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Old 27-09-2012, 06:28   #1
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Perkins 4107 - Wont Stop!

I just installed a rebuilt perkins 4107. After install, had to pull the exhuast maniford to put on my old custom one.

To do this, had to remove the fuel line to No1 injector.

When I put it all back together, it all works, starts a treat...

But then, i cant shut the motor down. Pulling the lever on top of the injector pump does nothing. To stop the donk, have to smoother the engine by blocking the air intake.

Whats my next move?
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Old 27-09-2012, 06:40   #2
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Re: Perkins 4107 - Wont Stop!

Sure sounds like the fuel shut off valve is not doing its job. The other BAD possibility is a botched rebuild. If your crakcase oil can get to the cylinders the engine will continue to run.
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Old 27-09-2012, 06:40   #3
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Re: Perkins 4107 - Wont Stop!

Sounds like a lube oil leak (into a cylinder) or............. the injection pump is not fully closing off the fuel.
  1. Pull the injectors and do a leak-down test
  2. While they are out, connect the fuel lines, bleed system, crank engine with shut down lever fully off. Observe injectors for fuel
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Old 27-09-2012, 11:01   #4
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Re: Perkins 4107 - Wont Stop!

If pressing the engine stop button does not stop the engine, your fuel solenoid may be frozen open, or the stop circuit may be faulty.

1. Check the fuel solenoid. If the piston plunger valve rack is extended, the solenoid is open and providing fuel. This is the “normal” un-energised position (energise to stop).
2. Jumper the solenoid terminal (S42, Grey /w Yellow stripe) to ground. The piston should retract, closing off fuel. Ensure that the piston (plunger rack) re-extends to the run position.
If not, tap gently to free it loose to close.
If not, replace solenoid.

It is very important to ensure that the piston is fully bottomed when final linkage is connected. If the solenoid is restricted from bottoming out in the retract/energized mode then it will burn out in approximately 30 seconds. Insufficient current will also result in failure.

TEST PROCEDURE TO DETERMINE PLUNGER HAS BOTTOMED:
On units with an auxiliary third terminal, connect a voltmeter or appropriate light (voltage rating) between auxiliary and "+" terminals. When the solenoid is energized and the piston bottoms (retracts), the voltmeter will indicate the battery voltage or the light is energized.

VISUAL METHOD:
Push the piston to the full bottomed (retracted) position and measure the plunger extension length from the solenoid body before the linkage is connected. Connect linkage and energize the solenoid. If the piston has fully bottomed, the piston extension lengths should be the same.
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Old 27-09-2012, 16:10   #5
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Re: Perkins 4107 - Wont Stop!

G'day Billwa,
Does your engine have a hydraulic or mechanical govener? hyd has vertical stop and throttle,mech has horizontal levers.What screws or nuts did you loosen when bleeding the hp fuel pump did you undo the bottom nut on the throttle body? What colour is the exhaust smoke? Has the hp fuel pump been opened up?
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Old 28-09-2012, 08:11   #6
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Re: Perkins 4107 - Wont Stop!

Quote:
Originally Posted by shakey doug View Post
G'day Billwa,
Does your engine have a hydraulic or mechanical govener? hyd has vertical stop and throttle,mech has horizontal levers.What screws or nuts did you loosen when bleeding the hp fuel pump did you undo the bottom nut on the throttle body? What colour is the exhaust smoke? Has the hp fuel pump been opened up?
from your description sounds like mechanical. Its the "earlier" type pictured in the service manual.

the only thing I loosened was the HP pipe to the injector on the front cylinder. Didnt bleed after I put it back on. Didnt touch the throttle body at all.

Smoke is pretty much clear until it turns black at overload.

The engine is running great, idleing fine, just as it was prior to the manifold work.

It is not an electrical/solonoid issue. There is not one connected. Shutdown is/was mechanical by operating a manual lever linked to a cam bolted to the back of the fuel pump.
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Old 30-09-2012, 04:03   #7
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Re: Perkins 4107 - Wont Stop!

Gday Billwa,
Well,if the hp pump has not been touched and was working without fault prior to your engine rebuild that puts a different slant on things. A clear exhaust suggests no lube oil is being burnt. Check the following.

1. Cold start thermo- valve is closing completely.
2.Check stop lever position on spindle making sure in moves it full operating distance.
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Old 30-09-2012, 06:07   #8
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Re: Perkins 4107 - Wont Stop!

G'day once again ,just remembered around 40 years ago i had a dpa type pump show the same symptoms as yours after being left on the shelve for sometime it had a sticking stop plunger----cure = a couple of hits on side of the pump using a wooden drift or soft hammer
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