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Coolant Banjo Bolt sealing woes on turbo. Any suggestions?


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#1 dpuma8

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Posted 01 December 2016 - 10:42 AM

I have a GT30 turbo and the coolant feed banjo bolt leaks.  I tried to anneal the copper washers that came with the bolt but it still leaks so I bought these washers that have rubber on the inside of them

 

http://www.torktekno...cummins-bs14mm/

 

Will these work or does the turbo get too hot to run these rubber washers so I need the copper ones?

 

 

 

 


1975 280Z L28E with Megasquirt II 3.57


#2 skirkland1980

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Posted 01 December 2016 - 07:45 PM

Mack trucks use those type washers for their turbo coolant supply on the mp7 and mp8 engines. Those you linked to show to be for fuel and may or maynot handle the heat. I have a dozen mack washers but they're 16mm.
:1983 280zx turbo, L28ET, custom cam grind, 96 saab 900 intercooler w/2.50" piping, 3" mandrel bent exhaust, megasquirt II v3.57, 540cc injectors, walbro gsl392 255lph fuel pump, aeromotive regulator, -6 supply lines, custom fuel rail, MSD ignition wires, MSD 8202 coil, homemade boost controller, Garrett TC4305 turbo, 70mm throttle body, Godzilla BOV, Turbonetics wastegate, custom intake, custom turbo header, Cooling Mist H2O/meth injection, 20psi boost, all stock body, stock interior and weld draglite wheels, TH350 trans 4000 stall with B&M 'street stick' shifter and hughes trans brake, nitto nt555R drag radials, best 1/8 mile of 7.53@ 98 mph

#3 softopz

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Posted 06 December 2016 - 05:45 AM

Definitely need copper washers ! You may want to take your banjo to a autoparts store find the tightest one you find it cannot be even a little bit loose. Auto parts store usually stock up on Raybestos copper brake washers they will do fine.



#4 Milenko2121

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Posted 06 December 2016 - 06:34 PM

I tried different washers and I got the copper crush washers(flat on one side, arched on other), no leaks ever since.


1977 280zt with '87 Z31t ECU, CLSD and S14 SR Transmission


#5 Tony D

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Posted 12 December 2016 - 09:08 PM

how did you anneal them, it's not the same as  annealing iron/steel... in fact, the process is the direct opposite!

 

To anneal copper you heat it red hot with a torch and then drop it in chilled water.

DIRECT opposite of annealing iron/steel alloys. If you let it air cool, you HARDENED the copper washer.

Don't know what you did, but thought for the record it might be helpful to point out this important difference.

I've annealed copper crush rings countless times and reused them. Rarely will I buy new anymore.


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#6 dpuma8

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Posted 14 December 2016 - 03:35 PM

I heated the copper rings until it got red and let it cool off.  That didn't work so I bought 10 new copper washers and it steal leaks ridiculously bad.  I have the copper washers on both sides of the bolt but it is always the same result.  The top crush washer leaks at a rate of a drip a second.  Can I use the rubber washer in place of the top crush ring that is further away from the turbo?

 

How tight do I need to tighten the fitting?  I have them tightened pretty tight and am afraid I will strip something if I go too hard.

 

Bought a new banjo bolt and more washers so let me see how that goes.


1975 280Z L28E with Megasquirt II 3.57


#7 Tony D

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Posted 14 December 2016 - 09:46 PM

^^^Yeah, that hardened the washer...

 

Crush Washers are very high pressure tolerant when clean. Make sure what you're assembling is clean clean clean, and torque the fittings properly to seat the banjo into the copper and the copper against the clean dry turbo machined surface.

I have seen turbos with the old crush washers stuck on them, where people tried to seal over another washer...doesn't work!

Blow everything off with contact or brake cleaner and watch exactly where the leak comes from...it may be from somewhere else and migrating to look like it is coming off the crush washer.


Misanthropic Anthroparion Class 5 Hoarder, aspiring to posthumous fame as my containers are cut open and the market floods with crap I've squirrelled away over the years! I endeavour to persevere...

#8 Chickenman

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Posted 16 December 2016 - 01:09 PM

For the water Banjo's you can use aluminum washers. Factory part on Euro turbo cars. Softer than most common Copper washers found at Napa, Autozone etc.



#9 HowlerMonkey

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Posted 23 January 2017 - 03:55 PM

I took a walk through the junkyard when I needed the proper length bolts and found many cars have the proper size (and longer/shorter) used for various coolers.

 

A 20 minute walk netted me 8 bolts and a bunch of washers.



#10 dpuma8

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Posted 03 February 2017 - 04:20 PM

I replaced the Banjo Bolt Hose fitting and added the aluminum washers a few weeks ago and no leaks.  Thanks for the advice.


1975 280Z L28E with Megasquirt II 3.57





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