727 dipstick tube leak

[oldkimmer]

The transmission will leak a quart or more of oil when you pull the dipstick tube. The dipstick is usually secured just to the rear of the exhaust manifold on the back of the engine by a strap to the tube. Sometimes this strap gets bent upward and no longer provides a good contact with the tube where it goes into the transmission. Usually it is best to replace the o-ring when removing the tube. If necessary, you can also replace the o-ring with a thicker unit to get a better seal. It is difficult to get a good seal with RTV with oil still in the transmission.

Dave

I never once seen the tube bolted to the exhaust manifold. Kim

 

[70bigblockdodge]

I tried the correct o-ring, in my case it did not work. The locking dipstick with its gromet style seal worked.

View attachment 206163

@MEV
Where did you get that?
@Knebel
O ring with a small amount of rtv for good measure. Put the right front up on a ramp, less fluid running out on ground.

 

[MEV]

@MEV
Where did you get that?
@Knebel
O ring with a small amount of rtv for good measure. Put the right front up on a ramp, less fluid running out on ground.

Summitracing. Make sure you specify small or bigblock, they have several. I think jegs sells them too.