My 7M had been running great for about 8 months with a new oem headgasket and ARP bolts. I was driving around town and floored it in 2nd and when I let off it was only running on 5 cylinders. I drove it 1/4 mile back home with no unusual noises and good oil pressure. I took off the oil fill cap and it was puffing blowby from one cylinder. The next day I tested the compression and found cylinder 4 had 60 psi, all others had 160. The motor had almost 300K on it. I don't know if I should find a shop to rebuild the engine (don't know who I can trust), buy a brand new 7M shortblock from toyota for $3K, or swap in a JZ. I don't have a lot of cash to throw around but I will stretch the project out to afford what I need to so the car is done right. I want it to be extremely reliable and have about 350rwhp. What should I do? :1zhelp:
Blew my 7M, what should I do?
- Thread starter jake8790
- Start date
for 3k, you can fix it yourself and make that hp you are looking for. total rebuild man, rip the thing apart and slap in some npr pistons from driftmotion if you're on a tight budget, get the head checked to see if its straight and not cracked and so on. decide what type of head gasket to use, if metal then deck the block. good luck
I'm confident about working on the motor but I've never dealt with changing bearings or sizing pistons before. I'm assuming the machine shop will tell me what sizes to order, then I can bring them the parts so they can machine the block for the correct tolerances?
hello jake, i have built 8 7mgte's and i can tell you the most important part is to get that head and block FLAT then get some arp studs (bolts just don't cut it on this motor) then get a nice MHG and some probe pistons from driftmotion
its VERY important that you take your time with this if you rush it you will fuck up and have to do it all over again
so you need to sit down find a nice machine shop and check it out, for any other questions go here http://www.supramania.com/forums/showthread.php?276-Specific-7mgte-Rebuild-Tips
that link is the bible as far as i am concerned.
Good luck!
its VERY important that you take your time with this if you rush it you will fuck up and have to do it all over again
so you need to sit down find a nice machine shop and check it out, for any other questions go here http://www.supramania.com/forums/showthread.php?276-Specific-7mgte-Rebuild-Tips
that link is the bible as far as i am concerned.
Good luck!
well before we go rebuilding the motor, id take the head off and see why comp is low in that cyl.
ifyouaint1sturlast
Banned Scammer - I'm whitemike.
bioskyline;1824874 said:
+1, could just be a valve or something simple! Unless you were already thinking of rebuilding seeing how it had 300k.
First you need to figure out what happened. Then, I'd find a good machine shop (one that isn't the "NAPA machine shop") and have them go over the block and heads. a full rebuild on a 7M isn't too expensive. Provided you didn't crack or warp the block you can reuse the one you have.
New bearings, block machined for a HMG, head job, new oil pump, etc..
Good times!
New bearings, block machined for a HMG, head job, new oil pump, etc..
Good times!
Even if it's something simple i'm going to rebuild it because of the mileage and so I can run a MHG. I will be installing ARP head studs and most likely ARP hardware in the bottom end as well. I was planning on using Driftmotion's upgraded oil pump. Any tips for finding a good machine shop? Should I just call and ask if they've done 7M's?
Look for a built 7M, 80% of the time you'll be able to find a fully built motor for cheaper than it would cost to do it yourself.
83Restomod has a built 7M for sale for super cheap. I have done business with him. He bought a 7M fuel rail from me.
Contact him, he is in NJ so it will need to be shipped to you but that shouldn't be so expensive. When you total it out, it will be cheaper, a lot cheaper, than doing it from scratch.
Shoot him a PM.
Contact him, he is in NJ so it will need to be shipped to you but that shouldn't be so expensive. When you total it out, it will be cheaper, a lot cheaper, than doing it from scratch.
Shoot him a PM.
You could pull the motor yourself and then dissassemble it. Then you could take take it to a machine shop and have them rebuild it with most of your stock components. If I remember correctly, it cost me about $1200 for the shop to do all the machine work, balancing and assembly of my 7M, and that included new bearings and all the ARP fasteners. (I supplied the forged rods and pistons).
Edit, then obviously you add the cost of the new headgasket, oil pump, and water pump. About $350. And consider getting your head rebuilt.
Edit, then obviously you add the cost of the new headgasket, oil pump, and water pump. About $350. And consider getting your head rebuilt.
