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On Demand Video
Mercedes Monovalve Installation - On Demand Video
$9.99

Monovalve Heater Control Inspection - Installation - Testing - On Demand Video Manual

Covers 1981 to 1991 W123 W107 and W126 with automatic climate control panel

If you have a 1981 to 1985 W123 300D, 300CD, 280E, 280CE, 300TD or a 1981 to 1989 W107 380SL, 560SL, or a 1981 to 1991 W126 380SE/L 300SD 500SE/L 300SDL 420SE/L 300SE/L 560SE/L 380SEC 560SEC that has automatic climate control this video manual will apply. These c

On Demand Video
$12.99

Transmission Bowden Shift Control Cable Removal and Replacement - On Demand Video

Specific instructions for 1981 to 1985 Turbo Diesel Automatic Transmissions

The bowden cable runs from the transmission to the throttle linkage on many Mercedes from the early 1980's up through the early mid 1990's. When this cable fails or is out of adjustment the transmission will either shift too early or too late.

On Demand Video
$6.99

M103 and M104 Straight Six Serpentine Belt Removal and Replacement - On Demand Video

For 1986 to 1993 Six Cylinder gas engines - both single and twin camshaft.

If your serpentine belt is starting to crack or the back side is worn smooth, you need to replace it. If you are hearing strange noises from the front of your 1986 to 1993 six cylinder gas engine, you will need to remove the belt to troubleshoot the problem.

On Demand Video
Temperature Gauge Fix - On Demand Video
$6.99

Faulty Engine Temperature Gauge Troubleshooting and Repair - On Demand Video

Learn from this challenge some basic automotive electrical troubleshooting procedures

If your engine temperature gauge is not reading at all, you need to fix it before you keep driving the car. To ignore this could lead to major engine failure, since you will have no way to get an adequate warning that your engine is about to overheat.

On Demand Video
$7.99

Outside Rear View Mirror, Removal, Service and Repair - On Demand Video

Applies to most models 1973 to 1985 w/ manual mirrors - W114, W115, W107, W116, W123 and early W126 driver side

Is your driver side or right side manual adjusting mirror getting difficult to adjust? Is the mechanism broken or will not hold adjustment? Does the mirror glass need replacing? Repairing these types of problems is definitely something you can do yourself!

$115.00
Currently out of stock.

617 TURBO and Late 240D Diesel Aluminum Alternator Mounting Bracket

BOTTOM BOLT INCLUDED: Not corroded: Fits 1978 to 1985 300SD and 1982 to 1985 240D 300D 300CD and 300TD - Last one we have.

Last one we have. An excellent used bracket that bolts to the engine block to mount the alternator. The bolts in this bracket often get frozen to the aluminum and require cutting. The only solution is to get another bracket as shown here. Not difficult to install.

$79.50

Automatic Transmission Shift Rod Bushing Replacement Tool Kit - New Bushings Included

For LATE MODEL (70-73) 108 109 and ALL 114 115 107 116 123 126 201 124 129 and 140 chassis 1968 to 1995

The plastic shift bushing is a very common part that needs to be replaced on older Mercedes. Can you believe it is the exact same part that was used on all models for over 25 years! It is an inexpensive part that can cause big problems if it breaks out.

$148.00
Currently out of stock.

OM617 Turbo Diesel Alternator - Used

Fits 1978 to 1985 300SD and 1981 to 1985 TURBO 300D 300CD and 300TD

Very good used turbo diesel Alternator. Good working condition just removed from running engine . Good bearings. No noise. Voltage regulator removed and inspected (good brushes). Ready to install on your engine. 

Sale
$118.00
Currently out of stock.

Late W123 Early W126 Steering Wheel USED - Only One Available

Fits W123 240D 300D 300CD 300TD and 126 380SE 380SEL 300SD all from 1981 to 1985 ( non airbag ONLY )

Good used steering wheel as shown.  Not perfect but above average. It is worn somewhat at the top but still has a grain on other parts of the wheel. The rubber is very firm on the ring  ALL the way around the wheel. No chunks are torn out of the rubber. Getting hard to find them even this nice.

$19.60

OM 616 OM 617 Diesel Engine Oil Drain Plug Magnetic Pickup - SUPER STRENGTH

Stainless steel! For 1977 to 1985 Diesels in W123, W116 and W126 chassis passenger cars up through 1985.

This engine oil drain plug can help extend the life of your old diesel engine. It is not a normal drain plug, nor is it some cheap magnetic drain plug that will pick up a few paper clips! This one has to have the strongest magnet in the world for its size.

