What Causes Coolant In The Oil? Antifreeze In The Oil. Coolant In The Engine Crankcase? 

Good to see you back on youtube bud, its been a while. Hope the family is well and to see more of your vids coming out soon. Stay safe and always cool!!!!!!!!!!!

My buddy had the same problem, coolant in the crankcase. His was in a late nineties marine 3116. We checked all the usual suspects and the unusual as well. Wasn't looking good for avoiding removal from the boat and tearing it apart. Long story short, turns out in its past it had been rebuilt and sleeved. I believe the original block had cracked and was sleeved as a repair. Went for a hundreds of hours and about 10 years but eventually the sleeve cracked as well. Engine started and ran fine with just the slightest amount of white smoke that went away fairly quickly after the engine warmed up. It was low on the sleeve so the engine never hydro locked but after sitting for a while, as boats do, the coolant was low and there was red cat coolant in the oil. Just another possibility on this specific engine.... Great videos!!!! I found them very informative and steered me in the right direction in this case.

I never thought about the transmission cooler. I've been trying to locate the source of a mixing problem for 3 years.... I think I found it now. Thanks a lot!!

The bottle test is great, you should do a tips and tricks video showing what diagnostic tools and methods you use daily. Thanks for the video.

Congratulations on the baby. Wish you had gotten the head back on that C13 first, lol. I'll be looking forward to that video to make sure I got it right.

C15 Cat. If your getting antifreeze or water in your oil, it can be the water pump. Happened to me 2 times in 5 years

Thanks for the reply Josh. Merry Christmas

He cannot make it any clearer thank you for the knowledge

Thanks for the tips just bought my first car which is a 92 mustang and it was leaking coolant in the oil and a blown head gasket

Great video very informative keep up the good work sharing knowledge

Love your videos! Keep up the good work!

I'm an old school guy. shade tree mechanic, your new school knowledge is so helpful to me. and you do a very good vid. I appreciate very much your time and input, Thank you

Thanks a lot. I found the crack in linear in C18

I had an old Isuzu I4 with a crack between an exhaust valve and the coolant system. It was actually forcing coolant out of the system entirely at speeds above ~55-60, so driving around normally didn't really do anything, but going on long highway trips was problematic.

love your videos man keep it up👍

Absolutely very informative vid , thanks a lot

in the C7, alot of times it's oil cooler. Did ALOT of these for the Army and 9-10 times that was the case. Once in a great while was because of a warped head.....but that was rare

Thanks bruh. Everywhere I go they tell me "oh wrll just pay us 12 grand and we will rebuild yr Detroit". Thanks to you I'm beginning with the trans oil cooler and my oil leaking air compressor.

Thanks for another great video. It would be helpful if you would provide a link for the radiator test instrument.

That got super dark. Love it.

My truck was using 1/2 gallon of coolant everyday, couldn’t find the leak. Eventually I put pressure into the radiator and still couldn’t find my leak. Well the next morning my truck wouldn’t turn over it had locked up. Turned out to be inner cooler. With that added pressure for testing coolant it opened my leak more therefore leaking lots of coolant from the inner cooler into the cylinders overnight.

thanks for the tips hope we got more stay safe

Great work as always many thanks

Nice video real educational ud become a proffesor in the near future

dude, I've got a 86' 3204 with water in the oil. exactly 2 gallons. the machine was sitting through the winter, full of antifreeze in Georgia. it amazes me that i check the oil religiously, and all of a sudden, the dip stick registers 2 gallons high in oil and 2 gallons low on coolant. I am not a mechanic but, have a few mechanics leading me. I've taken the head off and pistons out and have pressurized the cooling system. I have found no leaks. other than the radiator. I've pressurized the system with ordinary water and have found rust around oil ports around the head gasket. I'm thinking this may be my problem. the head gasket but. have been told it could be the oil cooler or cracked block or head .

We had coolant in the oil on a 3306 in a Steiger Cougar 3. Turned out to be the water pump. The weep hole was plugged with rock hard dirt and did not leak externally until I cleaned out the weep hole,

Love your vids ..can I apply the same concept to my 855 Cummins?

Hello John. C 15 coolant is low. I find engine oil feeling cap coolant & same your video. I have question can the water in side engine from water pump ?

great video pitted cylinder liner

Well thanks to your videos. I found out I had a crack on my c13 head. I didn't ever over heat the truck up but I'm sure the previous owner did. Any how new head going on currently with all the components that go along with it.

Had a c15 Acert the was blowing white smoke and eating coolant like it was going out of style. No external leak, no coolant In the oil pan and it failed a pressure test. Turned out to be the pre cooler in the air intake system had failed and was spraying coolant into the intake side of the engine. Not cheap but better than a complete tear down.

hey josh, im getting oil in my coolant. no coolant in the oil. i have watched your videos on it. i have changed the oil cooler and getting the same thing. you also mentioned the air compressor. is there a way to test the air compressor? thanks

wow,, Great stuffff,, thank u,,,

Good video!!

