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-   -   7MGE Engine rebuild (http://www.toyota-supra.info/forums/mkiii-supra/14595-7mge-engine-rebuild.html)

Bill UK 09-23-2009 08:27 PM

I read your post 4.38 pm about the oil pressure, so I popped out to start the engine up, looks like you need to fire up the engine to get some revs before any sign of oil pressure as you found out. Excellent work can’t wait to see the video of the total rebuild; you did record it on video didn’t you? I recon you could sell hundreds of copies if not thousands worldwide.

Krem 09-23-2009 11:36 PM

Quote:

Originally Posted by oregonjoe (Post 73248)
Put the fuel pump fuse back in and connected the spark coil. Set the distributor to half way and shut the door.

Key in – turn, it starts.

OIL pressure gauge climbs up to normal pressure. Enough for the night.


Where might I find the fuel pump fuse on the mk3? I'd rather check for this and make sure that's not my problem before I go replacing the fuel filter and/or pump.. also, is this fuse the same thing as the fuel pump relay (which I think is located above the right front wheel well just under the hood?)

Also, what is "normal" oil pressure... this is the first car I've owned where I have a guage for oil pressure and within the two weeks of driving the car, I've noticed it'll go up around 40 psi when I start her up cold... within a few minutes, she's down to 10~12 psi and will build up to 20~25 with engine use/revs... Does this sound normal? too low? Maybe there's something I can check for or do to help keep the pressure up a bit more? Looking at the TSRM, it sounds like i'm running at the minimal threshold for oil pressure, but I also think: "It's nat. aspired... not a turbo, so the pressure shouldn't be towards the high end." but I'm no mechanic... two yrs of HS auto shop (one 9th and other in 12th grade) over a decade ago, I'm not as sharp on the subject as I'd like to be.

oregonjoe 09-24-2009 03:48 PM

Fuse/ OIL PRessure
 
Thanks Bill UK for checking that out for me.

The OIL pressure climbs to about mid scale or 40 PSI when cold which is were it has always been for this model. Rev it up and it goes to maybe 50-60, Hard to tell with these gauges. I am going to install a color after market gauge pod from CDI called the vGauge which will give me more accurate temp and pressure readings. Suction mounts to the windshield.

The fuel pump was disabled by pulling the EFI fuse in the fuse pod. Labeled EFI 15 AMP

My solution tot he dipstick problem was JB WELD. Mixed a little of that and now it don't move. Added a little RTV on top for insurance.

oregonjoe 09-24-2009 03:58 PM

startup update
 
Update on initial start – it was not a dream, car actually starts again!.

Ran it for about 15 minutes to get the thermostat open and get some water circulating. No bubbles in the coolant, no leaks on the asphalt.

Did two separate runs of 2 miles each with a cool down in between. Really smooth, just like it was off the show room floor. Has that nice new engine smell.

Got a few extra bolts left to locate. How many extra bolts do you need to still call it successful rebuild?

jcastro 09-24-2009 06:38 PM

dam that came out realy nice man congrats how long did it take u n i bet ur happy ass hell

oregonjoe 09-25-2009 04:12 PM

time
 
Quote:

Originally Posted by jcastro (Post 73317)
dam that came out realy nice man congrats how long did it take u n i bet ur happy ass hell

Total project was about 2 months working nights

10% Disassembly
15% Assembly
20% Figuring out what to do
55% Cleaning/painting parts

Costs about $1500
50% Machine shop work
30% Parts
10% Cleaners and rags
10% Beer

Things I should have done.

Purchased a high quality rebuild kit - most of my gaskets were cheap paper and I had to repurchase the head gasket,

Tell the shop NOT to paint the head.

Take a lot more pictures on disassembly

Use a lot more plastic bags for bolts and parts – label them with more detail.

Win the lotto so I could have bought more beer.


Krem 09-25-2009 04:27 PM

grats man :D I'm envious... mainly cause my ride is parked w/ a bad fuel pump and I'm not inclined enough to even replace that... let alone rebuild the engine... it came out very perty and clean... sorry to hear about the painted heads :\

cvbikeguy 11-25-2009 06:24 AM

Quote:

Originally Posted by oregonjoe (Post 72307)
I’ve taken the head and block to the shop to have them cleaned up and inspected. The head and valves looked good for 20 years of use.

The good news on the block is no cracks after the magnetic test – so its just a hone on the cylinders and good to go. The bad news is the shop wants $500 to do a valve job on the head – even without replacing any valves. Claim the 24 valves takes a lot of labor and that OHC need to be ground to adjust!

