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Bloody engine


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#1 vic008

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Posted 19 January 2018 - 10:59 AM

Shibaura stopped the other day amd never really found fault. Anyway has been running good then yesterday replaced leaky hose to injector pump and wont go now. Checked glowplugs glow ok, spinning her over and fuel squirting to injectors.Even shot of ether didnt start. Suggestions plse.
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#2 vic008

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Posted 19 January 2018 - 11:00 AM

Injecters and injecter pump o'hauled 1 mth ago.
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#3 wheels

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Posted 19 January 2018 - 11:33 AM

So while turning over the engine, Crack open the nut on the feed pipe on the injector and let the air bleed out till it is pure fuel. While still turning over, you then nip the pipe nut back up again and hopefully it should fire.


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#4 vic008

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Posted 19 January 2018 - 01:36 PM

Done that and she spurts out the pipe ok. Dont see any movement in the clear return overflow hose.Thinks should see something happening?
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#5 Priscilla II

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Posted 19 January 2018 - 01:59 PM

Have you got a inline fuel pump say like this.wDWvvMk.jpg.

With the ignition on this will pump away merrily so that you can bleed the pump through to injectors without draining your battery.

The injector return line will not really burst into life until engine is humming away.

Glow plugs are a easy test.

If sure that injectors are receiving fuel then the only thing you are missing is compression.

Ether is not good for valves etc so avoid if possible.


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#6 vic008

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Posted 19 January 2018 - 02:08 PM

Have one similar but different. Just tried with glowplugs out, holding newspaper over hole ( expect fuel blown out of hole) but naught showed on paper.
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#7 vic008

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Posted 19 January 2018 - 02:12 PM

Hi, what would you torque to(similar to Bukh with a big hex then injector screw into that) ? Thanks
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#8 jim s

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Posted 19 January 2018 - 04:00 PM

I wonder about the very fine filter on the inlet banjo to the injector pump - they can partially block the supply to the pump and cause all sorts of wierd and intermittent trouble (and often they still indicate ok while winding the starter with an injector disconnected) - a bit of a long shot but it has happened before ... are you giving it plenty of throttle after the bleeding ? my 5 cents worth - good luck


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#9 wheels

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Posted 19 January 2018 - 04:50 PM

 

Done that and she spurts out the pipe ok. Dont see any movement in the clear return overflow hose.Thinks should see something happening?

You won't. It is a little wee dribble at best and only happens once fuel is at full pressure inside the Injector. There is a valve in the head of the Injector under a very heavy spring. As the fuel pressure rises, the pressure overcomes the spring tension and the seat of the valve lifts and the fuel squirts through the nozzle at that pressure, then the valve shuts. But there is still some fuel inside under pressure and it is that pressurised fuel that is then released as the "return" fuel.
It is this pressure required to lift that valve off it's seat, that air bubbles stop from happening. The Air bubble compresses and the pressure does not rise enough.
If you seem to have plenty of fuel, there is some other problem.

You don't have to have an electric lift pump. There should be a manual lift pump on the engine. Use this to ensure all air is out of the injector pump. You won't get the lift pump to push diesel out the injector tube. That can only be done by turning over the engine. If you are getting a good amount of fuel out the bleed screws, then filters must be ok.

Are you sure the battery is good and you are getting good turn over speed. That can make a huge difference.


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#10 jonathan

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Posted 22 January 2018 - 09:51 AM

CRC engine start goes a long way in situations like this,  I always carry 2 cans just in case, has save my ass offshore, the comment about a good battery is spot on, more amps = higher compression = easier starting every time.


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