My winter rebuild (7MGTE overhaul)
12-06-2005, 01:09 PM
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My winter rebuild (7MGTE overhaul)
Ok so earlier this calendar year i finally got the old 7MGTE to run after a year and a half of hang ups but eventually i got all the major bugs worked out and it drove reasonably well besides the INCREDIBLE oil leak (about 4-5 quarts over the longest drive i made of 3 hours commute + 2 hours wheeling at uwharrie) which is needless to say un-acceptable. You shouldnt have to remember to bring your six-pack of oil with you just for a day-trip. It also wouldnt boost above 4-5 psi i believe due to my home brewed air intake from pieces i had laying around.
I had replaced EVERY oil seal on the motor and it still leaked at the same rate immediatly following and forever after the replaced seals were installed. This included the front and rear main seals, the oil pump driveshaft seal, and both the intake and exhaust cam seals.
My plan for the winter is a complete teardown and rebuild of the motor including:
- +.020 over bore the cylinders w/ JE pistons and rings to match
- ARP head studs
- Machine headgasket mating surfaces
- Titan Racing Metal Headgasket
- replace bearings as needed upon inspection
- possibly a head rebuild depending on condition upon inspection
- replace all the exterior oil seals AGAIN
MVP Motorsports MK3 supra Engine Parts
Other plans for the winter include learning to use the welder i just ordered. Its a 180amp max Hobart Mig welder. I wanted to spring for the 210 but i think this is plent to learn on and if i want to upgrade in the future after i learn what im doing i can always sell this one.
With the welder i plan to fabricate a complete intake/intercooler setup that will actually hold pressure. I also plan to make a whole new exahust that DOESNT hang below the frame by removing the horseshoe collar and replacing it with a support higher and farther back. I also need to fabricate a sturdy support system for the new aluminum radiator i'm getting so i dont have any repeats of the last Uwharrie trip (zip ties should NOT function as the sole means of radiator support
)
Lastly I plan to remove the 2inch body lift since the truck is too tall as it is and i have MORE than enough room for the 35inch MTRs without even trimming. To do so i have to cut the firewall and transmission tunnel and weld in my own sheet metal to accomidate the 2inch drivetrain lift.
That should about do it. If i complete all those tasks and gear the front to match the 5.29/ARB rear she should be pretty damn respectable on the trails.
I had replaced EVERY oil seal on the motor and it still leaked at the same rate immediatly following and forever after the replaced seals were installed. This included the front and rear main seals, the oil pump driveshaft seal, and both the intake and exhaust cam seals.
My plan for the winter is a complete teardown and rebuild of the motor including:
- +.020 over bore the cylinders w/ JE pistons and rings to match
- ARP head studs
- Machine headgasket mating surfaces
- Titan Racing Metal Headgasket
- replace bearings as needed upon inspection
- possibly a head rebuild depending on condition upon inspection
- replace all the exterior oil seals AGAIN
MVP Motorsports MK3 supra Engine Parts
Other plans for the winter include learning to use the welder i just ordered. Its a 180amp max Hobart Mig welder. I wanted to spring for the 210 but i think this is plent to learn on and if i want to upgrade in the future after i learn what im doing i can always sell this one.
With the welder i plan to fabricate a complete intake/intercooler setup that will actually hold pressure. I also plan to make a whole new exahust that DOESNT hang below the frame by removing the horseshoe collar and replacing it with a support higher and farther back. I also need to fabricate a sturdy support system for the new aluminum radiator i'm getting so i dont have any repeats of the last Uwharrie trip (zip ties should NOT function as the sole means of radiator support
) Lastly I plan to remove the 2inch body lift since the truck is too tall as it is and i have MORE than enough room for the 35inch MTRs without even trimming. To do so i have to cut the firewall and transmission tunnel and weld in my own sheet metal to accomidate the 2inch drivetrain lift.
That should about do it. If i complete all those tasks and gear the front to match the 5.29/ARB rear she should be pretty damn respectable on the trails.
