diesel engine governor

[F4Phantom]

I was hoping someone here knows about engine rpm governors in small truck diesel engines. I have a 3.5L TDI nissan in my RR. I find when I try to rev the engine hard it sort of cuts out as if its being starved of fuel. The car does not blow smoke when this happens. I think its either an engine problem or it has some sort of OEM governor attached which I have heard are on trucks to stop you killing them. My uncle had a mitsu canter from 1980 and when driving I remember he used to rev it till it hit the governor in every gear at all times and said thats how you drive these things.

Anyone familiar with light truck engines and how they are meant to be driven?

[JDNSW]

Almost all, if not all, diesel engines of any kind have a maximum speed governor. In quite a few cases this applies quite suddenly as soon as the maximum rpm is reached, and it is likely that this is what you are encountering.

John

[mcrover]

I havnt come across a diesel without a govner.

I cant give you specifics on your engine but generally the govner is set at the range which will give you maximum torque and power.

Not many diesels are built to rev due to the time it takes to ignite and burn diesel doesnt lend itself to reving hard, 3500 to 4000rpm is about the max for most until you start getting into the electronic controled etc etc.

I dont really agree with your uncle in how he drives his truck as i you always drive it to it's absolute max it will only last the minimum amount of time.

If you contact an injector repair company (I use Rankins diesels in Bayswater in vic) they will be able to tell you if it is set up correctly or if you can get a few more revs out of it by modifying the govener spring (set up) .

[F4Phantom]

thanks guys I will look into it. I dont want to rev the engine more than it needs but I do notice it could do with a little more in some gears.

[rovercare]

thanks guys I will look into it. I dont want to rev the engine more than it needs but I do notice it could do with a little more in some gears.

Then fit a Pyro and up the fuel;)

Its a governor that'll be stopping it in its tracks, fine to rev it to it, but wouldn;t do it every gear change, peak torque will be well below it

[Blknight.aus]

First up check and change all of your fuel and air filters, while thats being done check all of your fuel lines for blockages.

it can also be the throttle cable not pulling on the linkage far enough...

if its anything other than that its pretty much out of range of your average mechanic.

[F4Phantom]

First up check and change all of your fuel and air filters, while thats being done check all of your fuel lines for blockages.

it can also be the throttle cable not pulling on the linkage far enough...

if its anything other than that its pretty much out of range of your average mechanic.

Today I put in a new fuel filter, now I cannot get the car to go over about 70kph as its being starved of fuel. So the governor thing was way out, but before the filter change the car consistently hit revs and stopped so as to confuse the situation.

I have also noticed that the engine only cuts out when I am asking for torque from the engine not revs, so I floor it up a hill and it cuts out.

[rovercare]

You need to bleed the fuel lines now............or it'll eventually bleed itself:D

[F4Phantom]

You need to bleed the fuel lines now............or it'll eventually bleed itself:D

do I do that by cracking the injectors and pumping air out right before the engine or could there be some sort of eddy current air lock somewhere else?

[Blknight.aus]

there will be some special blanking bolts fitted in different places on the fuel system that will let you bleed it of air..

I bet there is a hidden banjo strainer somewhere (normally the lift pump) or the tank strainer is clogged and causing problems.

IT can still be a blocked line somewhere.

[rovercare]

do I do that by cracking the injectors and pumping air out right before the engine or could there be some sort of eddy current air lock somewhere else?

Yea, If its running just crack each injector line at a time, till it spews diesel everywhere:D

[F4Phantom]

guys thanks so far, I have also read about 10 other posts about very similar issues, Blknight basicly answering every one of them! (is there anything you dont know). I am having very similar issues to the isuzu 3.9 in power cutting out from no fuel, given that my engine is basicly the exact thing built by a competitor I think its the same prob.


So I will check the fuel pump at the tank and see if the filter is clogged and any leaks at joins, if worst comes to worst I will blow compressed air the reverse way through all the lines and see how this goes.

[F4Phantom]

Just a follow up to this thread. I blew out the fuel lines to fix this problem. One line seemed to have a non return/one way valve and I blew a lot of air into the tank, but the car now drives as it should, in 4th while accelerating up steep hills. Nice to be back and thanks for all the suggestions.

[JDNSW]

Thanks for posting results - if people don't do this, everyone who offered advice is left wondering what the problem was.

John