I dynoed a used 3408. The more it ran the more steam came from the crank case vent. I added 2and 2 together coolant leaking into the oil pan. I removed the oil pan and thermostats. I put a piece of cardboard under the block. i then pressurized the cooling system. Drip drip towards the front of the engine on the cardboard. I used a mirror to check what cylinder was leaking it was number 1. The block had cavatation in the.o ring band. It could been fixed with balzona. The customer had it cut for an insert

What’s up adept ape, thanks for all your info. I have a acert c15 blowing white smoke and all the coolant going into my oil. My air compressor lines were frozen and it wasn’t getting charged. After I put air line anti freeze, later that day all the trouble started. Any help on what it might be? I’ve been told it’s probably a common thing, cracked head.

Like you videos nothing happened yet to my motor I have a 3406e caterpillar. I like your videos. I'm glad you on here these video.

Currently have this issue with CS11's C4.4 and CS533E's 3054 engines. Major headaches...

I'm getting oil inside my cooling. I have a 1999 3406E. I check the radiator cap is not a black stuff on there and look like it's a oil inside the cooling.

Massey Ferguson 255 I swapped the FI pump with a brand new one and the tractor is still not starting even though I used starting fluid on the air intake the tractor didnt even attempted to start. I also discovered when I took off the plate on the back of the chamber with the 4 bolts (I wish I could send you the picture I took) that there was an excessive amount of rust both on the plate and on the mounting part of the chamber where the pump connects/links with the three screws. The tractor just wont start and I have no idea what could have happened I thought just the FI pump would fix the problem but the issue seems to be bigger. Thank you!

great vid man. where are you located? id definitely bring my truck to you for repair

Need more info about blow by tube, that's what my truck is doing

Trevor my 3406 engine breads heavy after sitting for four years what should I do.

How about when there is coolant in the crankcase but no oil coming into the radiator? I've heard this could be caused by gavatation. When holes are formed in the front cover plate behind the water pump and coolant just runs into the oil. This happened on my 7.3. No sign what so ever oil coming back into the radiator. You can put coolant in the radiator and watch it flow out of the oil pan without it running.

I have a 300 cat engine in my Motorhome. I stored it over outside over winter. When I started it this spring my low water warning light came on. I added one and a half gallons of premixed coolant and was unable to get it to the full mark and it was disappearing as fast as I was putting it in. I cannot find any leaks anywhere. What do I do now? Help

I want to receive some information about engine manual.How to read it and from where I can get it?

This helped alot.

How to check the air compressor? My radiator is cool almost like water pump not working I took thermostat out only one on my 3406e 🐈 an still the same thing compression out expansion tank. Replaced oil cooler so I know it's not that.i really need some help

Josh, I'm getting oil in my fuel tank, fuel filters and 5 to 6 psi on my manifold, low power of course, C-15 525hp, would you please give me a hint what could be the issue. I thank you in advance for your response.

Thank you

Hello. I have a few questions that I hope you will answer ... I am using the C18 dongle with a problem with the machine's cooling water boiling and pouring out when the machine stops .. hope you help me. thanks

I have a 1997 International 4900 and within the last couple of drives, I noticed the reservoir for the coolant is turning black along with the low getting low, can recommendation? The truck rides fine, just noticed that the coolant is getting low.

my truck has little bit of smoke coming out if the crankcase tube under the truck, it's a Detroit has new liners and head gasket doesnt burn a bit of oil. and zero smoke from the exhaust.

I have a 2001 Cummins and I changed the oil cooler due to water in oil. Replaced the cooler and water drips into pan with engine off. Any ideas how to fix

will it be possible to have coolant in the engine oil due to a bad water pump on a Detroit diesel series 60 ?

Hi i have a question i have a 3126 and is drinking coolant im thinking its a head gasket..i put new oil cooler bacause blown and put oil in the system..so now i put new radiator all new and do couple flush so its good now i check when the truck its running and i put the truck like 15 rpm for 1 or 2 minutes the coolant go little by little if its in idle dont drink nothing...thanx and good videos

I just finished an MXS inframe today. The guy wanted me to save money. 20 mins after starting I had steam out of the blowby tube. Dropped pan and pressure tested. A solid stream from right timing cover at 15psi. Replaced water pump and leak stopped. No more saving money for these guys, the water pump should always be replaced while doing an inframe too. lol

I need help with my car 2005 Toyota Corolla I would like to why coolant is leaking into my oil pan , Help, Should I drive the car at all?

Sir can you help me Am uaing volvo penta D7A BTA DIESEL ENGINE Here saltwater mix with lub oil What is the reason.and how it will fix? Please reply

good video thanks. nice hat to.

What are specific tools you use to do a pm on a cat vehicle construction. Like pressure gauge and stuff like that and what brands are best?