$86.50

Lower Front Seat Spring Sag Repair and Restoration Kit

For ONE 116, 123 and 126 Chassis Sedans, Coupes or Wagon Seat Bottom

For ONE 116, 123 and 126 Chassis Sedans, Coupes or Wagon Seat Bottom. This unique kit is designed to help you repair and restore one broken down front seat bottom so common in the 116, 123 and 126 chassis Mercedes built from 1973 to 1991.

$259.00
Currently out of stock.

5 Cylinder 617 300D 300TD 300SD Physical Exam Kit

Check the Health of your Diesel Engine Yourself - Save BIG $$$

If you are going to buy or have just purchased an older 5 cylinder Mercedes Diesel (1975 to 1985) the first thing you need to do is a good physical exam of the engine. Don't throw money at a car that has a dying engine.

Sale
$30.00
Currently out of stock.

Miracle Paint For Permanent Rust Repair PINT Black - Free Brushes and Gloves

PLEASE NOTE: This kit contains liquids that can only be shipped by UPS ground. Due to this requirement we can only ship to the continental lower 48 States Sorry for this inconvenience.

NEW and improved HD formula. This new formula has a thicker viscosity for easier application on vertical surfaces and when using fiberglass cloth.Miracle Paint is a unique moisture cured non-porous paint that bonds to rusted and corroded metals like no other coating.

Sale
$45.00

Miracle Paint For Permanent Rust Repair QUART Black - Free Brushes and Gloves

Receive Related Bonus-Product Free! (Can only be shipped UPS Ground)

NEW and improved HD formula. This new formula has a thicker viscosity for easier application on vertical surfaces and when using fiberglass cloth. Miracle Paint is a unique moisture cured non-porous paint that bonds to rusted and corroded metals like no other coating.

$49.95
Currently out of stock.

616 617 Diesel Vacuum Connector Service Kit

For 1975 to 1985 240D 300D 300CD 300TD and 300SD with the 61x diesel engine

FITS THE FOLLOWING: 115, 116, 123, and 126 chassis. Here is a diesel item I have put together that every Mercedes diesel owner should have.

61x Diesel Automatic Transmission Tuning Manual
$24.50

Diesel Automatic Transmission PEAK Performance Tuning Manual by Kent Bergsma

Receive two related On-Demand videos FREE! Covers ALL Diesel Automatics from 1969-1984 220D 240D 300D 300CD 300TD 300SD

I have received so many emails on this topic that I had to sit down and write a very detailed manual over 130 pages in length!  Let's face it! Diesel automatic transmissions can be troublesome, particularly those models that use vacuum to control shifts.

$19.50

Brake Systems Troubleshooting Inspection and Repair by Kent Bergsma

PRINTING MANUAL AGAIN AS OF JULY 2025!

Covers 1965 to 1995 110, 111, 112, 108, 109, 107, 114, 115, 116, 123, 126, 201, 124, and 129 Chassis master cylinder, pads, rotors, calipers and flexible brake hoses. Only covers models with 4-wheel disk brakes. DOES NOT COVER drum brake repair. 

$204.50

126 Chassis Rear Bilstein Shock Set of (2) COMFORT

PDF Digital instructions included

Fits 126 Chassis 1981 - 1991 EXCEPT 560SEL. The best way to restore the original ride and feel of your Mercedes is to replace your shocks with new Bilsteins. There is no other shock that will perform as well. These are OEM COMFORT shocks that give you the smoothest ride.

$199.00

116 126 Chassis Rear Bilstein Shock Set of (2) - HEAVY DUTY

Fits all models with standard suspension - for firmer ride with heavy loads - PDF Digital Instructions cover W126 chassis only principles are the same for the W116

Fits all models list below without Self Leveling Rear Suspension. The best way to upgrade the original ride and feel of your Mercedes is to replace your shocks with new HEAVY DUTY Bilsteins. There is no other shock that will perform as well.

$126.75

615 616 617 Diesel Valve Adjusting Wrench Kit - Designed by Kent Bergsma - Made in the U.S.A.

For adjustable valve clearances on 190D 200D 220D 240D 300D 300CD 300TD 300SD 1961 to 1985. Written instruction booklet included.

These wrenches are fantastic labor savers. If you have been thinking about adjusting your diesel's valves yourself.  This kit will save you time, frustration, and high shop labor costs. Now is the time to get your own pair. NOW WITH RUBBERIZED GRIP HANDLES. Made in the U.S.

