anpacmn

Hey guys I have a quick question that I am having with my 454 motor. I am just starting out in the hobby and hope some body can point me in some kind of direction, So here is the problem that I am have; When try and start my engine I can see that there is a lot of fuel that is shooting out between the top of the piston sleeve and the head of the motor, Any ideas what may be causing this? Possible bad gasket? Any help would be appreicated.

SMOKEFAN

Is the head loose or glowplug loose? Theres not really a head gasket its more like a shim to adjust compression that seal to the top of the piston sleeve

1QwkSport2.5r

If there is oil or fuel coming from between the head and the sleeve, the head is loose most likely. The machining is often good enough to get a good seal without a head shim in it. If it were me, I'd pull the head off, clean the screws and screw holes with carb cleaner or some kind of solvent that'll break oil down. clean it up good, blue locktite the head screws and torque in an X pattern.

If you dont use blue locktite, you run a high risk of the screws coming loose again.

p.s. Anpacmn - I see you're from Cloquet, MN. I'm down in Cottage Grove. Good to see another Minnesotan R/C'er here.

anpacmn

The glow plug is not loose either is the head.   I seems to me that it is more oil that is coming out of the motor........any other ideas why this may be occurring?

SMOKEFAN

Cracked Head button? If it's seeping out of the head there are only so many things it can be

Mclovin350z

Exhaust manifold gasket.

anpacmn

Just curious why does the exhaust manifold gasket cause the the head to leak?

1QwkSport2.5r

Just because they're tight doesnt necessarily mean its making a good seal. A few things to keep a note of. First, if the glow plug has been removed and reinstalled oftentimes (in my experience) you have to snug the plug back in a little tighter than previously because the copper gasket may not seat in the exact same place and might leak a little bit. Usually you'll see bubbles around the glow plug while the engine is running. Second; If the head isnt torqued down evenly ("X" pattern", sometimes you can get a leak between the block and the
head button. This doesnt happen very often if there is a clean undamaged head shim in place. Third; Like Mclovin350z said, if the exhaust gasket has a rip or chunk missing it can leak a little bit blowing oil around the base of the cylinder head/button giving the illusion the head itself is leaking. When I install a header onto a new gasket, I use a light film of ARO or another light oil on the rubber seal and twist the header onto the new seal. This prevents the seal from getting damaged. I've seen torn header seals right out of the box so this is certainly a possibility.

Could you take a picture of the offending engine and post it?

Mclovin350z

That guy ^^explained it well, thank you 1Qwk... Have you ever had the head off? I'm willing to betit's the exhaust gasket, I've had about 35-40 different engines now, and none have ever had a leaky head.

1QwkSport2.5r

Sure thing.

anpacmn

Hey guys it was the exhaust. I appreciate it and all is working well!

Mclovin350z

Glad to hear you got it sorted out!

SMOKEFAN

Good job guys!!