Attachment 2254

So – I took the head back to do a little porting and polish. The head had some casting marks and ridges from 20 years ago. Since I bought the car I have learned a thing or two about engines. One of which is that they are massed produced from casting molds. These molds are not all created equal and there can many flaws that are left as is in production. Some flaws include sharp ridges from casting seams and defects in the individual molds. Other are sharp angles from the machining process after the castings are poured. In production - they are all ignored.

Attachment 2255

The cylinder chambers in the head have some sharp edges that can collect heat and cause preignition so I ground them off to smooth the transitions out the valve ports. Careful to not touch the valve seats.

Attachment 2256

I focused on the exhaust ports and smoothed out the walls and take out any burrs and casting ridges. Just a little touch up on the intake side to remove any large defects as I understand its better to leave the “sandpaper” effect on the walls.

Attachment 2257

so you didnt have to take the head to the machine shop? will the replacement gasket be fine with just taking the block to the machine shop itself? sorry if im jacking your thread but this has been extremely helpful for me. thanks so much

oregonjoe 11-25-2009 04:05 PM

Head Shop
 
No - head was in shop for cleaning and resurface then I took it back once all the valves were removed to do the porting. Then - back to the shop to have the valve seats done, valves installed, and then adjusted with shims. Total machine cost for the head was $450.

You want tot do the porting before the valve seats are done so you don't mess up the seats. Critical since they determine adjustment and timing.

If you really want to do it right and can afford the time - take both head and block to machine shop so both surfaces can be done clean.

Then new head gasket will be fine - remember I used studs and tourqued down to 90 ft-lbs.

cvbikeguy 11-25-2009 07:30 PM

Quote:

Originally Posted by oregonjoe (Post 75277)
No - head was in shop for cleaning and resurface then I took it back once all the valves were removed to do the porting. Then - back to the shop to have the valve seats done, valves installed, and then adjusted with shims. Total machine cost for the head was $450.

You want tot do the porting before the valve seats are done so you don't mess up the seats. Critical since they determine adjustment and timing.

If you really want to do it right and can afford the time - take both head and block to machine shop so both surfaces can be done clean.

Then new head gasket will be fine - remember I used studs and tourqued down to 90 ft-lbs.

and you said the block was 400?

thanks so much for your help

cre 11-25-2009 07:37 PM

With the vGauge don't plan on using the stock oil pressure sender... the sender itself is internally dampened not the stock gauge.

cvbikeguy 11-25-2009 11:42 PM

oh another question. your block too a week in the machine shop....

but what about the head?

cre 11-26-2009 12:21 AM

It all depends on how busy the shop is. It took two days for me to get my head back. I had it hot tanked, vacuum tested, dye inspected, resurfaced, valve stem seals replaced.

cvbikeguy 11-26-2009 01:28 AM

sorry one more questions. im about to take my head off and i cant get the head bolts off. also im strippiing out the hex bolts trying to do so. any advice?

cre 11-26-2009 02:56 AM

Quote:

Originally Posted by cvbikeguy (Post 75304)
sorry one more questions. im about to take my head off and i cant get the head bolts off. also im strippiing out the hex bolts trying to do so. any advice?

I replied in your other thread.

Quote:

Originally Posted by cre (Post 75310)
When you remove the head bolts you need to clean out any and all oil in the hole and any debris which may have collected there; Failure to do so may prevent the allen bit from entering the opening completely.

If you cannot get a bolt out all the way using constant steady pressure AND the socket is in all the way you can try: Pounding downward on the head of the bolt a few times with a rubber mallet; Use a breaker bar and while you hold it FIRMLY in place have someone tap the end of the handle several timed with a hammer; AND, spray the area thoroughly with a GOOD penetrating oil (WD-40 does not count as a good penetrant).

As for the bolts you've already stripped, go to the hardware store and try to find an allen bit or regular allen wrench that's just a *tiny* bit larger than yours, it'll most likely be an SAE size unless you've got a shop in the area which can order .5mm bits. Take it home and tap it in with a hammer... you know the drill from there. Some people have luck with easy outs; Grinding the head off the bolt usually results in some heavy gouges in the mating area directly under the bolt head and as such getting an accurate torque thereafter is unlikely without having the area machined.... not to mention all the debris you'll have to worry about flushing out of the block. Note: If all you can find that'll fit is a regular L shaped allen wrench you can just cut it off and slip it into a regular socket. ;)

If I think of anything else I'll let you know.


