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theowendorff
Samba Member
Joined: August 16, 2010
Posts: 12
Location: Cayucos, CA
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 Posted: Sat Jan 24, 2015 11:14 am Post subject: 1979 Bay Window Oil Leak |
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Checking under the bus, Oil is leaking out of the heat exchanger, causing the oil to burn up, and smoke come out of the heat vent. Should there even be oil in the heat exchanger? Can this unit be removed? Would it be wise to plug up the hole?
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SGKent 
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Joined: October 30, 2007
Posts: 42889
Location: at the beach
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| Posted: Sat Jan 24, 2015 11:19 am Post subject: |
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usually oil in a heat exchanger comes from one of several locations
1. dripping down from one of the pushrod tubes
2. dripping down from a rocker cover
3. being slung by the fan hub seal
4. dripping down from the oil cooler
5. dripping down from the oil sender - either a crack in the unit or a crack in the case near where it threads in because someone put too large a threaded sender or pipe in there.
6. distributor o-ring leaking and the oil dripping down.
Someone will probably remember other ways. You can use a special dye and black light to see where it is coming from first.
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George Carlin:
"Most people don't know what they're doing, and a lot of them are really good at it."
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"never time to do it right but always time to do it twice"  |
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Wasted youth
Samba Member
Joined: July 06, 2012
Posts: 5175
Location: California's Hot and Smoggy Central Valley
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| Posted: Sat Jan 24, 2015 12:48 pm Post subject: |
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Not sure why these have the little notch. Thought about plugging mine up, too, but figured it is there for a reason... Still mystified though.
Had same oil drip/burn problem. Pushrod tube O rings were old. |
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aerosurfer
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Joined: March 25, 2012
Posts: 1603
Location: Indianapolis, IN
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| Posted: Sun Jan 25, 2015 5:34 am Post subject: |
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thats a drain for when oil/water gets into the heat exchanger. Figure out where it is coming from. Like Steve said above trace the leak
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Rebuild your own FI Harness..My Harness
77 Westy 2.0L Rockin and Rolling Resto!
72 Sportsmobile (sold)
79 Tran$porter... Parts car money machine (gone) |
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my59
Samba Member
Joined: August 13, 2003
Posts: 4000
Location: connecting the dots
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| Posted: Sun Jan 25, 2015 5:56 am Post subject: |
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Chock the wheels, start the bus and lay down and look at the valve covers. Leaks there are easy to see. Unscrew the two metal parts between the bottom of the engine and the heads to expose the pushrod tubes. Leaks here are easy to see. Take your time.
The other leaks are harder to find but in any case cleaning everything first then running engine may make leak visible to naked eye.
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my59: Well son, my grandfather died before I got to drive it, so does that answer your question?
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Other:'12 Jetta, '77 Benz 300D, and a 74 MG Midget. |
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aerosurfer
Samba Member
Joined: March 25, 2012
Posts: 1603
Location: Indianapolis, IN
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| Posted: Sun Jan 25, 2015 6:47 am Post subject: |
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| SGKent wrote: |
usually oil in a heat exchanger comes from one of several locations
1. dripping down from one of the pushrod tubes
2. dripping down from a rocker cover
3. being slung by the fan hub seal
4. dripping down from the oil cooler
5. dripping down from the oil sender - either a crack in the unit or a crack in the case near where it threads in because someone put too large a threaded sender or pipe in there.
6. distributor o-ring leaking and the oil dripping down.
Someone will probably remember other ways. You can use a special dye and black light to see where it is coming from first. |
Let me add 4A. Oil cooler seals, same procedure to fix as oil cooler but a $1 part
_________________
Rebuild your own FI Harness..My Harness
77 Westy 2.0L Rockin and Rolling Resto!
72 Sportsmobile (sold)
79 Tran$porter... Parts car money machine (gone) |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 52638
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| Posted: Sun Jan 25, 2015 10:57 am Post subject: |
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Clean everything well and try to identify the source. If and when you decide to start just replacing parts willy nilly start with the easiest to access and save the harder ones for last. The easiest to hardest are ~
Missing bolt for thermostat cable guide wheel
Oil pressure switch
Distributor O-ring
Valve Cover Gaskets
Pushrod Tube O-rings
Fan hub seal
Oil Cooler O-rings, Oil Cooler |
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