In this video I show and explain how a typical governor works on a diesel engine. This video covers small auxiliary diesel engine which have inline fuel pumps.
First proper video that explains how throttle AND governor work. All the other videos that I have come across, explain only the working of the governor, but not the throttle. Keep up the good work!
Brilliant video, thanks for posting! I have a Perkins 103. 07 engine which is running at high revs and this video has just explained why it must be high revving only, thank you Sir!
Thanks Ted, bang on the money, I have a specific problem with a Volvo MD2010 that has been standing for 11 years and when started wants to run away every time and needs to have the air intake blocked to stop it. I’ve asked a number of marine engineers what the problem is and they have said stuck governor so this video has filled in the missing info to allow me to remove the timing case and investigate. Excellent and thanks again.
Hey man great video you really know what your talking about!what has to be changed to make it varible speed vs limiting speed like a welder has,trying to put a welder engine in a skidsteer and I bet your the man that knows what I need to do!
Many gensets have the governor preset to 1800rpm with a small adjustment on the pump to set the rpm to 60 Hz. This is something I have not done but am sure you Need a different injection pump and governor arrangement.
@@tedsmarinerepair8956 it's a cat 3024c the little perkins engine,i can't find any information on the swap,I'm just curious what actually limits the speed in the 1800 rpm engines
Hi sir, i bought brand new Johndeer 4045 engine and fixed it with ganerator, problem is the rpm/hertz go down when the power increase , what should i do yo make the pump governor work right ?
Thanks for sharing this video. I have a VP 2010 with a new injection pump fitted last year. Winterised the engine and have been getting it ready for the new season. I have lifted the pump off because I have no throttle movement at the pump and the engine will only idle. The external throttle lever is free and I have spring resistance from the large spring. I get movement from the fuel stop lever at th4 pump.. Before I remove the engine from the boat, can you think of anything obvious I am missing? Many thanks in advance of any help you can offer. Dave I the UK.
Ted, great video...thanks so much for sharing this info. I realize this is 2yrs old at this point, but I have a question for you. I read through all the comments to see if anyone else asked my question, I don't see anything similar. I'm working on a problem on a boat I'm purchasing. It's a Yanmar 4JHE in an old 40' sailboat. The problem is that under load RPMs are 1700 below where they should be (engine is rated for 3600 WOT, we got 1900 during the sea trial). We thought it might be a problem with the prop pitch (feathering Maxprop), so I checked the pitch on the prop and it was wrong...but not wrong enough to account for the RPM difference. We corrected the prop and got another 300 RPMs or so, but still well below where the engine should be (now at 2200 with properly pitched prop, but should get to 3600 WOT). With no load, the engine actually revs a bit above where it should (we hit 3900). Question- you mentioned several times in this video how the forces work against each other in a 'no load' situation with the governor. Is there a separate mechanism or adjustment for 'under load' governing? I know in some trucks, there is a governor to limit speed...so shifting up through the gears you get full RPM, but when you hit 65mph the governor kicks in and no matter how far you put the petal to the floor, no more fuel. That is how this boat is behaving, as if there is a governor limiting the under load RPMs. The current owner of the boat is an elderly man, and he recalls he may have asked a prior shop to 'set a governor' when he started letting his grandchildren use the boat. This actually makes sense because there is no telltale sign of over fueling when the engine won't come up to appropriate RPM. In fact, when we get to 2200 and then give more throttle there is no change of any kind (no smoke, no sound difference, it's as if the cable moves but the engine doesn't get the signal to increase RPMs). We considered a fuel delivery problem, but I would think that would show other symptoms (without a load, hesitation, fluctuation, etc.) Any ideas?
The fuel injection pump may have had an adjustment done to limit the fuel delivery but not something I would suspect a dealer would be willing to do. With the engine off move the throttle to full and then go remove it from the pump to see there is more movement you can get out of the pump (cable issue if so). Also if it is starving for fuel it will act just like a limited throttle range. try running it on a external fuel tank like a 5 gallon diesel jug to see if it make power.
I've got a c1.5 used on a morbark wood chipper. Engine runs at low rpm, throttle doesn't seem to increase rpm. I have taken it apart and can't seem to understand what the problem is. If I stick a screw driver through the oil fill and push the fuel linkage arm the engine rpm's increase just fine.
HI Ted, Brilliant Video. I am looking to get a SR2 engine and had heard the governor being mentioned a lot, but had no idea of its working function. Now after watching your video I have a better understanding of how they work and their principles. Can you answer some queries I have, Please?. I intend to run the SR2 at around 1000 to 1200 rpm under load(approx 78nm). How would I achieve this?. By turning the throttle lever screw out, to hold it at the desired RPM?. Or would I need to get special governor weights to achieve this correctly?. Many Thanks, Leon. :-)
If it is a variable speed engine (propulsion or a variable speed generator) you can set the rpm where you want via throttle linkage. If it is a true one speed generator 1800 or 3600 rpm) then you may have trouble getting it to run at that speed without modifications.
