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Old 02-09-2021, 05:15 PM   #21
Synchro909
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Default Re: Fatigue Cracks In Model "A" Parts

Who hasn't seen a cracked front cross member?
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Old 02-10-2021, 12:00 PM   #22
kawagumby
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Default Re: Fatigue Cracks In Model "A" Parts

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Originally Posted by alexiskai View Post

My '31 has a couple of small cracks in the flywheel housing. Looking at them, I did not think they would ever become a problem, however I did order an un-cracked replacement housing should I ever pull the engine again. I wonder if such small cracks have ever resulted in any kind of actual running failure?
I also had the radiator fill tube separation as noted earlier...an easy solder fix. 90+ years and still going...better than me, LOL...
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Old 02-10-2021, 12:25 PM   #23
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Default Re: Fatigue Cracks In Model "A" Parts

Where the radiator intake connects to the top tank is a frequent fatigue failure. The upper hose is very stiff and as the engine moves, especially with float-a-motors, it put high stress into that joint. We have had several of these in our club.
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Old 02-10-2021, 12:43 PM   #24
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Default Re: Fatigue Cracks In Model "A" Parts

Funny you should ask. This just happened this week. I have never seen a water-pump casting that broke because of a too tight fan belt before tjis one.
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Old 02-10-2021, 01:37 PM   #25
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Default Re: Fatigue Cracks In Model "A" Parts

Steering column to gas tank bracket.
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Old 02-10-2021, 01:57 PM   #26
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Default Re: Fatigue Cracks In Model "A" Parts

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The front crossmember is another high stress point and many are found with cracks.
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Old 02-11-2021, 08:30 AM   #27
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Default Re: Fatigue Cracks In Model "A" Parts

Thanks all for your replies.
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Old 02-11-2021, 09:23 AM   #28
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Default Re: Fatigue Cracks In Model "A" Parts

Pictures of fatigue cracks accumulated so far:
Attached Images
File Type: jpg Bolt Crack 11kb.jpg (11.5 KB, 4 views)
File Type: jpg Cfrsnkshaft Journal Crack 21kb.jpg (20.9 KB, 7 views)
File Type: jpg Clutch Arm Crack 39kb.jpg (38.6 KB, 4 views)
File Type: jpg Coil Spring Crack 10kb.jpg (9.8 KB, 4 views)
File Type: jpg Fan Blade Failure 90kb.jpg (89.9 KB, 4 views)
File Type: jpg Front Crossmember Cracks 11kb.jpg (11.1 KB, 10 views)
File Type: jpg Gear Tooth 11kb.jpg (14.7 KB, 6 views)
File Type: jpg Rear Axle Fatigue Failure 221kb.jpg (33.3 KB, 4 views)
File Type: jpg Spring Hangar Crack 26kb.jpg (25.7 KB, 4 views)
File Type: jpg Transmission Gear Teeth 19 kb.jpg (18.8 KB, 6 views)
File Type: jpg Upper Radiator Neck Crack 42kb.jpg (42.3 KB, 9 views)
File Type: jpg Wheel Hub Crack 33kb.jpg (32.7 KB, 11 views)
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Old 02-11-2021, 03:16 PM   #29
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Default Re: Fatigue Cracks In Model "A" Parts

Quote:
Originally Posted by Synchro909 View Post
Who hasn't seen a cracked front cross member?
Thanks for posting that. I was going to.
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Old 02-11-2021, 03:56 PM   #30
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Default Re: Fatigue Cracks In Model "A" Parts

This is a pretty short list of parts considering the age and technology available for the time.
I like the broken gear, I have one from a Honda motorcycle where the tooth is broken on both sides and wiggles like a 3 year old's loose tooth. It came out of a running motor/trans in a kart, still together.
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