Question about 1986 Volkswagen Jetta

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1986 jetta diesel with oil in the water. what are the possible reasons and then what is the most efficient way to diagnose the problem? thanks, Mark

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  • airlenny1 Jun 04, 2009

    I have a 1986 VW Jetta diesel that is non-turbo and does not have air-conditioning. I have found oil in the coolant resevoir and so there must be a leak that is pushing oil into the cooling system. What are the possible places for a leak like this to occur and what steps do I take to find the leak. I have extensive experience working on engines and repairing this car. I have most the tools a car mechanic would have and access to more if I need them.

    I have been running the car and noted that the cooling hoses started leaking and that the pressure in the cooling system is high. I have found oil sludge in the hoses and assume the radiator is clogged with this stuff and causing the leaks. I have also been checking the oil level and find that it drops half a quart over 500 miles. The engine runs perfectly and the car has not lost any power. The exaust is clean. There is no water in the oil.

    Is there a series of steps I can take to get to the source of the problem?

    Mark

  • airlenny1 Jun 04, 2009

    That makes sense. I will try the test. Never knew there was a head gasket test kit like this .

    Thanks for the info and I will "git her done"

    Mark

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Typically the oil in the coolant would be partial or whole head gasket failure. Head gaskets can fail one direction in that they can cause mixing of oil in water and not the reverse depending on where the gasket failure is.

I would recommend using a combustion leak detector such as

http://www.automotive-diagnostic-tools.com/Head-Gasket-Leak-Detector-Kit-p/lis75500.htm

quote from product page:

"Quickly pinpoints combustion leaks. Checks combustion leaks caused by bad head gaskets, cracked blocks and cracked or warped heads. Indicating fluid changes from blue to yellow when exposed to combustion gases in the radiator. Connect the hose to any vehicle vacuum line. Place tapered end of tool into radiator opening after draining of some coolant. With the engine running, the vehicle's vacuum draws vapors through the indicating fluid for testing Includes leak detector and testing fluid."

If you get a color change you can confirm your head gasket issue. This needs to be confirmed solidly before removing the head. Once you have the head off the car you can read the gasket and see where the leak was coming from. My guess is this is from a pressurized oil passage to a water jacket.

You can also use glowing dye in the oil and a black light to confirm the leak more. Either way if this is mixing oil in water only one way it will be a head gasket.

Posted on Jun 04, 2009

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Under most normal circumstances on any engine water in oil is a real problem, and can usually be traced to a leaky timing cover gasket, that is if the coolant is routed through there to the water pump.  Some 4 cyls have the pump attached directly to the block so if that is your case ignore the timing cover idea,  but I've had a leaky one once that leaked coolant.
Another one, obviously is the head gasket,
Hmmm... really there aren't too many places where coolant could get into your oil, unless you had a crack in the block somewhere that it doesn't affect your engine performance. because if the gasket is new (considering it was installed correctly) there should be no problem with that, and if your timing cover provides no coolant flow through to the pump, it really can't be too many things other than the head gasket or block.
water (condensed or not) should not be present in the oil at any stage. please get the oil changed and see....  but i seriously doubt the gasket... have it checked.....