Its a similar set up to a honda close (predator 212) governor and if you removed that you can get more RPM and in turn more power would it be the same for if i did that for say a kubota 3 cylinder diesel and removed the governor? More fuel and put more air and more power?
Due these are marine engines and under 100% load all the time, it is not advisable to mess with the governor. That would ultimately lead to early engine failure.
Yes it will increase the output HP of the engine, but again in doing so this increases the stress that the engine is not designed for - and yes we used to do that as kids with our riding tractors and minibikes too!@@gokartsminibikesandmore9925
Great video cleared many of my confusions about this assembly of governor springs. But i have a question sir, i have an alternator coupled with one of these engines but that would retain the rpm on load instead drops many rpm on load. Please do guide me on this.
I'm not exactly sure what your asking . However, if it is a diesel engine and it's losing rpm when a load is applied, use an amp clamp to determine if the load is greater than the gen set capacity. If the load is not excessive it is likely a fuel delivery problem.
It is a very comprehensive video on how a deisiel engine governor works no wonder the best over the youtube. Sir there are a couple of bolts inserted right into the body just side to the pump housing on left side, what is the function of them, i am sure they are, since they are inserted into the governor assebly housing i cant seem to know or find out thier function anywhere? If you could provide me your emil address i cam show you. That would be highly appreciated.
Do you mean when there is a large DC load applied and the alternator has to put out maximum current? If so, is it a high output alternator - not the stock one?
It sounds like your talking about a fixed rpm engine (diesel generator). In those the governor will add fuel as load increased to carry the load. If you wanted to chang it to variable speed you need a different pump/governor design.
What causes a small engine just like that Kubota to be difficult to start unless you give it half throttle before starting engine is an exceptional shape it is not worn out or smoking or blow-by or any of that stuff just has to have half throttle to start easily
See I'm having a problem with my diesel engine. It can barely idle without me holding it towards the run position. I think I just found my problem or at least understand it a bit more now. Thank you
I have heard the a two stroke / cycle diesel can ‘run’ backwards therefore negating the governor and therefore over speed the engine. Is that correct? Methinks not.
The fuel injection would be at the wrong time if cranked in reverse so no it would not run. The governor flyweights would still make the governor functional as well.
If the centrifugal governor isn’t working properly can this cause runaway? I have a deutz diesel which starts reving uncontrollably. Unsure what the problem is
That is very possibly the cause. I would inspect the throttle linkage to ensure the cable is moving the fuel injection pump lever back to the idle position
Ok, the deutz engines don’t have one pump but rather individual pumps per injector that run off a cam shaft. I’m a little confused how the throttle and governor work with a system like this. I guess I’ll pull everything apart
@CMF917 on one end of the engine will be the governor assy. Likely in the front where the gear drive is. There will be a control rod that connects all the pump fuel levers together. That rod connects to the governor and throttle lever. I would start at where the throttle cable attaches to the engine. The governor may have a broken return spring. An exploded parts diagram will help.
@@tedsmarinerepair8956 thanks can you please briefly tell about function of 'Gearbox'? I got confused after heard from someone that gearbox also for making engine speed constant.
@@farhanfaizal129 In the US the term Gearbox is also known as the "reverse gear" which are marine terms for a marine transmission (inboard engines). On old mechanical diesel engines they may have a RPM gear in the "gearbox" which drives a mechanical cable that is attached to the tachometer (RPM gauge) and possibly an engine synchronizer for twin engines.
First proper video that explains how throttle AND governor work. All the other videos that I have come across, explain only the working of the governor, but not the throttle. Keep up the good work!
@132_pradyumnajoshi8 thank you for the positive feedback!
You explained that so well. Fascinating! Thank you!
This is a great little video for understanding what a governor is and what it does. Great video, as a visual learner it helped a lot!
Thank you for the positive feedback. Trying to get the info out there!
Thank you for the explanation that I should have had 30 years ago. Excellent.
Brilliant video, thanks for posting! I have a Perkins 103. 07 engine which is running at high revs and this video has just explained why it must be high revving only, thank you Sir!
Thanks Ted, bang on the money, I have a specific problem with a Volvo MD2010 that has been standing for 11 years and when started wants to run away every time and needs to have the air intake blocked to stop it. I’ve asked a number of marine engineers what the problem is and they have said stuck governor so this video has filled in the missing info to allow me to remove the timing case and investigate. Excellent and thanks again.
Great video! Best one I've found! Great little lesson
Thank you for the feedback!
Great video excellent!!! Short video and to the point.
Excellent explanation.
Amazing video....thank you!
Thank you for the great Feedback, always looking to incorporate better info into my channel. Tell you friends to subscribe!
