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Author Topic: 1955 Cadillac Eldorado has engine knock.  (Read 394 times)

Offline Barry M Wheeler #2189

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1955 Cadillac Eldorado has engine knock.
« on: July 22, 2019, 10:44:26 AM »
The widow of a good friend is wanting to get her husband's 1955 Eldorado repaired. It runs, but has a knock that gets worse as the car warms up. She is looking for a mechanic in central IN. My own guy is very good, but I'd like a "possible" cause before I go to him and see about hauling the thing halfway across the state.  (He is quite talented, but has the personality of...Well, he always has a blank scowl on his face, so you don't know what he's thinking.)

Any help would be greatly appreciated.
Barry M. Wheeler #2189


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1991 Cadillac Seville

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Re: 1955 Cadillac Eldorado has engine knock.
« Reply #1 on: July 22, 2019, 10:55:03 AM »
If she's really lucky, it could be carbon knock, saw a fair amount of that back in the day.  GM used to make a solvent for that, poured down the carb, today I believe you would use a Seafoam product.  After that, good likelihood she is looking at an engine overhaul. 
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1973 Cadillac Caribou - Sold - but still in the family
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Offline Barry M Wheeler #2189

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Re: 1955 Cadillac Eldorado has engine knock.
« Reply #2 on: July 22, 2019, 11:13:33 AM »
I wrote her to try that first. Thanks. She also has a 1954 CDV, a 1959 convertible and '81 and '91 Fleetwoods. So she's somewhat familiar with the cars. (All"done" except the 1955.) They sold the '53 Eldo.
« Last Edit: July 22, 2019, 11:25:01 AM by Barry M Wheeler #2189 »
Barry M. Wheeler #2189


1981 Cadillac Seville
1991 Cadillac Seville

Offline bullet bob

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Re: 1955 Cadillac Eldorado has engine knock.
« Reply #3 on: July 22, 2019, 05:54:18 PM »
I had a knock in my '53, turned out to be a vacuum leak.....
Honda Goldwing 1800  "I don't need no stinkin' map, I've still got gas"

 

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