$368.50
Currently out of stock.

1990 to 1995 201 126 and 124 Chassis Ignition Lock and Key Assembly Refurbished w/ Detailed Instructions

Locks are NLA. SEE SEVERE WARNING BELOW. No cable cam included. Used OE steering lock and cap. New aftermarket key tumbler installed and new switch included..

NO WARRANTY IF YOU LOCK THIS UP. If you take it apart to install the transmission lock-up cam, do not "play" with it. Do not turn the key fully on until you have installed the lockout cam, rear electrical switch, and the cable for the transmission.

$129.00

W123 W126 OM617 Turbo Diesel Transmission Ultimate Diagnostic and Tuning Kit

116 and 126 1978 to 1984 300SD, 1980 to 1984 123 240D and 1981 to 1985 123 Turbo 300D 300TD 300D 300CD. Does not apply to the 722.4 transmissions found in most 1985 models

INCLUDES TRANSMISSION PEAK TUNING MANUAL.  DO NOT ORDER SEPARATELY. Bonus videos are included free. To properly tune your diesel transmission, you will first need the know-how and then the equipment to adjust your transmission modulator and your VCV transmission shift valve.

$298.00

NEW 1980 to 1987 Diesel W123 W126 Steering Lock and Key Assembled and Tested w/ Instructions

All NEW parts. Assembled, lubed, and tested in our shop. Electrical Switch NOT included but can be ordered separately below. Instructions are via Kent's written manual and new 44-minute video.

Fits 1980 to 1985 240D 300D 300CD 300TD and 81 to 87 126 300SD 300SDLThe lock and release mechanisms inside wear out over time, and when that happens, a new tumbler assembly will NOT fix the problem. If the internal wear is severe, the lock may not be repairable.

126 left upper control arm
$69.75

126 Chassis Left (Drivers side) Front Suspension Upper Control Arm

For all W126 sedans and coupes 1981 to 1991

This is a very common wear item on high mileage 126 chassis. It will start out as a clunking noise when you go over rough ground. When real bad it will be hard to get your car to track right down the road  (it will want to wander) and you will experience rapid and uneven tire wear..

$227.00

Diesel Fuel Injector Balance Pressure Tester - Yes, You Can Do It Yourself!

Version 3 release - Improved fluid handling design - Watch the video below for reasons behind the changes.

For all MBZ diesel engines 1950 to 1999. Designed by Kent Bergsma. These are built at Mercedessource to control quality and production demands. Each one is tested here in our shop before shipping.

$9.80

3 Dome and Trunk Light Bulbs + 3 Glove Box and License Light Bulbs

These fit many models from the 1970s to 1990s—both short and long bulbs, as shown.

The long bulb is 1 and 3/4 inches long, and the short bulb is 1 and 1/2 inches long. These bulbs don't necessarily fit all models. Some applications require smaller bulbs, and please measure your bulbs before ordering this 6-pak.

$132.00

1990 to 1995 6 Cylinder Diesel Glow Plug Relay

For 126 chassis 350SD 350SDL, 124 Chassis 1995 E300D and 140 Chassis 300SD and S350 ONLY in those years

Special price only 6 available. New Aftermarket Glow Plug Relay for models and years listing. PLEASE NOTE: cover is not included. You will have to use that from your old relay. Easy install. No instructions included.

$129.50

Late 616 617 Diesel High Performance Glow Plug Relay

1981 to 1985 240D 300D 300CD 300TD 300SD - Faster smoother starts in COLD WEATHER!

Looking for better-staring performance? Are your glow system lights not coming on on your dash even after replacing the glow plugs? It it taking way too long for the glow light to go out ( it should only be on 5 to 10 seconds)?

126 right upper control arm
$69.75

126 Chassis Right (Passenger side) Front Suspension Upper Control Arm

Fits all W126 sedans and coupes 1981 to 1991

This is a common wear item on high mileage 126 chassis. It will start out as a clunking noise when you go over rough ground. When real bad it will be hard to get your car to track right down the road  (it will want to wander) and you will experience uneven and rapid tire wear.

$198.50

116 123 126 5 cylinder TURBO DIESEL Driveline Flex Disc Kit

For 300D, 300CD, 300TD and 300SD to 1985 with turbo charged engine. Two Discs with hardware included.

