View Full Version : Is this exhaust gasket correct???
Jim
September 9th, 2019, 09:25 PM
1990 YJ with the 4.2L (with MPFI mods)
Exhaust manifold output / connection to exhaust pipe downtube. Two bolt (stud) connection.
Should there be a gasket in this connection?
Does this gasket look at all correct (it seems way large)?
What say ye?
(no old gasket around but the connection had one broken stud where an old gasket might have fallen out)
FINOCJ
September 9th, 2019, 09:48 PM
Edit....yes a doughnut gasket would normally fit between the manifold and collector flange. Although I think I may have skipped it in mine and just compression fitted the two together. Of course I am emission exempt.
FINOCJ
September 9th, 2019, 10:03 PM
Edited my response....
Java
September 9th, 2019, 10:44 PM
no gasket there, just tighten it down. those are notorious for coming loose and making people think the gasket disappeared. the 4.0 and 2.5 have a donut, but not the 4.2.
Jim
September 10th, 2019, 12:09 AM
I went with Paul's recommendation - no gasket - tightened it up and went for a ride. It was a nice ride. Now I'll confirm some Yes's for some upcoming runs!
Thanks folks.
If anyone says a suitably sized gasket could/should be used - I'm game to hear of it.
dieseldoc
September 10th, 2019, 12:25 PM
Jim ditch the donut.
Pull it nice ant tight no worries!
Front Range 4x4 forums are powered by vBulletin™ Copyright © 2025 vBulletin Solutions, Inc. All rights reserved.