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Old 12-24-2011, 06:14 PM   #1
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Rusty dipstick??

My sister has a '95 YJ. She's had it about a year now. When she first got it I was changing the oil for her and I noticed the dipstick was rusty. I told her about it and we got a new one for it--new dipstick and new dipstick tube. Today she told me the new one is rusty now. Does anyone have an idea what might be causing this?

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Old 12-24-2011, 07:03 PM   #2
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There may be water in the engine or in the gas tank. Has it been off road where it could have sucked up any water?

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Old 12-24-2011, 07:15 PM   #3
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Originally Posted by CJ7GoldenEagle View Post
My sister has a '95 YJ. She's had it about a year now. When she first got it I was changing the oil for her and I noticed the dipstick was rusty. I told her about it and we got a new one for it--new dipstick and new dipstick tube. Today she told me the new one is rusty now. Does anyone have an idea what might be causing this?
Ask her if theres any offcolored fluid on the stick too.. ie something that doesn't look like regular oil?

sucking water up in the engine would (in enough quantity) hydrolock the engine and possibly damage it, which doesn't sound like the case..

check to make sure the dipstick tube is pressed into the block tightly, that the nut on the stud hasn't come loose and that the dipstick is sealing around the tube..
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Old 12-24-2011, 07:46 PM   #4
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Yeah.. Foamy light brown is not good. Any overheating issues? Rough running? If there's water in there and she hasn't been in any pools of standing water, we can help you narrow it down. Like Dark said.. if the tube isn't sealing.. rain water could be seeping in. Let's hope that's the case. And this is assuming she keeps up with her scheduled oil changes? Otherwise.. after a long time.. condensation can be a factor, as well.
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Old 12-24-2011, 10:39 PM   #5
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No, she hasn't been doing any off-roading with it, so there's no way it could have sucked up water that way. I don't know of any over heating, but I'll ask her about it. I'll check to see if it seems to be sealing correctly tomorrow.
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Old 12-24-2011, 10:41 PM   #6
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About the topic......Gigiddy lol
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Old 12-24-2011, 10:46 PM   #7
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Originally Posted by CJ7GoldenEagle
No, she hasn't been doing any off-roading with it, so there's no way it could have sucked up water that way. I don't know of any over heating, but I'll ask her about it. I'll check to see if it seems to be sealing correctly tomorrow.
Does she drive it on a regular basis and for longer drives? Or at least let it get to operating temperature often..
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Old 12-24-2011, 11:16 PM   #8
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as i was reading thats what i was thinking, not getting it hot for a long time can cause condensation in the engine.
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Old 12-24-2011, 11:49 PM   #9
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as i was reading thats what i was thinking, not getting it hot for a long time can cause condensation in the engine.
yup....my brothers dakota suffers from this, most vehicles don't get as hot as they need to until after 10 miles, and still need to be drivin past that to get rid of the moisture....we only live 9 miles from where my bro works, and 12 miles from where i work, my truck has no issues with it, his does
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Old 12-25-2011, 01:07 AM   #10
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About the topic......Gigiddy lol
You're trying way too hard. Tell us how you really feel.
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Old 12-25-2011, 12:48 PM   #11
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Okay, so she says she hasn't noticed any overheating problems. I looked at the dipstick and it seems to be pushed in all the way and the tube looks like it's in the block correctly. She was still driving it regularly around town in stop and go traffic when she noticed it was rusty again. It's been like 4 or 5 months since the last oil change, so maybe it's a little over-due. Here's a pic of the rusty dipstick. The rust is on the upper end of it. So maybe it is just condensation.
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Old 12-25-2011, 01:23 PM   #12
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I hate it when I get rust on my dipstick!
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Old 12-25-2011, 01:38 PM   #13
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Looks like condensation maybe she let the Jeep sit a little too long? Top of the dipstick probably doesnt always get warm enough to burn off the water
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Old 12-25-2011, 02:06 PM   #14
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I hate it when I get rust on my dipstick!
Gigiddy
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Old 12-25-2011, 02:47 PM   #15
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Looks like mine, I barely drive it and when I do it is not far enough to burn enough of the moisture out of the engine.

Lots of start and stop driving might get the engine up to temp. but it doesn't get all the moisture burned off and can actually create more depending on the humidity.
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Old 12-25-2011, 02:49 PM   #16
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Gigiddy
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Old 12-25-2011, 03:00 PM   #17
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yup, what they said, oil looks just fine i wouldnt worry about it to much
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Old 12-25-2011, 04:16 PM   #18
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Looks like condensation maybe she let the Jeep sit a little too long? Top of the dipstick probably doesnt always get warm enough to burn off the water
idk, mine sat in my grandmas backyard for 4 years until she passed away and my aunt sold it to me(aunt owned it but it needed repairs) and the dipstick on my jeep doesn't look like that.
The oil looks a lil dirty but i don't see any signs of water in it.....so who knows.
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Old 12-25-2011, 10:26 PM   #19
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i have noticed mine looks the same way especially since it got cold here in NC. I dont drive it every day. I did have coolant leaking a while back due to warped head. replaced that. no coolant leaking down and not running hot. changed the oil twice since the head was replaced. put some cheap oil in one time to top it off from autozone.
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Old 12-27-2011, 10:22 AM   #20
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Okay, I'm just going to go with the assumption that it's condensation. Thanks for all the help and advice everyone.
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Old 12-27-2011, 12:28 PM   #21
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When was the last time the PCV was changed?...
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Old 12-27-2011, 12:49 PM   #22
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whenever you check the oil, just wipe a little of the oil along the top of the stick before you put it back
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Old 12-27-2011, 01:33 PM   #23
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With a situation where no water is getting into the engine from leaking dipstick or oil filler cap. Driving through deep water is not needed to get water in the engine if the dipstick or oil filler cap has a poor seal. Just driving in a rain storm will put excessive water in the crankcase. Given these seals are good then the rust is caused by condensation. When you see condensation on the outside, there is a similar amount of condensation inside the engine. The engine oil has to get at or above the boiling point of the water to get rid of it.

Rust on the dipstick and or, condensation (white junk) on the oil filler cap, is a good indicator of this condensation not being eliminated properly.

There are two possible causes:
1) Short runs on a regular schedule, (less than 10 min at operating temperature) not driving long enough to fully warm up the engine.

2) (most likely) Thermostat is not keeping the coolant hot enough. Minimum coolant temp is 175 degrees F. If the temperature is not kept high enough the condensation will continue to collect causing these problems. A 185 degree F thermostat is minimum. Generally the dash gauge is not dependable to indicate the coolant is hot enough. At 175 F coolant, the engine oil will be about 200 F to 220 F. This hot oil is what is needed to cook out that moisture.
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Old 12-27-2011, 01:43 PM   #24
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she'll want to change oil every couple thousand miles if its all short trips. And yeah, run it to burn the water out. This is really common on the old cast iron harley engines as well. They need to be run for at least 30 minutes to clear the condinsation out of the oil.
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Old 12-27-2011, 01:47 PM   #25
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and someone mentioned the PCV valve. That is where the steam would go when the water gets burned out of the oil. (vents the crankcase) If that is clogged, the steam may be rising into the dipstick channel.
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Old 01-27-2012, 10:43 AM   #26
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Hmm, okay. That all makes sense. Thanks, I'll pass that along.
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Old 01-28-2012, 11:46 PM   #27
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Tips from the beas

It is just condensation build up. And yes...Gigiddy!

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