7.3 Head Gaskets
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7.3 Head Gaskets
Here is the story, 91 F350 7.3 diesel customer brings me truck says head gaskets are leaking (overheating, compression in the radiator) pull the heads find the #4 pre combustion chamber plug thingy in the head for the glowplug completely gone
and the head gasket burnt out at this point! But I cant find where the compression would be getting in to the cooling system to cause it to over heat.
I realize that that cyl. was dead but there is no indication anywhere of the head gaskets loosing water but I found some rust on the valves of the rear left cyl and some residual water so my question is how can you tell if there is a pinhole in the cyl. never seen one is it plain to see or does it have to be magnafluxed to find them. any help would be appreciated
and the head gasket burnt out at this point! But I cant find where the compression would be getting in to the cooling system to cause it to over heat.I realize that that cyl. was dead but there is no indication anywhere of the head gaskets loosing water but I found some rust on the valves of the rear left cyl and some residual water so my question is how can you tell if there is a pinhole in the cyl. never seen one is it plain to see or does it have to be magnafluxed to find them. any help would be appreciated
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Joined: Oct 2003
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From: Monroe, WA
Where I usually find the hole is at 12 o' clock with the piston all the way down. The only way to find it is to put a test plate on and pump it up, then look for the little pencil stream coming out. After you find it you'll say, "yeah, that looks like a hole". 
The precup was completely gone huh? Havent seen that one yet. Was that on the same hole?
The precup was completely gone huh? Havent seen that one yet. Was that on the same hole?
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Nah it was on a different hole the heads looked like they have been off before and I am sure somebody put the head on with the cup missing
. Well I dont have a way to cap it off and pump it up so I will have to look harder at the heads and gasket hopefully I can find a crack I missed.
. Well I dont have a way to cap it off and pump it up so I will have to look harder at the heads and gasket hopefully I can find a crack I missed.
