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#1
11-12-2005, 02:57 PM
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help! blowby thumb test and then OIL...
I hope I didn't just ruin my engine. (84 300SD engine) I was curious about the blowby of my engine and performed the "put the thumb on the breather hose" blowby test. Well, After about 6-7 seconds it stalled, I heard a pop, and then saw a spray of oil come from the vicinity of the oil filter housing.
 !What did I just destroy? Is there any likelyhood that this was just pressure pushing oil thru the top of the oil filter housing? Or did I just add something expensive to fix onto the list of repairs? Someone mentioned an oil seal by the IP on another thread, is this likely? And is it fixable by a DIYer? Please help. 
Last edited by origamitect; 11-12-2005 at 03:42 PM. 
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#2
11-12-2005, 03:44 PM
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bump
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#3
11-12-2005, 04:07 PM
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sounds like
you blew off a hose that ventilates the air cleaner or somehting like that. look areound and see if you can spot it.
tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
11-12-2005, 04:31 PM
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Well look at your IP, if it's not leaking it's probably fine. I would pull the oil filter and inspect it. Also check your breather hose and make sure it didn't pop off somewhere. Monitor your oil level for the next few days of driving and look out for oil leaks. If you don't see anything suspicious, I wouldn't worry about it. A better blowby test is to just loosen the oil filler cap when the engine is hot and watch it. Be careful that an oil drop doesn't land in your eye in case the cap flies off.
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2004 VW Jetta TDI (manual) Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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#5
11-12-2005, 04:40 PM
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Hmmm
Quote:
Best guess: You built up too much pressure in the crankcase, and popped the valve cover gasket or oil filter cover seal ring. Be very glad it was not the rear main seal.
__________________
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/
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#6
11-12-2005, 05:21 PM
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Shut off switch diaphragm? Although that should blow oil into a vacuum hose.
Exactly why I am reluctant to pressurize the crankcase.
__________________
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
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#7
11-12-2005, 05:32 PM
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I did that test about 3 times on my car, it stalls after about 7-8 seconds. Is that good? It didn't do any damage to mine when I did it.....My engine runs great though, so I'm not worried about anything. Idles smooth and quiet, and Spools/revs like no tomorrow when I floor it.
 Now that I fixed the vacuum system the tranny shifts nice and firm/quick, so I can keep on the pedal the whole time, made it all the faster/better! No more flaring or tranny slipping, all gone, its awesome.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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