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Joined: Jun 2015
Posts: 269
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Jun 2015
Posts: 269 |
My 31 194 engine runs very well but when it is under strain or I am trying to accelerate I get a chatter that ends as soon as I can let up on the gas. Is that normal for this engine.
31 Chevy Roadster
64 Corvette
76 Corvette
77 Grand Prix
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Not normal.
Possible loose rod or main bearings or pistons.
Gene Schneider
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Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jun 2015
Posts: 269
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Jun 2015
Posts: 269 |
It sounds like I need to do more digging. Thanks Guys.
31 Chevy Roadster
64 Corvette
76 Corvette
77 Grand Prix
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Joined: Oct 2007
Posts: 558
Oil Can Mechanic
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Oil Can Mechanic
Joined: Oct 2007
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Joined: Nov 2002
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ChatMaster - 7,000
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ChatMaster - 7,000
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Try pulling the spark control knob to retard the timing. It may just be the timing is advanced too far and you are getting pinging. An easy check before digging in deep.
Steve D
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Joined: Jun 2015
Posts: 269
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Jun 2015
Posts: 269 |
I tried retarding a bit and it did help some. As near as I can tell the motor was rebuilt about 40,000 miles ago, if the records I have are complete. I think I will work on the side of being safe and at minimum drop the pan and do some checking. I appreciate everyone's input. This forum is priceless.
31 Chevy Roadster
64 Corvette
76 Corvette
77 Grand Prix
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Retarding the timing wil REDUCE loose bearing noise AND PISTON SLAP.
Gene Schneider
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