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03 XFI rebuild
Topic Started: May 27 2010, 05:38 PM (2,348 Views)
BraveHeartCalif
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Hello from California. Ive been lurking on the forum and now decide to join so im glad to be here. So after much reading on the best site on the net for the xfi. I did a dry compression test today and #1 came at 150 #2 95 and #3 150 on my 2003 geo xfi.
That tells me the #2 is real bad. Interesting though it still passes calif smog and no smoke out the pipe. I talked to a mech today and i guess i have to order some rings for this thing. Since i have to tear into it ive been thinking about getting the:

1) gapless rings w/ the DIAMOND FINISHâ„¢ from http://www.totalseal.com/
2) and http://geometroforum.com/pages/heads with the stainless steel valves.
3) pistons
4) timing belt
5) gaskets
6) head bolts
7) water pump

Am i missing anything?
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Memphis metro


Valve seals.

03 model with how many miles? How does it run? You say it does not smoke. I think you meant 93 model. I was thinking the same thing tyler.



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Edited by Memphis metro, May 27 2010, 06:17 PM.
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wikityler
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Some say...

BraveHeartCalif
May 27 2010, 05:38 PM
2003 geo xfi
No such thing. Check the date of manufacture stamped on the door jamb label.
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BraveHeartCalif
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Brain fart i was thinking of my 2003 7.3 diesel excursion i own. I meant my 93 xfi..thanks ;)
EngineDoc i have about 182k on it...runs ok, the car is really clean actually except for #2 cyl is 95 :/
It gobbles about 1/2-3/4 a month.
Do i need valve seals if i buy a complete head package from 3 tech?
id like to keep this xfi so it go another 100k if possible. Doing a good rebuild right might time - wacha think?
Edited by BraveHeartCalif, May 27 2010, 06:21 PM.
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Memphis metro


Well you can spend as much as you like. Not sure about 3 tech package. If the car is running good and you are just wanting to get that second cylinder going, I would consider snatching the head off and taking a look at them valves. Its possible you could just get by with just lapping them and putting it back together and being out no money or at most out the price of a headgasket and maybe a valve or two on that cylinder. It would all depend on what it looks like when you get into it. If it aint smoking I would think twice about doing the rings. You might want to do Johnnys method of checking them when you get the head off. Of course I am thinking cheap. Rebuilding is a decision only you can make as to how far and how much you want to do. Car is definately worth fixing up either way.








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Edited by Memphis metro, May 27 2010, 06:28 PM.
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BraveHeartCalif
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hmmmm thats worth looking into. Do you have a link for johnnys method? ill try to look for it too...
If i replace the valves say with Stainless say the ones from 3tech for cyl #2. Would it makes sense from your experience w/ these xfi's to replace all 3 valves since i already popped off the head?
Edited by BraveHeartCalif, May 27 2010, 06:29 PM.
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Memphis metro


There again, its really depends on what you find and your pocket book. You could just do a complete head job or address the compression problem and lap all valves. Just pour some fuel carefully on top of the pistons and see if they leak down over several minutes.
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Potter
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Col. Potter

yes it will be worth it to replace all 3 because even if you do the one eventualy the rest will burn. also id take a look at the EGR valve as well because of the carbon build up that these engine puts out it will clog the egr and burn the valves.. mines burnt in the number 3 hole.. myself im fixing this problem by doing all new valves in a 3 tech head package but i do not recomend it for the Xfi since it has 1 less ring on the piston, a pre advanced camshaft and a higher geared transmission. the xfi gets better MPGs and better low end power over the base model. wile your in their check the pistons as well to see if they need to be re ringed. cant be too carefull. but the valves will help a TON and keep you going for quite a while. :thumb
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Johnny Mullet
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Fear the Mullet

If you are getting a complete head package from 3Tech, you don't need anything for the head. Get the economy package head and you can recoup $100.00 or more by selling the genuine XFi camshaft.

With that many miles, I suggest doing the bottom end also. It will pay you back.
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Bad Bent
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Facetious Educated Donkey

Welcome to the forum, BraveHeartCalif! :coffee
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convertible


Welcome to the forum. Hope you enjoy.
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BraveHeartCalif
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Thanks for the welcome Bad Bent and convertable :)
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BraveHeartCalif
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Talked to my machine shop/mechanic today re: the cyl. and honing the cyl. block. Regarding pistons, if im to replace the rings using a gapless say from total seal. The cyl walls needs to be honed/bored so ill need a xfi 2 ring piston thats oversized abt 1/2 mill. Does this exist? If not does this mean i have to go to the standard 3 ring piston? Im wondering how many MPG ill be giving up if i go that route. But what other choice do i have :/
Edited by BraveHeartCalif, Jun 4 2010, 07:16 PM.
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mcmancuso
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I'm not seeing any oversize pistons in the xfi style, if you need .020" oversize you'll have to go with regular 3 ring pistons. I don't think you loose much there though. Most of the difference in the engine is the cam and computer system as far as mileage goes on these.
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BraveHeartCalif
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Thanks mcmancsu. I googled and looked all day and nothing came up for anyone selling an new set of 2 ring XFI piston at .020" or even a stock one for that matter :/

Looks like Dinosaur parts has the 3 ring piston made by ITM Engine Components or Rock Products. Is one MFG better than another? Does anyone know if one piston made by one company is better than another?
Edited by BraveHeartCalif, Jun 5 2010, 10:25 PM.
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