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XFi Rebuild Tips?
Topic Started: Feb 11 2013, 07:03 PM (678 Views)
Hydrojim
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I'm planning to rebuild the engine in my 1993 XFi and I have a few questions?

Is the XFi Piston ring set from Hastings any good?
http://www.store.partsdinosaur.com/product2113.html

I'd like to keep the 2 rings and pistons to A) save money on pistons and B) less engine friction. I also don't want to be burning oil and be in need of a rebuild anytime soon so if it's worth it for me to purchase new pistons, let me know.

What does swirl Polishing a valve do?
I see 3tech offers the service on his valves, but I'm not sure what the point is.

Exactly what all seals and gaskets do I need?
I'm going to be getting the No Blow Gasket off ebay, but beyond that, I'm not sure what all I'm going to need.
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Coche Blanco
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I wouldn't get the no blow until he fixes that one opening that leaks. I would also get the three ring pistons and oversize the engine. Reusing piston rings is hard, and unless you're OCD Dan-O, probably impossible to to do without fudging it up. (I'm assuming this is your first rebuild)
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Hydrojim
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Coche Blanco
Feb 11 2013, 07:20 PM
I wouldn't get the no blow until he fixes that one opening that leaks. I would also get the three ring pistons and oversize the engine. Reusing piston rings is hard, and unless you're OCD Dan-O, probably impossible to to do without fudging it up. (I'm assuming this is your first rebuild)
Which head gasket would you recommend? I was under the impression that the no-blow were the best out there?

To do an engine oversize, I would need the engine bored and then I would have to get pistons and rings to match to bore? so if the cylinder is bored out .10 than I need to get rings and pistons that are also .10 over?

Honing and using regular sized pistons and rings sounds kind of nice though

My dad will be watching out for me, but this is my first rebuild and I've insisted on doing everything myself so I'm trying to learn all I can.
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Coche Blanco
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Hydrojim
Feb 11 2013, 07:56 PM
Which head gasket would you recommend? I was under the impression that the no-blow were the best out there?

To do an engine oversize, I would need the engine bored and then I would have to get pistons and rings to match to bore? so if the cylinder is bored out .10 than I need to get rings and pistons that are also .10 over?

Honing and using regular sized pistons and rings sounds kind of nice though
Beck/Arnley (or wait until the Dvorak gasket is fixed)

Yes, that's how it works. It's more expensive but worth it

It does sound nice, and it's easy as pie, but...it won't last as long as boring the engine. Assuming it needs it.
Edited by Coche Blanco, Feb 11 2013, 08:22 PM.
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Hydrojim
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Any idea what it might cost to get a block bored and shaved? might be nice to have an engine come back nice and shiny instead of trying to clean it myself.
Edited by Hydrojim, Feb 11 2013, 08:25 PM.
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dayle1960
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Fastest Hampster EVER

How many miles on the xfi? Was it thrashed by the PO? If you have the ability to do the rebuild yourself, you will save some money.

My experience is to purchase the parts you need from partsdinosaur.com. Good parts plus you will have quick delivery. You can accomplish a rebuild over a long weekend. Make sure you have all of the tools you will need before you start. If you don't have access to an enclosed shop to drive your metro into, make darn sure you choose a weekend that will be warm and free said of incliment weather. Working in these tight spaces with frozen fingers and water dripping down your back sucks.

No need to deck the head unless it has pits on the edges. Just scrape the old head gasket off and hit the mating surfaces with 2000 grit sand paper. Be gentle. No need to use extreme force, just try to get the old crap off.

Good luck
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Deleted User
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Before you do anything else . . .

Buy a Factory Service Manual.

Read it.

Understand it.

Test on Friday.

:rtfm

Before you do anything to your engine, determine if it needs to be overhauled.

Measure everything before you order any parts.

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Heavyhook
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One thing first time engine builders mess up on is getting in to big a hurry to order parts before having your machine shop determine what oversize your piston bores need to be if any and is your crankshaft still usable or just needs turned .010/.010 or maybe only polished? You would not want to get a call from the machinist only to inform you a head is cracked or even worse found a unexpected problem with the engine block! I firmly believe having your block hot tanked is one of the best dollars you could spend. Cleanliness is the basis of a quality rebuild thru every step of the process, and it starts with the block. And what did GeoGlenn say about the Factory Service Manual. Theres 101 spec's that you will need when assembling a engine. First question on Fridays test is where do you get this information ? :'(
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Heavyhook
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One thing first time engine builders mess up on is getting in to big a hurry to order parts before having your machine shop determine what oversize your piston bores need to be if any and is your crankshaft still usable or just needs turned .010/.010 or maybe only polished? You would not want to get a call from the machinist only to inform you a head is cracked or even worse found a unexpected problem with the engine block! I firmly believe having your block hot tanked is one of the best dollars you could spend. Cleanliness is the basis of a quality rebuild thru every step of the process, and it starts with the block. And what did GeoGlenn say about the Factory Service Manual. Theres 101 spec's that you will need when assembling a engine. First question on Fridays test is where do you get this information ? :'(
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