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I need one of these

Post by Smellfire » Subscribing Member » Fri May 25, 2018 1:38 pm
Joined: Fri Mar 16, 2018 8:01 am
Posts: 12
Diesel Pump, Lift pump? Which is it please. I am not mechanically minded and no, i wont be fitting it myself! ;)

Ideas on locating one would be good to, thanks as always! :)

2.3 Diesel

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Re: I need one of these

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Post by Phil Bradshaw » Club admin » Fri May 25, 2018 2:11 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3587
Injection pump, Bosch VE L 37/2 for CF2 models (much the same as VE L 37/1 for earlier 23D models but with a cold start advance lever).

Normal procedure for injection pumps is to get the original unit serviced by a local diesel specialist: this won't be cheap (hereabouts about £200 including VAT) but buying one off the shelf can be painful.

Is there a particular reason for needing the pump servicing? Usually its the last resort after going through everything else in the fuel system.

All too often important bits may have been mistakenly removed or replaced with inappropriate parts in previous ownership...

Do you have a photo showing all the top front of the engine?

Looks to me like yours has an independent brake exhauster ('vacuum pump') and double pulley for 23D prior to 1984; CF2 models have an exhauster on the back of the alternator.
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: I need one of these

Post by Smellfire » Subscribing Member » Fri May 25, 2018 2:36 pm
Joined: Fri Mar 16, 2018 8:01 am
Posts: 12
No I don't have a picture. The camper is at a local garage at the moment.

Fuel gets to here, then trickles out of one pipe, but none of the others. Mechanic reckons this is shot.

I can probably get a lift down later to take better pictures. Would rather not get the wrong part.

Engine numbers any help for engine year? I could get those to while I am down there.

Thanks for help BTW ;)

Re: I need one of these

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Post by Phil Bradshaw » Club admin » Fri May 25, 2018 4:53 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3587
Engine number will help along with the numbers stamped on a pad on the injection pump, on the accelerator cable side about 30mm below the cable bracket. Expect to see two rows of characters on the pump, upside down when it is installed.

Fuel system on GM diesel engines has some peculiarities that aren't very well known outside of CF land - it's a long way from current electronically managed systems that's for sure. Some peculiarities often are introduced after manufacture... :wall:

Venting

Remove vent plug screw from the centre of the top of the pump; thin sealing washer also must be retreived rather than lose it!

Vent the pump as normal using the hand primer until fuel issues from the vent hole. If fuel only weeps out then rotate crankshaft a bit at a time until fuel flows more freely.

Now crank the engine on the starter motor. Alternator should be protected from fuel spillage if not already shielded.

If spurts at least 5cm high come from the vent hole after a few turns of the engine then the internal vane pump is working (joy) and venting can be finished using the hand primer after refitting the screw.

Sometimes fuel will remain in the vent hole - depends where the pumping element stops in relation to its inlet port - but vent by hand to finish anyway.

Two injector pipes must be slackened at the injectors in order to vent the pump high pressure head by cranking the engine using the starter motor.

Once fuel spits from the slackened unions these can be tightened after which the engine should try to start.

Cranking to start should be continuous rather than short stabs: once one cylinder starts to fire the others should soon pick up and the engine will run.

If the engine refuses to run, or if fuel doesn't spurt from the vent hole when the engine is cranked, then check everything else before removing the injection pump.

Common issues to check for on CFs (23D)

Fuel leakage from under the hand primer button indicating split or torn diaphragm.

Check for any of these missing or replaced by something else that does not do exactly the same job -

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Banjo connections not having crimped hose ends should be closely examined for condition and security; if a banjo can be twisted in its hose then renew the connection.

Missing diaphragm valve is rather common...

Serviceable valve works as a pressure regulator and will appear blocked when air blown through but will pass fuel under pressure from the lift pump. Valve that does not seal against back flow when system at rest is faulty but this is rare.

This valve is essential because the vane pump inside the injection pump will struggle if it has to draw fuel from un-pressurised inlet.

The injection pump has a bleed orifice on its outlet to maintain constant back pressure within the pump when operating, not a conventional one-way valve. If one has been fitted then it should be deleted.

Filter overflow should go to a tee connection with the injector leak-off pipes. Tank return pipe to the tee should blow through easily once clear of residual fuel (tank filler cap removed).

Hand primer that sticks out enough to come into contact with the cab engine cover may be the Transit type; check for flap valve in the filter head -

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Valve should buzz audibly when low pressure air is applied to its inlet side. (Bosch part number is CF type.)

Lift pump low down on the timing chain case: check for blocked screen filter under removable cap and ineffective (hardened) O-ring cap seal. Output pressure should be 0.2-0.31 bar (3-4.5 psi).

Fuel lines: check any hose connections to plastic pipes for crushed pipes restricting fuel flow and, or, allowing air ingress.

Plastic pipes must have metal ferrules pressed into the ends to prevent crush. (Boiling water to soften pipe ends enough to press in bits of steel or cupro-nickel tube with sharp edges removed.)

All worm drive hose clips on fuel lines should be discarded and replaced by fuel pipe clips that remain circular when fitted -

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Also check fuel hoses for internal blockage and wetness indicating leakage through hose walls.

If the fuel pipe to the lift pump won't blow through to the tank (bubbling in fuel content, filler cap removed) then check tank outlet pipe for blockage in the bend above the tank. On CF2 models choked filter sock inside tank also can be a problem.

Howto for injection pump timing is here.
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: I need one of these

Post by Smellfire » Subscribing Member » Fri May 25, 2018 5:31 pm
Joined: Fri Mar 16, 2018 8:01 am
Posts: 12
Wow thats brilliant m8, I'll print that off and give it to him.

Pump no is R91128865

Engine No (Off the top of the block inside the cab) 90088351

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Engine Pic

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Re: I need one of these

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Post by Phil Bradshaw » Club admin » Fri May 25, 2018 6:16 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3587
Odd. The brake exhauster on top of the engine isn't CF2 but the van certainly is. The problem is that it can be retro-fitted to a CF2 if the alternator-driven exhauster packs in.

90088351 is the casting number for the cylinder head, only used in the factory.

Plate with the R number means a factory service exchange part but there's nothing coming up with that number in GM Parts catalogues that are available. Bosch number will be underneath the plate.

If the label on top of the engine is similar to the logo on the pump plate then the engine may have been a factory exchange unit. Doesn't mean it's a CF2 unit though: after CF production ceased getting an exact replacement got harder as supply dried up.

Engine number should determine what it is: number is stamped on a pad close to the fuel filter at the cylinder head to block gasket joint -

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(Prefix 23DT is for Frontera 23D Turbo; CF prefix is 23D.)
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: I need one of these

Post by Smellfire » Subscribing Member » Fri May 25, 2018 6:35 pm
Joined: Fri Mar 16, 2018 8:01 am
Posts: 12
The Engine is a recon unit, label just says who from, no other info.

I'll have a look on Tuesday, off cycle touring this weekend supposedly but the forcast for where were going looks horrific with flash floods! ;)

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