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| | | | Joined: Nov 2023 Posts: 2 Moderated | | Moderated Joined: Nov 2023 Posts: 2 | I have a 50 GMC 100 with a 228. I just recently replaced the head gasket and had the head checked out by the machine shop, all tested good. I ran it several times to get the engine up to operating temp and all went well. Total run time was around three hours. The next time I took it out for a spin I noticed a oil/coolant gray colored leaking from what look like the bottom of the fuel pump. Engine was still running fine. Engine did not over heat. I drained the oil pan and there was approx. 3 gallons of coolant in the oil. Any clues on where I should start looking for this leak?
Last edited by Peggy M; 01/16/2024 5:35 PM. Reason: added more info to the title
| | | | | Joined: Oct 2021 Posts: 6,969 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,969 | Unless there's some sort of hole in the block in one of the water galleries, it's coming from the head gasket. Did you have the head and block machined or at least checked with a metal straightedge for square? Perhaps your head or deck is warped.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Feb 2004 Posts: 29,887 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,887 | Try putting air pressure into the cylinders with the crankshaft locked- - - -put the transmission in high gear and chock the wheels front and rear and/or set the parking brake to keep the vehicle from moving after turning the engine so the distributor rotor points toward the spark plug wire of the cylinder you're testing. Make an adapter from a discarded spark plug shell and an air hose quick connect fitting. I use an air pressure regulator to put 20-30 pounds of pressure into each cylinder. When you find the cylinder with the leak you'll see bubbles in the radiator. It's also possible to splice the upper and lower radiator hoses together, bypass the radiator, and pressure check the engine block and cylinder head that way. Don't forget to isolate the heater core to prevent damaging it.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2020 Posts: 79 'Bolter | | 'Bolter Joined: Feb 2020 Posts: 79 | If you haven't already done so. You might want to try re torquing the head bolts.
51 GMC 100 with 59 chevy 261 under the hood.
3 on the floor with 3.42 gear.
| | | | | Joined: Feb 2004 Posts: 29,887 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,887 | Three gallons of coolant in the crankcase is not a seep leak. Find the problem and fix it, ideally with a "mechanic" and/or a "machine shop" who knows what they're doing. Just try to isolate the location of the error before you start tearing it apart again.
What was the symptom that caused the original head gasket replacement to be attempted?
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Nov 2023 Posts: 2 Moderated | | Moderated Joined: Nov 2023 Posts: 2 | I was getting a small amount of coolant in the oil | | |
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