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'58 Plymouth Torqueflite Knock
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Myke
Posted 2021-01-01 9:05 PM (#607321)
Subject: '58 Plymouth Torqueflite Knock



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Hey all, recently finished the rebuild of my 318 poly, got everything reassembled and put back together, Fired it up and am experiencing a loud knock that follows the rpms of the crank . At first I thought it was a rod knock but its much louder than any rod knock ive ever heard. I used the mechanic stethoscope and the noise is louder touching the bell housing than the block. Im wondering if anyone would know what this might be? Is it possible from a loose torque converter bolt? Or is possible that it's more internal than that? Any suggestions? Thanks!
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58coupe
Posted 2021-01-01 9:55 PM (#607322 - in reply to #607321)
Subject: Re: '58 Plymouth Torqueflite Knock



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Even if you left the nuts on the torque converter to crankshaft loose I doubt it would cause a knock that loud. It could be a loose bolt holding the adapter to the block and sticking out so the converter hits it.
Completely unrelated but a number of years ago my son bought a chev Z-28 that was sold as is with an engine knock. when we started it to load on the trailer it was knocking so loud it sounded like the crank was about to fall out the bottom. When we pulled it apart the engine was fine but the flex plate and torque converter were both very loose.
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Myke
Posted 2021-01-01 11:06 PM (#607325 - in reply to #607322)
Subject: Re: '58 Plymouth Torqueflite Knock



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What adapter are you referring to here? The starter plate?
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58coupe
Posted 2021-01-02 12:35 PM (#607332 - in reply to #607321)
Subject: Re: '58 Plymouth Torqueflite Knock



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I was referring to the starter plate. Is every part original 58, engine, crank, starter, adapter plate?
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Myke
Posted 2021-01-02 2:29 PM (#607334 - in reply to #607332)
Subject: Re: '58 Plymouth Torqueflite Knock



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The Block Isn't original, however the crank, starter, plate, T-convert. are the same that were running fine when it came out
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wizard
Posted 2021-01-02 5:25 PM (#607340 - in reply to #607321)
Subject: Re: '58 Plymouth Torqueflite Knock



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What comes to my mind is that perhaps the engine and the bell housing isn't aligned correctly, especially if the trans/engine wasnt "married" from the beginning. That could make the pump lobes pressing hard agains each other.

That said, I was chasing a similar sound on a Pontiac Catalina and I was convinced that the sound came from the converter area. The problem in this case was actually a worn fuel pump that transmitted "clonks" through the cam chain, crank and "ended" up in the bell housing.......
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Myke
Posted 2021-01-02 5:50 PM (#607341 - in reply to #607340)
Subject: Re: '58 Plymouth Torqueflite Knock



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wizard - 2021-01-02 2:25 PM

What comes to my mind is that perhaps the engine and the bell housing isn't aligned correctly, especially if the trans/engine wasnt "married" from the beginning. That could make the pump lobes pressing hard agains each other.


You know, now that you say that, I did have a problem with aligning the trans and getting the bottom of the bell to mate properly
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58coupe
Posted 2021-01-03 12:44 PM (#607367 - in reply to #607321)
Subject: Re: '58 Plymouth Torqueflite Knock



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You may already know this but the alignment pin locations on the block changed from 61 to 62 also the bolt pattern may be a little different.
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