How a Diesel Governor Works

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.

[_pradyumnajoshi]

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!

[SiRicketts]

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.

[technicallymax]

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!

[Roam]

Bravo sir.
Also to add, the 4 fly weights I've found as you said keep the engine at a low rpm under load.

When removing 2 of the fly weights, allows the engine to work conventionally.

[kikungwegrace]

the best vedio and the best person who has taught me how a governer works. Am to watch our vedios also. your indeed a great teacher, i wish i can ever meet you for a beer.

[timmoles]

Thank you for the explanation that I should have had 30 years ago. Excellent.

[ianto]

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!

[Guyisadog]

You explained that so well. Fascinating! Thank you!

[sahibsahib]

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 ?

[stevencleary]

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?

[boatengsamuel]

This is a very great Video
God bless you Sir for sharing

[alimoghnieh]

Great video. I'm trying to troubleshoot an Onan 11.5 kw genset that running on (almost running away) at high rpm and the only thing shutting it off is shutting off the fuel at the manifold or blocking the intake. What do you think could be the cause of a genset running away and not be shutdown by the shutoff lever?

[davewhichello]

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.

[iRnline]

Hi, I hope it's okay to ask you this question because I can't seem to find any information about faulty governors online. We installed a completely overhauled volvo penta md11c in our sailboat, and although it's running it won't react well to the throttle. When increasing throttle, it will take a while for it to get up to speed. Sometimes, when under load, the RPM's won't increase at all until we press the cold start button, then it will respond to the throttle pretty well. After returning to idle, and increasing throttle, it will not increase RPM's, or will get up to speed very slowly.

The mechanic who did the overhaul says that it's because the engine needs some time to run before the governor will function properly. Something about the weights getting stuck and needing some time to settle. Could that be true? We've ran the engine for 3 hours now, changing speeds every minute or so, but not much has changed. I hope you can give some advice or peace of mind or advice!

[dimosdim]

Great video excellent!!! Short video and to the point.

[thetokerjokersmusic]

Great video! Best one I've found! Great little lesson

[bradroarktj]

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!

[hdfd]

Thank you so much. You save me a fortune

[ZahidAWMall]

Hi. This was very well explained by you. Thank you so much for this. So I have a question.
I have the same engine on my home generator. The RPM doesn't seem to be holding itself with variation in the output load. The voltage and frequency keep changing and my solar inverters keep disconnecting. Any suggestions? Are the fuel plungers weak?

[leicaguzel]

buradaki 3 silindir motor markası nedir..?