Last edited by NCSU-4runner; 12-06-2005 at 01:24 PM.
12-06-2005, 01:10 PM
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Approximatly where i plan to cut the firewall
you can see a crease where the motor and my BFH have negiotiated with it already before i remove the body lift.
you can see a crease where the motor and my BFH have negiotiated with it already before i remove the body lift.
Last edited by NCSU-4runner; 12-06-2005 at 01:21 PM.
12-06-2005, 01:12 PM
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I also plan to cut the floor out of my rear cargo area and recess the fuel cell down as far as possible. The soft-lines will also be replaced with stainless hardlines since i'm sick of the mild gas smell every time i get in the car since i didnt buy teflon lined flex lines. With these lines the gas smell can slowly leak through the lines.
current setup:
current setup:
Last edited by NCSU-4runner; 12-06-2005 at 01:14 PM.
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12-07-2005, 05:52 AM
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I forgot about electronics. Right now i plan to purchase an AVC-R (actuator valve controller) made by Apex-i and a MAP ecu piggyback from Powerhouse Racing. The AVC-R monitors boost pressure and injector duty cycle and then controls the waste-gate based on these inputs allowing complete control over the function of the turbo on the fly. The MAP ecu replaces the speed-density type air flow meter with a Manifold Absolute Pressure sensor which in conjunction with a wide-band O2 sensor allows for accurate and safe control over the fuel map. It is also completely customizable from a PC interface. The MAP ecu allows for complete removal of the restrictive AFM as well.
These electronics will function to control the stock turbo for now but if all goes well she will be getting upgraded injectors and something in the range of a 58-62 mm T4 style turbo sometime.
Work begins as soon as exams are over next week.
These electronics will function to control the stock turbo for now but if all goes well she will be getting upgraded injectors and something in the range of a 58-62 mm T4 style turbo sometime.
Work begins as soon as exams are over next week.
Last edited by NCSU-4runner; 12-07-2005 at 05:53 AM.
12-07-2005, 05:55 AM
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Originally Posted by waskillywabbit
Sounds like you got a busy winter ahead...hope that garage has a heater. 
the garage is completely surrounded by heated space except for the door to the outside so it actually gets passively heated quite well. If its say 30 F outside it wont be less than about 55-60F in the garage if its about 70F inside the house. Obviously i dont leave the garage door open when im working in there
Last edited by NCSU-4runner; 12-07-2005 at 06:02 AM.
12-07-2005, 05:58 AM
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I was looking at the truck last night and im gonna have to cut the sliders off the frame and weld them back on a bit lower. The guy that made them put them really tight to the body, which was what i wanted but isnt conducive to removal of the body lift.
12-07-2005, 04:35 PM
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Your 4Runner is so nice! Makes me drool every time I see it. 
Have you looked at any of the SP turbos? This guy has one on his supra and it seems to have a pretty nice torque curve. It the very last one down at the bottom of the page:
http://www.7mpower.com/top10.shtml#
Have you looked at any of the SP turbos? This guy has one on his supra and it seems to have a pretty nice torque curve. It the very last one down at the bottom of the page:
http://www.7mpower.com/top10.shtml#
12-07-2005, 05:24 PM
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yea, a 57-58mm or so was about what i'd like to do but the SP turbos are pretty expensive. If the truck makes you drool now wait another year or so.
Last edited by NCSU-4runner; 12-07-2005 at 05:34 PM.
12-08-2005, 06:41 PM
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Ill try not to let you guys down 
i'm finishing up my semester exams this coming tuesday then i hope to put in at least 2 hours a day in on it every day after that.
Been looking at turbo's and if/when its ready for something nice i think these will do just perfect.
stainless steel turbo manifold w/ external wastegate port
T04E, 57mm
i'm finishing up my semester exams this coming tuesday then i hope to put in at least 2 hours a day in on it every day after that.
Been looking at turbo's and if/when its ready for something nice i think these will do just perfect.
stainless steel turbo manifold w/ external wastegate port
T04E, 57mm
