Volvo 343 1.4 32DIR

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stemo
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Joined: 02 Jan 2013 05:58 pm

Volvo 343 1.4 32DIR

Post by stemo » 02 Jan 2013 06:06 pm

I know this is a very cheeky first post but I will post a hello thread at a later date! :oops:

The wifes '81 343 has failed it's MOT on emissions, the carb was massively overfuelling so despite being played with for hours it still ran very rich! I'm led to believe it's a Weber 32DIR (correct me if I'm wrong). Does anybody have a known good one for sale? I've only been able to find one and that's on ebay in Italy and is quite pricey!

Any help would be much appreciated! :)

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mac
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Re: Volvo 343 1.4 32DIR

Post by mac » 02 Jan 2013 06:52 pm

Welcome stemo,

If your carb is grossly over fuelling there are a limited range of possible reasons almost all of which are solveable. Before simply changing the unit for an "unknown" it might be better (and more economical) to do a little investigating of the existing carb (and yes on a UK spec. B14 it will be a Weber 32DIR variant.

Possibles :- (in no particular order)

Blocked fuel pump return line leading to high fuel pressure.
Incorrectly set carb float height.
Punctured carb float.
Loose carb top bolts allowing fuel to "wick" over the f/chamber lip.
Internal crack in carb body.
Displaced (fallen out) primary barrel main jet.
Severe blockage of air inlet/air cleaner.
Gross maladjustment of CO screw - Note this will ONLY affect mixture at idle speed not at higher revs.
Gross maladjustment of choke mechanism.
Seized or partially seized choke flap/s.

If you are able yourself, or know of a "mechanic" the 32 DIR is a relatively simple carburettor to recondition and rebuild kits are fairly easy to obtain for about £35 or so.

In extremis - a replacement unit - but it will still need to be checked and correctly set up and adjusted - and may well have problems of it's own!

Hope this helps - if you need more info just ask.

Mac.
88 5door Redline 1.7 52k - 19 XC60 Momentum Pro D4 AWD 17k
1950 pair of legs that don't work very well.

Evoman
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Re: Volvo 343 1.4 32DIR

Post by Evoman » 02 Jan 2013 09:57 pm

As far as I am aware 81 shouldnt be tested for emission, only visual? could try the mot at a different station.
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macplaxton
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Re: Volvo 343 1.4 32DIR

Post by macplaxton » 02 Jan 2013 10:25 pm

Evoman wrote:As far as I am aware 81 shouldnt be tested for emission, only visual? could try the mot at a different station.
Chris, I don't know what the significance is of 1981 in your mind?? It's only a visual for vehicles first used before 1st August 1975. (exhibit "A") :wink:
72 DAF 44 Estate 78 Volvo 343DL Black BeautyImageImage
82 Volvo 343DL CVTImageImage 88 Volvo 340DL Diesel

Evoman
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Re: Volvo 343 1.4 32DIR

Post by Evoman » 02 Jan 2013 11:52 pm

macplaxton wrote:
Evoman wrote:As far as I am aware 81 shouldnt be tested for emission, only visual? could try the mot at a different station.
Chris, I don't know what the significance is of 1981 in your mind?? It's only a visual for vehicles first used before 1st August 1975. (exhibit "A") :wink:
ah, i knew it was certain age, 81 is alittle newer than 75 :) thank you
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stemo
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Re: Volvo 343 1.4 32DIR

Post by stemo » 03 Jan 2013 12:07 am

Mac, many thanks for the reply, I'll get the carb off and start having a proper poke around and see just exactly what's what in there and if need be order a rebuild kit, never rebuilt a carb but I'm sure I can give it a damned good shot! Thanks.

My MOT man is a safe bet, been a family friend for years and looks after my Carlton very well at MOT times - not in a dodgy way, just a genuine test!

