John:
I would suggest some kind of mechanical fastening in addition to the
epoxy. Best would be running a tap into the hole and screwing in a sealed
bolt. A greased tap will keep chips from falling in, followed by a shop vac
to ensure you got them all.
Epoxy on it's own, will work but isn't as permanent.
Chances are, the car backfired first popping the cap off the
manifold (I've actually seen cases where the manifold end caps have been
blown out!). With the plug missing, the car will be running lean which tend
to cause more backfires.
Two possible causes for the original backfire, and subsequent ones.
1. Incorrect valve adjustment. A tight adjuster can cause the valve to
stay open. 2. Burnt exhaust valve. Combustion gases bypassing the valve
hit the incoming charge and ignite it. This is pretty typical, and if your
engine is getting a bit long in the tooth the most likely problem.
good luck
Kelvin.
> Car: 1972 MGB with emissions removed. On the intake
> manifold, there was a
> small take off for something emmissions related that the DPO
> capped with a
> small rubber tube and a screw inserted in the end. Ok, thats
> hokey, but it
> lasted without fault for the 10 years I owned the car. Until
> last night.
> The car started to backfire violently, I popped the hood, and
> noticed that
> this cap was gone. My question is hypothetical though...
> I'm about to go to
> the hardware store to epoxy this hole shut. If this doesn't
> cure the issue,
> I am to assume pressure in the manifold blew that little
> rubber cap right
> off. What would cause this? I just fear my problem isn't
> that this little
> cap, a decade old, decided to give up the ghost randomly. I
> fear that
> something in this engine is gone wrong and created
> backpressure blowing the
> piece off. Your thoughts?
>
> John
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