1983 F150 6-cyl Exhaust Manifold?

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galt_57@hotmail.com - 27 Aug 2006 23:36 GMT

I have a loud leak there somewhere but I can't even figure out how to
get the pre-heater box off so that I can see. There is some sort of
flap valve thing in the rear of the box. Is it likely that the exhaust
manifold has a hole or crack in it? Thanks.

Dave

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putt@webtv.net - 28 Aug 2006 14:20 GMT

>Is it likely that the exhaust manifold has
> a hole or crack in it?

The shroud is held to the manifold by two nuts.

The manifold nuts/bolts are probably loose. They need to be checked
occasionally for tightness(torqued). This is the most common fault.
Also check the connection at the manifold to exhaust pipe. That donut
gasket deteriorates over time. The studs/nut connection can come loose
also.

Dave S(Texas)

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galt_57@hotmail.com - 28 Aug 2006 18:30 GMT

> galt_57 wrote:
> >Is it likely that the exhaust manifold has
[quoted text clipped - 9 lines]
>
> Dave S(Texas)

Thanks. Do I have to remove both intake and exhaust manifolds at the
same time? I have a big loud hole in there somewhere.

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My Names Nobody - 28 Aug 2006 18:38 GMT

>I have a loud leak there somewhere but I can't even figure out how to
> get the pre-heater box off so that I can see. There is some sort of
> flap valve thing in the rear of the box. Is it likely that the exhaust
> manifold has a hole or crack in it? Thanks.
>
> Dave

Dave,

These one piece 300 straight six manifolds, are the weakest thing about the
300-6.

I have checked literally dozens of them in wrecking yards, never found a
used one that wasn't warped. Bring a straight edge with you and you will
see for yourself.

I have purchased a brand new one from Ford, one of the most expensive
manifolds Ford sells, over $400... The newer fuel injected trucks ('92
anyway) fixed this problem by using two separate manifolds rather than one.

You can change the gasket, bolt it metal to metal without a gasket (mill the
manifold, it will still be warped), but the only long term fix will be a new
manifold. If it were me doing it again at this time, I would look into
putting the newer shorter two piece manifolds on it...

Good Luck

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Whitelightning - 28 Aug 2006 21:39 GMT

>> Dave,
>
[quoted text clipped - 10 lines]
>
> Good Luck

If it were me doing this, I would look at Clifford Performance, which used
to be
Clifford Research and get a set of their spilt headers.

Whitelightning

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