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Need help reviving 521


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#21 racerx

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Posted 13 September 2017 - 05:19 PM

Whatever u do stay away from other brands besides koyo.

#22 Crashtd420

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Posted 13 September 2017 - 08:58 PM

Also watch the inlet size, when I bought mine I noticed places listing for the 521.. but they had a smaller diameter inlet.... not sure if those were for j motors or not.... best to measure what you have before you order to be certain...

#23 wayno

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Posted 13 September 2017 - 09:13 PM

Also watch the inlet size, when I bought mine I noticed places listing for the 521.. but they had a smaller diameter inlet.... not sure if those were for j motors or not.... best to measure what you have before you order to be certain...

J engines had the outlet/inlet on the opposite sides of the L engines, they are not interchangeable, "J" has the top connection on the right, bottom connection on the left like the SD series diesel engines, "L" block is top connection on the left(driverside), bottom connection on the right(pass side).


 

 


#24 Crashtd420

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Posted 13 September 2017 - 09:17 PM

Well just because I wanted to post the size of the Inlet and outlet i look up the radiators ... all seem to be correct now at 35mm or 1 3/8... I swear when I bought mine 2 years ago they were selling them with 1 1/2 outlet size.... must have been a bunch of complaints... oh well

#25 Crashtd420

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Posted 13 September 2017 - 09:23 PM

J engines had the outlet/inlet on the opposite sides of the L engines, they are not interchangeable, "J" has the top connection on the right, bottom connection on the left like the SD series diesel engines, "L" block is top connection on the left(driverside), bottom connection on the right(pass side).


Well if that's the case they were definitely selling the wrong stuff a year or so ago for the 521... I'm certain it was listed as 1 1/2 in and out because I almost bought it. I changed my order at the last second...

#26 wayno

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Posted 13 September 2017 - 09:35 PM

Well if that's the case they were definitely selling the wrong stuff a year or so ago for the 521... I'm certain it was listed as 1 1/2 in and out because I almost bought it. I changed my order at the last second...

 

The 521 came with both engines, late 68 and 69 thru Sept? had the J13 block, Sept 69 thru 1972 had the L16 block.


 

 


#27 gene knight

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Posted 13 September 2017 - 11:45 PM

my nephew had a 3 core aluminum radiator  made by blackworx in his 620 and it wasn't cheap it cost around $458 and it was made for a 350z, had to put hole in hood to get access to radiator cap



#28 Crashtd420

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Posted 14 September 2017 - 01:40 AM

The 521 came with both engines, late 68 and 69 thru Sept? had the J13 block, Sept 69 thru 1972 had the L16 block.


Thats what i thought but that doesn't explain why they would manufacturer a radiator for the L with 1-1/2 in and out if the j motors had it in different locations....
Long story short just make sure you check your old parts out before you order the new. I've seen things listed incorrectly like front wheel bearings and motor mounts and the manufacturer says it fits....

#29 Datsunking

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Posted 14 September 2017 - 05:36 AM

Ok thanks for the experience and info.

#30 Datsunking

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Posted 14 September 2017 - 05:38 AM

Also does anyone know the size of the high beams? Looking to buy the yellow looking headlights. If not i can measure when I get home.

#31 d.p

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Posted 14 September 2017 - 06:27 AM

Dunno the size but wagner 4412A will fit (have them on my truck).

 

36550122650_eb94e9e15c.jpg



#32 DanielC

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Posted 14 September 2017 - 06:29 AM

In the 1970's, almost all cars and trucks in the USA has either two 7 inch headlights, or four 5 3/4 inch headlights.  The low/high (outside) lights were 37.5/50 watt combo, and the high beam only were 37.5 watts.  SAE trade number on the high/lows is 4001, high beam only 4002.

 

There are many options in round headlights in the 5 3/4 inch size.  A lot of them are higher wattage than the stock headlights.  If you use a higher wattage lamps, a relay bypassing the headlight current past the original fuse box is a necessity.



#33 wayno

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Posted 14 September 2017 - 02:51 PM

Thats what i thought but that doesn't explain why they would manufacturer a radiator for the L with 1-1/2 in and out if the j motors had it in different locations....
Long story short just make sure you check your old parts out before you order the new. I've seen things listed incorrectly like front wheel bearings and motor mounts and the manufacturer says it fits....

All my 521 L block radiators have 1 1/2 inch inlets and outlets, the bottom one with a 90 degree bend, the J block had smaller inlets/outlets, they were closer to 1 1/4 inches, the top one might have been an 1 1/8th.

What size are your inlets/outlets on your L block radiator?


 

 


#34 Datsunking

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Posted 14 September 2017 - 05:37 PM

I have not measured the actual in and out but I guess I will have too.

#35 Datsunking

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Posted 14 September 2017 - 05:41 PM

On another note when I bought the truck the guy had a pair or BMW headlights that he planned on installing an never did. I found the thread about installing these o this site. But it talks about the 510 not 521. I have found that the 521 has a metal plate the separates the engine nay from headlights. Did they remove this in order to install or are 521 different in that way from 510 i would hate to cut up the datsun.

#36 thisismatt

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Posted 14 September 2017 - 05:57 PM

Right. They don't fit without hacking things up. Sell those to a 510 guy and buy some dapper lighting projectors which are shallower
I'm your huckleberry.

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#37 banzai510(hainz)

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Posted 14 September 2017 - 05:58 PM

no room for those type of lights


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

#38 Crashtd420

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Posted 14 September 2017 - 06:25 PM

All my 521 L block radiators have 1 1/2 inch inlets and outlets, the bottom one with a 90 degree bend, the J block had smaller inlets/outlets, they were closer to 1 1/4 inches, the top one might have been an 1 1/8th.
What size are your inlets/outlets on your L block radiator?


Ok I had myself alittle backwards... my radiator measured 35mm or 1.375....
Some of The radiators I saw were smaller, i ment to say I saw 32mm or 1.25...
I don't know where i got the 1 1/2...

#39 DanielC

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Posted 14 September 2017 - 08:40 PM

I believe on a 510, the whole headlight bucket in the radiator core support is inside the engine bay.

On a 521, about 2/3 of the core support headlight bucket is inside the fender, outside of the engine bay.  Any cuts, or holes in the 521 headlight bucket will allow road grime from the tires to be thrown on to the headlights.



#40 datzenmike

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Posted 15 September 2017 - 11:40 AM

Clogged rad is almost always hard water deposits like the inside of an electric kettle. Take rad out and face the inlet/outlet up. Buy a jug of CLR . Pour in an top up with water. Every few hours shake it around a bit. I did mine but couldn't get to it for 3 days. No harm done and clean as a whistle.

 

The water here has very little dissolved minerals. Always top up with distilled water. And get a coolant recovery system installed. This will save your coolant from spitting out after shut downs and virtually eliminate topping up the rad.


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