First I would like to make sure that the piece is of this... iteration of the transmission, not some crap left behind by whoever messed with it last. I don't know whether I can check the ring bolts without significant disassembly.
As to trusting it... Drove about 600 miles with zero issues, which is no real indicator if I have a bolt backing out. I know it is more reasonable to do it, but time is scarce.
Darn. I have to do it.
'59 A in the Swiss Alps
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George Krompecher
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George Krompecher
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Re: '59 A in the Swiss Alps
I had some time to flatten the parts. I'd say ring bolt retaining plate?
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Vic Skirmants
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George Krompecher
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Re: '59 A in the Swiss Alps
As usual you're right Vic.
I went magnet fishing this morning, and got a bolt head out.
I wish I could go faster, but with a full time job and other occupations, time is regimented for everything. Still, I am ordering a seal kit for the 644.
I went magnet fishing this morning, and got a bolt head out.
I wish I could go faster, but with a full time job and other occupations, time is regimented for everything. Still, I am ordering a seal kit for the 644.
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Last edited by George Krompecher on Sun Feb 05, 2023 2:53 pm, edited 1 time in total.
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Re: '59 A in the Swiss Alps
Sorry to hear that, but at least no more damage was done. The left side differential cover was probably machined by the bolt head; you might have to replace that. No problem; same part for all tunnel-case transmissions.
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George Krompecher
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Re: '59 A in the Swiss Alps
Yes I feel lucky so far. Now to get the left side plate off. There is also a broken stud there that I will change.
Some real artists were in there last...
Some real artists were in there last...
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George Krompecher
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Re: '59 A in the Swiss Alps
Got the left side cover off. Glad I listened to you all. Of the 6 ring bolts, one is broken and 4 others are loose. There is sign of movement on every one.
The cover has some damage, but doesn't seem too bad.
Now to order some parts.
The cover has some damage, but doesn't seem too bad.
Now to order some parts.
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Re: '59 A in the Swiss Alps
I would replace that cover; it's pretty thin where it was machined by the bolt. There are many out there; should not be expensive.
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George Krompecher
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Re: '59 A in the Swiss Alps
OK, I'll look into it as well.
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George Krompecher
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Re: '59 A in the Swiss Alps
I think I know why it went pear-shaped: the bolts are grade 8.8. Insufficient there? shouldn't they be 12.9?
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Brian R Adams
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Re: '59 A in the Swiss Alps
Or 10.9 ?George Krompecher wrote: ↑Mon Feb 06, 2023 11:15 am I think I know why it went pear-shaped: the bolts are grade 8.8. Insufficient there? shouldn't they be 12.9?
Are they all 8.8?
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Martin Benade
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Re: '59 A in the Swiss Alps
I think 10K or 12k was original, they didn’t use the 8,8 marking back when the car was new.
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George Krompecher
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Re: '59 A in the Swiss Alps
Yes all 6 are 8.8. All but one were loose, and all have damage from movement.
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George Krompecher
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Re: '59 A in the Swiss Alps
Tech questions:
Is it a good idea to safety wire the ring bolts, seeing how one got loose, or are the plates with correct grade bolts enough?
Loctite 270 on the bolts?
Edit: Next question: Gearbox in the car, engine out. Left cover off, right cover on. How do you block the diff from turning when torquing the ring bolts?
Is it a good idea to safety wire the ring bolts, seeing how one got loose, or are the plates with correct grade bolts enough?
Loctite 270 on the bolts?
Edit: Next question: Gearbox in the car, engine out. Left cover off, right cover on. How do you block the diff from turning when torquing the ring bolts?
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Re: '59 A in the Swiss Alps
First, I would suggest removing the differential to check the housing for cracks.
Those plates were not a good idea; soft steel, easy to deform and loosen the bolts. The later bolts have a groove for a retaining plate and no washers under the bolt head. The retaining plate does not "lock" the bolt, but keeps the head in place if it breaks. Loctite; YES. And the correct torque for the later bolts.
Those plates were not a good idea; soft steel, easy to deform and loosen the bolts. The later bolts have a groove for a retaining plate and no washers under the bolt head. The retaining plate does not "lock" the bolt, but keeps the head in place if it breaks. Loctite; YES. And the correct torque for the later bolts.