Thanks guys - seems like a good forum to be a part of already 8)

MCHUDD
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Re: Volvo 343 1.4 32DIR

Post by MCHUDD » 03 Jan 2013 10:56 am

Hi mate.
My bannana is 1981 and it has to be tested for omissions.
Love to see some pictures of the car.
Welcome to the fold :lol:
Cheers Mark.
sm69 sm69 sm69 sm69 sm69 sm69

Rubenv340
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Re: Volvo 343 1.4 32DIR

Post by Rubenv340 » 08 Jan 2013 08:03 pm

" Gross maladjustment of CO screw - Note this will ONLY affect mixture at idle speed not at higher revs. "

What do you mean? Adjusting the mixture screw will only adjust idle fuel? Not the overall rpm range injection of fuel?

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mac
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Re: Volvo 343 1.4 32DIR

Post by mac » 08 Jan 2013 08:32 pm

Yes, the 32 Dir mixture screw ONLY affects the mixture passing through the idle bypass passages. In a fixed jet/fixed choke design the overall mixture is determined by the size and shape of the choke (carb barrel) tubes and the calibration of the main jets. The effect an overall mixture change you change the size of the jet orifii.

Hopefully by now you will have received my article which will fully explain the principles in the "theory" section.

It is a very common misunderstanding that the mixture screw changes the overall mixture range - not so.

If however you take the case of CD type carburettors (Stomberg, Skinners Union, DVG) then the mixture adjustment truly does affect the full range. In such carbs the fuel is metered, not by a fixed jet, but by a tapered needle moving within a jet assembly producing the equivalent of a fixed main jet with a variable orifice.

Simple really.

Mac.
88 5door Redline 1.7 52k - 19 XC60 Momentum Pro D4 AWD 17k
1950 pair of legs that don't work very well.

Rubenv340
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Re: Volvo 343 1.4 32DIR

Post by Rubenv340 » 09 Jan 2013 09:49 pm

So, i was wrong all this time haha I really thought it was affecting all the rpm range, not just the idle lol :p

About the article, not yet, should be here in the next days, sometimes they are lazy with the shipping.

Thanks

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mac
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Re: Volvo 343 1.4 32DIR

Post by mac » 09 Jan 2013 10:53 pm

Ruben,

Article was posted @15.35 on 03/01/13.

Give it a few more days and if it doesn't turn up I'll have a moan at the Post Office and send you another one.

Mac.
88 5door Redline 1.7 52k - 19 XC60 Momentum Pro D4 AWD 17k
1950 pair of legs that don't work very well.

Rubenv340
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Re: Volvo 343 1.4 32DIR

Post by Rubenv340 » 10 Jan 2013 12:25 am

mac wrote:Ruben,

Article was posted @15.35 on 03/01/13.

Give it a few more days and if it doesn't turn up I'll have a moan at the Post Office and send you another one.

Mac.
Sometimes i have items from Uk like in 2 or 3 days, other times it takes a couple of days extra, depends.
I'll give you a touch when i receive it.

Thanks

stemo
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Joined: 02 Jan 2013 05:58 pm

Re: Volvo 343 1.4 32DIR

Post by stemo » 04 Apr 2013 08:21 pm

Hey guys,

Just wanted to post back (taken a while I know!) Managed to get hold of a brand new carb for a very good price and proved to be the quicker option in interests of getting the car back on the road asap. Will however be rebuilding the old one when I get a moment!

Thanks for all the help.

MCHUDD
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Re: Volvo 343 1.4 32DIR

Post by MCHUDD » 05 Apr 2013 11:51 am

Hi mate.
Pictures please. Everybody here loves drooling over pictures :lol: :lol: :lol:
Cheers Mark.
sm4 sm4 sm4

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mac
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Re: Volvo 343 1.4 32DIR

Post by mac » 05 Apr 2013 05:11 pm

To some of us here a picture on a brand new carburettor is pure porn!

Mac.
88 5door Redline 1.7 52k - 19 XC60 Momentum Pro D4 AWD 17k
1950 pair of legs that don't work very well.

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