Jcb 801.4 perkins 100.30

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Jcb 801.4 perkins 100.30

Post #1 by Nathanrogerbailey » Wed Feb 22, 2017 7:09 pm

I have a jcb 801.4 with a perkins engine 100.30

I am unable to get it to start.

Engine turns over fine.

Can get fuel to the fuel injector pump but just dribbles out from there.

I would expect this to shoot out....?

Stop Solinoid works. And have even tried with it out.

Am i looking at a new pump or could it be an air blockage? If so how do I get rid of this?
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Re: Jcb 801.4 perkins 100.30

Post #2 by Jeremy Rowland » Wed Feb 22, 2017 9:41 pm

Hi Nathan welcome to CMN :wave: you could be sucking air into the system so first check that the fuel supply to the injection pump is good; next open the injector fuel pipes at the injectors and see if fuel dribbles out there okay, as the fuel comes through then tighten the pipe connectors and it should be bled to the injectors, technically it should fire up okay.
Did the engine just stop of its own accord or how did you get into this situation in the first instance?

With the more modern engines I am not sure if this model is fitted with computerised emission controls or not or if your engine as a MAF sensor as this could also give grief?

Jeremy


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Re: Jcb 801.4 perkins 100.30

Post #3 by Nathanrogerbailey » Wed Feb 22, 2017 10:29 pm

1 of the fuel hoses seems to be weeping fuel. This isnthe hose after the fuel pump to a hand pump and into the 2nd filter so will change that.

Its always been a pain to start. A lot of turn the engine over. Then started to loose power under load. Been sat still for a year..

No computers on this. Its as basic as they come. 1996 is the build year. 100.30 perkins engine.

When you say bleed the injectors. Do i need to undo those 3 screws and crack them off? Or will that effect the timing?


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Re: Jcb 801.4 perkins 100.30

Post #4 by essexpete » Wed Feb 22, 2017 10:37 pm

Is the engine pre heat working? I know it has not be particularly cold but it may need some initial heat.

Ah apologies I see you are not really getting fuel to the injectors. Have you any inline filters?

Did the engine suddenly do this or has it been getting more difficult over time?


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Re: Jcb 801.4 perkins 100.30

Post #5 by essexpete » Wed Feb 22, 2017 10:41 pm

No Jeremy means slack off a union at the injector.


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Re: Jcb 801.4 perkins 100.30

Post #6 by Nathanrogerbailey » Wed Feb 22, 2017 11:03 pm

Glow plugs work. Removed them and attached to battery
They get red hot. And when in engine checked with volte meter and get 12v.

Engine has always been a pain to start. But go to the point where only easy start would get it going. Now cant even get smoke from exhaust.

With bleeding. Out of the fuel injector pump i am only getting a dribble when cranking the engine. Would you expect them to fire the fuel out??

So i reattach pipework to injector fuel pump and loosen off at the actual injectors/atomisers then and just keep turning till i see fuel come out? I will give this a try along with replacing weeping fuel pipe. However will it actually get fuel up the pipe work if its only dribbling out of fuel injector pump


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Re: Jcb 801.4 perkins 100.30

Post #7 by essexpete » Thu Feb 23, 2017 9:38 am

Your weeping fuel line could be the problem if air is been drawn in as well.

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Re: Jcb 801.4 perkins 100.30

Post #8 by FOWLER MAN » Thu Feb 23, 2017 5:42 pm

Hi,
I haven't done much with these small Perkins engines so I can't be much help here except perhaps to clear up some confusion in this and other recent threads regarding lift pump performance.
The lift or feed pump on most engines operates at a pressure between 3&4 lbs. per sq. in. Many years ago I had an "AC" lift pump test rig to check this out.
That is enough pressure to squirt fuel from under your finger when applying modest finger pressure to an open bleed screw fitting or the open end of a fuel line.
As previously explained you can prime to the injector pump with the lift pump then open all injector pipes at the injector end and crank the engine till they spit fuel. Continue to crank the engine as you re-tighten the pipes.


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Re: Jcb 801.4 perkins 100.30

Post #9 by Nathanrogerbailey » Sun Feb 26, 2017 4:51 pm

New fuel line.

Bleed filter

Cracked unions at injectors. Cranked engine still no joy.

Would everyone say this is the injector pump now?


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Re: Jcb 801.4 perkins 100.30

Post #10 by essexpete » Sun Feb 26, 2017 5:56 pm

When you say no joy do you mean no fuel at the injector when you crack off the pipe? Or do you mean it just will not start?

I ask because I have a 4 cyl yanmar in a dumper that was a pig to start, sometimes when cold sometimes when hot. Electric fuel pump and bled through, disconnected the fuel shut off and still a problem. Put up with it for too long until one day the battery gave up. Fitted a larger and higher amp hr and instant starting. I think the large draw of the starter motor was dropping the power to the fuel shut off and/or not cranking the engine at a sufficient speed. Started the other day after many weeks - instant. Might be woofing up the wrong arb but just a thought.


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