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Mk1 1.7 V4 carburettor 1972/3

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Mk1 1.7 V4 carburettor 1972/3

Postby Mikexx » Mon Apr 01, 2024 12:29 am

The carb on my camper has history. It was replaced a long time ago with a Zenith 361V or is it "36 IV" from a Ford Corsair. I don't think I have the old one.

The camper has been stood still for some years and so trying to get it gong again. I purchased one of these:
https://www.ebay.co.uk/itm/256072293421
A "Zenith copy 361V" which I assume is a Chinese clone. It looks fairly well built but had to modify the fuel inlet as this one fouled the distributor.
The float side was initial leaking fuel and overflowing. This was cured with some PTFE tape on the seat to seal the thread. There is no longer a dribble into the venturi.

The engine runs, but runs rough. It feels like it is over-fuelling and over-rich. It won't idle. If I close the choke strangler it doesn't like it.

I note this new carb is for a 2.25 Petrol Landrover and hoped I might get away with it, but obviously not. Hindsight is a wonderful thing!

I believe this carb was only fitted prior to 1968 with Motorcraft one after this date. In theory I should therefore have this one although the mounting is the same.

I am hoping for some advice, is the jetting such I can transfer parts across or should I consider another way forward? The Motorcraft carb availability seems like he's teeth.
Mikexx
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Re: Mk1 1.7 V4 carburettor 1972/3

Postby dumper » Mon Apr 01, 2024 6:29 am

I can’t remember if it’s the same as the motorcraft one but you should be able to change the main jet in the bottom of the top half it will have a number on the brass jet back in the day it was easy to get different jets not sure were to nowadays.
Another thing that can effect the mixture is the float level if set to high it will be to rich.
MK 8 L4 H3 Motorsport campervan
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
dumper
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Re: Mk1 1.7 V4 carburettor 1972/3

Postby Mikexx » Mon Apr 01, 2024 11:31 am

Thanks for your input.

The first Zenith 361V worked fine and so must have been jetted ok, sufficiently well for a good running engine.

I am thinking of swapping the jets over. They will need some cleaning as they're covered in white powder (of the zinc/aluminium oxide variety).

The float level should be fine, and might even be a little low. I'm paranoid of the fuel dribbling into the venturi. It has an electric pump so fuel is under pressure even when stationary.
Mikexx
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Re: Mk1 1.7 V4 carburettor 1972/3

Postby dumper » Tue Apr 02, 2024 7:06 am

Yes swap the jets over should have a number on them,when we used to fit twin forties carbs to escorts we used to to fit a filter king pressure regulator to them to control the pressure
MK 8 L4 H3 Motorsport campervan
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
dumper
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Posts: 5451
Joined: Sun Jan 20, 2008 2:56 pm
Location: Lincolnshire

Re: Mk1 1.7 V4 carburettor 1972/3

Postby DougT » Tue Apr 02, 2024 8:55 pm

Also it might be worth checking what the electric fuel pump does when you block the outlet. I think the electric pumps intended for use with carbs have an internal return system so as not to overpressure the float needle.

Some carbs have a return line back to the tank but it sounds like neither your old or new carbs have a return line and maybe the Zenith float valve was better at dealing with pressure ?

Doug
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Re: Mk1 1.7 V4 carburettor 1972/3

Postby Mikexx » Sun Apr 07, 2024 8:31 pm

Many thanks for the posts.

I swapped the main and compensating jets and it now runs. In fact when hot it seemed to be running lean.

I straightened the servo assist pipe and the revs increased. Another tell-tale sign was that removing plug lead 2 from the distributor cap had no effect whereas the others did.

Fitted new vacuum servo pipe and ran a little better, but still no change in idle when plug lead no 2 was disconnected. Clamped the servo pipe and this time and it stalled.

I've refitted the master cylinder and used some silicone sealant just in case there has to be a air tight seal there but not had a chance to run and check if No 2 is still weak or misfiring.

Is this a common issue? Do servos leak? Can they be repaired? Do replacements exist?
Mikexx
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Re: Mk1 1.7 V4 carburettor 1972/3

Postby dumper » Mon Apr 08, 2024 6:47 am

I’ve had servos leak in the past out of the piston rod and just changed it never looked into repair but maybe possible as for misfire on cylinder number 2 do the usual checks plug / lead /compression / valve clearance
MK 8 L4 H3 Motorsport campervan
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
dumper
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Posts: 5451
Joined: Sun Jan 20, 2008 2:56 pm
Location: Lincolnshire

Re: Mk1 1.7 V4 carburettor 1972/3

Postby Mikexx » Mon Apr 08, 2024 11:33 am

Thanks for the reply.

Do you mean leaks on the cabin side?

I suppose I could collapse the pipe or blank the 'inlet' to confirm.

I swapped plugs but haven't carried out any more tests. I'm more pleased that it runs after being stood still for over 10 years.
Mikexx
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Re: Mk1 1.7 V4 carburettor 1972/3

Postby dumper » Mon Apr 08, 2024 3:41 pm

No I mean if it’s missing on number 2 make sure it’s not low compression piston or a valve problem
MK 8 L4 H3 Motorsport campervan
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
dumper
Transit Extremist
Transit Extremist
 
Posts: 5451
Joined: Sun Jan 20, 2008 2:56 pm
Location: Lincolnshire


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