Author Topic: Engine rebuild time, some questions!  (Read 2161 times)

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Mr_Random

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Engine rebuild time, some questions!
« on: August 21, 2008, 06:17:33 PM »
My jeep is burning oil at 2 quarts+ a week, lost most oil pressure, and on a non-mechanical note all fuel pressure.

Ironic that it crapped out the same day I sent money out for the last MPI parts I need.

Anyways, I have a line on four sealed power .020 over pistons for 25 bucks, good deal?

I plan on getting a new cam shaft, what do you guys recommend?

What is a good online parts store for engine rebuild parts anyways?

Just wanting to know what you guys recommend!

jcsanders79

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Re: Engine rebuild time, some questions!
« Reply #1 on: August 21, 2008, 10:21:48 PM »
Well, I have a stock 2.5L rebuild as well as a stock trans reb :sleep:.  The crazy part is I bought it thinking I'd upgrade but luck has it I did both in the first months on ownership!  Hmmm, $25 seems cheap, .020 seems normal, don't know about cam shaft just make sure you get a good rebuild!  These Q's should be easy for the local guys!  Much more than $2,000 for a rebuild and your getting screwed!

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #2 on: August 22, 2008, 03:14:09 AM »
Well never mind on the pistons, the guy just listed four pistons, not what engine they are for (because he doesn't know), but since it was on JeepForum I thought jeep automatically... but then again he said ".020 over" and listed the diameter, and I checked it against stock and it seemed right... so maybe I'll check the other measurements and see if they are correct...

And yeah, forgot about the tranny rebuild! I'm thinking either finding the dakota bellhousing and swapping in the ax-15, or buying a good ax-5...

and I'll do all the engine work with the help of my dad (minus machining), so I REALLY hope it's under $2000... haha.

Matt vs YJ

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Re: Engine rebuild time, some questions!
« Reply #3 on: August 22, 2008, 10:41:34 PM »
You should easily be under $2000 for a rebuild, but I wouldn't try to source everything online. I found a good local machine shop that bored the block .030 over, turned the crank, pressed in the cam bearings, and pressed on new pistons for about $400. They also supplied a master rebuild kit for about $300 (Pistons, Gaskets, Rings, Cam Bearings, Oil Pump, and Rod and Main Bearings).

That doesn't include any valve work, since I bought a complete new head from Alabama Cylinder Head ($300).

I ended up spending a little more on a Hesco RV0B4 Cam and lifter set, which I recommend since it's only about $100 more that a stock replacement cam.

The engine I rebuilt had a spun bearing, but if your block and crank are in good shape, then you'll probably spend a little less on the machine work than I did.

Your best bet is to wait and buy the pistons after you have the block bored/honed, cause you might need .030 over to clean it up, or you could be fine with just a hone and stock pistons.

I'm guessing that I spent about $1500 on the whole thing, but there were also lots of trips to the parts store for all the little things that eventually add up.

Offline aw12345

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Re: Engine rebuild time, some questions!
« Reply #4 on: August 23, 2008, 05:46:36 AM »
Well shop around, see what cleaning the block + boring and installing the cam bearings cost shop around for a reground crank 0.10 under preferably with no welded journals, welded trust journals are ok. Have the rods checked, to see if the bottoms end where the bearings shells go  is still round and to amke sure they are not bend or twisted. Also have the machine shop hang the pistons, Have the head magnafluxed resurfaced and a valve job done.  Just compare proces for all this stuff. Idefinitely prefer to get mown old engines rebuilt if the block has not beemn destroyed, with rebuilt engines you don't really know if you get somebodies past nightmare
2006 Jeep Wrangler TJ SE
2004 Jeep Wrangler TJ SE

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #5 on: August 23, 2008, 12:38:55 PM »
Well, did a compression test for now and it looks like I'm sporting a three cylinder engine!

It runs, but eating a quart of oil per week, if not more.

Deal blew over on the pistons, but I'm not worried, I couldn't pinpoint whether they were for the jeep or not anyways.

