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 Exhaust manifold/ head removal.
#872884
03/02/08 08:43 PM
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Joined: May 2006
Posts: 709
OP
Rock Warrior
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Is there anyway to remove the heads without removing the manifolds? I easily removed the nuts holding the manifold to the head but all the other nuts/bolts holding the manifolds to the rest of the exhaust are frozen solid. I tried prying the manifold away from the heads but couldn't get it far enough away.
Any ideas?
1989 Montero 4dr V6 3.0l
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Re: Exhaust manifold/ head removal.
[Re: 89montero]
#872885
03/02/08 09:18 PM
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Joined: Nov 2003
Posts: 5,690
Trail Leader
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Is there anyway to remove the heads without removing the manifolds? I easily removed the nuts holding the manifold to the head but all the other nuts/bolts holding the manifolds to the rest of the exhaust are frozen solid. I tried prying the manifold away from the heads but couldn't get it far enough away.
Any ideas? Get some PB on those downpipe nuts, they are hard to break free but they will(don't strip them!) I've always had to remove the manifolds with the heads, especially on the 3.5l motor.
1999 Mitsu Montero - Crappy Weather
1992 Isuzu Pickup - Zombie Apocalypse
2008 Saturn Sky Redline - Nice Weather
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Re: Exhaust manifold/ head removal.
[Re: 89montero]
#872886
03/02/08 09:25 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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If you disassemble the Y pipe connection at the converter and at the transmission pan area clamp, the exhaust manifolds should rotate to the side far enough to clear the head studs.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Exhaust manifold/ head removal.
[Re: FrankR]
#872887
03/02/08 11:03 PM
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Joined: May 2006
Posts: 709
OP
Rock Warrior
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If you disassemble the Y pipe connection at the converter and at the transmission pan area clamp, the exhaust manifolds should rotate to the side far enough to clear the head studs.
Frank Those are frozen too.
1989 Montero 4dr V6 3.0l
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Re: Exhaust manifold/ head removal.
[Re: 89montero]
#872888
03/03/08 12:09 AM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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Well, you're gonna have to spray some oil on the bolts and get them off if you want to remove the heads. If the rust is as bad as you say, you'll have to wring some in order to get the job done. Spray some PB Blaster on them, let it sit overnight and try tightening, then loosening. If you break something, just accept it as necessary to get the job done and fix what you break.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Exhaust manifold/ head removal.
[Re: FrankR]
#872889
03/03/08 12:23 AM
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Joined: Mar 2008
Posts: 9
Need a Spot
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Interestingly I just pulled the heads off my 91 without pulling the manifolds. Once the head bolts are loose, you can lift the heads off of the dowel pins and then just slide them towards the center of the engine right off of the manifolds. If you assemble using same method, take extra care not to damage the head gaskets.
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Re: Exhaust manifold/ head removal.
[Re: HondaGuy]
#872890
03/03/08 01:20 AM
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Joined: May 2006
Posts: 709
OP
Rock Warrior
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Interestingly I just pulled the heads off my 91 without pulling the manifolds. Once the head bolts are loose, you can lift the heads off of the dowel pins and then just slide them towards the center of the engine right off of the manifolds. If you assemble using same method, take extra care not to damage the head gaskets. Hope fully that will work for me too. Also what size sockets are the head bolts? I don't have a hex socket that size and can't really bring the engine with me to the hardware store. Thanks for the help.
1989 Montero 4dr V6 3.0l
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Re: Exhaust manifold/ head removal.
[Re: FrankR]
#872891
03/03/08 02:25 AM
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Joined: Dec 2000
Posts: 6,896
Trail Leader
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If you disassemble the Y pipe connection at the converter and at the transmission pan area clamp, the exhaust manifolds should rotate to the side far enough to clear the head studs.
Frank I did this today. I have done it that way on 2 other trucks too. Southern rust free trucks rock.
I just want to tell you both good luck, and we're all counting on you.
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