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nissan720

carb rebuild

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how many times can you rebuild a weber 32/36 dgev? Ive rebuilt mine once before.ihave had it for 20 years.Should i just buy a new one? i plan on keeping the truck.I have replaced the throttle shaft bushings with bearing kit.i have noticed a little difference in the performance over the years.I know nothing last forever.Just wondering if itss time to just get a new one.

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If the DGV is not stamped with "5A", it means it is a really old carb. Weber made some design changes starting with the 5A that make it run better during the transition from primary to secondary.

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It has made in Spain stamped on the carb just below the fuel inlet on the left side. 

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3 hours ago, nissan720 said:

It has made in Spain stamped on the carb just below the fuel inlet on the left side. 

Stamped or cast?

 

Did you look for the 5A on the base?

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it is cast i will look tomorrow for the 5a I bought this from 20 years ago from performance parts in New york.On the dgev the emulsion tubes have stamps on them.My father was disassembling the carb .He turned it upside and the tubes fell out one has f66 stamped on it.not sure what the other one has because i cannot read the stamping.is there anywhere i can get a repair or rebuild manual detailing these locations ?Just trying to get my 720 rolling again.i looked and DGAV S32 is stamped in the carb base.I also noticed that the primary jet and secondary jet were both stamped 135?

Edited by nissan720
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You can use this as a guide.  Lots of info.  There are also youtubes that people rebuild for reference, but be mindful that they are as good as the people making them.  "Grain of salt, if you will."

 

https://motofaction.org/mechanical-101/how-rebuild-clean-weber-32-36-dgv-dgav-dgev-dfv-dfev-dfav-carbs-carburetors-carburettors/

 

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truck cranks and runs as long as you keep your foot on the gas pedal.As soon as you take your foot off gas truck cuts off.won't ilde weber 32/36

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Turn the idle speed screw up?

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Plugged idle jet is the first cause.

could happen from rust or dirt in gas tank.

 

But if otherwise runs carb most likely ok unless a vacuum leak like from a cracked carb adapter if it’s a thin cast one.
 

I like new carbs myself but a 20 year carb is in the middle range myself.for me the accel pump diaphragm leaks which I have done a few over the years

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thanks for the reply,i will check for vacuum leaks.i am going to replace all the vacuum lines to.

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On 4/4/2020 at 9:11 PM, bilzbobaggins said:

Plugged idle jet?

 

And on cue, my weber stopped idling two days ago.  Plugged idle jet, this was a lint ball in mine.  Not sure where that came from.  Kinda think it might have been the nylon that is in the fuel line that got in there.

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Replace the filter anyway. Don't cheap out on them, or carry a spare, this could have happened at midnight in a rainstorm 100 miles from home.

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thanks datsenmike.I replaced the fuel filter today.truck run much better and smoother now.Had to order one from the local pars store.Couldn't believe they did't stock one.

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got up this morning went out to crank the truck.The same thing started up again.Did not want to idle.I pulled the gas filter and it had an orange tint to it.I am thinking the tank has some rust in it.Anyone have any ideas how this could happen?

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The 720 has a return line so slowly all the gas in the tank gets filtered and if you drive long enough again and again as you drive. Gas in the tank shouldn't be dirty in the first place.

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If you have a plastic see thru type cut it open and you can tell if it’s rusty in there.

if looks good and not a lot of rust then I say it’s ok there

bad idle is not going to be a fuel filter as at idle it uses barely any gas.Only on the higher end or load is when you can tell.

 

my521 had a idle proplem and it was dirty idle jet.cleaned it than happen again right in front of me.Replaced the filter and was good.open filter full of rust.the fuel tube is in the wheel well and water runs down inside past the clamp and gets in there

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Air leak? Spray starter fluid around the carb (Not in it) and see if the idle goes up.  Valve adjustment anytime lately?

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