EDIT: Oh, and don't be afraid to use a LOT of penetrant... it's cheap enough. Soak the bolts, wait an hour, soak again, wait another hour, soak again.... repeat a often as you wish, then let it sit for a few hours before going at it again. When you do go at it again make sure the allen is going in all the way before you try to remove the bolt.


oregonjoe 11-26-2009 03:54 PM

block cost
 
Block was $200 to shave and dip tank, check for cracks. The total Machine shop bill was $750 wich was head job, block and crank, and alot of cleaning (all intank manifolds and oil pan) I bit high but around here I am luck to get anyone who can work an import engine.

oregonjoe 11-26-2009 04:02 PM

Time in shop
 
The block did not take but 2 days to do - it was the head that took so long - 2 weeks. But the total time in the shop was over a month due to needing to find enough POP CANS to get it out.

BTW - The cylinders were only Honed but not boared so that saved some money. After 20 years they were still good but you really need to at least get them honed to get a good ring seal.

Been driving like new since the job.

oregonjoe 11-26-2009 04:03 PM

Sender
 
Quote:

Originally Posted by cre (Post 75287)
With the vGauge don't plan on using the stock oil pressure sender... the sender itself is internally dampened not the stock gauge.


True - I used all new senderds for this off a tee to keep the orginal

jones123 11-27-2009 10:07 AM

wow nice report, I vote for a sticky!! lots of good tips in here. Its almost like reading a step by step haha Thanks man!! hope it all works out for you!

cvbikeguy 01-01-2010 10:44 PM

small question
 
Quote:

Originally Posted by oregonjoe (Post 73234)
Once the Intake is in place you can place the main wire harness on top and run the connections for the Starter, VAC switches, Transmission Switch, Knock Sensor, and EGR temp down through the runners.

Attachment 2369 Attachment 2370

The connectors are color coded so it’s not too hard to match them up. You can reach under and attach the Knock sensor and VAC Can connection under the runners.

Attachment 2371 Attachment 2372 Attachment 2373

is this the same wire? and where does it go?

http://c4.ac-images.myspacecdn.com/i...66defb51bb.jpg

http://c4.ac-images.myspacecdn.com/i...50df62a4db.jpg

oregonjoe 01-02-2010 02:22 AM

Ghost connector.
 
What you appear to be holding is a ghost connection which I had on my 90 model. It did not go anywhere and I never connected it. It may be for turbo models or just a diag connector. I never found out what it was for but everything runs fine with out connected. Maybe for a Auto Tran since mine was manual?? Anyway wasn't VAC can as it had 3 terminals and was RED.

cvbikeguy 01-02-2010 02:31 AM

ok thank you

cre 01-02-2010 02:47 AM

Quote:

Originally Posted by oregonjoe (Post 76846)
Maybe for a Auto Tran since mine was manual??

I'm sure that's the case.

connormcd88MKIII 03-22-2010 02:23 AM

Im in the middle of replacing my blown head gasket. These pictures are great. My #6 went too. Just wondering if you knew the torque settings when tightening the new gasket?

cre 03-22-2010 02:41 AM

Bolts = 75ft. lbs.
Studs = 90ft. lbs.


If you're reusing the stockers check thoroughly for bad threads, pitting, and measure to make sure they're still within spec.


NOTE!!!! Torque specs change depending on what you're lubricating the friction points with (Head, washers and threads of the bolt). Those I've listed are for use when using a GOOD moly based grease. Don't forget to chase the block's threads too!!!!

cvbikeguy 03-22-2010 03:22 AM

Lol did my arp's at 85

oregonjoe 03-22-2010 02:26 PM

Torque
 
Did my ARP studs to 90 with lube.

Depends on gasket. Metal?

I think stock was 55 but everyone now seems to go at least 70

cre 03-23-2010 12:46 AM

Quote:

Originally Posted by cvbikeguy (Post 80441)
Lol did my arp's at 85

On studs I hope... that's a lot more than you want to torque bolts to.... unless they're just lubricated with 30 weight motor oil and not moly.

907mge 03-23-2010 01:58 AM

for anyones info, i found a strap wrench worked well to get the cam gears off on mine

cre 03-23-2010 02:12 AM

I just stick a socket on one of the bolts holding the back plate on with an extension on it. Gear turns, spoke stops at the socket and extension and you're done. Strap wrench would definitely work well if they have a larger one on hand.


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