So the simple plan for now is;

Rod check, crank check and bearing replacement.
Block (at least) honed, magnafluxed, and shaved. .030 over if the stock pistons are shot.
Head shave, valve job, new valves (based on the fact that at least one is worn enough to be stuck open).
RV0B4 cam and lifter set! New valve springs and rockers if needed.
New oil pump if needed (will the 4.0 high flow one work on the 2.5?)
Then of course the expected stuff, gaskets, piston rings, oil seals, freeze plugs, etc.

I'm excited! Despite the jeep being down for a week or two, it's my first engine rebuild and will be a great learning experience!

I'll be shopping around with my dad and asking which shops are cheapest, most qualified, etc. It's also good to have neighbors that are constantly pulling their SBC's, BBC's, and BBF's with our cherry picker and using our hydrolic press... They'll be eager to help, but I'm sure I'll have to fight them about not putting an SBC in the thing... haha.

Everything sound good?

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #6 on: August 23, 2008, 12:47:19 PM »
boo to no editing! (sorry jeffy)

What do you guys think of .060 over? I know, more pricey and have to have the block checked for cylinder wall thickness... but more power is always fun!

and if the head work and valve train accessories exceed the price of an alabama head (don't expect it to, but who knows?), I'll just buy one of them instead.

Am I missing anything?

Offline Jeffy

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Re: Engine rebuild time, some questions!
« Reply #7 on: August 23, 2008, 12:51:10 PM »
boo to no editing! (sorry jeffy)

Am I missing anything?

Is waiting 5 seconds really that hard?  You have a 30 minute window after that...  :rtfm:
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #8 on: August 23, 2008, 01:21:38 PM »
Really? ah... sorry, do you keep changing it or am I just dumb? I waited 9 minutes and kept refreshing the page, never got anything. I'll see if I can edit this one after five seconds... Maybe I'm blind to that edit button...

acousticrawk

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Re: Engine rebuild time, some questions!
« Reply #9 on: August 23, 2008, 07:03:49 PM »
.060 over? hmmm. that might make for some power for sure. and if you deck the head and block just a hair to up the compression... let me know how it goes. i have a spare engine i would be willing to try that on if you had success. we'll start a "big bore 4" thread on here! haha.

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #10 on: August 23, 2008, 07:44:32 PM »
As you guys might have surmised, I couldn't edit my last post... but anyways...

I'm pretty sure I've seen at least one other .060 over 2.5... well at that point it'd be at... um... 2.8 or so?

Honestly, I wouldn't care if I had to run up to premium on this, it's a whole 4 or 5 bucks more per tank, wouldn't kill me!

The only reason I'd want to significantly deck the block would be to get proper quench, I'd also dish the pistons then to keep a lower compression...

Really, if I was going to go through that much work I'd stroke it, too. I just threw the .060 out there as an option, I honestly want this to be as easy as possible... I'm going for .030 for sure, but if there's no downside, I'll go larger!

Anything troubling to look out for when doing a rebuild on the ol' 2.5?

Offline aw12345

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Re: Engine rebuild time, some questions!
« Reply #11 on: August 23, 2008, 11:13:13 PM »
I am not to crazy about boring to 0.60 but hee its your money and your engine
2006 Jeep Wrangler TJ SE
2004 Jeep Wrangler TJ SE

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #12 on: August 24, 2008, 01:10:55 AM »
I am not to crazy about boring to 0.60 but hee its your money and your engine

That's why I'm asking you guys, I'm wondering how bad of an idea it is...

You know, I'll just stick to .030, If there is ANY question on whether .060 is reliable, I won't trust it with my money...

thanks guys and stuff! haha

jcsanders79

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Re: Engine rebuild time, some questions!
« Reply #13 on: August 24, 2008, 01:27:09 AM »
I am not to crazy about boring to 0.60 but hee its your money and your engine
X2 Why bore that large?  Its not a 350!  Go as small as you can and leave room for future CHIT!!!

Mr_Random

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Re: Engine rebuild time, some questions!
« Reply #14 on: August 24, 2008, 03:29:35 AM »
X2 Why bore that large?  Its not a 350!  Go as small as you can and leave room for future CHIT!!!
3

haha, I hope you realize he meant .060, not 0.60!! In any case, it's not gonna happen...