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Old 11-30-2009, 09:28 PM
Join Date: Dec 2006
Posts: 20
om606 engine

diesel fuel found in 3 injector compartments on top of engine. All return lines are dry. Could the heat shields on these injectors need to be replaced? 212000 mileage
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Old 11-30-2009, 09:41 PM
KarTek's Avatar
<- Ryuko of Kill La Kill
Join Date: Jun 2007
Location: Bahama/Eno Twp, NC
Posts: 3,249
Is it for sure diesel? The PCV system on this engine will break down and leak condensed crankcase oil onto the top of the valve cover and fill the injector wells starting from the rear most cylinder.
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Old 11-30-2009, 09:43 PM
Join Date: Dec 2006
Posts: 20
definite diesel fuel
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Old 11-30-2009, 09:51 PM
C Sean Watts's Avatar
Join Date: Mar 2006
Location: NC
Posts: 1,318
If you have a fuel leak it should not be coming from the heat shields.
1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!
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Old 11-30-2009, 11:54 PM
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Join Date: Jun 2006
Location: Mooresville, NC
Posts: 344
How closely did you examine the return lines?

When Rudolph was delivered, everything appeared to be in order. But after 2 days sitting in the driveway, 3 of the injector wells had filled with diesel to the point that it was running down the side of the engine and dripping on the ground.

The cloth covering on those injector return hoses can hide a multitude of sins. The ones on Rudolph appeared to be in good shape and dry - but once I squeezed them with my fingers, the cloth oozed diesel fuel, and you could feel that they were brittle and cracked where they attached to the injectors - a couple were completely broken off, only the cloth covering holding them in place.

If at 212K miles those hoses have never been replaced, they're long overdue. Even if they end up not being the cause of the fuel leakage, it's a cheap and easy replacement and will rule out one potential cause.
Just say "NO" to Ethanol - Drive Diesel

Mitchell Oates
Mooresville, NC
'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
Grumpy Old Diesel Owners Club
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Old 12-01-2009, 12:17 AM
sasquatchgeoff's Avatar
Cascade Foothill Lurker
Join Date: May 2007
Location: Portland, OR
Posts: 561
could also be cracked return barbs...getting out under the edge of the return hose. Have the injectors been recently removed?
327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron")
139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen")

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