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Lister CS Injection pump problems

Hi Gents,

I am rebuilding a 1951 Lister CS 5/1 fitted with a CAV I.P and a Bryce injector.

I have bled the fuel line and I am getting squirts of diesel at the injector end of the hp fuel line, but the injector (known to be a good one and tested on another pump) fails to fire.

I deduce that the problem lies with the pump, either drawing air into the line or just failing to be able to produce enough pressure to overcome the spring pressure within the injector.

I am sure someone on the list is an expert on the CAV pump and can give me a full description of the likely failure.

Is this something I can fix, or would I be best advised I take the pump and injector to a diesel injection specialist, for repair and re-calibration?

I would be interested to learn from others that have experienced injector pump problems, and any advice on the inner workings would be appreciated.

Thanks,

Ken

Reply to
Ken_Boak
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Sorry,

Correction, the injector is also CAV, type BKB50S507b as fitted to most of the smaller Lister engines.

The pump is the standard CAV BPF1B70CS6253 . (Thanks to Peter's old engine pages for help identifying these parts).

Ken

Reply to
Ken_Boak

Have you checked the delivery valve on top of the pump?

Peter

-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:

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Reply to
Peter A Forbes

Ken,

Before you get to deep are you sure fuel in and out of the pump is totally airtight as any leak will cause a problem. All seals should be copper washers. When you operate the pump do you feel resistance, I assume you are using the hand pump.

Reply to
Campingstoveman

Thanks Peter and Martin,

I suspect the delivery valve, as when I bled the system, I applied a little pressure to the fuel tank by mouth, and I saw fuel weeping from out of the top of the injector, suggesting that the valve was not sealing.

Is this something that I can easily access and clean without risking damaging the plunger. Are there any serviceable parts that I should have before I begin.

Peter's article on common diesel injection systems was most informative, but I am still not fully confident on unscrewing the delivery pipe connection to get at the valve, without opening a can of worms.

The hand pump on the CS is for priming the oil only - unless I am totally mistaken.

Further advice sought please.

Ken

Reply to
Ken_Boak

Yes the hand pump is only for oil. Whip the delivery valve out. There's nothing of which to be frit ttfn Roland

Reply to
Roland Craven

Other than losing the spring

Tim

Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

Reply to
Tim Leech

Thanks Ronald,

So I can access the delivery valve and remove it out of the top, without disturbing the plunger?

Ken

Reply to
Ken_Boak

WTF Ronald????????????????????????????

Reply to
Roland Craven

Something to do with Hamburglars? :-))

The delivery valve is under the top housing which should unscrew and there is a spring, seat and valve centre inside.

If the valve is leaking or the spring is bust, then you won't maintain a decent pressure in the system at injection time.

I think we have spare valves, haven't dug the box out for ages.

The other thing is of course the element itself, which may be U/S. Or has been assembled back to front.

Peter

-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:

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Reply to
Peter A Forbes

All the letters are correct so whats the problem :-))

Mart> WTF Ronald????????????????????????????

Reply to
Campingstoveman

Gents,

The engine is now running, albeit without a silencer!

The delivery valve had stuck in the up position and needed a little very gentle persuasion to get it to move freely.

Using some air pre-heating with a propane torch, I managed to get the engine to start and sustain running.

Thanks for all the advice,

Ken

Reply to
Ken_Boak

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