TLoft 0 Posted March 24, 2019 Share Posted March 24, 2019 I'm trying to identify a strange noise coming from the straight 8 of my '51 Chieftain. It's not a constant, steady sound like a bad rod but higher pitched and comes and goes. I've disconnected the fan belt but the noise is still there so it's not water pump or generator. Is it possible that the timing chain has stretched and is scraping something or a bushing in the distributor is going bad? It's from the engine and not back in the clutch like a throwout bearing. It's a new one to me and don't know where to start looking. Thanks. Link to post Share on other sites
pontiac1953 286 Posted March 24, 2019 Share Posted March 24, 2019 Get or borrow a stethoscope to pinpoint the noise. Link to post Share on other sites
32Pontiac6 32 Posted March 25, 2019 Share Posted March 25, 2019 Stethoscope is a marvelous tool to narrow down the noise. I have used an inexpensive Harbor Freight one many times on my split head Pontiacs. 1 Link to post Share on other sites
john hess 150 Posted March 25, 2019 Share Posted March 25, 2019 If all else fails...... Turn radio up louder !! Works every time...... 1 Link to post Share on other sites
john hess 150 Posted March 25, 2019 Share Posted March 25, 2019 Seriously though... My 53 l8 has a on again- off again noise also. I think one of the lifters or cam has a flat spot. A slight increase in idle speed will stop it... If your valve covers are off... Watch the valves to make sure all are rotating... This is how I made my diagnosis... John Link to post Share on other sites
john hess 150 Posted March 25, 2019 Share Posted March 25, 2019 Then refer to my earlier post..... John Link to post Share on other sites
john hess 150 Posted April 17, 2019 Share Posted April 17, 2019 Did you ever find out what your noise is? Link to post Share on other sites
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