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PostPosted: Fri May 31, 2019 11:53 pm 
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3 Deuce Webber

Joined: Wed Mar 28, 2018 10:52 pm
Posts: 76
Car Model*: 1975 Plymouth Duster
Finally got the cursed slant six running, but now that its idle is somewhat below 2k RPM I can hear an awful metallic clatter at idle. Oil pressure is good, gets 25-32PSI at idle. There were a couple of startups where it immediately jumped up to 2k rpm, would this have bent a pushrod? Planning on taking the valve cover off when I get the chance but seeing as how it makes good pressure I can't imagine it's rodknock.


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PostPosted: Sat Jun 01, 2019 11:06 pm 
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3 Deuce Webber

Joined: Wed Mar 28, 2018 10:52 pm
Posts: 76
Car Model*: 1975 Plymouth Duster
Got the valve cover off, nothing seems to be out of place, once again worried that it might be a lower end issue.


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PostPosted: Sun Jun 02, 2019 3:47 am 
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Turbo Slant 6

Joined: Thu Jun 07, 2012 4:29 pm
Posts: 592
Location: Houston
Car Model*: 68 Valiant
It could be a million things. Given the engine has been cursed, 2 million.

Bottom end issues seldom 'clatter'....if they do, they don't do it for long.

It could be a loose torque converter bolt hitting the stamped steel cover. Or a loose 'whatever'. You haven't given nearly enough detail to make any further suggestions.


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PostPosted: Sun Jun 02, 2019 5:41 pm 
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3 Deuce Webber
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Joined: Sun Jun 29, 2014 8:01 am
Posts: 57
Location: United States
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If you have a harbor freight nearby they have mechanics stethoscopes for $4

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PostPosted: Sun Jun 02, 2019 7:53 pm 
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Joined: Wed Nov 06, 2002 1:57 pm
Posts: 1991
Location: Everett, WA
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Any 3 foot long "stick" can be used. Place one end of the "stick" against, the engine and the other against your ear. Move "stick" around until you find the clatter. Once you find the clatter, you can make an intelligent guess on the cause. Otherwise you are just guessing.


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PostPosted: Sun Jun 02, 2019 8:02 pm 
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Turbo Slant 6

Joined: Thu Jun 07, 2012 4:29 pm
Posts: 592
Location: Houston
Car Model*: 68 Valiant
With all the computer-driven capabilities of today, it's surprising no one is selling a tool/sensor that you stick on an engine that can analyze noises.


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PostPosted: Sun Jun 02, 2019 8:50 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 12621
Location: Park Forest, Illinoisy
Car Model*: 68 Valiant
Did you actually check valve lash? Rocker shaft bolt torque? It wouldn't take much for a rattle.

Also, converter bolts. They don't have to back out far to hit the cover.

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PostPosted: Mon Jun 03, 2019 1:42 pm 
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3 Deuce Webber

Joined: Wed Mar 28, 2018 10:52 pm
Posts: 76
Car Model*: 1975 Plymouth Duster
slantzilla wrote:
Did you actually check valve lash? Rocker shaft bolt torque? It wouldn't take much for a rattle.

Also, converter bolts. They don't have to back out far to hit the cover.


I'll check the converter bolts. I'm the one who torqued them so there's a 99% chance I did it wrong and one's loose. Valve lash and rocker shaft bolts are fine. It's more of a knock than a clatter, and only at idle. Can't run it today as I'm letting some RTV dry.


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PostPosted: Tue Jun 04, 2019 8:01 pm 
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3 Deuce Webber

Joined: Wed Mar 28, 2018 10:52 pm
Posts: 76
Car Model*: 1975 Plymouth Duster
Alright, after running it today and listening with a stethoscope, it sounds like just about damn near everything is making way more noise than it should. Of course, it's got a FRAM filter on it, so when I get the chance I'll do an oil and filter change and see if that helps. I'm concerned the filter has done what all fFRAM products normally do and collapsed in on itself.


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