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How to replace a cracked subframe (pics included)

 
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Old 10-30-2011, 02:16 AM
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How to replace a cracked subframe (pics included)

So it is now my turn to return to the community my current experience with my subframe replacement and how ive done it thus far, that way should any poor soul have this same travesty fall upon them, they will have a rough guide to go by.

I apologize for some of the picture quality, my phone doesnt have a camera light but they should be clear enough to make out whatever im pointing out.

And ill admit, this is backyard jdm repair im doing cause im short on resources, but my methods are correct to my knowledge.

So, first things first, if youve never done this, deep breath! This kind of repair sounds alot harder than it actually is, its just time consuming (especially if you dont have a complete tool set like I do...), and a little meticulous at times.

First, jack the car up.






Next, remove the wheels.





First, I disconnected the lower control arm where it connected to the subframe. The bolt wasnt hard for me, theres more oil on the underside of my car than in it, so lube wasnt an issue.





Next, disconnect the sway bar and tie rod ends where they connect at the knuckle/hub assembly.






Now, disconnect the steering column shaft from the input spline of the steering box. Where the 10mm bolt was is kinda hard to see, but its the little hole of light in the center of a lock washer. You may have to turn the steering wheel around a bit until you see it.








NOTE: THIS NEXT STEP IS FOR 4WS PRELUDES ONLY, IF YOU DO NOT HAVE 4WS THEN SKIP THIS STEP!


Disconnect the steering box from the spline. Its essentially the same thing you just did up top, turn the steering wheel until you can see a 10mm bolt holding/ clamping a u-joint type thing down onto the steering shafts' spline.

(Resumed on next post, ran out of room.)
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Old 10-30-2011, 02:28 AM
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Re: How to replace a cracked subframe (pics included)

(Cont'd from post 1)




Now, your gonna have to take out the center beam that connects the subframe to the front core support. Pretty straightforward, just 6 14mm (I believe) bolts. I forgot to take pics of what it looks like already installed, but heres a pic of roughly what it looks like. Its the beam on the left. The small shield on the right is kind of a skid plate/protector for the steering box, youll have to take that off at some point anyway.








Now remove your exhaust drop-down pipe (where the pipe goes up to connect to the bottom of the exhaust manifold, DONT break any studs, or youll have a massive exhaust leak, or alot of fun trying to get the manifold off to try and fix it... trust me.), you can unbolt it at the bottom of the manifold and front of the catalytic converter, but I had to take my whole exhaust off cause the nuts holding it to the cat are stripped



(I know, it doesnt show the drop down pipe, but you get the general idea im sure...)


Next, you have do disconnect the transmission mount from the underside. To be on the safe side, ive put a small jack under the tranny to support it so it as well as the motor doesnt sag and possibly throw everything off. I do not have any pictures at this time, but its the 3 17mm bolts that hold a curving plate to the side of the transmission that goes up and connects to a mount on the topside of the subframe. Pics will be up asap.





Now this final step is as far as I am currently, and will be resuming this write up as i further progress, but your going to have to disconnect all of the lines going into the steering box, yes you will lose fluid.

disconnect all of the main ones going into the box:



as well as this one:





you are gonna want to make sure all of the lines' plastic securing snap lock thingies are all released so the lines wont hang to the subframe when you try to lower it, it looks a little confusing at first but once you disconnect them youll see that everything can be done from the bottomside.

well thats it for now, ill have part 2 up as I go on, and may re-write this with better pics.

Last edited by Bwelch1592; 10-30-2011 at 02:53 AM.
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Old 10-30-2011, 11:00 AM
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Re: How to replace a cracked subframe (pics included)

Nice half ass write up.
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Old 10-30-2011, 12:59 PM
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Re: How to replace a cracked subframe (pics included)

What camera were you using, a Motorola RAZR? lol.
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Old 10-30-2011, 04:45 PM
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Re: How to replace a cracked subframe (pics included)

haha Ogs would be offended
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Old 10-31-2011, 08:57 PM
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Re: How to replace a cracked subframe (pics included)

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Originally Posted by Phantom240 View Post
What camera were you using, a Motorola RAZR? lol.

HTC Aria, 6meg i beleive, cameras really dirty though, and its really sensitive to movement.

plus its a POS phone anyways so why bother explain that...


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Originally Posted by blaclabel1911 View Post
Nice half ass write up.
its my first one on ANY forum for that matter.

i figured it would be good to contribute once in a while.

im going to rewrite it cause ive come across a few problems that need to be stated, and get better pictures of course.

excellent display of support....
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Old 11-01-2011, 01:59 AM
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Re: How to replace a cracked subframe (pics included)

Best to do the job and post pics that you took during the process once its finished
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Old 11-01-2011, 10:13 AM
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Re: How to replace a cracked subframe (pics included)

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Originally Posted by Bwelch1592 View Post
excellent display of support....

lol, love the sarcasm!
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Old 11-02-2011, 07:19 PM
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Re: How to replace a cracked subframe (pics included)

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Originally Posted by Jared View Post
lol, love the sarcasm!
plust its kinda hard cause im using a half ass broken camera, half ass set of tools, and im doing it my back yard...

the result is a fairly half assed, yet honest attempt at sharing knowledge to the community.

what more can you expect from someone only using the severely limited funds and resources that i have? (or dont in this matter).

anyway the write up will be delayed, getting my steering rack off the 4ws steering shaft spline is proving to be a bit harder than i expected. might have to take it off seperately from the subframe to have enough wiggle room to get it off... not sure yet.

out of free time though, gotta do a 10 day straight at work

i miss driving my car
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Old 11-02-2011, 11:24 PM
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Re: How to replace a cracked subframe (pics included)

Quote:
Originally Posted by Bwelch1592 View Post
plust its kinda hard cause im using a half ass broken camera, half ass set of tools, and im doing it my back yard...

the result is a fairly half assed, yet honest attempt at sharing knowledge to the community.

what more can you expect from someone only using the severely limited funds and resources that i have? (or dont in this matter)


very well said, i completly agree
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In 1987, Road & Track published a test summary that shows the 1988 Honda Prelude 2.0Si 4WS outperforming every car of that year on the Slalom, including all Lamborghinis, Ferraris, and Porsches. It went through the slalom at 65.5 mph (105.4 km/h), an amazing result for the time. For reference, the 1988 Corvette took the same course at 64.9 mph (104.4 km/h).
http://en.wikipedia.org/wiki/Honda_Prelude
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