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-   -   Rebuilding the Engine... where do I start? (http://www.wranglerforum.com/f218/rebuilding-the-engine-where-do-i-start-144806.html)

Jarrodbeckstead 03-07-2012 01:36 PM

Rebuilding the Engine... where do I start?
 
I've broken down the engine, de-greased the block and cleaned all the other parts, re-ringed my pistons and now I'm ready to reassemble the motor but I was hoping someone out there would be nice enough to throw me a play by play of what to do. Working on a 1992 2.5L if anyone can help...

Redrider94 03-07-2012 04:19 PM

Get a manual you will need it to get the torque specs. Any auto parts will have them. You will also need an engine stand or some way to hold the block and turn while you reassemble it.

Nubby55 03-07-2012 04:34 PM

Check for a ring grove in top top of the cylinder, if there is one the block may need a re-bore, some folks shade tree it and use a ridge reamer to trim it out and then hone a cross pattern in the cylinders so the rings will seat. good luck if you do it that way.

ninfivfo 03-07-2012 04:41 PM

+1 On what is said above if your going to go through all the trouble to rebuild the engine dont do it half arse, do it right. Check the block out and see what condition it is in then start the rebuild as the block can change your plans. For a decent engine stand the harbor freight ones are not to bad the 2ton one is a beast and well worth the money.

Garyk 03-07-2012 06:33 PM

You have a lot to do. First each cylinder must be measured and honed, ridges reamed...rings must be gapped if the cylinders are OK, rod and main bearing surfaces must be measured and inspected etc. If you don't have a shop manual, suggest you get one...there are a lot of steps in rebuilding an engine the right way...

95YamJam 03-07-2012 10:05 PM

A lot of people have and will continue to do re ring jobs and really it's kind of a waste of time. As said above you need to check your piston to bore clearences, also check/replace main and rod bearings with the proper clearence. Many other things as well.

IMHO tear it all apart, take the block, crank, rods and pistons to an engine shop to have them checked for cracks and other problems. They will also clean it all very well and will most likley tell you what if anything needs done to the parts you take to them.

Jarrodbeckstead 03-08-2012 05:01 AM

I got the bugger torn down and cleaned, I was planning on ridge reaming the lip on the cylinders. What I was really looking for in this thread is what order to reinstall the parts. I know the cylinders have to be reamed first, pistons re-ringed and installed and then the rod and main bearings installed, followed by the crank but after that the sequence is a bit iffy. I have the manual which tells me how everything is done except the order. You guys have been great but a somewhat detailed walkthrough would be awesome help. Thanks all,
Another inexperienced garage mechanic

Xpress 03-08-2012 01:28 PM

Get a shop manual.

Rarely can you just toss in some new rings and throw it all back together. AT MINIMUM the cylinders will need to be honed out. You also need to check ALL bearing clearances (crank, cam, connecting rod, etc) to ensure that everything is within specs. If something is out of spec, and you throw it all back together you are very likely going to wind up with an engine that will destroy itself in no time at all.

Don't forget that you need to have your head checked for straightness, as well as have all of the valves re-done or replaced if need be.

Rebuilding an engine isn't as easy as it might seem... Having the proper tools is important. Namely micrometers AND a shop manual...

Nubby55 03-08-2012 02:44 PM

If I weer to put an engine back together, I would start with the Crank Shaft first, then the Cam, Gears and chain in time, then start putting the rod and pistons in, then the head, then the lifters and push rods, then all the rockers, then the Dizzy, then all the covers, manifolds.

As you put it together every time you install a part roll it thru 360deg. to make sure it's OK then go to next rod and piston ect..

Ibuildembig 03-08-2012 02:48 PM

Id take it to a machine shop and have them make it right before you waste time and money....my 02 cents

IAM747 03-08-2012 07:31 PM

I see a lot of comments about purchasing a shop manual all over this site. I purchased access to ALLDATADIY.com for my specific jeep. It has all your torque specs and some detailed diagrams for disassembling and reassembling. Just thought since you need some step by steps it might be a good place for you to start. But if your interested in rebuilding the engine yourself nothing wrong with that. Maybe you could find a local automotive machine shope you can bring your head and block along with your crankshaft and let the check the specs and make sure it is even a good Idea to re ring it. Before I could begin to tell you anything I'd have to know that you did everything taking it apart correctly as well. You need to make sure you have all your connecting rods and pistons marked for the same hole and etc.. See if you can find some local help would be much better off try the online access for some torque specs and diagrams.

Nubby55 03-09-2012 09:17 PM

Oh and if you need to cut the ridge out of the bore then it needs to be rebored, just saying what I think, but then again I was a Machinist for 34 yrs, not a Auto Mech..

IAM747 03-14-2012 10:42 PM

Couldn't agree more:)


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