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  #1   IP: 67.184.217.215
Old 05-06-2021, 03:47 PM
Sam Sam is offline
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Reversing Gear Retaining pin stuck on Adjusting Collar

I have a well maintained 1966 early model A4 which I have had for 45 yrs here in Chicago. In the past I have never needed to loosen the retaining pin nor needed a collar adjustment. While on the hard this year I want to make a one notch collar adjustment [the collar spaces are slightly larger on the early model than on the late model] and the screw pin is STUCK big time. Thinking the pin is doing it's job but maybe "jammed" into the a collar slot.

I have tried a large screw driver as well as a socket/ratchet wrench but am hesitant to apply leveraged force for fear of shearing the screw head or cracking cast parts and vastly complicating what is a simple job. I have done this on friends late model engines and a screwdriver sufficed. Right now it is sitting with PB Blaster applied. The assembly looks good, no rust or shavings etc. I'll use a torch on the cast yoke next but a little constrained on space. Any suggestions on loosening the retaining pin or a special blend of penetrating oil???
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Old 05-06-2021, 08:33 PM
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Al Schober Al Schober is offline
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No Idea why that screw should be stuck. It's just a split lock washer holding it, and it's not in a corrosive environment.
You are turning it counter clockwise? Lefty loosy...
PB Blaster is a good penetrating agent. There are others but I don't know that they're any better. Use of heat is good - try not to start a fire. Have an extinguisher handy in case you do.
As I recall, there are two lugs for the locking screw. If the other one is in good shape you can get a bit more 'energetic' with the stuck screw. Worst you'll do is break off the lug.
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Sam (05-07-2021)
  #3   IP: 134.134.139.78
Old 05-06-2021, 09:03 PM
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I would take this opportunity to buy a impact screwdriver and be gentle with it's application. No 2lb mini-sledge, please, but a dead blow hammer would work nicely.

https://www.harborfreight.com/6-bit-...ase-64812.html
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Sam (05-07-2021)
  #4   IP: 100.36.65.17
Old 05-07-2021, 09:53 AM
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Quote:
Originally Posted by Sam View Post
...Any suggestions on... a special blend of penetrating oil???
PBBlaster is good.
Kroil is even better.
But best is a 50-50 mix of Automatic Transmission fluid (ATF) and acetone.
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Sam (05-07-2021)
  #5   IP: 67.184.217.215
Old 05-07-2021, 10:54 AM
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Thanks folks. I have an impact hammer but initially hesitant to use it but may have too. It's soaking now w/PB and I'll get back to the boat in a day. Hopefully, w/ a little more time & muscle it will come free.
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  #6   IP: 67.184.217.215
Old 05-07-2021, 01:05 PM
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BTW - ronstory's recommendation on the HF impact driver highlights a usefull tool that every one should have - 9 bucks, great value when you need it.
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Old 05-08-2021, 09:13 PM
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Yes, they are a great, simple device that works amazing well... for no batteries. ;^)

A bit of technique with the impact screwdriver is to find the best tightest fitting bit for the screwhead and then set the driver on it and push it down with your hand only. The screwdriver body (viewed from the 'top') should rotate a little bit clockwise (CW) as it compresses. That means it won't be tighten the screw... which would be bad.

If impact screwdriver rotates counter-clockwise (CCW)... it means the mechanism got flipped and you need to set it back to loosen. DAWIKT.

One you have confirmed the impact screwdriver is set to *loosen*... place it back on the screw and with your 'non kinetic delivery hand' rotate it CCW until you feel the spring fighting you. Then give it solid rap while continue to keep the twisting pressure up. The screw will break free and you won't strip the head.
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