overheated 241/ valve cover blown open?

D

darren y

Member
Ok, so I tore into the 241 today, all rockers/ pushrods looked great, apparently overheating caused some internal pressure that blew the valve cover seal, (maybe there was no functional crank case vacuum?) anyway engine cranks over fine, so I pulled the plugs, ugh!, lets just say I don't think #1 plug has been firing for a while...(see close up)
so I bent the valve cover back straight (-ish), rubber gasket was in great shape so I resealed the cover with some right stuff so it'll stay sealed!
Next I'll do a compression check, if all is good then new plugs/wires, oil change, perhaps examine my lack of crank case vacuum issue?

See my previous post for my troubles post ihfsr:

http://forums.IHPartsAmerica.com/IH-sierra-fall-rallye/12504-9th-annual-IHSFR.html
 

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Perhaps the road tube is plugged. Don't think that engine has a pcv valve. Let's see your compression numbers and go from there.
 
That would be how the crankcase was vented on older engines. It might come out of the valve cover or tappet cover and exit where any blow-by gasses and droppings will fall on the road.
 
The "road draft tube". Early scouts had them as well. A nasty way to ventilate the crank case. If you figure out this was your problem, I'd consider plugging it and running a pcv valve configured like on a later sv or four. It's good for the environment and also helps your engine stay free of sludge.
 
Crankcase ventilation is exhausted on the driver's side through the tappet cover behind the ignition coil. It could be either a pcv valve or a draft tube. The draft tube is about an 1" or 1 1/4" with a long radius bend angled down and to the rear. The pcv is in the same location connected to a hose that goes to a pipe that's plumbed to the intake manifold just below the carburetor. Pcv equipped engines also have a hose from the rocker cover to the air cleaner.

Pcv wasn't just for smog regs, many times on early rigs, prior to the epa, they were an option for a cleaner engine. My 1951 l series and the 67 t'all has one.

If it is a pcv, you might be lucky and have the older take-apart one you can clean. A quick check to do on the pcv is run the engine until warm, block the air make-up on the rocker cover going to the air filter; then put a light weight cloth or handkerchief the size of the oil fill hole over the oil fill hole and see if a slight vacuum holds it there at idle.
 
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