Replace gear's engagement/dog ring
02-14-2018, 12:08 AM
#1
Cruisin'
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Replace gear's engagement/dog ring
The engagement ring (or whatever it's called) split on my manual transmission's 4th gear. That made it easy to get the old one off the gear at least. 
I got a new ring, but I'm having trouble getting it on. I assume I need to press it onto the gear, but it doesn't feel like it wants to go on. Since my old one cracked and it isn't the biggest hunk of metal I'm scared to force it. It isn't the cheapest piece of steel and I don't want to have to buy another one. Has anyone done this? Is there any trick, or is it simple brute force?
Thanks
84 Euro 928 5speed
I got a new ring, but I'm having trouble getting it on. I assume I need to press it onto the gear, but it doesn't feel like it wants to go on. Since my old one cracked and it isn't the biggest hunk of metal I'm scared to force it. It isn't the cheapest piece of steel and I don't want to have to buy another one. Has anyone done this? Is there any trick, or is it simple brute force?Thanks
84 Euro 928 5speed
02-14-2018, 11:49 AM
#2
Team Owner
Call Greg Brown at Precision Motorwerks in Anaheim CA.,
He is very good with transmission rebuilding.
He is very good with transmission rebuilding.
02-14-2018, 12:13 PM
#3
Archive Gatekeeper
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Which part number are you asking about?
02-15-2018, 10:48 AM
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Cruisin'
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The Porsche diagrams don't break it out separately. It's shown as part of the gear, but the gear and the engagement ring are actually separate pieces.
Ah, that makes sense Mark. I'm always nervous when freezing stuff as it seems to get condensation on it and I'm paranoid of rust or water getting trapped between the press fit. Am I just being foolish, or should I do anything to avoid that issue? Or just spray it with WD40 or immerse it in oil when I take it out of the freezer before pressing it.
Thanks
Ah, that makes sense Mark. I'm always nervous when freezing stuff as it seems to get condensation on it and I'm paranoid of rust or water getting trapped between the press fit. Am I just being foolish, or should I do anything to avoid that issue? Or just spray it with WD40 or immerse it in oil when I take it out of the freezer before pressing it.
Thanks
02-15-2018, 11:15 AM
#6
Team Owner
spray it with PB blaster
02-15-2018, 12:52 PM
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The engagement ring (or whatever it's called) split on my manual transmission's 4th gear. That made it easy to get the old one off the gear at least. I got a new ring, but I'm having trouble getting it on. I assume I need to press it onto the gear, but it doesn't feel like it wants to go on. Since my old one cracked and it isn't the biggest hunk of metal I'm scared to force it. It isn't the cheapest piece of steel and I don't want to have to buy another one. Has anyone done this? Is there any trick, or is it simple brute force?
Thanks
84 Euro 928 5speed
I got a new ring, but I'm having trouble getting it on. I assume I need to press it onto the gear, but it doesn't feel like it wants to go on. Since my old one cracked and it isn't the biggest hunk of metal I'm scared to force it. It isn't the cheapest piece of steel and I don't want to have to buy another one. Has anyone done this? Is there any trick, or is it simple brute force?Thanks
84 Euro 928 5speed
When an old engagement ring is removed, these teeth on the gear will still be spread at the very tips, making installation of a new ring impossible.
Close inspection of the teeth on the gear makes this problem obvious.
The only way to accomplish this task is to file the raised ridge off of every tooth. The new engagement teeth can then be installed by pressing or with a lead filled plastic hammer.
.......The tough part is figuring out how to retain the new engagement teeth on the old gear, so that it will not move away from the gear, with use. (This always occurs, if the teeth are installed without some sort of active retension.)