Search | diesel valve adjustment

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On Demand Video
$14.99

Diesel VCV Valve Installation and Linkage Adjustment Instructions - On Demand Video

Applies to OM617 Turbo Diesels from 1978 to 1985 and OM616 and OM617 Non Turbo engines 1980 to 1983

In this 17 minute instructional video Kent will walk you through removing and installation a VCV valve off the back of the injection pump and the proper way to adjust the linkage travel for best performance.  A number of tips will be shared to reduce frustration and prevent problems.

PDF
$6.99

Diesel Valve Adjustment Procedures - PDF Download

Instructions for 1961 to 1985 4 and 5-cylinder diesels with an overhead camshaft - excluding the 1984 and 1985 190D

To read or download in a 2-up format. Kent will walk you through the steps of adjusting the valve clearances on your older 190D, 200D, 220D, 240D, 300D, 300CD, 300TD, and 300SD. This procedure should be done every 12,000 miles. Two special wrenches are required.

$3.75

615 616 617 Diesel Valve Cover Wave Washers x 8

All 200D 220D 240D 300D 300CD 300TD 300SD 1964 to 1985

These washers are installed right under the four nuts that hold the valve cover securely to the cylinder head. They help to prevent the over tightening of the valve cover as well as prevent the nut from loosening up. They also keep the nut from gouging the metal out of the valve cover.

300D 300CD 300TD 300SD Valve Cover Gasket Set
$42.50

5 Cyl. 617 Diesel Valve Cover Gasket Set of (3)

Fits 300D 300CD 300TD 300SD - Receive a Related Bonus-Product FREE!

Fits 115, 116, 123 and 126 5 cylinder diesel engines (both non-turbo and turbo) from 1975 to 1985. These should be changed every time you remove your valve cover for valve adjustment or other maintenance. Stock up now for a great price on a set of 3.

$39.50

1978 to 1985 Diesel VCV ( Vacuum Control Valve ) Internal Inspection and Service Kit

Poor shifting. Try fixing yours. The kit includes three detailed on-demand videos to remove, test, and service the VCV, which can be purchased separately below!

The VCV valve controls the critical shifting patterns of most diesel automatic transmissions from 1978 to 1985. This includes the 1978 to 1985 300SD, the 1980 to 1985 W123 300D, 300CD and 300TD and the 1980 to 1983 240D.

$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.

220D 240D 4 Cylinder Valve Cover Gasket Set
$37.50

220D 240D 4 Cylinder Valve Cover Gasket Set of (3)

For diesel 615 and 616 engines

Fits 110, 115 and 123 four cylinder diesel engines. These should be changed every time you remove your valve cover for valve adjustment or other maintenance. Stock up now for a good price on a set of 3.

When replacing your valve cover you may need wave washers. Look below.

Sale
$328.00

1980 to 1984 Diesel Transmission Vacuum Shifting Valve ( VCV ) -Refurbished

Low time. Very hard to find ones now that are even repairable. LAST ONE available. Critical for proper transmission shifts on 1980 to 1985 240D 300D 300CD 300TD - 1981 to 1985 300SD. Free video instructions included.

Not all units are repairable. These are no longer available new. This is one of the best we have seen in recent years.

$98.00

1981 to 1995 722.3 722.4 722.5 Transmission Vacuum Modulator Valve

Only black is currently available, but it will work in 722.3 and 722.4 transmissions. This is the easy-to-adjust upgraded version with the new style pin included.

9/2025 Update: Green and Red Modulators are NLA, and we have been informed that they will not be remanufactured. But, do not panic! You may have heard that you must replace your 1981 to 1995 transmission modulator with the correct color top.

$248.00

1981 to 1984 OM617 Turbo Diesel 3/2 Valve Cover Mounting Plate, Linkage and Valves - USED

ONLY ONE. Hard to find. Includes all items exactly as shown. Black plastic cover included. Multi pin plug and vacuum lines also included Study picture carefully before ordering.

This is a critical part of the throttle linkage and controls transmission shifting and EGR valve operation. These parts are often missing or have been all messed up. This will be a good start toward getting your vacuum system back in proper working order.

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.

61x Diesel Automatic Transmission Tuning Manual
$28.50

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.

$198.75

1970 to 1975 350 and 450 V8 Physical Exam Kit

D-Jet restoration Step !. You will need this to determine if your old V8 D-Jetronic fuel-injected engine is healthy internally.

This is the FIRST thing you should do on your D-Jet V8 engine. This is true when approaching fixing any older gasoline or diesel engine.  If you don't do this, you will be guessing and spending money forever trying to get the engine to run right! 

$239.00

4 Cylinder 220D 240D Physical Exam Kit - Check Engine Health

You can save thousands $$ by doing this yourself and catching problems early.

If you are going to buy or have just purchased an older 4 cylinder Mercedes Diesel the first thing you need to do is a good physical exam of the engine. It is even better to do this BEFORE you purchase the car to prevent surprises and pain in your wallet.

$259.00

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.

$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.

$96.50

1977 to 1985 Diesel Engine Critical Coolant Service Kit

So often neglected - yet critical to preventing pre-mature or catastrophic engine failure!

Why is this so important? It is primarily due to the age of these cars now and the fact that lurking problems can be hidden from visual inspection. There is not ONE diesel that Kent has looked at in the last five years that does not need this service! Even ones with under 150,000 original miles.

$68.00
Currently out of stock.

1981 to 1985 Turbo Diesel Modulation Pressure Test Kit

11/25 Update - now upgraded to new kit with video instructions. See related products below to order

PLEASE ORDER THE UPGRADED KIT BELOW for your 1981 to 1985 turbo diesel  Mercedes.

Sale
$32.50

Full 12-Part Transmission Video Class - How to Overhaul the 722.3 and 722.4 Transmissions - On Demand Video Series

5 hours in length. Read what is covered below. Covers most 1981 to 1995 automatic transmissions.

This is Kent's full class on overhauling these old transmissions. They all need help now, not because they are mechanically worn out, but rather because all the old rubber lip seals and O-rings are hard and worn out. They all need resealing!  Valve body overhaul is NOT covered in this series.

$158.75

M117 V8 Timing Chain and Upper Guide Rail (3) Replacement Kit with Instructions

Prevents Catastrophic failures on 4.5, 5.0, 5.6 liter V8 engines from 1972 to 1991. NOTE: Oil tube clips and valve cover gaskets available separately

PLEASE NOTE: Manual(s) are now available in PDF format and are available for viewing when you log into your account at Mercedessource. No printed manuals are shipped.  If you own a Mercedes with the M117 V8 engine timing chain failure can really ruin your day!

$14.80

Early V8 and Diesel Engine Rotation Socket and Extension

27mm six point socket with 3" extension just the right length to fit into the front pulleys and clear the radiator on most early 6 clyinder, small V8 and diesel engines from the early 1960's up to 1985

For a number of maintenance operations, you need to be able to turn the engine over by hand. This includes valve adjustment, timing chain replacement, injection pump timing on diesel engines, checking and setting internal engine timing, draining the torque converter, and others.

$2.95

123 107 126 201 124 722.3x and 722.4x Transmission Modulator O-ring Seal

For re-sealing green and black modulators on most 1981 to 1993 models.

If your modulator is working ok, but leaking transmission fluid, you may only need to replace the inexpensive oring ( o ring ). You do have to be careful when removing the modulator from the transmission. For instructions (available separately) see related products below.

On Demand Video
$9.99

Early V8 Engine Compression Test Procedures - On Demand Video

30 minute Instructions apply all M116 and M117 engines from 1970 to 1991. Principles also apply to 4 and 6 cylinder gas engines during that same period.

This video will walk you step-by-step through the proper procedures for doing a full compression test on your older V8 Mercedes Engine.

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.

$79.50

M116 V8 Timing Chain Upper Guide Rail Replacement Kit

Save your V8 regardless of mileage - DO this job if it has not been done in the last 15 years.

For all 3.5, 3.8, and 4.2 liter V8 engines from 1969 to 1991 280SE 3.5, 300SEL 3.5, 380SE, 380SEC, 380SEL, 380SL and 420SEL. These THREE are the upper (and easily accessible) plastic guide rails that most often break due to age and heat.

$85.00

M117 V8 Timing Chain Upper Guide Rail Replacement Kit

Save your engine regardless of mileage if this job has not been done in the last 15 years

PLEASE NOTE: Manual(s) are now available in PDF format and are available for viewing when you log into your account at Mercedessource.

$39.50

Engine Crank Rotation Adjustable Length 1/2 Inch Drive Ratchet Wrench

Rotate Engines on 220D 240D 300D 300CD 300TD 300SD 300SDL and all V8's from 1970 to 1991 - Extends to 18 inches long!

This is Kents new favorite ratchet wrench for turning engines over during service and repair. There are a number of maintenance procedures that require you rotate the engine over by hand.

$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.