2.5 TD fuel pump Help .......

sypher · Mar 7, 2009

Hi guys , Ive got a slight prob ----- Finding that the old girl was getting sluggish i rememberd that i never checked the pump filter after a full service , so off with the feed pipe and the filter nut ( yes it was full of crap ), and took everything out in order that i found it , BUT it doesnt seem right the way it came out .

Does anyone know the correct sequence of the springs & barrel ?????

there is a very weak spring thats not in the pic but it was far right ( still in the pump ) .

Any info would be great thanks

sypher · Mar 7, 2009

Dont worry guys now Ive found it now

pos · Mar 8, 2009

sypher said:
Hi guys , Ive got a slight prob ----- Finding that the old girl was getting sluggish i rememberd that i never checked the pump filter after a full service , so off with the feed pipe and the filter nut ( yes it was full of crap ), and took everything out in order that i found it , BUT it doesnt seem right the way it came out .

Does anyone know the correct sequence of the springs & barrel ?????

there is a very weak spring thats not in the pic but it was far right ( still in the pump ) .

Any info would be great thanks

This is something interesting that I've never seen or heard of before! Is that in the actual lucas / cav injection pump? And will my N/A have one? I want to see what state it's in!!!

Cheers
-pos

CharlesY · Mar 8, 2009

That device is the FUEL PRESSURE REGULATOR, and it is absolutely crucial to the correct operation of the injection pump.

The pieces laid out in the photo are NOT in the correct order and re-assembly that way may affect starting and running quite a lot.

CharlesY

discomania · Mar 8, 2009

It looks like the little plunger with the spring on it and the little pistons are the wrong way round.

sypher · Mar 8, 2009

pos said:
This is something interesting that I've never seen or heard of before! Is that in the actual lucas / cav injection pump? And will my N/A have one? I want to see what state it's in!!!

Cheers
-pos

Yes mate , your pump should be the same , if you follow the diagram that I posted you'll be fine

( dont follow the pic as its wrong , muppet befor me reassembled it wrong ) .

you might be supprised how much crap actually gets past the main fuel filter ...... mine was 3/4 blocked .

Be carefull taking out the filter though as its VERY fine and can hole easy ---- take the spring out first , then get a very clean rag and soak up the fuel so you can see what your doing - then use a clean pair of long nosed plyers insert them closed down the centre of the steel collor that holds the filter .
Open the plyers and gently twist a little and withdraw the whole assembly ( DO NOT PULL ON THE FILTER ) .

fish out the rest of the bits thats left in the pump - give it a good clean and reassemble as per the Diagram above .

Hope this helps

CharlesY · Mar 8, 2009

SEE THE THREAD BELOW - "Does mine have this"

Just the job - explains it all, and shows why I am going to Hell for sure

CharlesY

Ilson lad · Apr 13, 2009

Slightly off topic but still a bit relevant

The term CAV-is this a generic term as its stamped on my pump and I cant seem to see the brand lucas marked with it

The reason I ask is that is it not the Lucas pump which does not like biofuels & SVO's?
Cheers lads!

dirty hands · Apr 13, 2009

Ilson lad said:
...is it not the Lucas pump which does not like biofuels & SVO's?
Cheers lads!

You do hear that Lucas pumps don't like to be deprived of lubrication i.e thin mineral diesel running through them (not thick, badly filtered, stinky WVO ****e). It's been said a lot. So it might be true...

CharlesY · Apr 13, 2009

The rotary pumps we use were invented by CAV way back in the 1950s.

CAV and Lucas merged at some stage.

There is ONE part of a Lucas CAV DPA or DPC or DPS pump which MAY suffer from other fuels. That part is the intermediate rotary vane pump inside the injection pump. If the fuel is too thick the vanes may break. They are easy to fix.

The problem will NOT happen if you make sure your fuel isn't as thick as pig****. You want the fuel to be well-filtered, and not much less runny than pump diesel.

CharlesY

Ilson lad · Apr 13, 2009

Thanks boys! Happy with that

nobber · May 26, 2014

Guys I am having the same issue but I cant figure it out in the diagram, anybody want to give me an idea of the correct orientation of the parts please?

discomania · May 26, 2014

I found this photo from when I rebuilt my CAV.

I think they were laid out in the correct order for that photo. I'll check when I look at the diagram later, but I am certain this is it in the correct order because the relief plunger sits at the top and only opens after a certain pressure, i.e. it is held shut.

nobber · May 26, 2014

That looks about right , I put it in like that and it ran OK, the fiber washer wasnt looking too good but it did start. I need to put the water pump and timing cover on there before I can run it properly but it seems to have done the trick, thanks for posting.
Was the pump difficult to rebuild?

discomania · May 29, 2014

nobber said:
Was the pump difficult to rebuild?

Not really, but then again some people struggle to rebuild calipers, it's all relative.

2 things are important here, organisation and ability to follow instructions - these instructions can be your own photos, a video of the strip down, a manual or all three, just so long as you know where it all goes.

On the whole rebuilding an injection pump is really just cleaning and reassembling it with new seals and washers all round as they don't tend to wear anywhere unless they have been run on petrol or water got in or something.

nobber · May 29, 2014

Cheers fella, I might have a crack at it , I have a spare so nothing lost if I do fluff it up.

2.5 TD fuel pump Help .......

sypher

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