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Username Post: 400 knock        (Topic#354008)
173rdherd 
"13 Year" Gold Supporting Member
Posts: 401
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
11-21-18 08:30 AM - Post#2752014    

I had what i thought was a knock in my 400 sbc so i pulled it and the oil pan....there doesn't appear to be anything amiss. during the process i found that 1 foot was broken off the torque converter and the center of the flexplate was about 97% busted out in a very jagged pattern that allowed it to continue to start and work. my question is, could that have created the hollow knock sound during startup and low rpm idling in drive?
also, i scraped the old oilpan gasket off (real mess) and even though i was careful, i know i got some crap down in the block.....any good way to clean it out and still button it back up?
thanks....

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 

Ecklers AutoMotive

Rick_L 
Honored Member
Posts: 27510
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
11-21-18 09:53 AM - Post#2752018    
    In response to 173rdherd

Flexplate cracks can cause significant low speed noise. So yes you found it.

Take a paper towel soaked in parts cleaning solvent and wipe up your mess the best you can. Don't turn the crankshaft until you have removed most all the mess. Then I would recommend rotating the crank a small amount to see if you've uncovered any more. What I would then do is assemble the engine and run it a short time, then drain the oil and change the filter.



 
173rdherd 
"13 Year" Gold Supporting Member
Posts: 401
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
11-21-18 05:23 PM - Post#2752057    
    In response to Rick_L

cool...thanks for the response, and that is what i will do. i should have my engine test stand finished soon!!

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 

Ecklers AutoMotive

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