Trouble with my 74 620

1972-1979 Datsun 620 forums. All 620-specific topics and discussion can be found here.
dfresh777
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Trouble with my 74 620

Postby dfresh777 » Mon Jun 14, 2010 12:08 pm

So here is the scoop, got the spark plug gap at.32 its getting fuel, will only idle for about 30 seconds. need help trying to figuare out the solution to the problem.

Got it torun today for 20 minutes at a high idle, when i hit the gas it died. i fired it over and held the throtle on the back of the carb and kepted it running, when i let it died it was out of gas in the little circle where you can view the carb fuel level. when i tried to start it again it was just puking gas into the carberator.

the carberator was re-built 6 months ago. i am truly at a loss!


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PEZi
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Re: Trouble with my 74 620

Postby PEZi » Mon Jun 14, 2010 6:54 pm

ok... so it ran longer today? awesome... that's progress!

i'm going to look more into the diagram for the carb... and see what might be happening. i'll also get some more people in here to take a look for ya and see if they have any opinions

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Mon Jun 14, 2010 7:03 pm

Every little bit of progress helps keep up my ambition to get it on the road.

Thank you for looking up more information.

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Wed Jun 16, 2010 2:07 pm

Any Luck? Anyone have Ideas?

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Wed Jun 16, 2010 3:23 pm

Update: After it spewed a bunch of gas in the carberator two days ago, that made its way through and now my spark plugs are soaked in gas and it wont run, so i pulled them out letting them dry. under the hood stinks of gas and its been two days, really looking for answers. i did tighten up the carberator where it mounts, it did fire over but was running horridly rough. what to do what to do??????????????

kamakazi620
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Re: Trouble with my 74 620

Postby kamakazi620 » Wed Jun 16, 2010 10:01 pm

simply do a weber upgrade you won't regret it,hitachi carbs are good when they work,notice I said "when" they work

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PEZi
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Re: Trouble with my 74 620

Postby PEZi » Wed Jun 16, 2010 10:45 pm

dfresh777 wrote:Update: After it spewed a bunch of gas in the carberator two days ago, that made its way through and now my spark plugs are soaked in gas and it wont run, so i pulled them out letting them dry. under the hood stinks of gas and its been two days, really looking for answers. i did tighten up the carberator where it mounts, it did fire over but was running horridly rough. what to do what to do??????????????
so its actually managing to spew gas into the engine to the point where its soaking the plugs? that's... well to say the least, not good. you said it was rebuilt recently? it just doesn't seem that everything was done right if so... its kinda the time to decide what path you want to take. messing around in the carb could work... do another rebuild or try to figure out what's wrong with it currently... it could take some time if you're not sure what to look at. the other option is to go with either a weber 32/36 DGV or a 32/36 DGEV. its is definitely a more expensive route, but it will run nearly flawless and is easier to work on in the future. there's a reason people swear by webers, and it is definitely your best route if you can do it

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Thu Jun 17, 2010 8:19 pm

Well i dont want to spend 300 bucks, so i will have to pull it off and look at everything. where would i start? everything is new on the carb when it was rebuilt 6 months ago. Anthony did you get the second picture i sent you with a question?

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PEZi
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Re: Trouble with my 74 620

Postby PEZi » Thu Jun 17, 2010 9:42 pm

oh... yes i did... the way it looks appears to be fine, unless i'm missing something.

if everything is new in the carb, you just need to make sure that it is all there, and that it is in there properly. does yours have an idle cutoff solenoid? i can't remember... if it does... that might be something to check on

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Fri Jun 18, 2010 8:41 am

i will take a look, once i figuare out where that is HA

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Charlie69
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Re: Trouble with my 74 620

Postby Charlie69 » Fri Jun 18, 2010 12:52 pm

It sounds like either the needle & seat are sticking & or the float is out of adjustment or sunk due to damage or corrosion.

I agree with PEZi720 put a Weber on it. The stock carburetors work great for about 10 years max. Yours is much older. The webers are the simplest carb on the market.

With your carb flooding so bad check the oil for fuel contamination. Also remember with wet plugs there is a good chance the oil coating on the cynderwalls is washed off.

kamakazi620
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Re: Trouble with my 74 620

Postby kamakazi620 » Sun Jun 20, 2010 12:35 am

dfresh777 wrote:Well i dont want to spend 300 bucks, so i will have to pull it off and look at everything. where would i start? everything is new on the carb when it was rebuilt 6 months ago. Anthony did you get the second picture i sent you with a question?

