Wierd vacuum leak issue - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Wierd vacuum leak issue

Print Thread

Wierd vacuum leak issue #1447816 06/05/13 02:40 AM 06/05/13 02:40 AM
Joined: Jan 2003 Posts: 755 Oregon M moparmedic OP super stock
moparmedic OP super stock M Joined: Jan 2003 Posts: 755 Oregon	I have been dealing with a vacuum leak on a fresh 383. Thought the intake wasn't sealing properly and while looking for the leak with a can of carb cleaner found the leak was right around the exhaust crossover. When I spray carb cleaner directly in the opening in the head around the crossover, it will stall the engine. I will pull the head and check it later this week. Do the iron heads develop cracks in the heat riser/crossover area? Seems like that may be whats going on... 1968 Coronet 1968 Charger 1966 A100 Pickup 1967 Barracuda 1970 Challenger 1972 Challenger 1973 Barracuda 2021 Ram 2500

Re: Wierd vacuum leak issue [Re: moparmedic] #1447817 06/05/13 10:33 AM 06/05/13 10:33 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	that is a very high heat(ed) area. That's why that horse shoe cavity needs to be kept uncovered & sometime even that ain't enough. Holler what you find. live every 24 hour block of time like it's your last day on earth

Re: Wierd vacuum leak issue [Re: RapidRobert] #1447818 06/06/13 12:07 AM 06/06/13 12:07 AM
Joined: Feb 2004 Posts: 7,195 Harrisburg, Pa. screamindriver master
screamindriver master Joined: Feb 2004 Posts: 7,195 Harrisburg, Pa.	Another common problem is the cross-over area of the intake warping enough to not seal using just the tin valley pan...Lay a straight edge across the sealing surface of the intake to rule that out...

Re: Wierd vacuum leak issue [Re: screamindriver] #1447819 06/11/13 12:14 AM 06/11/13 12:14 AM
Joined: Jan 2003 Posts: 755 Oregon M moparmedic OP super stock
moparmedic OP super stock M Joined: Jan 2003 Posts: 755 Oregon	Took the head off it is at the machine shop. Didn't find anything obvious. They are going to pressure test it and see if they find anything. 1968 Coronet 1968 Charger 1966 A100 Pickup 1967 Barracuda 1970 Challenger 1972 Challenger 1973 Barracuda 2021 Ram 2500

Re: Wierd vacuum leak issue [Re: moparmedic] #1447820 06/11/13 12:23 AM 06/11/13 12:23 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: while looking for the leak with a can of carb cleaner found the leak was right around the exhaust crossover. When I spray carb cleaner directly in the opening in the head around the crossover, it will stall the engine. What Screamin said, I'd be looking hard at the valley pan metal gasket, how it's sealing & possibly the intake itself (warped) but way less likely. live every 24 hour block of time like it's your last day on earth

Re: Wierd vacuum leak issue [Re: RapidRobert] #1447821 06/14/13 12:55 AM 06/14/13 12:55 AM
Joined: Jan 2003 Posts: 755 Oregon M moparmedic OP super stock
moparmedic OP super stock M Joined: Jan 2003 Posts: 755 Oregon	Quote: Quote: while looking for the leak with a can of carb cleaner found the leak was right around the exhaust crossover. When I spray carb cleaner directly in the opening in the head around the crossover, it will stall the engine. What Screamin said, I'd be looking hard at the valley pan metal gasket, how it's sealing & possibly the intake itself (warped) but way less likely. Yeah, I did all of that. Everything looked good with a straight edge. I also reasealed the intake 3 times and used a different intake on the 3rd time. Also used the Fel Pro side gaskets and a new valley pan. I was down to getting the head checked and then I am out of ideas. Should know more by Monday. 1968 Coronet 1968 Charger 1966 A100 Pickup 1967 Barracuda 1970 Challenger 1972 Challenger 1973 Barracuda 2021 Ram 2500

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1