smoke after rebuild of top end

supraspaz · 02-10-2009, 02:24 AM

ok new to the world of supra (more experienced in chevy n triumph ) so usual suspects of bhg

. she is a 87 7m-ge 5-speed - well tear down n rebuild of top end in three days. ( when i get on a project i keep on it , sometimes bad ) just hopeing this is not one of the times it's bad. anywho cleaned everything really really really good (parts washer hehehe ) replaced all gaskets except cam seals n egr box ( cover with 8 bolts ) stock gasket kit was used ... but after start up all was well ... on test drive the familar smoke was back

but not as bad ... is this a possibality of a warpped head ? ( no it was not sent to a shop to be re-worked ) is their anything else that would cause smoke in the exhaust like that ?
sorry for odd n maybe simple questions ... just n unknown territory

thanks

SilverBullet05 · 02-10-2009, 03:50 AM

i would have t osay you probablly should have taken the head to a shop to get lapped and atleast taken a hone stone to the block if it isnt able to go to a shop. it could be warped head possiblly the block, but it kinda sounds like the rings are a litl worn out. a little more info on the motor would be nice. Like miles on it before the rebuild would help. just my piece of mind. good luck.

supraspaz · 02-10-2009, 10:53 PM

well tonight when i'm workin on it i'll get the info n if i can i will post the pic's of the 1st rebuild. lol hopefully you can get n idea of what it looks like. wish me luck ... when i rip it apart again

oh im gonna send the head out this time to have it re-worked.

tsupranami · 02-12-2009, 08:20 AM

Does it puff a big cloud on startup? Trailing throttle? If so, old, hard valve stem seals and worn rings are most likely culprits. Mine was mainly valve stem seals. I had over 200k miles, and cylinders looked like new, rings were worn but not past spec, still had over 160psi compression. But it would paint a nice film of oil on the rear bumper after a few hundred miles. Yuk. I had my head surfaced and new stem seals installed for $200, including reassembly. I didn't let them touch the valves or seats, as they were sealing just fine. They just removed them , then cleaned and replaced them. Then I installed a MHG w/ ARP studs and turned up the boost. Smoke has been gone ever since and no more oily bumper.

supraspaz · 02-14-2009, 08:31 PM

well after using mass amounts of solvent. in the intake too i might add. i drove the car for about 15 minutes n then wow all was gone except a light blue (probablly the valve stem seals) puff on hard excel. runs smooth n no other signs of other issues (yet). will probablly do a mhg after i save n have some other small projects tackled on her. hopefully i can get some advice on the rebuild with mhg from everyone if possible. also if still waiting on the photos ... just a little longer ... i can't find my memory card. lol thanks again!

oh any good places to get parts or web sites? just curious

02-10-2009, 02:24 AM	#1
supraspaz Stock Join Date: Feb 2009 Location: Bethlehem PA Posts: 5	smoke after rebuild of top end ok new to the world of supra (more experienced in chevy n triumph ) so usual suspects of bhg. she is a 87 7m-ge 5-speed - well tear down n rebuild of top end in three days. ( when i get on a project i keep on it , sometimes bad ) just hopeing this is not one of the times it's bad. anywho cleaned everything really really really good (parts washer hehehe ) replaced all gaskets except cam seals n egr box ( cover with 8 bolts ) stock gasket kit was used ... but after start up all was well ... on test drive the familar smoke was back but not as bad ... is this a possibality of a warpped head ? ( no it was not sent to a shop to be re-worked ) is their anything else that would cause smoke in the exhaust like that ? sorry for odd n maybe simple questions ... just n unknown territory thanks

02-10-2009, 03:50 AM	#2
SilverBullet05 Intake Join Date: Jul 2008 Location: Iowa Posts: 44	Smoke i would have t osay you probablly should have taken the head to a shop to get lapped and atleast taken a hone stone to the block if it isnt able to go to a shop. it could be warped head possiblly the block, but it kinda sounds like the rings are a litl worn out. a little more info on the motor would be nice. Like miles on it before the rebuild would help. just my piece of mind. good luck. __________________ ALL BOOST NO JUICE! In need of some 7mge parts, let me know what you got.

02-10-2009, 10:53 PM	#3
supraspaz Stock Join Date: Feb 2009 Location: Bethlehem PA Posts: 5	tonight well tonight when i'm workin on it i'll get the info n if i can i will post the pic's of the 1st rebuild. lol hopefully you can get n idea of what it looks like. wish me luck ... when i rip it apart again oh im gonna send the head out this time to have it re-worked.

02-14-2009, 08:31 PM	#5
supraspaz Stock Join Date: Feb 2009 Location: Bethlehem PA Posts: 5	all is good well after using mass amounts of solvent. in the intake too i might add. i drove the car for about 15 minutes n then wow all was gone except a light blue (probablly the valve stem seals) puff on hard excel. runs smooth n no other signs of other issues (yet). will probablly do a mhg after i save n have some other small projects tackled on her. hopefully i can get some advice on the rebuild with mhg from everyone if possible. also if still waiting on the photos ... just a little longer ... i can't find my memory card. lol thanks again! oh any good places to get parts or web sites? just curious

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02-12-2009, 08:20 AM	#4
tsupranami Intake Join Date: Jun 2008 Location: Washington Posts: 32	Does it puff a big cloud on startup? Trailing throttle? If so, old, hard valve stem seals and worn rings are most likely culprits. Mine was mainly valve stem seals. I had over 200k miles, and cylinders looked like new, rings were worn but not past spec, still had over 160psi compression. But it would paint a nice film of oil on the rear bumper after a few hundred miles. Yuk. I had my head surfaced and new stem seals installed for $200, including reassembly. I didn't let them touch the valves or seats, as they were sealing just fine. They just removed them , then cleaned and replaced them. Then I installed a MHG w/ ARP studs and turned up the boost. Smoke has been gone ever since and no more oily bumper.