1987 300td blowby - YouTube

FYI: This engine has coolant bubbles/pressure at idle and tests positive for combustion fumes in the coolant via the 'blue-liquid-turns-green-device' when put in place of the reserve tank cap. It took a minute or so but the liquid clearly turned from dark blue to green.
I have not seen any signs of oil in the coolant or coolant in the oil so I'm assuming a cracked head (it's a #14 that overheated after re-enabling the turbo by cleaning the turbo's clogged boost pressure line in conjunction with a failing water pump).

I'm curious what effect the cracked head has on the blowby. How does it look to you guys?

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1987 300TD, 200,000 miles - Nice upgrade from my old
Blue '80 300TD, which is still runnin like a champ on WVO - 450,000 miles.

Looks average.

I suggest you stop running - driving it, or you will junk the engine soon.

603 rebuilt cylinder heads - $500 (hayward / castro valley)
603 rebuilt cylinder heads



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ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Hunter, are you suggesting he stop driving it because of the blow-by, the combustion fumes in the coolant, or both? Just trying to learn. Thanks.

This type of damage is from coolant leaking into the combustion chamber.
Depending upon the leak location and cylinder topography/combustion wave form characteristics, pre-chamber, valve, piston and/or cylinder wall erosion - pitting can wreck the mentioned parts plus lead to broken rings.
http://www.peachparts.com/shopforum/diesel-discussion/325016-1980-240d-cracked-cylinder-head-cavitation-damage.html

This does not address the serious risk of sudden total head gasket failure, causing massive cylinder water ingestion = bent rods.


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__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Very minimal blowby.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

My OM603 with 14 head doesn't do that at all.

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CENSORED due to not family friendly words

If the head were cracked to a water jacket no increase or decrease of blowby would be expected to occur. Is your hose really stiff first thing in the morning?

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CENSORED due to not family friendly words