Posted on Jun 04, 2009

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INTERFERENCE ENGINES WITH TIMING BELTS
ACURA
engine_interference.jpg
1986-89 1.6L Integra
1991-95 1.7L Integra
1990-95 1.8L Integra
1986-89 2.5L Legend
1992-94 2.5L Vigor
1986-89 2.7L Legend
1990 2.7L Legend
1991-95 3.0L NSX
1991-95 3.2L Legend
AUDI
1970-93 All Except 1970-77
1.9L & 1970-73 1.8L
BMW
1987-95 2.5L 325I 525I
1994-95 4.0L 740I
CHRYSLER
1993-95 1.5L Colt
1987-88 1.5L Colt
1992-95 1.5L Eagle Summit
1987-88 1.6L Colt
1989-92 1.6L Eagle Summit
1994-98 2.0L Neon Stratus
1990-95 2.0L Eagle Talon
DAIHATSU
1988-92 1.0L Charade
1988-92 1.3L Charade
1990-92 1.6L Rocky
FIAT
1974-79 1.3L 128 Series
1979-82 1.5L Stranda
1974-78 1.6L 124 Series
1974-78 1.8L 124 Series
1974-78 1.8L 131 Series, Brava
1979-82 2.0L Brava, Spider
FORD
1981-85 1.6L Escort, EXP
1981-83 1.6L LN7, Lynx
1984-85 2.0L Escort, Tempo
1993-95 2.0L Probe
1986-88 2.0L Ranger
1984-87 2.0L Lynx, Topaz Diesel
1985 2.2L Ranger
1989-92 2.2L Probe
1986-88 2.3L Ranger
1986-87 2.3L Diesel Ranger
1991-98 4.6L Crown Victoria
GM
1986-95 1.0L Geo Metro
1989-91 1.0L Firefly (CANADA)
1985-88 1.5L Sunburst (CANADA)
1985-89 1.5L Spectrum
1990-93 1.6L Prizm, Storm
1981-84 1.8L Diesel (CANADA)
1982-86 1.8L Buick Skyhawk
1990-98 1.9L Saturn
1987-88 2.0L Buick Skyhawk
1988-95 2.3L Quad Four
1985-87 3.0L Buick
1979-95 3.8L Buick
HONDA
1986-87 1.0L Prelude
1973-78 1.2L All
1973-78 1.3L All
1980-84 1.3L All
1973-78 1.5L All
1985-89 1.5L Civic
1988-95 1.5L Civic, CRX
1993-95 1.5L Civic Del Sol
1979-84 1.5L All
1985-87 1.5L CRX
1993-95 1.6L Civic Del Sol
1973-78 1.6L All
1980-82 1.6L All
1988-95 1.6L Civic, CRX
1984-87 1.8L Prelude, Accord
1979-83 1.8L All
1986-91 2.0L Prelude
1990-91 2.1L Prelude
1990-95 2.2L Prelude, Accord
1992-95 2.2L Prelude
1995 2.7L Accord
HYUNDAI
1984-95 1.5L Excel Scoupe
1995-98 1.5L Accent
1992-95 1.6L Elantra
1993-95 1.8L Elantra
1992-95 2.0L Sonata
1989-91 2.4L Sonata
1990-95 3.0L Sonata
INFINITI
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ISUZU
1987-89 1.5L I-Mark
1990-93 1.6L Stylus Impulse
1987-89 2.0L Impulse
1981-87 2.2L Diesel Truck
1986-95 2.3L Truck Trooper
1988-95 2.6L Truck Rodeo Amigo
1991-96 3.2L Trooper Rodeo Amigo
KIA
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MAZDA
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1988-92 2.2L 626 MX6
1989-93 2.2L Pickup
1988-95 3.0L 929 MPV
MITSUBISHI
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1990-92 1.6L Mirage
1989-95 2.0L Galant Eclipse
1983-86 2.3L Diesel Pickup
1994-95 2.4L Galant
NISSAN
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1983-88 1.6L Sentra Pulsar
1987-89 1.8L Pulsar
1982-89 2.0L Stanza 300ZX
1984-95 3.0L Maxima 300ZX Pathfinder
PORSCHE
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1976-89 2.5L 944 Series
1989 2.7L 944 Series
1989-91 3.0L 944 Series
1976-83 4.5L 928
1984 4.7L 928
1985-91 5.0L 928
1992-95 5.4L 928
SUZUKI
1985-94 1.3L Samurai Sidekick
1989-94 1.3L Swift
TOYOTA
1986-95 1.5L Tercel
1981-83 2.2L Pickup
1984-87 2.4L Pickup
1982-88 2.8L Celica Cressida
1987-94 3.0L 4-Runner
VOLKSWAGEN
1976-91 All Except 1.9 2.1L Engine
1990-92 1.6L Golf (CANADA) Jetta
1990-95 2.0L GTI Jetta GLI Passat
VOLVO
1991 2.3L Coupe 940
1986-94 2.3L 240 740 940

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