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#1359797 05/11/2020 5:30 PM
Joined: Nov 2018
Posts: 22
J
'Bolter
'Bolter
J Offline
Joined: Nov 2018
Posts: 22
I had been awhile since I had started the engine, and when I did, it had a loud "thwack" near the top of the engine, passenger side.

Video:



I checked the pushrods, and couple had a slight wobble, but didnt get bent while idling. (checked with pushrod cover off, and holy crap what a mess)

After checking the lash adjustments twice, I decided to let it idle for 30 minutes, and the noise went away
video:


Any ideas what the noise was and why it went away?

Edit: 235 engine, hydraulic lifters, '848 head, '7004 block, Langdon HEI, plugs gapped to .050.

Last edited by Joe W; 05/11/2020 5:31 PM.
Joe W #1359798 05/11/2020 5:42 PM
Joined: Feb 2004
Posts: 29,742
H
Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
H Offline
Joined: Feb 2004
Posts: 29,742
Does the engine have solid or hydraulic lifters? It sounds like a hydraulic cam that somebody has adjusted like a solid lift engine. BTW, it's idling WAY too fast to run it with the valve cover off!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
Joe W #1359803 05/11/2020 6:02 PM
Joined: Nov 2018
Posts: 22
J
'Bolter
'Bolter
J Offline
Joined: Nov 2018
Posts: 22
Its adjusted like a hydraulic lifter, I went 1/2 turn instead of 1.5 turns. Its idling around 700, I'll lower that down to 500.

Joe W #1359818 05/11/2020 7:14 PM
Joined: Feb 2004
Posts: 29,742
H
Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
H Offline
Joined: Feb 2004
Posts: 29,742
It's not uncommon for a hydraulic lifter that sits for awhile with the valve held open to leak down all the way. 235's are notorious for lifters collapsing and taking a long time to pump back up, especially with the replacement lifters that are available now. I'm working on a project to sleeve down the lifter bores a little and run hydraulic lifters for MOPAR/Ford/AMC engines instead of the unreliable Chevy stovebolt hydraulics.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!

Moderated by  Phak1, Woogeroo 

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