Rebuilding engine

[IronfistPB]

1.what does it mean to have an engine rebuilt? Like what do they change/fix/replace?

2.What parts go in or come out?

3.Whats the use of having an engine rebuilt? Does it make the engine like new or something.

4.on average for an import inline 6 how much does it cost to rebuild it yourself or to have someone else rebuild?

5.what type of tools and knowledge do u need to do this yourself? do those like 150$ full service manuals mechanics/dealerships use show you how to do this?

thanks a lot in advance

[TatII]

usually when you rebuild the engine there are a few different kind of rebuilds

for a open deck like a honda engine, if you want to rebuild it for strenght, you need to machine the block and put sleeves in. the sleeves will prevent the cylinder walls from flexing.

for closed deck engines like my KA, all you gotta do is hone the block. its basically putting the block on a deck, and they have this big milling machine with the big stone that you put into the cylinder walls to smooth out the walls.

also you need to deck the block. if the block or head was warped, you need to mill out the top of the block or the head to make it perfectly smooth so that when you put another head gasket, it won't leak

also you need to rebalance the crank shaft if you are to change compression ratio's. this is becusae the piston will be at a different height and the stock counter weights on the crank shaft is not balanced for the new piston top dead center height. so you need to rebalance it so it won't mess up on you at highrevs

also you need to change the pistons, and new rings. along with rods ( optional )

if you have a timing chain, it is wise to put a new chain and chain guilds. becuase over time the chain itself does stretch.

[IronfistPB]

thanks, how much would this normally be? like on a maxima engine or a ka in s13 240's?

[Auto_newb]

What is a closed deck or open deck engine? Could you show me a pic and explain differences?

[TatII]

a open deck is basically a block with a opening around the cylinder wall. its kinda like a ring of empty spaces where the water jackets are for cooling, and for weight reduction purposes. a closed deck is just a solid deck of a block.

edit:http://images.google.com/images?q=op...-8&sa=N&tab=wi

[Auto_newb]

Oh I see, so a closed deck would have those "tunnel" like things around the inside of the engine for the water to cool the engine right?

[TatII]

no you got it backwards. the "deck" is the top flat part of the block. you see the link that i linked you. the deck is not flat or closed. it has large openings. this is why open deck designs are not as strong, and needs to be sleeved. as you see in the middle picture, you see a sleeve thing goin into the water jacket to re enforce the block. on a closed deck, the block would be almost a solid deck of iron or alumium ( depending on what material the block is made out of )

[-Josh-]

You know nothing about engines or components, and your going to jump right into an import engine assuming that engine repair and rebuild is easy stuff. Good luck.

[IronfistPB]

shut up asswipe im asking questions so i can learn. if you wanted to post a sarcastic statement please do it somewhere else. why waste time posting if you know your not helping or answering anything i asked

[turbo2nr]

i smell flaming starting.. should be intresting..
1

[chevytrucks92]

I know nothing about imports, but when you rebuild any engine, you have the block checked for inperfections (usually, you will have to either get it sleeved, or bored), buy new pistons (they will shrink), rings, bearings, have the rods sized or replaced (they will stretch), have the crank turned or replaced (turning the crank is simply shaving or grinding it to meet tolerances for new bearings), new oil pump, new cam(s), (for OHV engines-new lifters/rockers/push-rods), have the valves checked (possible to have bent and/or valves not properly seating), and new valve springs (for OHV, if you dont change lifters/rockers/pushrods, atleast get new springs), and a new timing set(whether that be a chain with gears or a belt).

Some people just overhaul the bottem end, and so you do everythign minus the head work. And I again, I have no idea about the cost for import engines, but to do what I said for a small block Chevy, you're gonna pay about $1500 (probably get by cheaper if you do teh work yourself, but I don't of anyone that can bore a block, size rods, or turn cranks at their homes, lol-so you'd atleast have to take the block to a machine shop)

[duplox]

I recently rebuilt my motor(and am currently rebuilding it AGAIN. machine shop fucked up!), and it aint cheap. This is what I had done, and what needs to be done. Lots of people have given the basic outlines, but there is a lot more than they said for a FULL rebuild..
Block magnafluxed(checked for cracks) and sonic checked if neccesary(recommended if over a .030 bore is required on a thin wall block). Block needs to be cleaned...
Bored or honed, depending on what is needed(over time the rings on the pistons wear away at the cylinder walls, resulting in poor sealing)
Rods need to be reconditioned(magnafluxed/resized), new pistons are needed. New pins are needed. New rings. Crank has to be checked for cracks, turned down if neccesary, and micropolished.
Rotating assembly has to be rebalanced.
New main bolts, new head bolts, all new gaskets, all new bearings. New cam(s). New lifters/pushrods/rockers/retainers/locks/valves, whatever is neccesary. New timing set. New oil pump, new fuel pump(if mechanical), new oil pump driveshaft, valve seats need to be recut, deck of the block has to be honed flat, heads have to be milled flat. If its a fuel injected engine, I'd spring for new injectors. If its carb'd, new carb or rebuild the old one. Doing all the work myself, my last motor was built with about 3/4s of all this stuff, plus some stuff not mentioned(new intake, expensive rockers, etc) for around $2,500. I now know a lot more and can scrounge around for the best prices, so my current rebuild is costing me around $2000, and its a MUCH better build.

[SR240Z]

Originally Posted by Z28Josh

You know nothing about engines or components, and your going to jump right into an import engine assuming that engine repair and rebuild is easy stuff. Good luck.

That wasnt cool, he was trying to get information and he gets flamed for it??? come on

[GTStang]

Everyone of you basically has answered correctly but the term "engine rebuild" is very wide and up for interpretation. So what one's man idea of a rebuild is, is not the same as another. If I was to say at it's most base of terms.... it is to tear the engine apart, inspect and/or replace everything that needs to be.