PRE-HEATER HOSE??

[coastiejeep]

I replaced my pre-heater hose on my 90 WAG due to old age/rot. My mechanic did some work on my engine last week and the piece that comes off the valve cover that attaches to the bottom of the pre-heater hose (on the passenger side) broke off. I'm told I have to replace the whole valve cover just to get that piece back. I wouldn't bother except I'm getting a lot of exhaust out of the "hole" now. Can I just use a exhaust repair kit to patch the hole or do I need to get a whole new piece?? Any help is appreciated.

[Crazy_Jeepman]

I am trying to figure out what you are talking about, pre-heater hose? Maybe the air injection hose and Tubes that go to the exaughst manifold? :confused:

Look something like this?? (http://images.andale.com/f2/116/106/4651773/1042603673297_P1140017.JPG)

[89grand]

I'm confused too!

[The Anti-Chrysler]

Take a digital picture and point to it, attach the link...

[Terry B.]

hmmmmmmm...valave cover... pre heater.....exhaust... I'm lost.

[89grand]

???????????????????????????????????????????????I'm not sure what a pre-heater attached to the valve cover does...but I'm glad mine doesn't have one on it! I wouldn't want exhaust coming out my valve cover! The only thing I can possibly imagine that thing is is the metal flex hose that comes off the shroud on the exhaust manifold and connects to the bottom of the aircleaner snorkle. But that certainly isn't connected to the valve cover, and it wouldn't be leaking exhaust if the hose was missing.

[coastiejeep]

Ok, got the truck back and got to look at it. It is the metal flex hose off the exhaust manifold connecting to th aircleaner snorkle. The metal connector on the exhaust manifold broke off, thus the exhaust leak. Should I jerry rig something to connect the hose again, can I seal the hole up, or do I need to replace the exhaust manifold cover in order to get that connecting piece back again. Sorry for the confusion the first time around!

[The Anti-Chrysler]

That tube is only to draw hot air from the surface of the exhaust manifold for warm up - if the mount for it breaks off, it shouldn't much matter. It is only surface mounted and does not actually penetrate the exhaust manifold. Something else must be broken giving you the exhaust leak. The air cleaner does not draw exhaust gasses from the manifold.

You probably have a leak in your air tubes.

[mdill]

Like Jason said, there should be no exhaust leak do to the missing/broken/rusted
carb-heat box. The box is there to funnel air around the outside manifold to warm
it up, it is only a tin box that is riveted to to the outside of the manifold.

Mike D.

[J4GRAND]

On my 73, the heat box isn't even riveted- it just sits on the manifold. Been that way for 8+ years and I've never had any problems with it. If you're in a warm climate, you don't need the "stovepipe" anyway.

[89grand]

You're right I haven't had mine on for over a year now it hasn't made any difference. Of course I live in Arizona so that helps.

[Matthew W. Woodruff]

Is there some kind of valve inside the air riser box?

[89grand]

There is no valve. It's just a shroud that works off convection, heat rises of the exhaust manifold and goes through the top opening in the shroud and up through the hose to the aircleaner. The aircleaner snorkle has doors inside that open and to allow the warm air in then shut to let cool air in after warmup. This is supposed to make it run better when it's cold outside by sending warm air into the carb.

[andy d]

the box on my 88 rotted off yrs ago. i just jammed the hose against the manifold. seems to help the rig warm up better.

[tuckers89GW]

Heck, mine has long ago rotted off. All my Wags have been that way. DOesn't seem to matter much anyway. runs just fine even when -20 degrees.