Foton FT254 over-revving then no start

[greg_g]

As a general rule - short of changing lube oil - the Chinese fuel delivery assembly (usually referred to as the "injection pump") is not user serviceable. It typically consists of a lift pump, a hand primer, the governor, some screening and filtration, and the actual injector pump itself. And since the individual components are so inter-dependent, they're almost never sold individually. If any one fails, the whole assembly must be replaced. Unfortunately, they're not cheap - you're probably lookin' at somewhere in the neighborhood of $600(US).

//greg//

 

[Bob Rooks]

There is no solid mechanical link between the fuel injection pump rack and the governor. The rack is controlled by a spring and flyweights. Greg is correct - individual governor and fuel injection pump parts are not available on the retail market, and for good reason. Did you check to see if the fuel injection pump is even rotating?

 

[doxford jim]

There is no solid mechanical link between the fuel injection pump rack and the governor. The rack is controlled by a spring and flyweights. Greg is correct - individual governor and fuel injection pump parts are not available on the retail market, and for good reason. Did you check to see if the fuel injection pump is even rotating?

How about some original troubleshooting expertise Bob. All I seem to read from your postings are comments gleaned from a text book, periodicals or just plain negative criticism aimed at trying show how knowledgeable you think you are.

As a First Class Marine (retired Chief Engineer)engineer - with an unlimited licence that is good world wide, I find your constant emphasis on etreme conditions severely lacking in real world experiences.

It is obvious this man has very limited knowledge and is trying his best to get the problems sorted out. he has had absolutely no help from you - you are too busy trying to be a "smart arse".

Lets keep this subject and where it is going, to helping each other instead of doing what you are so prone to do.

To be honest, when I see comments like you make - I understand why you work /worked for a local ferry company.

You could take some lessons from what greg_g is doing and try to help.

Thank you

Jim (off his soapbox for now)

 

[Bob Rooks]

OK Jim.
I'm active full time (US Merchant Marine, also world-wide) Chief Limited Oceans, 2nd Motor Unlimited Any HP - Any Ocean (which probably trumps your Canadian license), Chief Gas Turbine Any HP - Any Ocean. Also Cat cert. master mech. (I know, they are a dime-a-dozen). I have rebuilt lots of governors, turbochargers, engines, and fuel injection pumps, and I have been witness to engines that have grenaded themselves from being repaired by competent mechanics. I try to leave nothing to chance by not encouraging inexperienced people to repair or troubleshoot something they know absolutely nothing about and have no understanding of the negative consequences. It is not in the best interest of anyone to learn that someone is laying dead with a piston rod through their head. And yes, some of my knowledge is from textbooks, etc., probably the same ones you used to pass your license exams. Also many, many years of "wrenchin'" and "makin' mistakes". And engineering school too.
There is something definitely wrong with the OP's fuel injection pump/governor assembly. At this point I would only advise the OP to remove the assembly and take it to a diesel shop where it can be tested and calibrated on a Bacharach stand, or purchase a new assembly altogether. I only interjected where I thought it necessary, and accept full responsibility for my advice. That said, I will crawl back under my rock (until I resurface again):laughing:

 

[Bob Rooks]

To be honest, when I see comments like you make - I understand why you work /worked for a local ferry company.

Well, I decided I wanted to take a huge pay cut, have a life, and was fed up with 6 months on, 1 month off. Actually, it's a real good job. Sure beats hanging a piston in a Sulzer in theSouth China Sea.:thumbsup:

 

[Diamondpilot]

Found the 21 mm open-ender in the Foton Toolbox. Undid one of the lines and didn't see a drop of fuel when cranking. Set the throttle to half way, and still nothing.

So now what?

Are you 100% sure you have fuel flowing from the tank to the pump thought the flexible line?

Chris

 

[FotonOwner]

Are you 100% sure you have fuel flowing from the tank to the pump thought the flexible line?

Chris

DP
As I said earlier I slackened off the ringed bleed screw on the side of the IP and as I cranked the engine fuel pumped out of the bleed point.
I assume there is no way that will happen without all the lines being fine.

 

[Rich Waugh]

The fuel coming out at that point is coming from the lift pump, not the injector pump. To check the IP itself you have to open an injector line where it connects to the injector itself and crank the engine long enough to bleed out all the air that is in the lines. May take half a minute or more of cranking so have the compression release clamped open to make it easier on the starter and battery. You have to do it with each of the injector lines generally - it will take at least two functioning injectors to fire the engine.

As Bob Rooks noted, you might want to check that the injector pump is actually turning when you crank the engine. If the drive gear/tang/whatever on the injector pump got damaged it would be good to know. Someone else will have to tell you how you check that without taking the pump off - I don't know. I do know that if you take the IP off the engine you'll likely have fits trying to get it back on in the correct "timing" to run properly, so you want to avoid removing it if possible.

Rich

 

[Smalljobs]

I agree with Rich. I'm no expert on this but it makes sense to verify if fuel is present at each injector when cranking.

 

[Bob Rooks]

Well, at the risk of offending someone, I have a couple more comments.
During the overspeed event you could have possibly seized plungers in their barrels and this would not allow them to follow the cam down so they cannot reprime - OR - there could be broken plunger return springs (which would have almost the same effect).
To check to see if the fuel injection pump is actually turning: Remove the big hex nut on the side of the lift pump (careful, it has a big spring behind it) and remove the spring. Inside you will see a push rod and plunger. Hold your finger on the push rod and have someone manually turn the engine over. The push rod will move in and out if all is well. Take all of the usual safety precautions please.
:thumbsup:

PS: I have a video of this procedure on CTOA/YouTube, but I can't get to it from where I am.