Leak at gear cooler

[Eric Johnson]

Hi Tony and all,

I have a question regarding the connection of the hydraulic lines coming from the gear (ZF gear to the oil cooler on a Cummins QSB 6.7). I have a leak at the supply line connection to the gear cooler. I have 1/2 inch male-male coupling which has a tapered thread for the hose and a strait thread for the gear cooler and it is the strait thread that is leaking. I have tried Rectorseal 5 but it still leaks. The strait thread of the coupling, 1 inch long, is threaded completely into the gear cooler, ie it is bottomed out, and is close to the temperature sensor which is strait opposite. Two questions:

1. Is it normal for the coupling to thread into the gear cooler the entire length? 1 inch.

2. Is there a preferred or better sealant to use?

Topic

[Tony Athens]

QSB 6.7 Gear cooler fittings

Things like this used to be simple.. No longer——————-Enter a “just of of school” couch engineer.. Now you are dealing with STORM fittings / threads on the gear oil cooler..

In your case, 22mm STORM—-“STRAIGHT THREAD O-RING METRIC”. The “sensor ports” as 14MM STORM.

You are most likely missing the captive O-Ring washer..

We use “BLUE” Rectorseal

[Author]

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