Question about Cars & Trucks

2 Answers

What may the reason of having oil in the cooling system cylinder head done checked and preassure tested on C240 2002 in

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Cars & Trucks Master
  • 1,250 Answers

It may be there because there system wasn't flushed completely upon doing the cylinder head work OR there may still be head problems. Return it to where the work was done.

Posted on May 06, 2017

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 281 Answers

Oil in the cooling system can only mean one of 2 things, you have a blown head gasket or your head is cracked.

Posted on May 06, 2017


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Why is my 2001 toyota sienna overheating?

Have a compression test done on each cylinder. Possibly a blown headgasket or cracked head

Oct 27, 2016 | 2001 Toyota Sienna

1 Answer

Still smoke water exiting exhaust.did gaskets on both rocket covers new oiln&filter

From what you have described you have radiator coolant leaking into the engine cylinders.

This will not be rectified by changing the gaskets on the rocker covers. That just stops engine oil leaking out from around the edges of the rocker covers.

The coolant will be leaking internally due to a failed cylinder head gasket and/or a crack in the cylinder head(s) and/or even a crack in the engine block. You will most likely also have combustion gasses leaking into the cooling system passages from one or more cylinders. I expect there will also be some coolant finding its way into the engine oil.

If you have allowed the radiator coolant to run low and hence for the engine to overheat at any stage that will cause the problems you have now.

You need to have tests run to check if you have a failed head gasket(s) and in that event the cylinder heads will need to be removed, the head gaskets replaced and, while removed, the heads checked for cracks, checked for any warping and overall condition. The engine block will also need to be checked.
If you run a compression test on all cylinders you will likely see the compression lower than spec in a number of them. A leak down test on each cylinder will show which cylinders have coolant leaking into them(and combustion gasses leaking out into the cooling system) and certainly confirm the need to remove the cylinder heads.

If you start the engine cold with the radiator cap removed, once the coolant has warmed and begins flowing from the engine via the top radiator hose to the radiator you will see bubbles in the coolant if there are combustion gasses leaking into the cooling system as described. This is an indication, (because the bubbles can also be air not properly bled out of the cooling system) but you still need to run a leak down test.

You need to have the problem checked out immediately as you do not want to be running the engine in this condition. Make sure you also check the level of the coolant in the cooling system and top it up when the engine is cool if not full. Coolant can escape quickly under normal cooling system pressure when the engine is running.

Apr 17, 2016 | Cars & Trucks

1 Answer

How do I check for a blown head gasket on my 1990

Pretty much same answer as I gave for 87 Reliant see below. Shops have equipment to do cylinder leakage test. Do basic stuff below before doing last test ...cylinder leakage...which costs $$$.

Main point you are losing antifreeze/water. Check to see if you have water on the dipstick mixed in with oil. If so...probably a head gasket. If oil looks normal..... Before you do any test, tighten every hose connection. Check for loose connection into antifreeze reservoir. Sometimes there are small cracks on top which lets out pressure from cooling system. Look for leaks on water pump and radiator. Look at spot where you park the car...any liquid on floor? Not sure?..Put piece of cardboard under car to see if liquid is dripping from car. No leaks?...Start with a pressure test of the system. The pressure test is simply equipment that replace the radiator cap, a hand pump connected to it then air is pumped into cooling system. You watch the gauge to see if pressure is dropping. If pressure does not drop ..problem is most like a worn radiator pressure cap or stuck thermostat.. Do not buy the kind with button on cap to push down and release pressure. get original type and correct pressure. If overheating still, thermostat could be stuck, replace. Overheating of engine causes vapor lock, bubbles in fuel, which causes car to stall and kill. When cools off, fuel cools down and fuel will flow through fuel system again. Large amount of oil disappearing with overheating also sounds like head gasket or cracked head....Tighten up all bolts to gaskets, look for oil leaks on garage floor or driveway. If engine has developed a miss when running, pull plugs out and look for wet fouled plug. If antifreeze leaking into cylinder...plug tip will be whitish, if oil leaking into cylinder, grimey oil fouled. Do compression test on cylinder that is fouled and that will pinpoint if bad head gasket or cracked head. When doing compression test, radiator cap is removed and you listen to hear bubbles in radiator from the cylinder leaking into cooling system. 87 Reliant not worth pulling engine apart if head gasket or cracked head. Best oil treatment to reduce oil consumption is "Engine Restore" Used on my 58 Impala 348 tri power for 28 years. If I did not add it after oil changes it used oil and smoked....I swear by it for ANY engine after 100,000 miles.

