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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

What if This on the Crankshaft

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Old May 15, 2026 | 07:56 PM
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What if This on the Crankshaft

What is this thing in my hand? Replaced timing chain and gears and want to replace this thing but don't know what it is. It slides over the crankshaft after you put the timing chain cover on.


 
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Old May 15, 2026 | 08:23 PM
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Don't lose it!

That will provide the seal between the crank and the timing chain cover. It's known as the damper spacer. Use some anti-sieze on the inside.
 
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Old May 15, 2026 | 08:27 PM
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What's wrong with it that you think you need to replace it? It looks fine from my house, and likely far better than any new replacement that may be available, if there even is one.
 
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Old May 16, 2026 | 07:44 AM
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Better design actually IMO
Using the spacer, the 410 and 428 could have the balance weight not be on the damper
Also
That way the damper does not need to be replaced in case of a groove, just the spacer needs to be replaced
 
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Old May 16, 2026 | 07:46 AM
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If the groove is big enough to catch your fingernail the front crank seal wont seal
Take some 320 emory cloth, polish all the grime and rust off of it and check the seal surface with your fingernail
 
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Old May 16, 2026 | 10:34 AM
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Originally Posted by manicmechanic007
If the groove is big enough to catch your fingernail the front crank seal wont seal
Take some 320 emory cloth, polish all the grime and rust off of it and check the seal surface with your fingernail
Already did that and it will grab your fingernail. There's defeinitely a grove where 50 years of dirt particles trapped between it and the seal ground it down. That's why I want to know what it is so I can order a new one. Are they even available? The grove is right where I put the two red lines. It is noticable. Thought about a speedy sleeve but I watched a youtube where a guy put on a speedy sleeve and then couldn't get it to slide through the seal.


 

Last edited by qman; May 16, 2026 at 10:35 AM.
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Old May 16, 2026 | 10:39 AM
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And thank y'all for the name. I found these. Opinions please.

https://ebay.us/m/7i3tKY

https://ebay.us/m/g7K5Zd


This 3rd one actually looks to be cut identically to the original in my engine.

https://ebay.us/m/Zx6lLl
 

Last edited by qman; May 16, 2026 at 10:45 AM.
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Old May 16, 2026 | 07:47 PM
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Someone is making an aluminum replacement that's black and is exactly like the original.
 
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Old May 17, 2026 | 05:50 AM
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DSC has or at least had aluminum ones, Precision oil pumps makes a steel replacement.
 
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Old May 17, 2026 | 06:19 AM
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There are stock Ford ones on Ebay
 
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Old May 17, 2026 | 03:17 PM
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And doesn't this design allow you to perfectly center the front cover? By installing it before you torque down the bolts, it self-aligns the cover.
Hard to do with most 1-piece dampers because there are almost always some bolts behind the damper ring.

Paul
 
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Old Today | 01:52 AM
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Originally Posted by qman
Already did that and it will grab your fingernail. There's defeinitely a grove where 50 years of dirt particles trapped between it and the seal ground it down. That's why I want to know what it is so I can order a new one. Are they even available? The grove is right where I put the two red lines. It is noticable. Thought about a speedy sleeve but I watched a youtube where a guy put on a speedy sleeve and then couldn't get it to slide through the seal.

I had the same problem on an FE several years ago. I sleeved it, and it worked out fine for me.
 
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