MF165 Fuel Leak

[tg in VA]

I have a 165 diesel that is leaking (seeping) fuel where the throttle linkage fits in the top of the injector pump. Is there a seal that can be replaced or is this leak indemic of problems in the pump that will require a rebuild?

The fuel is not spraying, just seepong and dripping on the power steering reservoir.

 

[DH in Carolina]

Hello tg This is a common problem with cav injector pumps and is easy to repair. There is two o rings on the throttle shaft and two on the fuel shut off lever. The is a lot of discussion on this site on how to replace them. Do a search. The main thing is to get the outside of the pump very clean before you remove the top cover. Also there is a spring that you must put back in the same hole under the cover. DH

 

[DH in Carolina]

Check out Ebay item # 390149735223. This is what you need. DH

 

[Anonymous-0]

Is your pump a CAV? If it is a CAV, I have been there done that. The CAV is prone to leaking around the throttle shaft and the cut-off shaft. First you will need to get 2 or 3 cans of engine cleaner. Clean, clean, and clean again the whole area. After each spraying, hose off, let dry and do it again. Cleaner the better, if you drop a ball of grease/dirt into the top while the cover is off - big trouble, one piece of crud dropped into the bottom of the pump will cost you about $600-700. Now using a paper towel, start looking for your leak; it will show up real easy on the dry, clean paper towel.
1. MOST important thing is to have some paper and pencil BEFORE you take off the cover.
2. Remove shut-off linkage and throttle linkage.
3. Remove screws or nuts holding lid on.
4. DO NOT just lift up the top. Lift it just a little, very carefully so you can peek under it. A spring is attached from the lid to the bottom part of the pump. One end of spring is hooked on a wide post looking like a tombstone. The tombstone has several holes in it. Write down which hole the spring is hooked in before you remove it. The other end is through one of the holes in the flattened end of the control rod. Again write down the hole it is in before you remove it. This step is VERY IMPORTANT. If the spring is not reassembled to EXACTLY the same holes on both ends, the tractor will never run right again. The same pump can be used on different model tractors with the only difference being how the spring is hooked. My MF dealer mechanic can tell the proper holes by using the 3 numbers on the CAV. Now remove the spring, and lift off the lid.
5. Write down the model/year of tractor, and the model of the CAV pump and serial number. There are 3 different numbers on my CAV pump.
6. Take the cover with you and head to MF dealer and purchase a new gasket and four (4) tiny o-rings that fit around the throttle shaft and the shut-off shaft. Each shaft has 2 o-rings. If the o-rings are not leaking now, they soon will so replace all of them. Total cost of gasket and 4 o-rings is about $5 or $6.
7. You will need a little patience and two extra hands to get the spring attached on both ends and the new gasket fitted. I did this complete procedure on my MF 690 and now it has NO LEAKS.
Tom

 

[SK Super90]

Check out Tom TX"s instructions and follow them to the letter.

That"s how I fixed my leaking injector pump and I"ve had no problems since. Also, I;m a newb when it comes to the mechanical repair of tractors, so if I can do this repair anyone can!

Here"s a link to a couple photos I took whilst doing the repair - I hope you"ll find them useful:
Injector pump repair images

 

[tg in VA]

I'm back in business thanks to you guys.