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new here, first 521, first Datsun, finding parts?


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#21 DanielC

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Posted 17 December 2017 - 12:16 PM

That air cleaner top is off a later model Datsun.
Take the air cleaner, give us a picture of the carb on the engine.
I noticed the vacuum advance to the distributor is off the manifold. Stock is on ported vacuum off the carb, no vacuum advance at idle.



#22 rodjr

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Posted 17 December 2017 - 12:37 PM

That air cleaner top is off a later model Datsun.
Take the air cleaner, give us a picture of the carb on the engine.
I noticed the vacuum advance to the distributor is off the manifold. Stock is on ported vacuum off the carb, no vacuum advance at idle.

Yes, i do have an air cleaner cover with the manual heat riser lever that came with the truck, but i have no base. That is the first item on my list if i can find one.

I also noticed it was manifold vacuum but at a glance i did not see the ported vacuum nipple, lots going on and i just get a minute or two here and there today.

 

Carb:

 

sh7UZPM.jpg

ZXdXRmf.jpg



#23 Charlie69

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Posted 17 December 2017 - 01:14 PM

From your description it sounds like either the engine is not up to oporating temperature or the choke is not releasing completely.



#24 bananahamuck

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Posted 17 December 2017 - 01:16 PM

Throw some WD40 at the linkage 


So somehow while i was driving back from Eaglerock swap meet i somehow caused YOU to post this,,,, do really think members on this site are that stupid to believe i caused it??

http://community.rat...un-for-a-while/

Yeah i guess you do,,

 

BTW ,,,, the first person to call you a pussy,,,, ya might wanna check out his ethnicity ,, cuz i don't think it's what you think it is there snowflakeboy

 


..........................I shall call it, narclops.

 

 

 


#25 wayno

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Posted 17 December 2017 - 02:41 PM

The vacuum advance needs to piped correctly also, the way it is cannot be good for it.


 

 


#26 rodjr

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Posted 17 December 2017 - 03:03 PM

I hear ya but there does not seem to be a ported vacuum nipple on this carb,......new challenge.



#27 wayno

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Posted 17 December 2017 - 03:16 PM

I suspect the port is on the valve cover side down really low where it is hard to see, but I don't own any L16 carbs to tell you where it is for sure.


 

 


#28 datzenmike

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Posted 17 December 2017 - 04:14 PM

Air filter is also missing the snorkel so the heated air from the manifold has no where to go.

 

Vacuum advance is ported from a fitting on the base of the carb on the valve cover side. It will work a lot better but will probably need the timing reset.


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#29 rodjr

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Posted 17 December 2017 - 06:19 PM

Yep air cleaner housing is a hacked up joke, already have some leads on parts though, lot's of good folks here.

No ported vacuum on the carb, there is a dimple in the base, but was either not originally machined or has been plugged, hard to tell.

I did get another carb with the truck but it is in 3 different ziplocks, i do see a ported vacuum nipple in the throttle plate for that one.

 

Question:

are the original Hitachi carbs worth going down the rabbit hole, or would i do better to go weber and put my energy into making an adapter to use the stock air cleaner?



#30 mainer311

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Posted 17 December 2017 - 08:07 PM

Depends on how worn the butterfly shaft is. I just rebuilt mine, but only because the throttle shaft doesn’t appear to be leaking yet. If you can move the shaft side to side on the linkage end, it most likely leaks. At that point, probably not worth the hassle.

Supposedly the Webers flow slightly more CFM.

#31 datzenmike

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Posted 17 December 2017 - 08:20 PM

174_4d9fd4894d535.jpg

 

Port should be a small brass tube end sticking out just below or in front of that mixture adjusting screw. This carb has an extra for the EGR but your carb will only have the one.

.


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#32 rodjr

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Posted 17 December 2017 - 08:47 PM

174_4d9fd4894d535.jpg

 

Port should be a small brass tube end sticking out just below or in front of that mixture adjusting screw. This carb has an extra for the EGR but your carb will only have the one.

.

 

No nipple there whatsoever, just a dimple in the casting maybe .030" deep.