Thank you so much. You save me a fortune
This is a very great Video
God bless you Sir for sharing
You are very welcome! Thank you for the positive feedback!
Great explanation 👌 thank you
Thank you sir great explanation
Great explanation
Great video
Very good video
Hey man great video you really know what your talking about!what has to be changed to make it varible speed vs limiting speed like a welder has,trying to put a welder engine in a skidsteer and I bet your the man that knows what I need to do!
Many gensets have the governor preset to 1800rpm with a small adjustment on the pump to set the rpm to 60 Hz. This is something I have not done but am sure you Need a different injection pump and governor arrangement.
@@tedsmarinerepair8956 it's a cat 3024c the little perkins engine,i can't find any information on the swap,I'm just curious what actually limits the speed in the 1800 rpm engines
quality content🧠
Thank you for the positive feedback!
Very nice sar exsplen
Hi sir, i bought brand new Johndeer 4045 engine and fixed it with ganerator, problem is the rpm/hertz go down when the power increase , what should i do yo make the pump governor work right ?
Thanks for sharing this video. I have a VP 2010 with a new injection pump fitted last year. Winterised the engine and have been getting it ready for the new season. I have lifted the pump off because I have no throttle movement at the pump and the engine will only idle. The external throttle lever is free and I have spring resistance from the large spring. I get movement from the fuel stop lever at th4 pump.. Before I remove the engine from the boat, can you think of anything obvious I am missing?
Many thanks in advance of any help you can offer.
Dave I the UK.
Love you
Ted, great video...thanks so much for sharing this info. I realize this is 2yrs old at this point, but I have a question for you.
I read through all the comments to see if anyone else asked my question, I don't see anything similar.
I'm working on a problem on a boat I'm purchasing. It's a Yanmar 4JHE in an old 40' sailboat. The problem is that under load RPMs are 1700 below where they should be (engine is rated for 3600 WOT, we got 1900 during the sea trial). We thought it might be a problem with the prop pitch (feathering Maxprop), so I checked the pitch on the prop and it was wrong...but not wrong enough to account for the RPM difference. We corrected the prop and got another 300 RPMs or so, but still well below where the engine should be (now at 2200 with properly pitched prop, but should get to 3600 WOT). With no load, the engine actually revs a bit above where it should (we hit 3900).
Question- you mentioned several times in this video how the forces work against each other in a 'no load' situation with the governor. Is there a separate mechanism or adjustment for 'under load' governing? I know in some trucks, there is a governor to limit speed...so shifting up through the gears you get full RPM, but when you hit 65mph the governor kicks in and no matter how far you put the petal to the floor, no more fuel. That is how this boat is behaving, as if there is a governor limiting the under load RPMs.
The current owner of the boat is an elderly man, and he recalls he may have asked a prior shop to 'set a governor' when he started letting his grandchildren use the boat. This actually makes sense because there is no telltale sign of over fueling when the engine won't come up to appropriate RPM. In fact, when we get to 2200 and then give more throttle there is no change of any kind (no smoke, no sound difference, it's as if the cable moves but the engine doesn't get the signal to increase RPMs). We considered a fuel delivery problem, but I would think that would show other symptoms (without a load, hesitation, fluctuation, etc.)
Any ideas?
The fuel injection pump may have had an adjustment done to limit the fuel delivery but not something I would suspect a dealer would be willing to do.
With the engine off move the throttle to full and then go remove it from the pump to see there is more movement you can get out of the pump (cable issue if so).
Also if it is starving for fuel it will act just like a limited throttle range. try running it on a external fuel tank like a 5 gallon diesel jug to see if it make power.
I've got a c1.5 used on a morbark wood chipper. Engine runs at low rpm, throttle doesn't seem to increase rpm. I have taken it apart and can't seem to understand what the problem is. If I stick a screw driver through the oil fill and push the fuel linkage arm the engine rpm's increase just fine.
HI Ted, Brilliant Video. I am looking to get a SR2 engine and had heard the governor being mentioned a lot, but had no idea of its working function. Now after watching your video I have a better understanding of how they work and their principles. Can you answer some queries I have, Please?. I intend to run the SR2 at around 1000 to 1200 rpm under load(approx 78nm). How would I achieve this?. By turning the throttle lever screw out, to hold it at the desired RPM?. Or would I need to get special governor weights to achieve this correctly?. Many Thanks, Leon. :-)
If it is a variable speed engine (propulsion or a variable speed generator) you can set the rpm where you want via throttle linkage. If it is a true one speed generator 1800 or 3600 rpm) then you may have trouble getting it to run at that speed without modifications.
Its a similar set up to a honda close (predator 212) governor and if you removed that you can get more RPM and in turn more power would it be the same for if i did that for say a kubota 3 cylinder diesel and removed the governor? More fuel and put more air and more power?