Oct 19, 2014 | Cars & Trucks

2 Answers

Just purchased a 96 volvo 850 took it for an oil change. after the oil change the car overheated and thought it was the reservoir cap. but the pressure is just to much and even the new cap leaks wat

Look for a leak in the cooling system. If your radiator or cylinder head seem to be compromised, or if you open the coolant reservoir and the levels are topped up, you may have a leak in the cooling system. If you're experienced with cars, check the radiator, core plugs in the engine block, or cylinder head near the head gasket for any signs of leakage.
  • If you don't know your way around cars, consider bringing your car to the nearest mechanic and ask them to pressure-test the cooling system. Pressure-testing the cooling system is relatively easy to do; you may even get it free of charge.

Apr 09, 2014 | 1996 Volvo 850

2 Answers

Chevy lumina overheat

engines overheat with no thermostats. Very simply put the water circulation is too fast for the heat to transfer to the air. Water pumps fail from bad bearings and pump seal but for no other reason. So back to basics Refit with a new thermostat put in properly. Have a flow test done on the radiator for blocked cores. have a coolant system pressure test done for leaks and cap failure.. have a compression test done to check for head gasket or cracks.. Check for correct ignition timing and air/ fuel ratio mixture. Run fault codes . when refilling with coolant ensure that all air locks are removed

Dec 29, 2013 | Cars & Trucks

1 Answer


Doesn't sound like it ran hot enough or long enough to crack or warp the head. If there is a crack, the engine will continue to overheat. If a warped head, car would probably run rough, the affected cylinders would likely have little or no compression, there would be a noticeable miss, and overheating would continue.
Why the low coolant? It's a sealed system, so should never have to add coolant, other than a small loss from evaporation in the overflow tank. Monitor the level closely for the next few days. Note the level in the overflow tank to see if it drops over time. Leaks can be external anywhere in the coolant system-engine, radiator, hoses, heater core- or internal in the engine-head gasket failures can cause coolant in the cylinders (white smoke out the exhaust), or coolant in the oil (oil will have a milky brown look to it), or oil in the coolant (will see traces of oil in the radiator).
A couple of tests may be called for. A pressure test of the coolant system will check if the system holds pressure as it should-about 15 psi. If pressure does not hold, there is a leak somewhere. Water pumps usually leak through the weep hole when they fail. A radiator leak would show up when pressure is applied. If pressure does hold, check if you have a good radiator cap-the cap is what seals the system so pressure will maintain. Coolant under pressure raises it's boiling point by about 10 degrees, so is critical to keep the system under pressure.
If you suspect further problems-losing coolant or continued overheating-then have the chemical test done to check for exhaust gasses in the coolant. Basically a check if the head gasket is good, a simple test done at the radiator cap opening with a special fluid that changes color if hydrocarbons are present in the cooling system.
Or you could have a compression test of the cylinders to check the internal mechanical condition-not only tells you if head gasket is good, also tells you a lot about engine condition-even,. balanced, good compression in all cylinders translates into good power output-rings are good, valves are sealing good, all systems go.
The cooling system: water pump, thermostat, radiator, hoses, heater core and hoses, radiator cap, overflow tank, and the cooling fans and associated wiring. Make sure everything is working right and you'll be good to go.

Sep 17, 2013 | 1994 Toyota Camry

1 Answer


You can do a compression test on each cylinder, if one or two cylinders are lower than the others, that could be a sign of a blown head gasket. Also, do a pressure test on the cooling system to see if the cooling system holds pressure. Check your oil for anti-freeze, and vise-versa. Any white foam around the oil cap? Or oil around the radiator cap?

May 08, 2010 | 1997 Mitsubishi Eclipse

1 Answer

91 mercedes benz blowing white smoke just changed cooling system

It's possible that engine coolant is making it's way into the cylinders (in other words a blown head gasket). I had a Pontiac that blew a head gasket, it was blowing white clouds out the tailpipe. It's a pretty involved job to repair but it is doable by a backyard mechanic. You'll want to check for oil in the coolant and coolant in the crankcase oil. Also do a compression & leakdown test on the cylinders.

When you say you just changed the cooling system what exactly was done and why? Was the coolant flushed and were you getting any symptoms of a problem (such as the engine overheating, etc.)?

Dec 12, 2008 | 1993 Mercedes-Benz 190

3 Answers

Blowen head gasket

If you had a blown head gasket, you would have HUGE amounts of white clouds of smoke coming out of the tailpipe. Your engine would be overheating/temp gauge reading high. Since you have not described either of these two things, I would hesitate to pronounce your veh with a head gasket problem.
Now, the bubbling that you speak of: MR2s are notorious for "air pockets" in the cooling system, as the engine & the radiator have a significent distance from each other. This can cause the bubbling sound. Knowing this, Toyota had the wherewithall to provide a cooling system air bleed proceedure when it was built. Open the front hood, and remove the spare tire. You should see a plastic tube coiled against the firewall. This ius for bleeding the air from the cooling pipes under the car. If you do not have the owner's manual that describes the coolant bleed proceedure, I will e-mail you a copy.
I would look at this long before I ripped the head off for no reason.

Oct 18, 2008 | 1991 Toyota MR2

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

29 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

79851 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

14331 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides