This easy-to-install kit could do wonders for your older diesel engine. The lift pump is almost always forgotten when it comes to maintenance on the OM616 and OM617 engines. If you are struggling with undiagnosed starting and power-related issues ( after adjusting the valves, checking compression, checking fuel injectors, and changing fuel filters ), repairing the pump that delivers fuel from the tank to the injection pump could possibly solve your problem. This is not a complete "overhaul kit." It will not fix internal pump wear or leaks. This is an internal check valve and copper washer replacement kit. If the check valves are not sealing, the pump pressure can be reduced, and you may experience difficult cold starts due to fuel "leak-back." Watch the video below as Kent explains more and shows what is involved in the job.
Product Details
Only the following are included:
- Genuine Mercedes check valves and springs and copper washers
- New lift pump to injection pump gasket
- Gasket sealant
- Three new locking nuts
- New primer pump copper sealing ring
- Razorblade to clean off the old gasket
- Video instructions by Kent
- Special short wrench
Here is the very short 10mm wrench now included. It is different from the one shown in the video as it is a full combination wrench. Kent found this after filming the video and discovered the box end is narrow enough that it can be used on some of the lift pump nuts. This makes this wrench the best bet for the job.
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We also recommend replacing the hand primer pump unless you have done that recently. If you want faster and smoother cold starts, easier bleeding, and more power under load, consider installing an electric fuel boost pump inline between the fuel tank and the injection pump on your old diesel. It takes the strain off the mechanical lift pump, which is always trying to suck fuel up to the engine from the tank. Other diesel manufacturers have done this! See related products below for our inexpensive and easy-to-install DIY kit.
Related Products:
OM616 OM617 Lift Pump Overhaul instructions - On Demand Video
If you are experiencing hard starting or unexplained loss of power, your engine's lift pump could be failing.
HD 90 Degree Diesel Clear Prefilters with Reinforced Screens - Set of (3)
These fit all 123, 116, and 126 chassis 616 and 617 diesels from 1977 to 1985. This includes 4 and 5 cylinder both non turbo and turbo engines.
1977 to 1995 Universal Diesel Performance Fuel Boost Pump Kit
This can be installed in your W116 W123 W126 W201 W124 diesel in 60 to 90 minutes. You will use the video instructions for installing it in a W123 (included), then you will make location modifications to fit your specific chassis.