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Discussion Topic:
Valves
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gmcbuffalo |
04-29-2025 @ 12:52 PM
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Member
Posts: 83
Joined: Jul 2011
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I had a water leak that I thought was do to a poor gasket so I took off the head.. I notice that on the number three cylinder valves they are both black. The other three cylinders the intake valve don’t have as much carbon as the number 3 does. Does this look normal or do I need to readjust the intake valve? The engine has only been run for 5 minutes because I didn’t have the coolant lines hook up. I was just trying to see if it would run. Fill it with water and notice a leak in the area behind the water intake for the head. Hence removal of the head.
Greg Meiling
1935 3 Window Coupe
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pauls39coupe |
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04-29-2025 @ 5:25 PM
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Posts: 247
Joined: Jul 2014
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I would be more concerned with the water leak than the carbon on the valves. If the head gasket was not torqued down properly you may have an internal water leak as well as the leak by the water outlet. Leaking water into the engine will steam clean the cylinders, so maybe the others were just steam cleaned.
Check the head and deck with a straight edge to be sure they are level. Try a new head gasket and torque it to specs and in the proper order. Be sure your upper hose is tight at both ends.
Carbon on the valves could be caused by a poorly adjusted carb, bad plugs/plug wires, or just excess idling.
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40 Coupe |
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04-30-2025 @ 5:37 AM
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Senior
Posts: 1803
Joined: Oct 2009
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Passenger side of the engine is 1 front, 2,3,4 rear. Drivers side is 5 front 6,7,8 rear I don't see a big problem with the slight carbon. Is the spark plug fouled with carbon. Use wire core spark plug wires NOT carbon resistor type. Engines burning with moisture in the cylinders will look cleaner than cylinders without moisture. With the head off add a bit of MMO to each cylinder before installing the head. This will help lube the cylinder and the upper compression ring.
This message was edited by 40 Coupe on 5-1-25 @ 4:35 AM
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37RAGTOPMAN |
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05-02-2025 @ 8:19 AM
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Senior
Posts: 1992
Joined: Oct 2009
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how did the engine run,
did it smoke out the tail pipe ?
Did you take a compression test before removing the head,?
I would put a little gas on top of the pistons to see if gas leaks pass the rings,
try a valve adjustment, I do not think is is going to make a difference,
you might have a ignition problem , weak or no spark fouling the spark plugs,
how oil is the spark plug wires and what condition,
let us know more information
hope this helps 37 Ragopman
doing testing before taking apart the engine could have helped in deciding what exactly is the problem
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52flatv8 |
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05-02-2025 @ 10:38 AM
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Posts: 23
Joined: Feb 2025
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Off topic, but I love your 37 !!!
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gmcbuffalo |
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05-04-2025 @ 7:25 PM
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Member
Posts: 83
Joined: Jul 2011
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It didn’t run when I got it had to rebuild it. New head gasket and no leaks. I may not have wire core wires.
Greg Meiling
1935 3 Window Coupe
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carcrazy |
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05-05-2025 @ 12:01 AM
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Senior
Posts: 1989
Joined: Oct 2009
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Greg, When you rebuilt the engine, did you replace any of the studs that retain the cylinder heads to the block? If so, did you seal the threads of the studs that thread into the block? Sometimes coolant will leak past the stud threads that screw into the water jackets. One sealant to use on these threads is Permatex #2 non-hardening sealant.
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gmcbuffalo |
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05-05-2025 @ 10:26 AM
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Member
Posts: 83
Joined: Jul 2011
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Yes I did seal them. Bought the steel gaskets that are a little thicker and that solve the problem.
Greg Meiling
1935 3 Window Coupe
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