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#1
05-19-2010, 02:11 AM
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1999 E300D - Blown Head Gasket or Cracked Head?
Vehicle was caught in downpour last weekend... while waiting at idle for light to change, a truck passed in front, tossing water on the grill. Engine stalled but could be restarted about an hour later.
Inspection of the air filter housing revealed a water-logged air filter and water in the top and bottom halves of the filter housing. A small quantity of water was also present in the air mass sensor and turbocharger air intake duct. Turbo vanes are intact. With everything dried out and engine cold, engine starts readily and runs well for approx. 3 minutes, after which a distinct miss develops, along with white exhaust smoke. CE illuminates, code indicates multiple misfires. Waiting now for inspection by the insurance adjuster but, in the interim, anyone care to hazard a guess - blown head gasket or cracked cylinder head? There is a faint trace of oil/water admixture (mousse) present now on the interior of the oil filler cap. 
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#2
05-19-2010, 05:17 AM
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Should be in the diesel section.
Some white mousse on the bottom of the oil cap is not entirely unusual on a undamaged car, more common in cold weather. I don't like those pop can heads, I would put my guess on the head itself. Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#3
05-19-2010, 11:05 PM
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hmm,well after the water got into the cylinders causing a hydro lock,im sure the remaining water was pushed down into the exhaust system,when fully heated up,it maybe vaporising causing the misleading vapor cloud,making you think its a blown head gasket,but its not uncommon to see whitish build up on the valve cover ,you may have hydro locked the cylinders,then the added boost from the turbo may have blown out a head gasket,my sugestion if you cannot solve it,remove the head,have it magnafluxed from your local machine shop to check for cracks,then have the head o-ring machined,then put in a high pressure o-ring copper head gasket,this should keep the head gasket from blowing out,maybe you got lucky and just need to run off the exxesive water.
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#4
05-20-2010, 12:54 AM
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Must've been a pretty good amount of water. Sorry to hear about this, man.
Your white smoke could be unburnt fuel from the misfire. Had it happen a few years ago, cold starting with a dead glowplug.. misfired until that cylinder was warm.
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99 E300 TD -- sold 01 540i 6 spd
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#6
05-20-2010, 05:12 AM
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I cast a jaundiced eye towards all diesels with aluminum heads. Given the circumstances i woulddn't doubt at all that it's cracked. Other post was right on, pull the head and have it checked for cracks.
Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#7
06-06-2010, 07:06 PM
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OK. Fuel injectors were removed... no fuel or motor oil was present in any of the injector wells prior to injector removal.
Injectors # 1-4 were unremarkable but the bottoms of injectors #5 and 6 and their corresponding heat shields were coated in motor oil. Awaiting cylinder compression test. Anyone familiar with the location of the coolant and oil passage ways at the rear of the OM606 head? What damage scenario would yield oil in cylinders 5 & 6? Are we dealing with both a cracked head and a blown gasket? Or could a head gasket compromised in 2 locations... i) cylinder-oil passage way and ii) cylinder-cylinder... account for this current finding? Last edited by jgl1; 06-06-2010 at 07:17 PM.
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