EVO All Evo Model Discussion

Medium well done primary

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Old May 23, 2019 | 11:54 PM
  #31  
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They also make a full on gasket for the engine-primary mating surfaces, that replaces the O-ring. I have one on standby on my shelf. Pricey at $30.

What the dealership does to prevent leaking is puts a bead of rtv around the external primary bolt mating points. Then they put a thin strip of it on each bolt as it's inserted and torque to spec from there. Makes for hell to clean up but didn't ever leak for the life of me.

As far as I am aware of - the only difference between the pre and post 94 trans output shaft seals is that the later models have 1 o-ring, which seals agains the metal spacer, and an oil seal that you can push back in with your fingers, tilt it, remove and push the new one in with your fingers too after lubing the outside edge. If I was in there I'd drop in the aluminum pulley too. That steel OEM one weighs like 15-20lbs and the aluminum one is like 5lbs.
 

Last edited by avenger09123; May 24, 2019 at 12:01 AM.
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Old May 24, 2019 | 06:56 AM
  #32  
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Originally Posted by avenger09123
They also make a full on gasket for the engine-primary mating surfaces, that replaces the O-ring. I have one on standby on my shelf. Pricey at $30.

What the dealership does to prevent leaking is puts a bead of rtv around the external primary bolt mating points. Then they put a thin strip of it on each bolt as it's inserted and torque to spec from there. Makes for hell to clean up but didn't ever leak for the life of me.

As far as I am aware of - the only difference between the pre and post 94 trans output shaft seals is that the later models have 1 o-ring, which seals agains the metal spacer, and an oil seal that you can push back in with your fingers, tilt it, remove and push the new one in with your fingers too after lubing the outside edge. If I was in there I'd drop in the aluminum pulley too. That steel OEM one weighs like 15-20lbs and the aluminum one is like 5lbs.
Yes, thanks for that info, forgot about the sprocket lock bolts, but found a local source for those, ended up ordering the baker hardened spacer and the matching seal. Borrowed an electric impact for the sprocket nut. Will start taking things apart this weekend. Gonna take my time.

I need to do a fix for the weeping stator rubber where the connection is made at the block. I plan on cutting and splicing in new wire, filling the hole in the block with silicone and make an external inline connector like on the newer models. The stator is fine, it's just the rubber that weeps. Kind of sucks as the stator is not that old.

Those bolts that pass thru the inner primary have my attention also. I plan on silicone sealing the inner primary to engine block and inner primary to transmission contact points (where the bolts pass thru open holes), but also plan on some silicone under the bolt heads (at the locking tabs) just before I draw the bolts tight with final torque.

Also plan on a little hylomar on the large engine to primary O-ring. Thanks again, YD
 

Last edited by Yankee Dog; May 24, 2019 at 07:06 AM.
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Old May 24, 2019 | 09:17 PM
  #33  
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I sealed mine up yesterday. Used black RTV. I wiped on a thin amount of sealer on each surface, then slipped the big O ring in place. I also used RTV on the bolt threads. We'll see if it holds tomorrow afternoon.


carl
 
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Old May 25, 2019 | 08:38 PM
  #34  
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Glad you got it all back together...wish I could say that...

I managed to get everything taken apart today. Pretty uneventful and took my time. It was a good day for it. Rain on and off with muggy weather in between.

Sprocket/pulley nut came off with no problem using the borrowed electric impact. Gotta get me one of those. Had more trouble getting the compensator off. I used the wedge thingy but the primary chain was lifting to high for my liking so I made a locking bar. Once the proper length locking bar was in place, it came off easy with a 24 inch breaker bar. 8 1/2 inch long locking bar seemed to fit the best.

Looks like my inner primary seal is what was leaking and the large seal that goes over the sprocket spacer is weeping. Got everything cleaned up and at a stand still. "delivery by Saturday" did not happen so hurry up and wait.

While I'm waiting, I'm gonna try and work out the weeping stator wire/grommet seal issue, and replace things like the shift shaft seal, jackshaft seal, etc. Just little details till the rest of my parts show up. YD
 
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Old May 26, 2019 | 10:26 AM
  #35  
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Looks like my pulley nut and retaining plate failed and I had some movement to the pulley/sprocket. I assume the pulley nut should not be carved out like that, as well as the wear/damage to the locking retaining plate and sprocket.

Funny, the only oil I noticed was primary oil. I know what the trans fluid smells like and other than gunk build up, there was no trans fluid leaking,



 
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Old May 26, 2019 | 10:55 AM
  #36  
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Splines look good though. A new nut and retainer and your good to go there..
 
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Old May 26, 2019 | 11:09 AM
  #37  
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Never seen one of those fail unless there were other issues in play , check everything closely.
 
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Old May 26, 2019 | 12:02 PM
  #38  
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TwiZted Biker: "Never seen one of those fail unless there were other issues in play , check everything closely."

It's got me wondering also...spacer at the mating surface to the sprocket show some damage as well. Grabbing the shaft while it is apart and really trying to get some movement and there is no noticeable bearing play.

The old quad seal, old spacer and outside spacer seal are still in place (while I wait for replacements) when I tried checking for shaft and bearing play/movement. Is there something specific I need check while I am waiting?

Replacing quad seal, spacer, large seal outside of spacer, main drive gear seal, sprocket/pulley, nut, retaining ring and retaining ring bolts and belt.

So am I leaving anything out with regards to that shaft?




98hotrodfatboy: "Splines look good though. A new nut and retainer and your good to go there.."

Above is a different pic (backside) of the pulley, notice the wear to the splines and then at the very back portion of the splines in the pic (which would be the front nut side of the pulley), there is unworn area of splines. Almost like the pulley was never seated completely on the shaft.

The first thing I checked after I noticed this issue was the shaft splines...The pulley splines have wear, but not the shaft splines. The nut came off pretty easy during removal, but then again I was using an electric impact so can't say for sure how tough it was. The impact did labor a little, but nothing crazy.

Again any ideas what the issue was? Like a tight belt or something? Anything else to check out while I'm at this? YD
 

Last edited by Yankee Dog; May 26, 2019 at 12:09 PM.
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Old May 26, 2019 | 06:00 PM
  #39  
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That picture tells a different story...

Did the screws that hold the nut retainer loosen up and evtually back out all the way?
 

Last edited by 98hotrodfatboy; May 26, 2019 at 06:01 PM.
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Old May 26, 2019 | 06:09 PM
  #40  
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Spline in that sprocket is very worn , you can see the deformation of the tooth profile it's lost about 20% of it, there would have been vibration there which could account for the wear I see on the back side. Combined that enough to loosen the nut if it wasn't 100% correctly torqued down with a dab of loctite which I didn't see either.

Replace that sprocket and the spacer behind it both.
 

Last edited by TwiZted Biker; May 26, 2019 at 06:10 PM.
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