Hello, the problem I’m having with my 1999 3406e cat engine is milky stuff only under the valve covers. Get to 1400 rpm’s starts shuttering stop engine light comes on, Oil pressure drops. Now start it cold oil pressure only gets up to 40 then starts dropping to 30 psi? Any advice on what might be causing this? Thank you

Hey I have a cat c12 and looks like it's leaking oil out of some lines under the radiator, but I don't have oil in the coolant system can the radiator be some sort of a oil cooler? No smoke out of the exhaust

I recently replaced my head gasket on my Perkins 1004-4 AA series in my JCB Robot 1997 due to coolant in oil and vice versa. I went ahead and replaced my coolant pump(gear driven), engine oil cooler, and thermostat since I already had top engine removed. Took my heads to machine shop for resurface and inspected for cracks, all good just needed new valves and got them replaced. Put everything back together according to the service manual and ran good for a couple of days though I did notice more than normal condensation on valve cover oil filler cap and coolant level going down slowly. Drained the oil and left it overnight with radiator full and oil drain plug removed. Checked in the morning and had coolant dripping from oil drain plug. I'm clueless to what my problem could be. Any help would be appreciated from anybody with similar experience. Thank you

Hi Josh, I'm working on a 3406c in a 980c wheel loader. The problem is that the coolant is coming up thru a head bolt hole. What would cause that?

Today I just had a c15 water pump leaking into the crankcase???????

Hi guys I have Ford 6610 I got the same problem but i don't have coolant in oil luckily just on blowby pipe and where tha valve area is any help would be thankful

I got my c13 loosing coolant but no coolant in oil or oil in coolant reservoir but yes a lot of pressure what can it be .

Watching the blow-by and suddenly realizing you have Chopin's Funeral March playing in the background made me laugh out loud. Hilarious.

Can you help me find someone to fix my truck I have coolant in oil but not smoking or riding ruff at all it really could be something like you said

hi Josh i have 6nz and the engine is running good. no symptoms no smoke but I've i did the bottle test and no bubles gotten some coolant in the oil and the little bit of oil in the coolant way to think ? can be piston sleeves o'rings freez plugs . base on your experience what do you thik that can be ? thank you .

Why does the water goes in the oil 7.3 idi

I had the same problem and I change the water pump and problem solved

C-10 cat, would a bad water pump cause bubbles in the bottle on the over flow tube? I'm getting bubbles at idle. I pressurised the system at 20psi an it didnt seem to move for 30min. Driver was running hot because of a leak in the coolant tube going to the compressor.

QUESTION Do you have to replace the head bolts when you do a head gasket?

Eeny meeny minny moe I wonder were my coolant will go: basically every used farm truck my dad has ever owned

Walmart parking lot,got me laughing. Nice one!!!

Any idea why coolant would be going directly into the crank case on a Cummins 4b? It happens after filling the coolant about half way and then will flow at about a 1/4" stream out of the oil drain pan plug. I recently changed the oil cooler housing because of a crack and pressure tested the cooler itself and it was fine. I've already removed the head and verified it's ok. Coolant begins flowing into the crank case before it reaches the head level. Input from anyone will be happily accepted😁.

hello sir, I would like to ask that there is water mixed in the oil pan. this is genset. what are the causes of this?tnx

What about some oil in the coolant reservoir?

Hey Adept Ape nice vid thanks for the info☺️ also we have a international harvester Simi from the 70s that has a cat engine in it I have no idea if the engine is original or not but I don't know what kind it is. I have looked everywhere but i can't find the number it's red too for some reason. My dad said the reason they stopped making then was because they couldn't sell any parts for then but I don't know if that true or not. Ps: we also have a Mack Simi and when it isn't under load it jerks the heck out of us we don't know why but I have a suspicion that it is the injector pump. I hope you can answer some of my questions -Bob

How in the hell did you pull the piston and liner at the same time??

You help me with gas car problem you are a million dollar dued

What causes oil in radiator antifreeze??

Josh, I got a c-15 that is getting opposite problem to this video, the oil is getting into the coolant tank and its a see thru tank that is all black from oil. I did change the oil cooler in 2012 and it fixed it then but now 300,000 km later, I have same problem just wondering do I change oil cooler again or is there something else I need to check ? Thanks and love the vids.

Hey Helo there it's a Toyota forklift it's not the head or the gasket I took it to a head shop but it diffintly gots water in the iol pan

Help , ASAP , We just rebuilt an ISX Cummins at the cost of $25000 (sleeves had to be shimmed) , 1 week after getting truck back the coolant is contaminating oil . The mechanic came to check truck and he said the problem is the OIL PUMP COOLER and that's not under his warranty . I am sure he is lying to us. he has us against the ropes . What is the best way to verify ?

My diesel truck has this problem 😕😭 good thing I don't have dogs or wife but I'm screwed big time

The best

Walmart parking lot!!! 😂🤣

Can the trans oil cooler be bypassed mine just took a shit

Adept Ape, will a CAT service center update or changed the "settings" of the ECM without the customer knowledge?

I am headed to a Walmart parking lot with my pistol, because my wife ran off with my fishing buddy. I miss him alot.

Hi men

Coolant goes good with coffee

Do you just work on truck engines or do you work on other cat engines like off road equipment?

LOL "my dog is gonna run away"

14l Detroit water pump will leak into your crank case.

Save time off of your life. 4:15 go strsight to the info.

Damn not in Wal mart