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  #1  
Old 09-20-2009, 02:30 PM
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problem with B2 piston cover seal (orange one)

picked up a 83 300sd with the classic B2 piston symptoms. No forward but reverse perfect. Further inspection shows the tranny was rebuilt at one time. When I pulled the B-2 out it was fine and was the updated one. It also has the white plastic bushing installed instead of the aluminum one. I did find a piece of the old orange cover seal in there so i was figuring it jammed the piston and was the problem. I cleaned it all out using a seal pick and replaced the seal with a new one. The problem I am now having is that the orange seal keeps blowing out. I put the new orange seal in the groove and even put a dab of vaseline around it and push the cover in only enough to insert the "C" clip. When I start the car as soon as I put it in drive I hear the hissing sound and when I look a part of the new "O" ring squeezed outside the cover and fluid pushed out. This has now happened 3 times. Any ideas what I am doing wrong? Am I pushing the B-2 piston in too far and when I start it it is slamming against the cover? Any thoughts? thanks Mike

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Old 09-20-2009, 06:01 PM
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Could the bore be worn too much? Is it possible the seal is not the correct size, maybe you didn't get what you tried to buy? Just thinking of simple stuff. BTW, I noticed the Travelall in your signature, how does the 617 do in something that heavy?
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  #3  
Old 09-20-2009, 06:14 PM
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I've had the same issue as well. I eventually gave up on the tranny and got another. I later had the tranny on the floor upside down. I pulled the filter and valve body off and noticed it looked as if the fork of the band and where the part where thrust pin engages along with another brake ban part was not lined up. I never tried reinstalling the tranny to see if this would solved the problem. You may want to check this on your tranny. Pushing back on the part where the thrust pin engages may have caused these parts to misalign. It seems like these parts take extra special care to reassemble correctly, especially when the tranny is in the car.
I am curious if the same has not happened to you.
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 09-20-2009, 08:44 PM
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Maybe you could bolster the o-ring with some RTV, make it a bit thicker. In that case, I would hold the cover in place with some sort of contraption (when I did it, a piece of copper pipe worked fine!) and seal the outside edge of the lip and put the o-ring in. That would seal it and keep it in place, but you'd have to be absolutely positive that the RTV is dry and bonded before driving anywhere.
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Old 09-20-2009, 10:30 PM
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There isn't much room to bolster the seal. It's a tight fit as it is, at least mine was. I even put a new O-ring and it squirted out like the old one. I believe there's more to it than the seal.
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 09-21-2009, 07:20 AM
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thankyou for the replies guys. I am going to pull the valve body down and inspect. Once I do I will report back. I still feel that the initial cause of the tranny failure was the broken piece of the old rubber o ring jamming the B-2.
Mike
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Old 09-21-2009, 04:30 PM
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Quote:
Originally Posted by westkill View Post
thankyou for the replies guys. I am going to pull the valve body down and inspect. Once I do I will report back. I still feel that the initial cause of the tranny failure was the broken piece of the old rubber o ring jamming the B-2.Mike
That could definitely cause grief in the tranny. The trick is getting the small rod back in place w/o it falling into the pan and lined up with the B-2 band. With the pan and valve body out of the way this should be easy.
A manual like one from ATSG can help visualize things and how they go back together.

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