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My 1971 521


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#1 d.p

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Posted 12 November 2016 - 09:02 AM

Hi, new to the forum and new to buying a 521 but long time fan looking for one.  

 

Anyways I looked at one today that was in good shape, drove and stopped very well, little rust, interior was solid, bed was solid, couple dents but all in all a good truck. Seller told me the oil sending unit was replaced recently but looking under the truck there was oil and sludge all around the sending unit, dipstick and drain plug.  I wasn't sure why that was and I would have thought that would have been cleaned up when they replaced the sending unit or its leaking somewhere else.  Also the rear end was leaking.  I am wondering whether either of these I should be concerned about?  Tried to post pics but keep saying "you are not allowed to use that image extension on this community."

 

Link here:  https://goo.gl/photo...7EuBaFtwJ6td4w6

 

 

EDIT:  Bought it.

 

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#2 kelowg

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Posted 12 November 2016 - 12:50 PM

Most look that way. valve cover and pan gasket leaks r common. rear end is pretty ez fix, as long as oil doesnt get low wont hurt anything tho



#3 thisismatt

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Posted 12 November 2016 - 12:56 PM

The only Datsun that isn't leaking is the one that's out of oil
I'm your huckleberry.

One jump ahead of the lawmen
That's all, and that's no joke
These guys don't appreciate I'm broke

#4 d.p

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Posted 12 November 2016 - 12:58 PM

Puts my mind at ease, thank guys.   Whats the fix for the rear?

 

Fingers crossed this works out and I am a proud new owner.  



#5 banzai510(hainz)

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Posted 12 November 2016 - 01:07 PM

olddatsuns.com read the tech section. specs articles and vids

 

most 521s the Kingspins are most liely worn out. autozaon ahs them for 144 then need to give a shop that knows how to do them(most cant do it right)

 

all leak by now(park on gravel driveway as I do.

 

put your location where you live.


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

#6 d.p

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Posted 12 November 2016 - 01:20 PM

I am in the Mid-Atlantic, outside of DC.  

 

I was looking at that site but a lot of the links are dead, the two for the king pins are definitely DOA. 



#7 datzenmike

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Posted 12 November 2016 - 04:34 PM

(picture of differential)

 

Normal. If front at the driveshaft is wet the pinion seal may need replacing. In any case if you buy be sure to empty and replace the differential oil with GL-5 80w90. There's no telling when it was replaced last. Should be checked every 15K and changed every 30K miles.

 

(picture of front trans and engine oil pan)

 

Looks like caked on dirt not wet with oil. This will power wash off. If there were fresh drips I would be more concerned.

 

 

(picture of transmission underside)

 

Bottom transmission pan is clean and any oil has transferred back from the engine by the wind. Again replace the transmission oil with GL-4 80w90 NOT GL-5. Check every 15K and change every 30K miles.

 

 

(picture of valve cover and starter)

 

Hard to tell. If dipstick has lost the rubber seal blow-by will wet the block nearby. Oil senders can sometimes weep oil. The fuel pump should have two gaskets and a plastic spacer between them. These can leak and also the pivot pin on the pump body. Best to power wash and de-grease with brake cleaner and watch for wetness... then fix. 

 

Over all I would just replace the valve cover gasket the biggest and most likely cause of an oil leak.

 

Last is the crank pulley seal. These get old and drip and the fan and normal air blowing past spreads it over the engine. Check behind the crank pulley for wetness or a drip. But do the valve cover first as oil flows down hill.


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#8 Charlie69

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Posted 12 November 2016 - 07:10 PM

Welcome,  you have to remember you are looking at a 40 plus yearold truck.  These leaks are common and when you buy it you can address the leaks.



#9 d.p

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Posted 13 November 2016 - 06:33 AM

True but being new to them I figured I might as well get some advice from the pros.  



#10 DanielC

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Posted 13 November 2016 - 08:22 AM

Datsun L-engine use British pipe threads on pipe fittings on the engine.  They are different from the threads used on domestic engines.  NPT will start to thread in to the engine but not seal.

Go to a Nissan dealer, and get an oil pressure switch with the proper threads.



#11 racerx

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Posted 13 November 2016 - 11:17 AM

Have u done a compression check?

#12 d.p

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Posted 13 November 2016 - 11:31 AM

IIRC 125 in #1 and 145 in the other 3.

#13 racerx

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Posted 13 November 2016 - 11:48 AM

When u did comression was engine warmed up and throttle wide open and did u use screw type of tester.

#14 d.p

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Posted 13 November 2016 - 12:18 PM

When u did comression was engine warmed up and throttle wide open and did u use screw type of tester.

Nah, seller did it and told me the results.  Like I said the truck started and drove without issue so I took his word for it.   The only thing I noticed was a slight hesitation around 65MPH on the freeway but cruising around it was fine. 



#15 racerx

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Posted 13 November 2016 - 08:58 PM

I would still check.

#16 d.p

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Posted 14 November 2016 - 01:38 PM

Bought it and I am pumped!  Guess this truck was on here in a past life, owned by Patd: http://community.rat...ser/4071-patd/ , sold to dubdlux and now owned by me.  What goes around comes around I guess.  

 

Some questions..

1. If I re-index do I need blocks in the rear too?

2. 6 chevy blazer rally wheels fit on a 521?  15x8 but no idea on the offsets.  



#17 d.p

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Posted 15 November 2016 - 01:39 PM

Bought this from BAT, was owned a long time ago by @patd who sold it to dubdlux who then put it on BAT.     

 

Got it home today, ran damn well, some slight vibration at speed on the freeway but it hummed along at 65-70 although the speed said I was going 80.  In attempt to get the hub caps off I nearly broke my finger, seems like they have been on there a long time.  Previous owner did a fair amount of maintenance with very little miles over the past 6 years.

 

  1. New water pump, thermostat, and heater hoses (2010)
  2. New seals including rear main, timing cover, valve cover, valve stem, and oil pan (2010)
  3. New clutch with resurfaced flywheel (2010)
  4. New muffler and tailpipe (2010)
  5. New brake shoes all around, drums, wheel cylinders, return springs, and hoses (2011)
  6. New battery (2015)
  7. New oil pressure switch (2016)
  8. New spark plugs (2016)
  9. New front main seal (2016)

 

Short list of stuff I would like to do

  1. Get cigarette lighter working, its disconnected not sure why.  There is black wire w/plastic sleeve hanging behind it but no Lg/r wire that I can see.  
  2. Fuse for dash lights needs to be reset (taken out and put back in) once they stop working.  Not sure why that is?
  3. Dome light doesn't work
  4. Radio doesn't work
  5. Lower it
  6. Get some rally wheels pc'd white
  7. Yellow fogs film/tint on high beams
  8. Fix vibration on freeway
  9. Replace rear view mirror
  10. Line-x bed

 

 

Pics for clicks

 

 

25372216839_a3a301b236_z.jpg

 

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#18 banzai510(hainz)

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Posted 15 November 2016 - 02:50 PM

Fuck a side shot might look even better but thats a awsome color!!!!!!!!!!!!!!!

 

 

pull that BMW out of the garage and put this in there


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

#19 d.p

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Posted 15 November 2016 - 03:24 PM

Here you go pre-hubcap removal.  Fuck moving my other car out, right now the Datsun is relegated to the driveway alongside my lady's mini.  

 

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#20 dubdlux

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Posted 15 November 2016 - 03:27 PM

Glad you made it home ok!  The easiest way to get the hub caps off is using the flat end of the lug wrench.  Those button hubcaps stick like glue.  

 

MS