Loud rotational bang but NOT a spun bearing..(i dont think)

kornbred95

New User
So I'm working on a Massey Ferguson 135 with the Perkins diesel and the tractor used to run great before it went down but I've since started working on it and I have discovered a very loud bang of course I thought it might have spun a rod or broke a piston but this is a much louder harder bang than the knock we're all used to hearing when one spins a bearing and it seems like it's coming from the back of the engine possibly the transmission/ transfer case? And of course since I've started back to working on it the injection pump went bad so I ordered a rebuild kit for the pump but wasn't certain if I could even rebuild it because it seems rather complicated nevertheless I figured why not give it a try since the rebuild kit was less than 15 bucks LOL What sucks is the tractor ran great a few years ago but from the time it went down to now somehow or another something happened to which I have no earthly clue as to why it's making this noise but am stumped nonetheless. Normally I would just run to Dad because boy could he work on a diesel LOL unfortunately that's no longer an option because he's no longer with us as to why it's more important than ever to get it back up and running sorry for such a long post but I have no where else to turn and would be absolutely grateful beyond words if someone could help me to figure this out. Hopefully I can upload a video or sound bite in the next couple days in hopes of someone possibly being able to help me diag this Massey especially since it would be a big help to take care of Dad's place. Again for anyone that actually reads this I think you in advance for your time and effort. Mike.. (KornBred)
 
Maybe something in the clutch let go. That's what happened to one of ours, clutch released finger pivot let go. Does it still run, move forward and back ok?
 
Is this a 1-time occurrence? Detail frequency and circumstances please, otherwise we must guess.
If you plan to DIY the injection pump rebuild, you'll need the service manual or detailed instructions. If you get the inj. pump out of time you have a job ahead. If the engine runs OK, forget about the pump rebuild and concentrate on the "loud bang".
 
I gratefully appreciate your responses to answer the first question from MKinON the tractor doesn't run as of right now but a couple years ago when it did run yes in fact I'm the one that drove it one of the last times it was running and yes sir it had its forward gears as well as the gearbox seem to be working fine but the other day whenever I was out there messing around with it I pressed the clutch pedal and I could swear I heard that loud bang it was just that one time because I tried my best to reproduce that sound but failed to do so. As far as rebuilding the pump is concerned I may put that on the back burner for now to focus on the loud bang I just was thinking I should try and get it running on its own in order to try and diag as to where that bang is coming from. I know this is going to sound stupid because it's a diesel and they require incredible fuel pressure to run but would it be possible to get it running just for like a minute so I would be able to record what it's doing? In other words if I hooked up an alternate fuel pump feeding the injectors? The reason I ask is if I was able to get it running if not just for 25 or 30 seconds I could have the wife on standby and record exactly the noise it's making. Something I just remembered the last time I was working on it and discovered the injection pump had gone bad however I noticed the arm on the back of the tractor was moving on its own so I believe the PTO is still in good working order. I'm terribly sorry to bombard you guys with a short fairy tale LOL but I'm trying to be as thorough as I can. Again I really do appreciate the input.
 
I gratefully appreciate your responses to answer the first question from MKinON the tractor doesn't run as of right now but a couple years ago when it did run yes in fact I'm the one that drove it one of the last times it was running and yes sir it had its forward gears as well as the gearbox seem to be working fine but the other day whenever I was out there messing around with it I pressed the clutch pedal and I could swear I heard that loud bang it was just that one time because I tried my best to reproduce that sound but failed to do so. As far as rebuilding the pump is concerned I may put that on the back burner for now to focus on the loud bang I just was thinking I should try and get it running on its own in order to try and diag as to where that bang is coming from. I know this is going to sound stupid because it's a diesel and they require incredible fuel pressure to run but would it be possible to get it running just for like a minute so I would be able to record what it's doing? In other words if I hooked up an alternate fuel pump feeding the injectors? The reason I ask is if I was able to get it running if not just for 25 or 30 seconds I could have the wife on standby and record exactly the noise it's making. Something I just remembered the last time I was working on it and discovered the injection pump had gone bad however I noticed the arm on the back of the tractor was moving on its own so I believe the PTO is still in good working order. I'm terribly sorry to bombard you guys with a short fairy tale LOL but I'm trying to be as thorough as I can. Again I really do appreciate the input.
You can't just hook up a different pump. The injection pump not only delivers the correct amount and pressure of fuel; it controls timing of the delivery and governing engine speed. You would need the same model injection pump to replace it.
 
I gratefully appreciate your responses to answer the first question from MKinON the tractor doesn't run as of right now but a couple years ago when it did run yes in fact I'm the one that drove it one of the last times it was running and yes sir it had its forward gears as well as the gearbox seem to be working fine but the other day whenever I was out there messing around with it I pressed the clutch pedal and I could swear I heard that loud bang it was just that one time because I tried my best to reproduce that sound but failed to do so. As far as rebuilding the pump is concerned I may put that on the back burner for now to focus on the loud bang I just was thinking I should try and get it running on its own in order to try and diag as to where that bang is coming from. I know this is going to sound stupid because it's a diesel and they require incredible fuel pressure to run but would it be possible to get it running just for like a minute so I would be able to record what it's doing? In other words if I hooked up an alternate fuel pump feeding the injectors? The reason I ask is if I was able to get it running if not just for 25 or 30 seconds I could have the wife on standby and record exactly the noise it's making. Something I just remembered the last time I was working on it and discovered the injection pump had gone bad however I noticed the arm on the back of the tractor was moving on its own so I believe the PTO is still in good working order. I'm terribly sorry to bombard you guys with a short fairy tale LOL but I'm trying to be as thorough as I can. Again I really do appreciate the input.
What makes you think the fuel pump is bad? That bang could've been any number of things and unlikely it was the fuel pump. First things first. Don't panic and don't jump to conclusions. Try turning it over by hand and see if it turns. Check transmission goes into neutral. Take cover plate off bottom of bell housing and have a look up at the clutch to see if everything looks ok or not. Take the starter out and see that the drive is ok. Then, try the key and see if it rolls over fine on the starter and makes any odd sound, or not. Sounds like you're too unsure about your abilities to tear into the fuel pump if it is indeed bad, so find someone who has the ability, as well as the specialized tools. Be faster and more sure in the long run. If you're determined, google Bundy Bears Shed and check out his videos on doing it. If you get the engine running, it's great that the PTO will work, one less thing to repair. However, if your foot was depressing the clutch pedal while trying to start it, it means the clutch plate is rusted to the flywheel face and not releasing. That is quite likely on a tractor sitting unused so long. Don't rush. Take your time and come back with what you find.
 
From your description in post #1 & #4, it sounds like the clutch pressure plate was stuck from non-use.
 

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