Originally Posted by
Epstein
Yeesh. How did I know the links to the other forums would be wrong.
OK. The general information.
The double male fittings that go into the block and turbo center section... These are called "metric to AN adapters". That's because they're AN on one side (the flared side), and they're Metric on the other. This is what you're using on the coolant lines. The metric side goes into the block and turbo. They seal with a crush washer betwen the adapter and the block/turbo. These are usually copper, but yours are aluminum. These do not require teflon tape anywhere.
The banjo fitting is the one with the big hole in the middle. This seals to the block with a crush washer on each side. The banjo bolt goes through the middle. So it should be Block | crush washer | banjo fitting | crush washer | banjo bolt. This is used on the oil line where it attaches to the block. These do not require teflon tape.
The last kind of fitting that you have is an inverse flare fitting. That's the other end of your oil line (that goes into the top of your center section). Techincally this is an inverse flare (IF) to AN adapter. The taper you see on the inside of the fitting will mate with the inverse of this on the turbo. You do not use teflon tape here.
Now about sealing. There are 3 ways to seal something. First is a crush washer. This is what Nissan uses all over the place on turbos. The copper or aluminum is forced to conform with the 2 opposite surfaces, which seals them together. They also make one with an oring inside the crush washer. These are used on fitting with straight threads (SAE or Metric). The second type is the pipe fitting. These have tapered threads and use teflon tape to seal. Because they are tapered they will bind, and they use this binding to seal. The teflon tape fills in the small gaps. There are no pipe fittings in these turbo lines. The third type of fitting is a flare. This includes AN fittings that are flared to 37* as well as all other flares that are usually at 45*. By forcing these 2 surfaces together, a seal is formed. No teflon tape is used here.
Armed with this knowledge plus righty-tighty, lefty-loosey, you should be able to install these lines.
Thanks a lot for the info man, got to it too late though. I used teflon on all 4 of the metric fittings for the coolant feed/return, and i even used teflon on the inverse flare fitting for the oil feed at the turbo
.
Started the car up and in 10 seconds leaked a pint of oil out of oil feed line at the block. I don't think the aluminum crush washers they supply you with are worth a damn. I have it tightened down pretty snug. What do i do now??
*all the other fittings aren't leaking from that brief 10 seconds of running