FITS THE FOLLOWING All 116, 123 and 126 chassis diesel cars with 5 cyl. turbo engines. This includes 1982 to 1985 300D, 1982 to 1985 300CD, 1981 to 1985 300TD and 1978 to 1980 300SD / 1981 to 1985 300SD. THIS IS AN IMPORTANT MERCEDESSOURCE MAINTENANCE ALERT

$54.50

All Chassis 1968 to 1991 Front Steering Idler Arm Repair Kit

Next to bad steering gear box this is number one cause of steering looseness

FITS THE FOLLOWING: All Mercedes Chassis 111 113 108 109 107 114 115 116 123 126 from 1968 to 1991 (not applicable for 201 or 124 chassis). This is a very common wear problem on most older Mercedes.

$38.95

Diesel Automatic Transmission VCV Vacuum Controls Testing Kit

All diesel Automatic Transmissions with Vacuum Modulator Fitted 1978 to 1993

This unique kit will allow you to hook up a 30 in HG vacuum gauge between your vacuum control shifting valve (VCV) and your transmission modulator to test the VCV for proper function and to tune it for peak shifting performance.

61x Diesel Automatic Transmission Modulating Pressure Test Kit
$75.50
Currently out of stock.

61x Diesel Automatic Transmission Modulator Pressure Test Kit

Updated 11/20/25 - Purchase revised kit with video instructions and speed adjusters listed below.

Applicable to 114 115 116 123 and 126 Chassis, years and models listed above. Troubleshooting an annoying shift problem must first start with the vacuum modulator.

Late Style Vacuum Pump Main Checkvalve
$99.50
Currently out of stock.

Late Style Vacuum Pump Main Checkvalve ( Check Valve )

NLA - no longer made

FITS THE FOLLOWING: ALL 123 and 126 chassis 240D, 300D, 300TD, 300CD, and 300SD 1980 to 1985 with later style vacuum pump (only one line coming out of top). In 1980, Mercedes changed the design of its diesel vacuum pumps.

$16.95

617 Turbo Diesel Air Cleaner Rubber Mount Heat Shields ( Set of 3 )

These can help prolong the lift of the rubber mounts under your air cleaner housing

These steel cupped heat shields go under the rubber mounts to help deflect heat and grease away. In most cases (unless your engine is severely shaking) they will prolong the life of the rubber mounts.

On Demand Video
$7.99

Troubleshooting Older Diesel Automatic Transmission Shift Problems - On Demand Video

Knowing where each component is located and what it does is the start of solving externally caused shift problems

I don't think there is any owner out there who has owned a 1978 to 1993 diesel automatic for any length of time and who has not had some sort of shift problem with the transmission. Maybe it was just a little jerk or a slipping shift. Maybe the rear end clunked hard when you came to a stop.

On Demand Video
Step-by-Step Diesel Purge Instructions - On Demand Video Instruction
$8.99

Purging a Diesel Engine Fuel Delivery System Step-by-Step - On Demand Video

How to use the best medicine for sick diesels to perform a proper diesel purge

Rough running diesels abound everywhere. The symptoms include poor acceleration, no power, and excess exhaust smoke. Some times these can be a sign of real problems. Other times it may mean your fuel injection system just needs a good cleaning. And NOTHING cleans better than Diesel Purge.

On Demand Video
Chasing Interior Water Leaks in Older Mercedes Benz - On Demand Video
$2.99

Part 1: Chasing Interior Water Leaks in Older Mercedes Benz - On Demand Video

Example of diagnosing a severe water leak in a W124 chassis wagon. Principles apply to many models.

Interior water leaks are very common. More so on the older 108, 116, 114, 115. 123, and 126 chassis than on the 201 and 124 chassis. This is largely due to the fact that the older models used rubber seals on the rear glass and on the front windshield (except the 126).

$69.75

Pressure Brake Bleeder

*Note: this pressure tank can now perform a cooling system pressure leak test as well . Kent's 2-in-1 invention. See below to purchase the pressure testing cap.

When used for bleeding or flushing your brake system, a single person can do a rapid fluid flush!  No mess and very efficient. Will work on all Mercedes from 1968 to 1995 - Also select 1960's models and most later chassis up to 2006 see list below: 25-minute video instructions are now included.

$3.80

30 Amp Strip Fuse 2 pak- High Amp Draw Components

Primary use for fans and heating units on late 126 and 107 , 201 and 124 Chassis

Yes, there may be a fuse inside or outside your fuse box that controls your heater blower motor or another high amp draw electrical component. Most of the separate fuse holders require a 30 amp fuse. You may find a funny looking bent fuse inside your fuse box.

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