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Old 08-10-2015, 01:48 PM   #1
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Oil pan

How common is it for a c7 oil pan to rust? While having standard service the mechanic noted and recommend replacing oil pan because of rust.
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Old 08-10-2015, 02:00 PM   #2
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If this is just surface rust, there is now way I would replace it. Cleaning, sanding and repainting will make it like new. If you are on the lazy side, You can buy the coating that was made for oil rigs in the north sea. Spray that on rust and it converts the rust to a polimer and no more rusting.
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Old 08-10-2015, 02:23 PM   #3
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I had an oil pan rust through several years back. The problem started when the pan was smacked by a rock which removed the paint in a large area. It is not a part of the bus that gets looked at often and of course went undetected through many oil changes. Maybe the guys that did the oil changes saw the rusty spot and didn't bother to say anything.

Anyway I had a nearly complete loss of oil while parked in my driveway. Glad it happened there and not while driving.
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Old 08-10-2015, 02:33 PM   #4
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Not unusual for them to rust through, especially on the 3126 and C7.
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Old 08-10-2015, 02:33 PM   #5
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Quote:
Originally Posted by rfsod48 View Post
How common is it for a c7 oil pan to rust? While having standard service the mechanic noted and recommend replacing oil pan because of rust.
I've seen several posts on this here (or perhaps also in other forums). I was going to remove and repaint mine (10 yrs old), but it had several thin spots so I ended up having it replaced with a new one.
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Old 08-13-2015, 07:53 PM   #6
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How common is it for a c7 oil pan to rust? While having standard service the mechanic noted and recommend replacing oil pan because of rust.
rfsod48,
Don't get too excited about this. And don't get the wallet out just yet. Yes, some CAT engines, a few 3126 versions and, mostly the C-7s have had some rusting issues in and on, the oil pan. I don't know how handy you are but, that pan, hovers right around $400.00 and, the gasket uses the better part of about $40.00. Not to mention, the labor costs (if you don't do it yourself) to do the replacement. They'll more than likely book-charge you a minimum of $100 to $135 for an hours worth of labor, depending on what part of the country you're in.

So, you're looking at a close estimate of around close to $600.00 for an oil pan that most likely, DOES NOT NEED TO BE REPLACED!

Below are the pics of mine, when we first got it, four years ago. It's an '04 Itasca Horizon, 36GD with the C-7 330HP CAT. That coach, spent much of it's first adolescent years roaming around back east and you know what that means, that dumb-a$$ salt on those roads for winter driving.

Well, that took its toll on the oil pan. But, me being me, I checked into the prospects of a new one which, my local CAT dealer, HAD IN STOCK (imagine that) and the gasket too. Now, after a brief rest from an almost heart attack from being told the price, I decided to do some chipping away and seeing just how bad it really was.

Well, after about an hour of chipping, scraping, sanding with some seriously rough sand paper, I determined that pan was salvageable. Now, again, me being me, I had no CAT YELLOW so, I had some "Lemon" yellow hanging around so, guess what, my pan is LEMON YELLOW.

It's been like that for over four years and, 23,000, long hard miles. Not one leaking drop!!

But, this is mine. As for yours, only YOU will be able to say weather it will stand the test of time with a scrap/sand/wire brush/re-paint or not.
Scott





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Old 08-14-2015, 09:58 AM   #7
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I rubbed the rust off buffed the areas a bit and spayed with a yellow Rustoleum or similar paint a couple of years ago. It's about time to do it again - didn't last as long as I thought it would.
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Old 08-14-2015, 08:13 PM   #8
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rfsod48,

But, this is mine. As for yours, only YOU will be able to say weather it will stand the test of time with a scrap/sand/wire brush/re-paint or not.
Scott

I agree that the replacement cost is a heart stopper.

That next to last up close photo shows some deep rust though. I'm surprised you were able to salvage it.

Recently (like today) I was sanding some fan support arms that were nasty deep rustly. Coarse paper got the surface somewhat smooth, but the rust was still there in blotches. Then I used an ice pick to do some exploratory digging. When I was done, I had pock marked steel. The pits were easily 1/16" deep. Next was a good washing with naphtha. First coat of Rustoleum is drying now.

If I was doing a thinner metal, I'm afraid the rust pits would go all the way through.
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Old 08-15-2015, 10:03 PM   #9
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I agree that the replacement cost is a heart stopper.

That next to last up close photo shows some deep rust though. I'm surprised you were able to salvage it.

Recently (like today) I was sanding some fan support arms that were nasty deep rustly. Coarse paper got the surface somewhat smooth, but the rust was still there in blotches. Then I used an ice pick to do some exploratory digging. When I was done, I had pock marked steel. The pits were easily 1/16" deep. Next was a good washing with naphtha. First coat of Rustoleum is drying now.

If I was doing a thinner metal, I'm afraid the rust pits would go all the way through.
Moonrover,
I was fairly skeptical about the outcome when I took on that job too. But I figured what the heck, what have I got to loose if I try and salvage that pan? I mean, at worst, I'd have to shell out that money I stated earlier. So, I went to town on that pan. Apparently that pan is a bit thicker than I thought because unlike Jed Clampet (who sprung oil while shooting at some varmint trying to feed his family in the "Beverly Hillbillies") I did not spring any oil leaks. That's a good thing. So, a couple of coats of Krylon yellow and, it's still cruis'n down the road with no leaks.
Scott
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