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From a CAV pump to a Bosh

Transit Mk3, 4 & 5(smiley front) Forum. All Transits 1986 - 2000

From a CAV pump to a Bosh

Postby estellef » Tue May 14, 2024 5:32 pm

Hello,
I have a transit 2.5d mk3 from 1990.
No turbo, no electronic.
My CAV pump is leaking and broken.

Can you please tell me what equipment I need to do a swap to a Bosh Pump.

- Tubes ?
- New injectors ? ( Can I keep the old ones ?)

I have found somebody who has everything !

I have used the search engine, but any additional answer would help me.

this is this one .
On my lucas, the 'injectors returns" tube is doubled, while I can't see that on this.
Image

LUCAS :
star creator code
How will I do ? The rest seems to be ok.

BOSH :
Image
Image
Image
Image
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Re: From a CAV pump to a Bosh

Postby V184 » Tue May 14, 2024 9:57 pm

Injectors are different for Bosch pump
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Re: From a CAV pump to a Bosh

Postby Bruce e » Tue May 14, 2024 11:07 pm

You may need the crankshaft and camshaft pulleys as the belt profile is different. One of my mk3 has the same injectors as my mk5 the other has the older bigger two bolt tractor stile

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Re: From a CAV pump to a Bosh

Postby V184 » Wed May 15, 2024 4:17 pm

Bruce e wrote:You may need the crankshaft and camshaft pulleys as the belt profile is different. One of my mk3 has the same injectors as my mk5 the other has the older bigger two bolt tractor stile

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Injectors same fitting, different internal pressures etc :wink: pulleys should be ok ?
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Re: From a CAV pump to a Bosh

Postby estellef » Fri May 17, 2024 2:46 pm

Bruce e wrote:You may need the crankshaft and camshaft pulleys as the belt profile is different. One of my mk3 has the same injectors as my mk5 the other has the older bigger two bolt tractor stile

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Thank you, what do you mean about Two bolt tractor style please, is it Bosh compatible , thanks .
I will post a pic
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Re: From a CAV pump to a Bosh

Postby dumper » Fri May 17, 2024 3:19 pm

On my G reg mk3 190 with a Bosch pump I did the opposite change to a cav pump as we had a new reconditioned pump at work going in the scrap bin the only thing I can remember is having to play around with the injection pipes talking to the shop that reconditioned the pump they said remove the clamps and fit each pipe independently then makeup new clamps as it was a long time ago I don’t remember any problems it pinned up as normal and I ran it with the Bosch injector's it was still running 3 years later when I sold it so it must be possible to do the opposite
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Past camper vans
1974 mk1 v4 with 2.0 pinto fitted
1986 mk3 2.5 di swb
1990 190 lwb 2.5 di
1998 100 lwb 2.5 di
2006 350 jumbo 135 tdci
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Re: From a CAV pump to a Bosh

Postby Bruce e » Fri May 17, 2024 8:51 pm

I have two mk3s they have the same old style cav rotary pump but one has the same stanadyne pencil injectors as my mk5s with a single retaining bolt the other one has cav style injectors with two mounting bolts similar to my York 2.4 motor and most of the tractor's I work on.

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Re: From a CAV pump to a Bosh

Postby V184 » Sat May 18, 2024 3:30 pm

Bruce e wrote:I have two mk3s they have the same old style cav rotary pump but one has the same stanadyne pencil injectors as my mk5s with a single retaining bolt the other one has cav style injectors with two mounting bolts similar to my York 2.4 motor and most of the tractor's I work on.

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The injectors changed to stanadyne around 88 F reg along with the mt75 gearbox, the early turbos (very rare) continued with the two mounting injectors
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Re: From a CAV pump to a Bosh

Postby estellef » Tue May 21, 2024 8:42 pm

Hello,
I just received the BOSH pump, the injection pipes, the support.

The end of my accelerator cable doesn't fit on the pump ball, I guess it's because it's the old 1990 model?

The pulley looks exactly the same and the timing the same.

What bothers me is the diesel outlet and inlet tubes which are not the same size, he sent me the original ones but one is cut, otherwise the filter support is the same, one Lucas.
From what I understand, I am blocked by the accelerator cable which does not fit into the pump ball and the 2 inlet-outlet tubes.

With the lucas, the fuel outlet was in the tank, and it looks like the fuel outlet is in the fuel filter with the bosh pump, I don't know if that will be a problem.

Another problem, I can't turn the bosh pump by hand. I read elsewhere that they are hard unlike the Lucas, but I wouldn't want to break the engine.

My bosh pump number is 0 460 414 142 VE4


I don't know at all if it could have seized and I don't know if it's normal, I don't dare to force it by hand.

On the other hand, it fits perfectly into the support, and I was surprised that the pulley was adjusted the same as the lucas, the hole is in the same place.

The fuel filter holder he gave me has fuel pipes stuck in it, I don't understand.


Any help appreciated.

I also have a very stupid question, I can't understand if the diesel inlet is at the front or at the back of the bosh pump....
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Re: From a CAV pump to a Bosh

Postby estellef » Tue May 21, 2024 10:11 pm

Ok, I think I have tried to plug the accelerator cable at the wrong place, it was below
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Re: From a CAV pump to a Bosh

Postby estellef » Wed May 22, 2024 10:15 am

Edition :
I have found a complete Lucas CAV to BOSH swap Ford Transit tutorial there :
https://www.ford-transit-forum.com/t767 ... moteur-25l

but it's in French and you have to be registered, There are pics and all of that, you can translate.
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Re: From a CAV pump to a Bosh

Postby estellef » Wed May 22, 2024 11:05 am

Bruce e wrote:I have two mk3s they have the same old style cav rotary pump but one has the same stanadyne pencil injectors as my mk5s with a single retaining bolt the other one has cav style injectors with two mounting bolts similar to my York 2.4 motor and most of the tractor's I work on.

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Hello Bruce ,

I still have the old injectors tractor type with the returns from 1990, the hose was fixed at the top of the lucas pump, on the front, on a pilone. ,
can I plug theses return at the back of the Bosh Pump, please ?
I can buy a longer hose and plug it there ?.
Please don't tell me I have to buy 4 news injectors with no returns, oh nooo.
People seem to say that the old tractors double injectors were compatible, is it true ?
Thanks a lot !
If somebody needs the french tuto I can maybe save it
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