Due these are marine engines and under 100% load all the time, it is not advisable to mess with the governor. That would ultimately lead to early engine failure.
@@tedsmarinerepair8956 what about hypothetically it was in a motorcycle or of the likeness
Yes it will increase the output HP of the engine, but again in doing so this increases the stress that the engine is not designed for - and yes we used to do that as kids with our riding tractors and minibikes too!@@gokartsminibikesandmore9925
Great video cleared many of my confusions about this assembly of governor springs. But i have a question sir, i have an alternator coupled with one of these engines but that would retain the rpm on load instead drops many rpm on load. Please do guide me on this.
I'm not exactly sure what your asking . However, if it is a diesel engine and it's losing rpm when a load is applied, use an amp clamp to determine if the load is greater than the gen set capacity. If the load is not excessive it is likely a fuel delivery problem.
It is a very comprehensive video on how a deisiel engine governor works no wonder the best over the youtube. Sir there are a couple of bolts inserted right into the body just side to the pump housing on left side, what is the function of them, i am sure they are, since they are inserted into the governor assebly housing i cant seem to know or find out thier function anywhere? If you could provide me your emil address i cam show you. That would be highly appreciated.
Do you mean when there is a large DC load applied and the alternator has to put out maximum current?
If so, is it a high output alternator - not the stock one?
how do you change if your motor has a "one speed position"? and you want it to react to a payload.
It sounds like your talking about a fixed rpm engine (diesel generator).
In those the governor will add fuel as load increased to carry the load. If you wanted to chang it to variable speed you need a different pump/governor design.
Would governor work if rack is stuck?
It would essentially do nothing if the rack is frozen. It's mechanical properties are to maintain rpm by moving the fuel rack.
What causes a small engine just like that Kubota to be difficult to start unless you give it half throttle before starting engine is an exceptional shape it is not worn out or smoking or blow-by or any of that stuff just has to have half throttle to start easily
Will it carry a full load at rated rpm?
@@tedsmarinerepair8956 engine is perfect in all aspects except for starting needs about half throttle no other issues of any kind Kubota v2203 e
@@tedsmarinerepair8956 no oil usage no injector knocking or nailing nothing
@tonydiesel3444 tiny amount of air entering the suction side will do it. Check all connections from tank to lp pump
@@tedsmarinerepair8956 it has all new lines new filters even a clear one on the suction side
See I'm having a problem with my diesel engine. It can barely idle without me holding it towards the run position. I think I just found my problem or at least understand it a bit more now. Thank you
I have heard the a two stroke / cycle diesel can ‘run’ backwards therefore negating the governor and therefore over speed the engine. Is that correct? Methinks not.
The fuel injection would be at the wrong time if cranked in reverse so no it would not run. The governor flyweights would still make the governor functional as well.
If the centrifugal governor isn’t working properly can this cause runaway? I have a deutz diesel which starts reving uncontrollably. Unsure what the problem is
That is very possibly the cause. I would inspect the throttle linkage to ensure the cable is moving the fuel injection pump lever back to the idle position
Ok, the deutz engines don’t have one pump but rather individual pumps per injector that run off a cam shaft. I’m a little confused how the throttle and governor work with a system like this. I guess I’ll pull everything apart
@CMF917 on one end of the engine will be the governor assy. Likely in the front where the gear drive is. There will be a control rod that connects all the pump fuel levers together. That rod connects to the governor and throttle lever. I would start at where the throttle cable attaches to the engine. The governor may have a broken return spring. An exploded parts diagram will help.
Thanks sir for the info and getting back to me
Hi Thanks for the informative vedio. Can i know the diffrence in purpose of Governer and Gearbox of Marine Engine?
Governors maintain engine rpm during load changes during engine operation. So if the load increases, the Governor increases engine output power.
@@tedsmarinerepair8956 thanks can you please briefly tell about function of 'Gearbox'? I got confused after heard from someone that gearbox also for making engine speed constant.
@@farhanfaizal129 In the US the term Gearbox is also known as the "reverse gear" which are marine terms for a marine transmission (inboard engines).
On old mechanical diesel engines they may have a RPM gear in the "gearbox" which drives a mechanical cable that is attached to the tachometer (RPM gauge) and possibly an engine synchronizer for twin engines.
@@tedsmarinerepair8956 thanks😊
Hello sir, whats the cause of engine hunting on these engines at idle, is the governor spring the reason?
Yes is a likely cause.
@@tedsmarinerepair8956 shell i shorten the original spring to increase its tension or intall another stiffer spring?
@@musavirkhan9795 order a new spring
Isuzu 4le1 generator 20kva 52Hz went load 50% drop in 46Hz！
Fuel pump and injector repair already！ What should I do the next ？
Check and ensure the air intake is clear. Check boost pressure. Could be a dragging turbo. Also Check for excessive exhaust back pressure.