Knock Knock

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D.Yoder
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Knock Knock

Post by D.Yoder » Sat Jul 13, 2019 6:11 pm

;) for three years I have tried to trace down a knock that has bugged me since I built it.
Think I found it.
9BD144CA-3620-4598-9641-A6BA1136EAD4.jpeg


KeithG
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Re: Knock Knock

Post by KeithG » Sat Jul 13, 2019 6:21 pm

Dean, It's great that you finally found it, but are you going to share what you found with the rest of us? :)
Thanks,
Keith
'14 Touring, '26 Roadster Pickup, '27 Fordor, '25 TT C Cab with Express Bed.
Motto: It's hard to build a garage that's tooooo big! :D


Burger in Spokane
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Re: Knock Knock

Post by Burger in Spokane » Sat Jul 13, 2019 6:29 pm

I am guessing it was the use of plywood behind the electrical panel (?).
More people are doing it today than ever before !


Les Schubert
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Re: Knock Knock

Post by Les Schubert » Sat Jul 13, 2019 6:42 pm

Having no information, I’m guessing cam shaft end play!! It can really drive you crazy!!

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D.Yoder
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Re: Knock Knock

Post by D.Yoder » Sat Jul 13, 2019 7:24 pm

After I drive it and am positive what it was I will share .no one has hit it yet :D :D

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Tony_H
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Re: Knock Knock

Post by Tony_H » Sat Jul 13, 2019 7:33 pm

Do you have a "friend" like this???? :lol:
https://www.youtube.com/watch?v=LONT1oboJrs
Government - because people struggle to ruin their lives by themselves


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Re: Knock Knock

Post by Kerry » Sat Jul 13, 2019 8:11 pm

Now I'm sure everything would have been sweet when Dean rebuilt the engine so I'm putting my money on a sneaky little knock on the scat hitting the pan horse shoe or one of the bolts holding it. :D

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D.Yoder
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Re: Knock Knock

Post by D.Yoder » Sat Jul 13, 2019 10:39 pm

Not the scat crank hitting .checked that couple years ago.
B0D6D45F-9305-42ED-84E2-56B11A2383B4.jpeg


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Re: Knock Knock

Post by Adam » Sun Jul 14, 2019 9:37 am

Rod bolt barely tapping the cam? Loose flywheel bolt?

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D.Yoder
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Re: Knock Knock

Post by D.Yoder » Sun Jul 14, 2019 12:05 pm

Not the rods. I have checked them three times ;)

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D.Yoder
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Re: Knock Knock

Post by D.Yoder » Sun Jul 14, 2019 12:12 pm

Flywheel bolts so tight I thought I was going to have a cheater bar to get them off.


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Re: Knock Knock

Post by Joe Bell » Sun Jul 14, 2019 5:31 pm

Had one that drove me nuts, .060 over Egge's with the sharp edge on side was hitting head gasket, Another one was piston hitting top of cylinder on high rpm's with High Compression head.

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Re: Knock Knock

Post by aDave » Tue Jul 16, 2019 10:27 am

Ohhhh - the suspense....


Anxiously awaiting the answer...
suspense.jpg
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ShirkWood
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Re: Knock Knock

Post by ShirkWood » Tue Jul 16, 2019 10:53 am

Bent rod or piston slap?


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Re: Knock Knock

Post by HaroldRJr » Tue Jul 16, 2019 8:58 pm

Crankshaft pulley/pin assembly?

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D.Yoder
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Re: Knock Knock

Post by D.Yoder » Tue Jul 16, 2019 10:34 pm

Removal of one shim cured my knock.
EAA97519-3AFE-431F-9E3D-E9156A86F2A4.jpeg


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Re: Knock Knock

Post by Kerry » Wed Jul 17, 2019 12:26 am

Sounds like you were lucky that your engine didn't eat the magneto :D

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Re: Knock Knock

Post by aDave » Wed Jul 17, 2019 9:45 am

Interesting.

So, for further education, why was the shim installed? For some reason it was put there....the result was not to your liking - (nor to the engine's)...is there a lesson to be learned here that you can share with us?

Incidentally - many thanks for the expertise you have shared in the past!

Dave

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D.Yoder
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Re: Knock Knock

Post by D.Yoder » Wed Jul 17, 2019 1:33 pm

Dave the biggest lesson is 25- 40 clearance loose
25.
The shim I used is a factory shim.
I made it too tight.
Scat cranks have a large radius fillet if I am setting another scat. On the tight end I will check my radius fit with plastigague.

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aDave
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Re: Knock Knock

Post by aDave » Wed Jul 17, 2019 2:57 pm

Thank you.

Another lesson I hope to file away between my ears. (But I will write it down to count for the inevitable "forgetfulness"

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