter does not exceed 60 over standard

  • No heavy scoring, or rust pitting in cylinder walls, cracks or broken castings

  • Acceptable engine cores: October - November 1941 Willys Americar, Ford GPW, Willys MB, CJ2A, CJ3A, CJ3B and any stock standard Jeep specific engine used on Jeep and Jeep Utility vehicles. We can not accept a CJ5 V6 as a core for a rebuilt CJ2A engine, it must be in the same family of engine.

Engines which have been rebuilt by Tonka Jeep carry a 1 year warranty.  If upon return to our shop, we determine the engine was incorrectly installed, or we detect work was done other than what we originally built, or was done improperly, we reserve the right to void the warranty in full.  The customer in this case will be charged for any costs at an hourly rate of: $95.00/hour and shipping costs to and from the customer's location.  If we rebuild an engine for a second time, the warranty is for 30 days.  If there is any question about this, please contact us for clarification. For Willys MB and Ford GPW engine blocks, under NO CIRCUMSTANCES we will use, take-out, N.O.S., or remanufactured GPW or Willys marked HEAD BOLTS. During 1944 the military discontinued the use of these head bolts, in favor of studs and nuts due to numerous sealing issues.