Re: 601 oil leakage from hydraulic sump to transmission

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Posted by TheOldHokie on May 29, 2018 at 08:38:15 [URL] [DELETE] :

In Reply to: Re: 601 oil leakage from hydraulic sump to transmission posted by Ultradog MN on May 29, 2018 at 07:56:35:

This has been beat to death on the forums. From an old 2007 post:

The tube came out with a marking of NCA 945 B. I dont know if that makes it an original or not. The specs John Smith gave me on the tube were off by a little and incomplete. I'll post mine for reference.

The tube is .500 inch OD steel tubing 26 11/16ths inches (he said 26.5) in length. The wall of the tube appears to be slightly less than 1/16th thick, it would have to be to allow sleeving with a 10mm OD tube. I cant measure it accurately without hacking the tube but since 10mm is 0.393 im assuming the ID is .400 and therefore the wall thickness is .050. The front inch is .505, the next 14.5 inches are .500, 15.5 inches from the front the tube tapers to .495 for one inch, then down to .490 until 25 1/4 inches from the front it is turned down to .485 for the last 1 7/16ths inches.

John's instructions are to turn the tube down to .485 all the way after the .495 section. He also didnt record the distance from the front to start turning the center section. Since the wall is only .050 thickness I plan to follow the tube in hand and keep as much steel as possible. My leak was right at 25 inches from the front.

The tube goes through different diameter holes in the internal walls of the sump and has to be removed and installed from the front. If you are going to replace it probably easiest to tap threads in that end of the tube and use a puller to remove it. That may or may not require a transmission/engine split depending on what sort of obstructions you have to deal with. IIRC John Smith's site had a tutorial on the tube and its R&R.


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