OK, getting ready to replace the cat on my '91...quick question, on the stock exhaust) is there a 'doughnut' between the rear of the cat where it connects to the rear 'Y' pipe? or is it just a pressure fit?

I could not find any parts listing for a doughnut/gasket in any of my manuals etc.

Right now there is an exhaust leak around that fitting and I'm not sure why as I haven't taken it out yet. Thanks!

It's a pressure fit... get a new donut and life will be grand.

Quote:

So...there is a donut? or not?

IIRC, there is... it's white when new... about 4" round.

I will have to check my books. But I am nearly certain that the rear fit had a donut and the front was a slip fit.

L98 ppl, help me here!

On my 89 there are no gaskets, and I'm almost certain there is none on the later models. What happens at these joints is sometimes there will be a carbon build-up between the "ball" and the concave flange. These need to be very clean, I use sandpaper to get the metal nice and clean. Also check for a slightly bent edge on the "male" end. This will result in a exhaust leak.

Joel


PS: Forgot to mention= tighten the bolts evenly. Too much torque on one side will cock the flange and it will not seal properly

No gasket on my 89. The 84-85(?) had a different rear flange bolt pattern, not sure if they used a gasket. Buy there shouldn't be one on the 91. Joel gave excellent advice above.

Thanks guys I don't know what I would do without you