1987 turbo, Need help diagnosing!!! - Page 2

dylansword · 01-30-2010, 03:06 AM

ok, so i did the leak down test. The back 2 cylinders, seemed to drop to drop slow, these r the two with oil in them. ( also the car has meen jacked up in the front for a day now, so oil would hav run back ). all the others either didnt drop, or dropped very very slowly. And i was using a comp guage. And it dosent seal very well at the o rings. I can hear it hiss from the sometimes.

dylansword · 01-30-2010, 04:08 AM

it leaked slowly in the rear two cylinders.

cre · 01-30-2010, 06:45 PM

Depending on how much oil is in there it's probably not leaking out past the rings either.. leaving you with a crack, bad HG, or bad valves. My vote is still HG or crack.

Is the coolant contaminated? Do a pH test and see if it's caustic.

IMHO, any way about it, the head is coming off.

dylansword · 01-31-2010, 07:19 AM

Ok, so i just got the head off. And it is indeed a bhg. My question now is, what would hav caused the head gasket to blow if it was replaced only 6 months ago? it blew on cyl 1,3,5 between the cylinder and the water journals. Should i just put the new gasket in, or should i get the head shaved? thanks

supradaddy0803 · 02-02-2010, 10:09 PM

How much work did you do to the mating surfaces before you put it back together? I would have measured for warpage on the head and the block with a gauge. Also if the head wasnt torqued properly in stages like it should be then there is another issue. Also did whoever did it use the old head bolts? You know those have to be replaced. If it were me (and with a 1JZ I dont run into the BHG problem like you do) I would take the whole engine out take it to a machine shop and have it tested for cracks first thing. Cre was trying to tell you what you already found. Have the surfaces checked for warps then if everything checks good install ARP studs and a new HG. From every 7M owner I know they Smack you if you didnt invest in them.

cre · 02-03-2010, 06:37 AM

Quote:

Originally Posted by supradaddy0803

Also did whoever did it use the old head bolts? You know those have to be replaced.

No, actually they don't. They need to be inspected, but they are not torque to yield bolts and may be reused.

01-30-2010, 06:45 PM	#13
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Depending on how much oil is in there it's probably not leaking out past the rings either.. leaving you with a crack, bad HG, or bad valves. My vote is still HG or crack. Is the coolant contaminated? Do a pH test and see if it's caustic. IMHO, any way about it, the head is coming off. __________________ 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 --->

02-02-2010, 10:09 PM	#15
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	How much work did you do to the mating surfaces before you put it back together? I would have measured for warpage on the head and the block with a gauge. Also if the head wasnt torqued properly in stages like it should be then there is another issue. Also did whoever did it use the old head bolts? You know those have to be replaced. If it were me (and with a 1JZ I dont run into the BHG problem like you do) I would take the whole engine out take it to a machine shop and have it tested for cracks first thing. Cre was trying to tell you what you already found. Have the surfaces checked for warps then if everything checks good install ARP studs and a new HG. From every 7M owner I know they Smack you if you didnt invest in them. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

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01-30-2010, 03:06 AM	#11
dylansword 3" Exhaust Join Date: Jan 2010 Location: boise id Posts: 50	ok, so i did the leak down test. The back 2 cylinders, seemed to drop to drop slow, these r the two with oil in them. ( also the car has meen jacked up in the front for a day now, so oil would hav run back ). all the others either didnt drop, or dropped very very slowly. And i was using a comp guage. And it dosent seal very well at the o rings. I can hear it hiss from the sometimes.

01-30-2010, 04:08 AM	#12
dylansword 3" Exhaust Join Date: Jan 2010 Location: boise id Posts: 50	it leaked slowly in the rear two cylinders.

01-31-2010, 07:19 AM	#14
dylansword 3" Exhaust Join Date: Jan 2010 Location: boise id Posts: 50	Ok, so i just got the head off. And it is indeed a bhg. My question now is, what would hav caused the head gasket to blow if it was replaced only 6 months ago? it blew on cyl 1,3,5 between the cylinder and the water journals. Should i just put the new gasket in, or should i get the head shaved? thanks