Bad Posted May 2, 2008 Report Share Posted May 2, 2008 Anyone a guru in the 3.8L L67? Just removed the UIM and LIM from my daily driver, a 1993 Pontiac Bonneville, and looking for someone to talk to you about if I need to pull the heads off the car--the whole instigator for this project was a radical coolant leak sprouting from just above the block/radiator hose. The dex "Mississippi mud" coolant was squirting out over the sepertine belt. I think this is a head gasket, but everywhere I look people say you cannot blow the head gasket on this engine. Directions to gurus appreciated as well. Thanks. Tony Quote Link to comment Share on other sites More sharing options...
Guest mrhobbz Posted May 2, 2008 Report Share Posted May 2, 2008 You can indeed blow a headgasket on an L67. Quote Link to comment Share on other sites More sharing options...
Bad Posted May 2, 2008 Author Report Share Posted May 2, 2008 You can indeed blow a headgasket on an L67. Of course one can destroy anything. Don't take it literally. Do you have a personal experience to share? Quote Link to comment Share on other sites More sharing options...
Guest mrhobbz Posted May 2, 2008 Report Share Posted May 2, 2008 Of course one can destroy anything. Don't take it literally. Do you have a personal experience to share? Very little, helped my buddy put everything back together on his L67 after he cobbled it all up and lost a bunch of head bolts. Quote Link to comment Share on other sites More sharing options...
Buck531 Posted May 2, 2008 Report Share Posted May 2, 2008 Anyone a guru in the 3.8L L67? Just removed the UIM and LIM from my daily driver, a 1993 Pontiac Bonneville, and looking for someone to talk to you about if I need to pull the heads off the car--the whole instigator for this project was a radical coolant leak sprouting from just above the block/radiator hose. The dex "Mississippi mud" coolant was squirting out over the sepertine belt. I think this is a head gasket, but everywhere I look people say you cannot blow the head gasket on this engine. Directions to gurus appreciated as well. Thanks. Tony So your 93 Bonneville has a L67? Unless you did a swap (that i doubt) then it doesn't have an L67. Do you have a little m62 on it? If so it's a series 1 motor, not a series 2. Also, I didn't think they put Dexcool in pre 96 cars? I don't think they even invented the crap u ntil 96. Anyways.. you already tore it down so you really can't check it. My guess if that you possibly cracked the coolant elbow going from the LIM to the Water pump housing. Quote Link to comment Share on other sites More sharing options...
Guest mrhobbz Posted May 2, 2008 Report Share Posted May 2, 2008 So your 93 Bonneville has a L67? Unless you did a swap (that i doubt) then it doesn't have an L67. Do you have a little m62 on it? If so it's a series 1 motor, not a series 2. Also, I didn't think they put Dexcool in pre 96 cars? I don't think they even invented the crap u ntil 96. Anyways.. you already tore it down so you really can't check it. My guess if that you possibly cracked the coolant elbow going from the LIM to the Water pump housing. You're right on the dexcool bit. Overlooked the part where its a bonneville too Buck is right, its more than likely a series 1. Quote Link to comment Share on other sites More sharing options...
Bad Posted May 2, 2008 Author Report Share Posted May 2, 2008 Sorry, it's a L27 Series one. Confirmed it. L26 was in series one and two, my car is NA, therefore L27. I confirmed it from the VIN and the information on the spare tire cover. The coolant is Dex. The elbow you mention was already replaced a year ago. No leak there. The current leak/squirt was coming from under the coils, straight at the passenger fender well. Ok, it wasn't spraying, but it was launching the coolant out at about 1-3" from under the coils. The coils attach to the head. Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted May 2, 2008 Report Share Posted May 2, 2008 Pressure tests are nice for finding problems. They're definitely easier than tearing into everything. Quote Link to comment Share on other sites More sharing options...
Bad Posted May 2, 2008 Author Report Share Posted May 2, 2008 Should have done that. It was leaking/squirting enough that I THOUGHT it would be obivous. Once I took the gaskets off, It did not seem an obvious gap from LIM to head. http://home.columbus.rr.com/dv8/11.jpg Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted May 3, 2008 Report Share Posted May 3, 2008 check the waterpump and the hose your kind of stuck there if you can't find the leak bite the bullet and throw a new set of head gaskets on it to be sure you cover all the bases Quote Link to comment Share on other sites More sharing options...
Bad Posted May 6, 2008 Author Report Share Posted May 6, 2008 check the waterpump and the hose your kind of stuck there if you can't find the leak bite the bullet and throw a new set of head gaskets on it to be sure you cover all the bases Thanks, Dave. I was guessing that it was NOT the head gasket since I was NOT blowing clouds of smoke and steam out the tail pipe. Going to do the LIM, UIM, and the front head gasket then. Suggestions on best place for gaskets? And shop manuals? Quote Link to comment Share on other sites More sharing options...
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