This page describes some of the work that is required to rebuild the BMW 600 transaxle correctly. This service uses the procedures described in the maintenance service manual for the BMW 600. If you do not have the technical knowledge or tools to dismantle, inspect and reassemble a manual transmission with an integral differential, then review this page. It is designed to demonstrate my abilities and give you pricing on this service.
Most transmissions are received complete and undisturbed. This is by far the most desirable and least expensive option when considering a rebuild. If the unit has been opened and partially dismantled, the possibility of damage to components or loss of parts increases dramatically.
After the case is thoroughly cleaned on the outside, it is dismantled and each part is closely inspected.
Below is a view of the gear set and differential after being removed.
At this point all parts are completely disassembled and inspected. Not shown in the photos below, but the differential is also completely disassembled and inspected.
If damaged parts are identified, the customer is notified and together we determine the best course of action. Many customers want everything inside to be 100% while others will elect for less knowing that they will not be operating their machines more than a couple of 100s miles a year. I will make my recommendations based on past experience, but the final decision is always the customers.
In the case shown at the right, it was decided not to replace this gear. This is the mesh point for the reverse gear. The damage was localize and did not progress into the gear face. Had this been one of the 4 forward gears, I would have recommended it be replaced.
After inspection, new bearings are installed in each location. The first part of reassembly is to install the "stripped" pinion shaft (this is the pinion shaft without any of the gear set, only the new bearing and special spacer tool is mounted on the shaft). This is done to set the proper backlash and mesh between the ring gear and pinion gear. This process requires the differential to be installed and removed several times to obtain the correct shim settings.
Proper mesh of the gears is checked with dye. The photographs below show the proper mesh pattern that is expected for proper gear alignment.
The next major step is to reassemble the gear set. This requires the removal of the pinion shaft from the case and careful assembly work as outlined in the manual. Most transmissions are equipped with rubber stops for the synchronizers which must be replaced with new. These can be seen in the photo below (right) as white pieces.
The gear set, input shaft, and reverse gear are all assembled at one time. The shifter forks and other devices are then installed prior to the front case half being placed over the gears.
After final assembly of the case halves, the axle shaft sprockets are installed and torqued to specified foot pounds.
The cost of a rebuild assuming no internal damaged gears, synchronizers, or shafts would run as follows:
This estimate was last updated on 8/12/2021
Seals and Gaskets
Misc. boots and rubber parts
Synch. rubber stops (if required)
Throw-out Bearing (if required)
Labor (includes all supplies, and overhead)
All work carries a 1 year warrantee on workmanship.
I retired from my full time job in March of 2019 and have since caught up on my backlog (mostly). If you need work done, I can start on your items very quickly! Like Floyd the barber - two benches - no waiting!!
If you would like a photo pictorial of the tear down and rebuild of your transmission, please let me know at the time it is shipped. I will provide a very detailed set of high resolution photos on a CD for an additional $100.
Please understand this is only an estimate based on a transmission in fairly good condition that needs new bearings, seals and cleaning. If there are damaged gears or shafts, the cost will be much higher. Gears are not easy to find for these units and a price estimate would not be practical on this web page. If the throw out bearing has to be replaced, you can figure an additional $100.00
If you wish to contact me to discuss this further, you may call me on weekends or week days between 10am and 9:00pm Eastern time. My cell number is 843-845-4742. Please do not call at "odd hours" and if I do not answer, leave a message - I will return the call.