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 3.0 headgaskets
#1050214
08/22/12 04:19 AM
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Joined: Dec 2000
Posts: 760
OP
Rock Warrior
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I remember way back when, there were lots of threads on here about head gasket issues with the 3.0 V6.
Has anyone done the change? We are in the midst of doing our old 4Runner and I am wondering what should be changed and what is good to re-use.
I recall folks saying that the knock sensor, or at least th wiring harness to it was a good thing to change out as it is hard to get to and disturbing the wiring seems to cause troubles with it.
I am wondering about the head bolts. Are they ok to re-use or should we bite the bullet and get new ones?
Going to do the timing belt as it is time now anyway and I guess the water pump since it is easy to do now.
Is there anything else you would do while it is apart?
Randy
1995 V6 SR5 5 speed 4X4 - 4Runner - dark blue
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Re: 3.0 headgaskets
[Re: oldsub86]
#1050215
08/22/12 02:39 PM
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Joined: Aug 2003
Posts: 2,854
Roll Me Over
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I would change: Headgaskets Head studs (they are NOT re-useable, they are TTY bolts) knock sensor wire valve cover gaskets PCV valve any other leaking seals / gaskets. While you're in there, i would take out the fuel injectors and get them cleaned / flowed. timing belt, idler bearings, water pump, thermostat coolant <img src="/forums/images/graemlins/notooth.gif" alt="" />
89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim
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Re: 3.0 headgaskets
[Re: Greg_Canada]
#1050216
08/23/12 02:12 AM
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Joined: Dec 2000
Posts: 760
OP
Rock Warrior
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So how about the knock sensor itself? It is the expensive part. The harness is $14.
The head bolts and washers are separate. Any reason not to reuse the washers?
Randy
1995 V6 SR5 5 speed 4X4 - 4Runner - dark blue
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Re: 3.0 headgaskets
[Re: oldsub86]
#1050217
08/23/12 06:17 AM
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Joined: Oct 2002
Posts: 15,887
Toyota & Classifieds Moderator
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Knock Sensor - 89615-20010 Your call on replacement.
Use the washers. I'd use new bolts too.
I take it you found the TSB link in the Toyota Archive section for torquing the bolts.
http://www.walkablecommunities.org/Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. **ubi apis- ibi salus**
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Re: 3.0 headgaskets
[Re: kewlynx]
#1050218
08/23/12 03:34 PM
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Joined: Aug 2003
Posts: 2,854
Roll Me Over
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I doubt you'd need to replace the sensors... it's the wire that cracks off when you try to undo it... i did not replace the sensors when i rebuilt my 3.4... just added a new wire...
89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim
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Re: 3.0 headgaskets
[Re: Greg_Canada]
#1050219
08/25/12 06:03 AM
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Joined: Apr 2002
Posts: 3,568
Roll Me Over
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Definitely use new head bolts, and have the heads checked/surfaced at a machine shop.
A new KS is up to you, if you have more time than money I would just swap the KS wire, and see what happens. The dealership recommends replacing the KS do to the the work that would have to be done again to get to the KS if it goes bad.
The FSM will walk you through the process step by step, it isn't a hard job, just time consuming.
More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
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