In midst of engine swap, how to deal with engine bay / firewall rust? Pics included. - JeepForum.com
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Unread 04-16-2012, 01:32 PM   #1
Alheim
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In midst of engine swap, how to deal with engine bay / firewall rust? Pics included.

So the title says it all. I've got the motor out, I've got the engine bay cleaned, and I've got plenty of rust spots & bubbles, especially at the firewall where it is penetrated by bolts, screws, or hoses. Now's the time to take care of these, while I have easy access.

I was thinking of hitting all rust spots with a wirebrush in my drill, then using some sort of heavy-duty primer (epoxy?) to stop the rust. I'd like to avoid any topcoats. I don't care what it looks like, since it's underhood. What would you guys suggest?

Some pics below. Cheers!

The engine bay / firewall was covered in an oil slick before I cleaned it:



Typical rust:





One of the bolts that holds the fender to the grille. Not much rust yet, but I could see it getting worse. Anything to lube these bolts with during reassembly?



No motor!



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'95 YJ 123bhp 4-banger powerhouse.
UPDATE: 2.5L ENGINE RETIRED; she was still running strong at 212,000mi.
4.0 swap in progress.

Last edited by Alheim; 04-16-2012 at 01:34 PM.. Reason: Fixed images.
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Unread 04-16-2012, 01:36 PM   #2
timatoe
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Chassis Saver
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Unread 04-16-2012, 03:16 PM   #3
40dog
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Coat all bolts with never seize before re install . Chassis saver the rough rusty stuff but be care full with chassis saver on smooth metal it needs some thing to get a hold of and on smooth metal chassis saver will peel off in sheets . Rough it up good with 120-180 grit before applying to get a good tooth for it to attach to. I like chassis saver but it has its limits.
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Unread 04-16-2012, 03:55 PM   #4
Alheim
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Thanks. I'll consider Chassis Saver, but I'm still open to other suggestions. Think that wire-wheel prep is sufficient for Chassis Saver, or would you hit it with rough sandpaper as well?
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'95 YJ 123bhp 4-banger powerhouse.
UPDATE: 2.5L ENGINE RETIRED; she was still running strong at 212,000mi.
4.0 swap in progress.
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Unread 04-16-2012, 04:18 PM   #5
giggityjeeper
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if ya dont get the surface rust off it will just bubble more...... remove the bolts etc, either wire wheel or wrapper wheel on a grinder, and get to metal, prime it good, sand smooth and I woul dpaint the whole fire wall black or rhino line it or shassis saver it then, but it hs to be metal..... the rust will just rebubble under whatever you cover it with
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Started with some rust repairs ended in a SOA...

http://www.jeepforum.com/forum/f12/h...-jeep-1050879/

family roll bar swap/upgrade..

http://www.jeepforum.com/forum/f12/f...grade-1054753/

1990 YJ. SOA, OME 36R 3.5" lift springs, OME 5/8 greasable shackles, OTT high steer, Custom cage, team Rush, Posi, 33 TSL swampers
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Unread 04-16-2012, 04:25 PM   #6
40dog
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wire knot wheel works good .
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Unread 04-16-2012, 04:38 PM   #7
giggityjeeper
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Quote:
Originally Posted by 40dog View Post
wire knot wheel works good .
its VERY abbrasive tho, if he wants a smooth finish you would have to prime and resand lots with sandpaper or have sanding marks under the paint, if just using chassis saver this would work, as its thick and you wont see the marks
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Started with some rust repairs ended in a SOA...

http://www.jeepforum.com/forum/f12/h...-jeep-1050879/

family roll bar swap/upgrade..

http://www.jeepforum.com/forum/f12/f...grade-1054753/

1990 YJ. SOA, OME 36R 3.5" lift springs, OME 5/8 greasable shackles, OTT high steer, Custom cage, team Rush, Posi, 33 TSL swampers
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Unread 04-16-2012, 04:52 PM   #8
40dog
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nothing is one step .Wheel it then scuff with 180 then 2 coats high build primer scuff with red scotch brite or 320-400 grit shoot some paint on it.


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Unread 04-16-2012, 04:59 PM   #9
40dog
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frame covered with 2 coats chassis saver
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