transmission oil cooler hose: torque for the jam nut on 90 degree fitting

[Plasa]

transmission oil cooler hose: torque for the jam nut on 90 degree fitting: SOLVED

Hello forum.
One of my jam nut on the 90 degree fitting got loose and I lost some oil between transmission chase and 90 degree fitting. The steps to change the trans oil cooling pipes are in TM 9-2320-365-20-3 on page 697, but there is no torque indication. Only the torque for the hose is indicated: 94-104 lb-ft.
Do someone know the torque to tighten the jam nut?

I would not like to overclose the nut and to damage the transmission chase...

Thank you a lot and sorry for my bad tecnical english...

Christian from Italy!

 

[Ronmar]

They don’t even list a torque spec for it in the transmission replacement procedure where you remove and install those fittings from the transmission case. I would say snug enough so you cannot rotate the fitting when pushing on the hose fitting...

 

[Plasa]

They don’t even list a torque spec for it in the transmission replacement procedure where you remove and install those fittings from the transmission case. I would say snug enough so you cannot rotate the fitting when pushing on the hose fitting...

OK. Thank you.
The problem is that I am loosing oil right there, and I don't know how much can I tighten. Seems that would be a trial and error procedure...
Christian

 

[Suprman]

90 degree fitting at the trans going to the oil cooler? The trans side of the elbow has an o ring. You can probably replace with a generic. The newer style ones also have an o ring on the flare side. If its leaking there and your elbow dosnt have the o ring in a groove on the flare then you can get a flare seal copper gasket to put in between the line and the fitting. The metal trans cooler lines can get hairline cracks at the flare and leak.

 

[aleigh]

The hairline cracks suprman mentioned happened to me on a big trip to Seattle. Hydro shop in Flagstaff cut the end off, grafted another one on with a sort of female to female splice, and I was back on the road same day. I have no idea what torque they used, I think the german gutentight...

 

[Plasa]

Hello!
The solution was simple: I tighten the nut between transmission case and fitting and leak stopped. Now OK for 300 miles.

Thanks for the support!

Christian

 

[Plasa]

Happened today, 1000km from home. Frame and rear axle is full of oil, what a nightmare! Now I need to find some hydraulic hose shop to get 2 flexible ones... Loose about 2 liter of oil.

Of course on weekend, no one is working...

BTW: are the original hoses of aluminium or steel?

Christian

90 degree fitting at the trans going to the oil cooler? The trans side of the elbow has an o ring. You can probably replace with a generic. The newer style ones also have an o ring on the flare side. If its leaking there and your elbow dosnt have the o ring in a groove on the flare then you can get a flare seal copper gasket to put in between the line and the fitting. The metal trans cooler lines can get hairline cracks at the flare and leak.

 

[f8617]

I had temporary 1-inch diameter hoses made by my local hydraulic hose shop, cost ~$70 each.

 

[Plasa]

Thank you! That I think is the best way to solve! Do you remember what kind of attachment they had? Jig or flat?

 

[f8617]

Don't drain your tranny, just pull the hoses off (only ~1-2quarts of oil will come out at the hose end/cooler), and take them to the hydraulic shop

 

[Plasa]

Awesome! That's a good tip! Thank you very much!
Do you have a picture also of the other side of the hose?

Christian

Don't drain your tranny, just pull the hoses off (only ~1-2quarts of oil will come out at the hose end/cooler), and take them to the hydraulic shop
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