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Old 08-16-2012, 07:10 PM #1
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How to prevent BHG.
I'm new here and new to 4Runners that are notorious to bhg. I have a '94 SR5 3.slow v6 w/ 191k miles that I purchased for $1300 a week ago. I read a lot of thread in here particularly bhg and have yet to find any preventatives. I only wanted to know what I can do to avoid such disaster.
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Old 08-16-2012, 07:16 PM #2
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Be aware of your cooling system. The 3.0 are very sensitive to heat so keep your cooling system in check make sure your thermostat is working properly etc etc. Also headers are a good investment but that's not a complete solution
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Old 08-16-2012, 07:39 PM #3
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The best helper is to get rid of the exhaust cross over pipe in the back of the engine and throw some headers on and dont let it overheat.

after reading hoe nah's.... Yea, what he said.
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Old 08-16-2012, 07:54 PM #4
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Good water pump and tstat. Toyota coolant. Getting rid of crossover will help
Check to see if it has an open recall
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Old 08-16-2012, 09:23 PM #5
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I will do all of the above except the headers, unless there is one that is CARB approved. Thanks for the help.
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Old 08-16-2012, 10:16 PM #6
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Quote:
Originally Posted by Toysport View Post
I will do all of the above except the headers, unless there is one that is CARB approved. Thanks for the help.
The only problem with doing all except the headers is that the crossover pipe is pretty much the primary culprit--the gaskets typically fail right on the back corner where the crossover pipe cooks them. I'm not sure on the CARB rating, but you can check Rocky-Road for Doug Thorley's, or Northwest Offroad has their own set made to their specs. The other thing with putting headers on the 3.0 is it's the one mod that will wake that thing up a bit, and make other mods work to their fullest (the stock exhaust is pitifully restrictive).
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Old 08-16-2012, 11:06 PM #7
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BucknutBob, Doug Thorley has the CARB approved headers for the 2nd gen 4WD only. Mine is a 2WD. Will it matter?

Also, headers is the only option to fix the culprit? There's no other way? $600 is a little steep.
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Old 08-17-2012, 12:53 AM #8
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$600 for headers is insane.
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Old 08-17-2012, 12:55 AM #9
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Quote:
Originally Posted by 4runnerBrett View Post
$600 for headers is insane.
Its really not that bad, supply and demand... Not many people make them anymore for 20 year old rigs.

If he's going to keep the rig for another 100K plus, then its worth it, but if he's going to get a new car in a year or so, I'd save the cash.
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Old 08-17-2012, 12:45 PM #10
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Quote:
Originally Posted by 4runnerBrett View Post
$600 for headers is insane.

it is but its worth it to help reduce the chances of blow headgaskets which will cost way more than that 600$ plus down time

should look at what people spend on headers for newer trucks and imports
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Old 08-17-2012, 12:50 PM #11
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Quote:
Originally Posted by ToyoTech View Post
it is but its worth it to help reduce the chances of blow headgaskets which will cost way more than that 600$ plus down time

should look at what people spend on headers for newer trucks and imports
Friend of mine put headers on his Z06, 1700 bucks.
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Old 08-17-2012, 01:06 PM #12
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Here is the best way to prevent failure of the head gasket.

step 1. pull heads off
step 2. put in new gaskets
step 3. put heads back on with NEW bolts.
step 4. put a sticky note in the dash to repeat this in 50,000 miles.

youll never get stranded with BHG if you follow this pattern.
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Old 08-17-2012, 02:20 PM #13
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Quote:
Originally Posted by combatmedic View Post
Friend of mine put headers on his Z06, 1700 bucks.
guess 505hp wasnt enough. i driven a 2008 z06 and the hp is crazy fun but shifting sucks!! felt like a billion pounds of pressure was needed to shift near redline.
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Old 08-17-2012, 02:27 PM #14
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Quote:
Originally Posted by ToyoTech View Post
guess 505hp wasnt enough. i driven a 2008 z06 and the hp is crazy fun but shifting sucks!! felt like a billion pounds of pressure was needed to shift near redline.

LOL I got to ride in a ZR1 @ sema last year on a drift track, waited like 3 hours, but totally worth it. CRAZY power.


My friend has an older Z06, 06 I think? It hauls though. He's a speed freak
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Old 08-18-2012, 01:03 PM #15
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I'm actually okay with the $600. The repair cost and downtime if I blow a head gasket will be double that amount.

If the crossover pipe is the culprit, instead of replacing it with headers, how about thermo wrap it to reduce heat around that area? Just a thought.

Installing new head gasket every 50k miles is equivalent to 7-10 years for me since I average 5k miles yearly. However, additional horsepower and maybe mpg maybe possible if I install headers.

Question I have for those who have headers, how many miles has it been since the install and how's the head gasket?
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