#33 DanielC

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Posted 17 December 2017 - 10:03 PM

Air cleaner Lid
AirCleanerLid.JPG

Air Filter, I think this may still be available from your friendly neighborhood Nissan dealer.  This is not a Nissan air filter.
AirFilter.JPG

 

Carb heat duct
CarbHeat.JPG

 

The metal nut with a small pipe line going in to is ported vacuum to the distributor.
VacPort1.JPG

 

To avoid confusion, the phillips head screwdriver is resting on the distributor vacuum port nut.
VacPort2.JPG

 

Distrubutor vacuum line, small line below the two other hoses.
VacLine.JPG

 

Distributor vacuum line on distributor.
VacDist.JPG



#34 rodjr

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Posted 17 December 2017 - 10:38 PM

that's the spot, but just a dimple in my carb base, plugged solid, no nipple no threads. looks like it was cast that way, or somebody did a nice job of plugging it to make it look as cast. I will pull the carb soon and if the throttle base is in fact drilled at the throttle plates and someone just plugged the outside, i can throw it on the mill and drill it out. I will also check the shafts, if they are loose, maybe i can turn some bushings providing the base plate has room to bore and sleeve.

 

I have that air filter lid and support bracket but no base.

 

Thanks for the pics.



#35 banzai510(hainz)

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Posted 21 December 2017 - 06:40 AM

Truck looks great

I would buff it out  Leave the pantina color, sort out what is wrong and maybe lower it down abit. Paint the rims white and run the stocksamll white wal tires .(this is me off coarse and dont need to spens 30K$ on this to have a cool truck. All the kids give me the thumbs up and didnt have to spend alot on Pimp wheels ect...... 

 

 

change the oil and ck the oil in diff and trans and grease the kingpins and drivelline


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#36 rodjr

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Posted 24 December 2017 - 04:24 PM

With a huge thank you to Wayno on here, it looks like i will be picking up a seat (and possibly a few other goodies) on Tuesday. Found an air cleaner in Oregon on craigslist. Hoping to get time later in the week to pull the carb and see if i can drill the ported vacuum open. 

 

At the moment, we have a fire in the wood stove, it is snowing, there is lot's of really really yummy stuff to snack on and i am not going to do diddly.



#37 rodjr

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Posted 29 December 2017 - 07:09 PM

Finally got a minute to work on things a bit. Here is what i have learned so far:

 

1) Kingpins are beyond gone! i can gab both front wheels and pull the bottom of either out well over an inch.

2) vac port on carb has been plugged with some kind of epoxy, working on this tomorrow.

3) runs good but falls on its face when taking off in first, maybe related to vac advance being wrong?

4) adjusted clutch, much better but still engages at the top of the pedal travel.

5) all the joints up front have no dust seals remaining and zerks are seized so no new grease going in till they are replaced.

6) brakes adjusted well but pedal is soft on the first hit, second time they are right at the top. Thinking air or a bad wheel cylinder.

7) pcv valve is connected to...nothing, what appears to be a vent tube coming from the block is attached directly to the intake manifold. Anybody now where i can find a diagram of how this is supposed to be? All the air pump stuff is gone.

 

Picked up my new seat and a window regulator from Wayno yesterday, 9 hours of driving but it was worth it.

Also ordered all new window seals from Thailand, that was all i could find.



#38 wayno

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Posted 29 December 2017 - 08:31 PM

The PCV valve is connected to the intake manifold, the block vent should be connected to that PCV valve.

See the rusty PCV valve in this photo right below where the carb mounts, that is where that engine case vent connects on this intake manifold, the valve cover vent goes to the air filter housing.

DSCN0806.jpg


 

 


#39 rodjr

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Posted 29 December 2017 - 09:07 PM

Well that is just lovely.

My pcv is sticking vertical where the threaded vac fitting is in your pic. the crankcase vent is connected to the manifold directly with no valve!

NOT GOOD.  



#40 wayno

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Posted 29 December 2017 - 10:23 PM

Well that is just lovely.

My pcv is sticking vertical where the threaded vac fitting is in your pic. the crankcase vent is connected to the manifold directly with no valve!

NOT GOOD.  

 

That is not the best place for it, but plug the hole that the case is vented to now and connect the vent to the PCV valve, it will work there, but not the best place for it.

I would imagine you are having issues with your idle the way it is piped now.