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Operation 'Basket Case MJ'


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1 hour ago, Gojira94 said:

Still hunting for the grommet for the slave cylinder lines, but I'll proceed for now without it.

I pulled my internal slave bellhousing out and have a grommet you can have for the price of shipping. Message me if you would like it.

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20 hours ago, Eagle_SX4 said:

I pulled my internal slave bellhousing out and have a grommet you can have for the price of shipping. Message me if you would like it.

 

Heck yes! Thank you very much for the kind offer to help me out with this!

 

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Minor update- I switched out the shaft bearing in the fan/ compressor (now alternator) bracket. NSK 885586. It's longer than the one I pulled out, so I shortened the 'long' end to be the nose. The back side ends up just short enough to cover with a cap plug to keep dirt and water out at that end. I used Seymour Alumi Blast to brighten up and protect the bracket. Good stuff, I'll probably put it on the intake when I get done cleaning that as well.

 

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On 1/23/2025 at 1:59 PM, Gojira94 said:

One more- I decided to go ahead and ceramic coat the manifold. First 2 cures with a heat gun, 3rd with a torch.

 

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What did this process look like? How’d you get the ceramic on the header? I was always under the impression that the ceramic coating was similar to powder coating. I did do a similar curing process when I used header paint on my Eagle. 

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On 1/24/2025 at 9:11 PM, 89 MJ said:

What did this process look like? How’d you get the ceramic on the header? I was always under the impression that the ceramic coating was similar to powder coating. I did do a similar curing process when I used header paint on my Eagle. 

 

One of the kids that works for me at job #2 said he had some Cerakote and he'd shoot it for me. It's essentially high-end header paint. And yeah, heat to cure it is the key. Ideally, bake it in an old oven at 475-500* for about an hour. He did 2 light coats, after which i got it piping hot with a heat gun, followed by a medium coat. I let that cure for about 12 hours and then used a map gas torch for the final cure.

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To start clearing out some of the larger stored parts, I've been working on exhaust. Parts list is as follows. Since the engine and manifold are essentially 91-95 HO, I'm comparing lengths to a 91 MJ's stock parts as made by Walker. Any slip fitment is excluded from nominal measurements to be conservative in estimates.

 

Mine:                                                                                Stock 91 MJ:                                             Additional Length

Headpipe

Walker 55277 2.5" no crush, 38.25" length.                  Walker 44626 2.25" crush, 36" OAL     (2.25" longer)

 

Converter

Magnaflow 94006 2.5" 16" OAL                                    Walker 15634 2.25" 21.75" OAL             (5.75" shorter)

 

Muffler (big, deep, quiet)

Flowmaster 52571 70 Series 2.5" 28" OAL                    Walker 18403 2.25" 21" OAL                  (7.00" longer)

 

Tailpipe

Walker 46701 2.25" 70" OAL                                         (Same/ no comparison)                           (net 0.00")

                                                                                                                                                          ===========

                                                                                                                                                          min. 3.5" longer

 

The idea is to be able to keep it in 4 sections for ease of removal. 5 stainless band clamps, and several adapters to be welded to cat and muffler (with a very short spacer pipe between cat and muffler) are in play. This introduces additional approx. 8.5-9.0" net.  I can take an absolute max of 10.5" off the front of the tailpipe to accommodate the longer cat and muffler assembly. Looks like the tailpipe hangers can swing forward/ backward about 2" more or less. I need to mock and measure on vehicle before doing any trimming (already did it in my den lol). As I went out to the garage on my lunch break from job #1, I wondered aloud "I wonder what the first issue will be?" There were two...

 

First issue, I always thought the hanger angle on the headpipe didn't look right. Quick fitment check had it resting on the crossmember. I bent it about where I thought it ought to be and I like it now.

 

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Second issue is the front hanger for the tailpipe. Somebody had an 'oops' somewhere back in time. I have this soaked with PB Blaster so I can pull it off and fix it before I can continue the mock-up. It's frozen solid and now asymmetrical...

 

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Exhaust pics. Only had to shorten the tailpipe 7.25". None of the clamps are tight, it'll sit about 1 1/2" higher once tight. I'll be cannibalizing a heat shield for the cat from a full size late model Chevy/ GMC.

 

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1 hour ago, Eagle_SX4 said:

It appears that cat has a heat shield it is just upside down


Pretty sure that one’s meant to be bottom side (think pulling off the road on tall grass). I think It would be too small to be effective up top anyway. The original heat mat under the passenger side seat was like a soggy diaper when I pulled the interior out.

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I have aftermarket cats on both of my vehicles that look the same as yours. I did not add any extra heat shields to them. I installed mine with the included heat shield facing up and have not noticed my floors getting hot. More heat shields are good idea. 

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5 hours ago, Eagle_SX4 said:

I have aftermarket cats on both of my vehicles that look the same as yours. I did not add any extra heat shields to them. I installed mine with the included heat shield facing up and have not noticed my floors getting hot. More heat shields are good idea. 


Interesting. First of this type I’ve installed on anything I’ve built, so thanks for the findings. I’ve always used spun cats on my street builds, 300 cell/in. or 100 cell/in. and done heat shields above. The GM shields are 2 layer heavy foil with glass or ceramic fiber in between, and flexible mounting tabs. I trim to shape and re-crimp the edges. My local yard usually has an Xj or 2, so I should be able to browse, choose and test fit to find a good match to customize.

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Sunday was a day of "How many 5-15 minute tasks can I get done today?"

 

- Canister fresh air line

- Clutch hydraulic line

- Finish cleaning intake

- Fuel rail & FPR vacuum line

- Injectors

- DEI fuel rail heat shield kit

- Brake booster vacuum line

- Throttle body (still needs bored)

- MAP sensor

- Throttle and cruise cables retainer on VC

- PS pump

- Metered orifice and fresh air CCV tubes

- CAI (RC open box, < 1/2 price, for giggles)

- Exhaust final mounting

 

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A few more details attended to up top, and a pic of the clutch hose setup. Figured out where I'm going to mount the cruise servo. Attaching to an HO throttle body, unlike the Renix XJ it came out of, where all the cable attachment is way different.

 

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