Fuel leak 236 perkins around throttle arm

Anonymous-0

Well-known Member
Just noticed a little fuel leaking around throttle arm on my MF 180 with 236 perkins diesel. I looked on the parts diagram at agco, and can't see parts numbers for any gaskets. At least it looks like that is where it is coming from (top of fuel pump). Any suggestions as to what parts I might need? Many thanks, Daniel
 
Daniel, it is a pretty simple fix, but be careful and take you time. Here is an old post I done some time ago about this. Tom
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
 
Oilburner - I would love to see any pictures you
have. Was your experience like Tom's with the
springs? Any other potential pitfalls I should know
about before I get in over my head? Thanks for any
help. Daniel
 
You will need one Delphi # 7180 451 cover gasket, 2- 5339 970 stud gaskets and 4-5855 30 O rings to reseal the top cover. If you ever need to reseal the complete pump I have the parts and tools to do it for you if interested.
 
I followed Tom's instructions when I did mine. Clean, clean, clean is the key, and take your time. It's not hard and just requires a little patience and cleanliness. If I remember correctly the top cover requires very little torque. Be careful as you can snap of the studs very easily.

Here is a 4600 that I did- https://www.facebook.com/media/set/?set=a.187564881301591.47077.100001442426451&type=1&l=23c7ab910a

And here are the 180 pictures- https://www.facebook.com/media/set/?set=a.179447988779947.45194.100001442426451&type=1&l=a20e120c1a
 
Thanks for all of the help. Replaced the O rings the other day. Only idled at full throttle at first. Took the top off again and paid attention to make sure fuel pump shut off linkage was free, put it back together and it ran like a top. Thanks for all the input. After trying local diesel shops, finally called parts at MM Weaver in Leola, PA. Parts guy named all four O rings, two washers and gasket I would need before I could hardly say a thing. Parts arrived in mail a few days later. Excellent service.
 

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