BHG AGAIN within 2 months.

spunkenhimer · 06-16-2011, 01:07 AM

I just did a BHG REPLACEMENT that took me awhile and finally got the car back on the road and running pretty nice i thought.
anywho about 3 weeks ago i was coming back up from Jacksonville NC (where my girl stays) and started getting white smoke out the back again. "To be sure i don't have another BHG right after i just replaced it." i thought. Well my dad told me that a Bad catalytic converter can cause the car to smoke really bad and even be the root cause of the first BHG well we took it off today and found it was horribly clogged up. I then crancked the car again in hopes that it was just the catalytic converter that was causing the white smoke and all but yet again it started smoking only just a few minutes after starting her up. I got another BHG within 2 months after just replacing the first one. Thing is i'm wanting to prevent anymore issue if possible for awhile cause i'm going to eventually do a 1uzfe swap. But i would like to have the car running in the mean time.
any suggestions on what i should make sure of this go around?

Sonyps307 · 06-16-2011, 03:34 AM

Did u torque to 78lbs or more? Did u have the head shaved? Get some Arp head studs they have more clapping force.

ksd9000 · 06-18-2011, 05:30 AM

Your dad has it backwards...

BHG causes the coolant to dump into the catalytic converter that causes it to fail, get clogged up etc.

Tighten the head to 80 ft lbs. If you are palanning to run the engine for a relatively short time, dont waste you cash on expensive studs/MHG etc.

MJG · 06-19-2011, 02:27 AM

re torque of the heab bolts / studs, after replacing the head gasket is, in my opinion, always a good pracice.
72 LB FT maximum for stock head bolts.
75 LB FT for ARP bolts.
80 LB FT for ARP studs.

spunkenhimer · 06-20-2011, 03:56 AM

thanks guys i'll post pics of the tear down and rebuild again. hopefully this time it will be quicker.

cre · 06-20-2011, 04:35 AM

Torque specs:
http://www.toyota-supra.info/forums/84660-post8.html

Make sure you chase the threads in the block and lubricate the fasteners thoroughly with a GOOD moly lubricant.

Were both the head and the block inspected for cracks, pitting, warpage?

Generally if a HG is already leaking I don't recommend re-torquing as an attempted fix... You're liable to trap moisture and open yourself up to cavitation of head or block (and with an old HG possibly compromise the reinforcement rings around the coolant jackets and cylinder bores). If the block's really expendable then feel free.. if it works, then you've lost nothing as it's only going to be in there for a year or so and if not well, you're still pulling it.

06-16-2011, 01:07 AM	#1
spunkenhimer Intake Join Date: Feb 2008 Location: Pikeville NC. Posts: 49	BHG AGAIN within 2 months. I just did a BHG REPLACEMENT that took me awhile and finally got the car back on the road and running pretty nice i thought. anywho about 3 weeks ago i was coming back up from Jacksonville NC (where my girl stays) and started getting white smoke out the back again. "To be sure i don't have another BHG right after i just replaced it." i thought. Well my dad told me that a Bad catalytic converter can cause the car to smoke really bad and even be the root cause of the first BHG well we took it off today and found it was horribly clogged up. I then crancked the car again in hopes that it was just the catalytic converter that was causing the white smoke and all but yet again it started smoking only just a few minutes after starting her up. I got another BHG within 2 months after just replacing the first one. Thing is i'm wanting to prevent anymore issue if possible for awhile cause i'm going to eventually do a 1uzfe swap. But i would like to have the car running in the mean time. any suggestions on what i should make sure of this go around?

06-20-2011, 04:35 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Torque specs: http://www.toyota-supra.info/forums/84660-post8.html Make sure you chase the threads in the block and lubricate the fasteners thoroughly with a GOOD moly lubricant. Were both the head and the block inspected for cracks, pitting, warpage? Generally if a HG is already leaking I don't recommend re-torquing as an attempted fix... You're liable to trap moisture and open yourself up to cavitation of head or block (and with an old HG possibly compromise the reinforcement rings around the coolant jackets and cylinder bores). If the block's really expendable then feel free.. if it works, then you've lost nothing as it's only going to be in there for a year or so and if not well, you're still pulling it. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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06-16-2011, 03:34 AM	#2
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	Did u torque to 78lbs or more? Did u have the head shaved? Get some Arp head studs they have more clapping force.

06-18-2011, 05:30 AM	#3
ksd9000 Stock Join Date: Apr 2011 Location: Texas Posts: 10	Your dad has it backwards... BHG causes the coolant to dump into the catalytic converter that causes it to fail, get clogged up etc. Tighten the head to 80 ft lbs. If you are palanning to run the engine for a relatively short time, dont waste you cash on expensive studs/MHG etc.

06-19-2011, 02:27 AM	#4
MJG 3" Exhaust Join Date: Mar 2010 Location: Washington State Posts: 125	re torque of the heab bolts / studs, after replacing the head gasket is, in my opinion, always a good pracice. 72 LB FT maximum for stock head bolts. 75 LB FT for ARP bolts. 80 LB FT for ARP studs.

06-20-2011, 03:56 AM	#5
spunkenhimer Intake Join Date: Feb 2008 Location: Pikeville NC. Posts: 49	thanks guys i'll post pics of the tear down and rebuild again. hopefully this time it will be quicker.