Try Craigslist!! I got my weber with a L16 intake for $80 bucks

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Mon Jun 21, 2010 10:04 pm

How did you search for it on Craigslist? if i can get a deal like that i would be willing to figuare out how to buy it

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Charlie69
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Re: Trouble with my 74 620

Postby Charlie69 » Mon Jun 21, 2010 11:37 pm

Also check the condensor in your distributor they will cause similar problem if they are going out, will not stay running. Cheap part to replace, before buying a carb.

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Sun Jun 27, 2010 3:05 pm

where is it located on the carb? how hard is it to fix? sorry this post is not what i ment it to be
Last edited by dfresh777 on Tue Jun 29, 2010 1:17 pm, edited 1 time in total.

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Charlie69
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Re: Trouble with my 74 620

Postby Charlie69 » Sun Jun 27, 2010 11:37 pm

dfresh777 wrote:where is it located on the carb? how hard is it to fix?
Who are you asking this question?

If you ar asking me the condenser is either inside your distributor cap by the points or mounted to the outside of the distributor.

Here is a picture of a 1974 620 condenser from Rock Auto.

Image

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jun 29, 2010 1:15 pm

Sorry about my tard post, i checked connections today they are solid. is there a special distributor cap for the 620 series? i got it to run today i know for sure the timing is just a hair off because it wants to stay running but it is just chugging along and then spits gas and dies or just dies.

it was also blowin blue is smoke when i would rev it up. i know that because of gas in the oil, i think i need to drain the oil and start fresh again.

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Charlie69
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Re: Trouble with my 74 620

Postby Charlie69 » Tue Jun 29, 2010 2:04 pm

I would definitely consider a rebuild on the motor. Run a compression test on it.

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jun 29, 2010 2:51 pm

Gotta remember, it pumped a bunch of gas in tot he motor about 2 weeks ago and i have not ran it since. So its burning it off and if i do an oil change and filter change it won't blow blue anymore, because before it was not blowing any color smoke at all.


How do i run a compression test?

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jun 29, 2010 3:41 pm

so i fired it over, no smoke ran till it got warmed up. then i was messing with the choke while it was warming up and it seem to idle better half open rather than fully open, so once i let go it chuged for 30 seconds spewed gas and died

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jun 29, 2010 4:31 pm

How do i Adjust the fuel flow in to my carb? i think it is getting to much once it warms up

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PEZi
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Re: Trouble with my 74 620

Postby PEZi » Tue Jun 29, 2010 8:36 pm

there should be a little idle adjustment screw on or near the baseplate of the carb.... if i recall correctly right is rich, left is lean

i got the video you sent me earlier.... WAY too much fuel... and even more interesting is that there seems to be a lot flowing out of the secondary... the truck was at idle right? there shouldn't really be any fuel in the secondary at all at idle, only the primary

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jun 29, 2010 9:04 pm

actully i was making it run, but later today i had it idling o n its own for 15 minute but once it got warm it was pushin that much gas before it choked i also think my choke is going out.

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Charlie69
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Re: Trouble with my 74 620

Postby Charlie69 » Tue Jun 29, 2010 9:59 pm

How do i run a compression test?

There is a video link on the Ratsun forum in the "How to " section by mklotz70. Also has videos on L motor valve adjustments.
Last edited by Charlie69 on Wed Jun 30, 2010 2:35 am, edited 1 time in total.

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jun 29, 2010 11:15 pm

Thank you, i will look into that when i have my next free time to work on it.

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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jul 06, 2010 2:35 pm

How do i post pictures directly on here?

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jul 06, 2010 2:48 pm

Started it up just to see if it would idle smooth, that failed by chugging not firing on all cyclinders. followed by spitting gas as it died.

here is a photo need to know what screw i need to adjust for gas flow? i have circled the two screw that i can see, not sure what one if either will work. http://mail.google.com/mail/?ui=2&ik=d0 ... =inline&zw

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jul 06, 2010 5:54 pm

Okay, so i have come to the convolution that i need to pull the carberator off and take it apart

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PEZi
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Re: Trouble with my 74 620

Postby PEZi » Tue Jul 06, 2010 9:37 pm

so... to post pics directly, you host them on something like photobucket, and copy the [IMG] code

in the pic... the screw should be the one that takes a flat head screwdriver

and the video of the start.... HOLY HELL!!! WAY TOO MUCH FUEL!!! appears you have WAY too much pressure somehow

dfresh777
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Re: Trouble with my 74 620

Postby dfresh777 » Tue Jul 06, 2010 10:49 pm

Yeah, my new project is to remove the carb and figuare out whats going on to make gas come out where its not suppose to be.


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