Rebuilding motor

[Chrisj485]

What is exactly replaced or "refreshed" when rebuilding a motor so that it will run "like new"?

 

[want_a_gsx]

oh man, thats a VERY broad question...

To start out, it might help to know what is wrong with the motor. For example, if the rings are shot then you obviously need new rings; if the pistons are shot then you definitely need new pistons etc...

But to answer your question, you need:

Maintenance (you don't want to take a chance on your oven fresh motor):

Timing belt and accesories-- Timing belt, timing belt hydraulic tensioner, idler pulley, tesioner pulley

As of the balance shaft- You are better off eliminating it (get a balance shaft eliminator kit, duhhh)

Spark plugs and wires

Motor "parts": New pistons & rings, main and rod bearings, water & oil pump

Bottom end- Most likely, your rings are shot, so you will need new rings. If I were you, I would also get new pistons (I believe these include the rings).

Now, dont be buying pistons and stuff yet. You first have to figure out what kind of condition your block is in. You will definitely need to hone the block. If the cylinder walls are badly damaged, you will need to bore them. So if you bore the block lets say ".020 over," you will need .020 overbore pistons etc. Remember, the block must be cleaned before all this.

Head: The head can probably very "worn out," you might also need to rebuild it. You will have to take it to a machine shop and have them diagnose the condition that it's in.
If the valves had a tea party with the pistons, those will definitely need to be replaced. To tell you the truth, I dont know crap about wear and tear in a head, so I'm not gonna start babbling.

I know I'm forgetting a thing or two, but this will kind of give you an overview of what needs to be done.

Good luck. I'm going through all this right now, and it's a lot more work that I thought would be. Your best bet is to RESEARCH and get a manual or two.

 

[perley03]

oh man, thats a VERY broad question...

To start out, it might help to know what is wrong with the motor. For example, if the rings are shot then you obviously need new rings; if the pistons are shot then you definitely need new pistons etc...

But to answer your question, you need:

Maintenance (you don't want to take a chance on your oven fresh motor):

Timing belt and accesories-- Timing belt, timing belt hydraulic tensioner, idler pulley, tesioner pulley

As of the balance shaft- You are better off eliminating it (get a balance shaft eliminator kit, duhhh)

Spark plugs and wires

Motor "parts": New pistons & rings, main and rod bearings, water & oil pump

Bottom end- Most likely, your rings are shot, so you will need new rings. If I were you, I would also get new pistons (I believe these include the rings).

Now, dont be buying pistons and stuff yet. You first have to figure out what kind of condition your block is in. You will definitely need to hone the block. If the cylinder walls are badly damaged, you will need to bore them. So if you bore the block lets say ".020 over," you will need .020 overbore pistons etc. Remember, the block must be cleaned before all this.

Head: The head can probably very "worn out," you might also need to rebuild it. You will have to take it to a machine shop and have them diagnose the condition that it's in.
If the valves had a tea party with the pistons, those will definitely need to be replaced. To tell you the truth, I dont know crap about wear and tear in a head, so I'm not gonna start babbling.

I know I'm forgetting a thing or two, but this will kind of give you an overview of what needs to be done.

Good luck. I'm going through all this right now, and it's a lot more work that I thought would be. Your best bet is to RESEARCH and get a manual or two.

You are pretty much all set on the block part, but you forgot a few things. The crank journals, including the crank itself, needs to be mic'd to see if its beyond specs. Also the block deck needs to be checked for flatness. If its out of spec, it needs to be decked, to near perfectly flat, especially if you are going MLS on the head gasket.
As far as the head, the valves, seats, springs, retainers, guides, and rocker arms all need to be checked for clearances. If you use new valves, buy new seats, guides, and new valve stem clips. Also retainers need to be checked for gouges from the springs. I would replace everything, but that can get costly. Also the cam journals need to be checked, as well as the camshafts for clearances.
It would be wise to completely disassemble the whole head, and have it pressure checked and magnafluxed to find any cracks, and have the deck checked as well, before any parts are ordered for the head, incase the head comes out to be junk.
If you don't know what you are doing, when it comes to building an engine, stop, and hire a professional. Don't skimp out on any part, if it doesn't meet specs, buy a new one. Do it once, do it right. Engine rebuilds are costly, and I don't know anyone that can just throw a few thousand dollars down the hole, and hire someone to build it right. Remember when you are putting this engine together, everything needs to be checked for clearances and endplay. It all has to go together one piece at a time, and that part needs to be checked. I highly advise anyone who attempts to build a motor for the first time to pick up a book on engine rebuilding, one that goes in depth about the process, and also have someone there who knows what they are doing to help you out as well. It makes it a much more enjoyable process, and less of a headache.

 

[brandonzero0]

you can check flatness for cylinder heads yourself with some sort of straight edge or a machinist straight edge at your high end auto patrs store has them. you can check the bore of the block, but for this you will need an inside micrometer and nomral mic.

 

[brandonzero0]

you can check it tall yourself if you are fimiliar with the instruments, mic's , calipers straigh edges, i did my engine form the ground up and almost done just need a cylinder head, at my local shop they charge 60 just to check for, flatness,cracks, how much vacuum each cylinder pulls not all people have all the required tools for tihs so they have to spend the money. but its a must to have it all checked if you cannot. worded odd

 

[want_a_gsx]

you also need a complete gasket kit