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454 problem

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Old 01-28-2011, 07:55 PM
  #1
anpacmn
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Default 454 problem

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.

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Old 01-28-2011, 08:13 PM
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Default RE: 454 problem

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
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Old 01-28-2011, 09:43 PM
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Default RE: 454 problem

Quote:
ORIGINAL: 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
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.
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Old 01-29-2011, 11:17 AM
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Default RE: 454 problem

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?
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Old 01-29-2011, 11:32 AM
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Default RE: 454 problem

Cracked Head button? If it's seeping out of the head there are only so many things it can be
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Old 01-30-2011, 07:04 AM
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Default RE: 454 problem

Exhaust manifold gasket.
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Old 01-30-2011, 09:32 AM
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Just curious why does the exhaust manifold gasket cause the the head to leak?
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Old 01-30-2011, 09:54 AM
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Quote:
ORIGINAL: 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?
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?
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Old 01-30-2011, 02:41 PM
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Default RE: 454 problem

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.
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Old 01-30-2011, 02:59 PM
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Quote:
ORIGINAL: Mclovin350z

That guy ^^ explained it well, thank you 1Qwk... Have you ever had the head off? I'm willing to bet it's the exhaust gasket, I've had about 35-40 different engines now, and none have ever had a leaky head.
Sure thing.
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Old 01-30-2011, 05:32 PM
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Hey guys it was the exhaust. I appreciate it and all is working well!
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Old 01-30-2011, 06:32 PM
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Glad to hear you got it sorted out!
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Old 01-30-2011, 06:48 PM
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Good job guys!!
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