banzai510(hainz) Posted September 22, 2020 Report Share Posted September 22, 2020 whats the fix for the 521 heater hose from head to heater . Mine popped yesterday but lucky I caught it. I just shortened the hose ans reclamped it back on. What have people don't to fix this since I was told the stock hoses are NLA. Don't know How true that is but was told that by my local dealer. I seen people use exeisting ones if someone has part numbers Thanks. the end sizes are slightly different. the head elbow size is bigger than the heater core inlet 1 Quote Link to comment
yenpit Posted September 22, 2020 Report Share Posted September 22, 2020 If 5/8 hose (like 510), I have used a Dayco 80407 for the preformed 90deg on one end, then you end up with 2+ feet of 5/8 straight for another project! I just looked at my 521, looks like you need an "S" shaped hose, which you could buy qty 2 of Dayco 80407, use the 2 90deg preformed ends, use a connector in between to create an "S", but that's too many hose clamps for me! I would think that there is an "S" hose that somebody else might suggest! Following! I just read that you think the cyl head elbow vs the heater core tube are different sizes.........?? Ugh 😣 that complicates things! 1 Quote Link to comment
DanielC Posted September 23, 2020 Report Share Posted September 23, 2020 A four seasons 84743 heater fitting is a Steel fitting 1/2 on one side, and 9/16 on the other 1 Quote Link to comment
mainer311 Posted September 23, 2020 Report Share Posted September 23, 2020 (edited) Gates 18077 can be used for heater to timing cover nipple. One end is 5/8 and the other end is 3/4. Not great, but it works if you over-tighten the heater end. The PO of my truck did the same thing with the other hose, but there’s no P/N. Or, you can try this: Edited September 23, 2020 by mainer311 1 Quote Link to comment
banzai510(hainz) Posted September 23, 2020 Author Report Share Posted September 23, 2020 (edited) thanks. the s shaped hose whats the part number that. the link says 1847 but is like missing a number or something. No spilces I like that. Edited September 23, 2020 by banzai510(hainz) 1 Quote Link to comment
MikeRL411 Posted September 23, 2020 Report Share Posted September 23, 2020 (edited) On 9/22/2020 at 6:36 AM, banzai510(hainz) said: whats the fix for the 521 heater hose from head to heater . Mine popped yesterday but lucky I caught it. I just shortened the hose ans reclamped it back on. What have people don't to fix this since I was told the stock hoses are NLA. Don't know How true that is but was told that by my local dealer. I seen people use exeisting ones if someone has part numbers Thanks. the end sizes are slightly different. the head elbow size is bigger than the heater core inlet Not sure it's the same fitting but in the "how to" section I posted a heater hose from firewall to engine block hoses build including part numbers and SKU tag ID. Use search function in How To to find. Readily available parts plus a little cut and brass splices and you will look factory and more important, you will work! Title DIY Heater Hose, 10 Sept 2010. easy search. Edited September 23, 2020 by MikeRL411 added reference data. 1 Quote Link to comment
banzai510(hainz) Posted September 23, 2020 Author Report Share Posted September 23, 2020 I have 2 spares of the long ones its the "S "shaped ones that always go bad first. be it the 510 or the 521 plus doing a few motor pulls don't help either 1 Quote Link to comment
mainer311 Posted September 23, 2020 Report Share Posted September 23, 2020 (edited) In the link I posted above, he used an 18457 for both of them, you just cut them differently depending on what hose you're replacing. Here's the picture for the short "S" one: Edited September 23, 2020 by mainer311 2 Quote Link to comment
banzai510(hainz) Posted September 23, 2020 Author Report Share Posted September 23, 2020 GOT IT! THANKSSSSSSSSS 1 Quote Link to comment
yenpit Posted September 23, 2020 Report Share Posted September 23, 2020 1 hour ago, mainer311 said: In the link I posted above, he used an 18457 for both of them, you just cut them differently depending on what hose you're replacing. Here's the picture for the short "S" one: There it is!! 😎 I'm grabbing a couple of these, one to replace on my 521 & another as a spare to keep around! 3 Quote Link to comment
fiveoneO Posted November 26, 2020 Report Share Posted November 26, 2020 Thank You so much for this! I just picked up a 521 and I'm in need of this hose. Quote Link to comment
Crashtd420 Posted November 26, 2020 Report Share Posted November 26, 2020 I know for a fact a member here, kenp19, has a few of both the heater hoses, oem for sale.... Quote Link to comment
bilzbobaggins Posted November 26, 2020 Report Share Posted November 26, 2020 9 minutes ago, Crashtd420 said: I know for a fact a member here, kenp19, has a few of both the heater hoses, oem for sale.... Braided or just rubber? Quote Link to comment
DanielC Posted November 26, 2020 Report Share Posted November 26, 2020 The hoses on my 521 are 1/2 inch at the heater, the engine connections are 14 MM. Datsun 521 trucks use Imperial measurements on the body, and metric on the engine. fiveoneO remember this. Body bolts on the 521 are all SAE, 7/16-20, 3/8-24, 5/16-24, 1/4--28, 10-32, 8-32. I have had 521 trucks since the 1970's, and have two currently running and registered. See these threads. https://ratsun.net/topic/49698-my-dragon-datsun-521/ https://ratsun.net/topic/30606-my-ratsun-datsun-521-now-with-l-20-b-and-a-five-speed/ 1 Quote Link to comment
Crashtd420 Posted November 26, 2020 Report Share Posted November 26, 2020 1 hour ago, bilzbobaggins said: Braided or just rubber? I guess it would be considered braided.... Whatever oem was.... 1 Quote Link to comment
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