BUILD THREAD 81 Buick/Olds Turbo Wagon 02/15/2024 More Parts!

[liquidh8]

Took it all back apart, checked the iron support rings and the teflon scarf seals on the input drum.

When I check that hole on the input drum the piston pops up, but I get air out of the cooler line and the center hole of the input shaft. I'm not sure this is supposed to happen?

I checked it all before assembly, I dont Remember that happening.

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[liquidh8]

So after so.e careful inspection, it's the teflon rings leaking some air. I've read a ton of threads and it seems to be common when bench checking with air. The piston pops up and down no issues.

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[fleming442]

So, they'll seal with fluid? Can you wet them and the bore to make it work?

 

[liquidh8]

So, they'll seal with fluid? Can you wet them and the bore to make it work?

I was reading, even in the ckp book, that they leak. I hit a few threads and chris chimed in, where he said pack the groove as with grease and leak check k to ensure there were no other leaks, I did and it was fine. So those teflon seals leak. I even stole the solid seals from the Input shaft, and not really better at all.

So, I measured all the seals, i had 6 laying around, and used the thickest. It's much better, but still leaks some air.

I am now on the front selective behind the pump. I have a total of .036", minus the other measurement (I wrote it down) and I have. 010" with the yellow washer. The ckp book calls for .003 to .006. So I ow need to get a thicker washer it seams.

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[liquidh8]

So I ordered a new yellow, and a light blue from ckp to take up .005" play. My yellow is on the thin side and a bit black looking. I could probably get away with the
010" play, but I managed to get this far making everything in spec for the ckp manual. ATSG spec's are broader and looser.

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[liquidh8]

Revisited the trans, got the light blue washer in there, gave me the .006" total I need.

Torqued the front pump down, the governor housing, and a few other odds. Now, I have to yank the trans in the car out to get the valvebody.

Then final assemble and install.

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[liquidh8]

Pics

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[TURNA]

Cleanest trans I ever seen!

 

[81cutlass]

You don't have in your books what lengths GM made for servo pins you have do you?

I have an 84/85 GN servo in my turbo wagon and it flares the 1-2 shift bad. Im sure the band is wore but im kinda band aiding it. Hope that if I dial it into .060 or so I can tighten the 1-2 shift up a bit.

Checked the clearance on the servo piston last night and it was like .13-.15", its supposed to be .06-.1" from what I read. That align with what your doing?

I have a 3 groove servo pin now and I know they have 1 and 2 groove pins that are either shorter or longer. I might just weld .06" or so onto the tip of the pin and regrind it.

 

[liquidh8]

You don't have in your books what lengths GM made for servo pins you have do you?

I have an 84/85 GN servo in my turbo wagon and it flares the 1-2 shift bad. Im sure the band is wore but im kinda band aiding it. Hope that if I dial it into .060 or so I can tighten the 1-2 shift up a bit.

Checked the clearance on the servo piston last night and it was like .13-.15", its supposed to be .06-.1" from what I read. That align with what your doing?

I have a 3 groove servo pin now and I know they have 1 and 2 groove pins that are either shorter or longer. I might just weld .06" or so onto the tip of the pin and regrind it.

I dont have the pin lengths, but, you should shoot for .060" with a stock style servo. I have the CKP billet servo, and the instructions called for a larger clearance, .120" if I recall. .13-.15 is huge. There are also pin extenders you could use, but welding some metal on the tip is cheaper.

I have welded material onto the tip before, with no I'll effects. It's possible your band is wearing, or maybe a broken cushion spring in the 1-2 accumulator.

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