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#1
03-05-2008, 05:34 PM
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Valve Cover cracks
What causes the valve cover on the OM617.95x to crack between the oil fill hole and the crank case vent hole?
Can they be welded shut by an aluminum welder?
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K Last edited by rrgrassi; 03-06-2008 at 01:17 PM. 
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#2
03-05-2008, 05:43 PM
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Quote:
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#3
03-05-2008, 05:49 PM
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I can take a pic. If you look at the top of the valve cover, it's between the oil filler cap and the line that runs to the air cleaner. It is a single crack, looks like metal fatigue. It has been like that since I have owned the car. I was just wondering what causes it.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#4
03-05-2008, 05:50 PM
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China's valve cover has small hairline cracks also. It doesn't apparently go all the way through......
It's about like your's Ralph, but in a different place.
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Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#5
03-05-2008, 05:54 PM
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Jimmy, I remember you pointing that out when you helped with the UCA replacement. I got curious. When I see China again, please point them out.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#6
03-05-2008, 06:01 PM
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Very odd. Are the cracks visible inside as well?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#7
03-05-2008, 06:44 PM
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Mine warped
Several years ago the valve cover on my 83 300D had to be replaced by the indy doing a valve adjustment to control a leak that developed. He picked up one from the local bone yard.
If it could warp, it could crack. I wonder if either are caused by improper tightening sequence or contamination in the seal? Just a thought. Charles
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#8
03-05-2008, 07:08 PM
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I also have a cover with a crack in the same place. one is an inch long, and the other is 1/4 in long. both are from the vent tube and on the outside edge. the 1 in goes towards the rear and the 1/4 forward. they both start from the base of the tube.
can`t tell if the crack is on the inside since the vapor sheet metal piece is in the way. I bought this cover from pick n pull & didn`t see it with the dirt on it. I have been in the process of polishing it, It`s going to look good.  I have a welder I use, I`ll see if he can weld it. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#9
03-05-2008, 09:37 PM
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FWIW. The 617.951 I rebuilt in 2004 had an oozing crack from the oil fill hole to the breather hole - all the way. I flushed it with isopropyl and trike, then pried it open just enough to get some high strength epoxy in it. 30K and 4 years, not a drop of seepage yet.
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'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#10
03-05-2008, 09:42 PM
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I second the epoxy. I repaired a cast iron hot water radiator in my house with epoxy 19 years ago. It is still holding fine.
There are also products available to weld aluminum with a propane torch. I've made a number of aluminum saddles for my canoes with one of these products and the welds have never broken.
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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
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#11
03-05-2008, 09:42 PM
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Probably a combination of heat stress and overtorquing the nuts.
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#12
03-05-2008, 09:47 PM
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My 82 300CD also had the crack in between the fill hole and breather hose...I sold it like that...there was no seepage tho.
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles
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#13
03-05-2008, 09:52 PM
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Wow I'm surprised, they are not exatly a stressed part. Probably years of vibration.
I would just epoxy it, until a good deal on a junk yard cover comes along. A lot of these cars are junked, you can probably snatch a good one for damn near free.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#14
03-05-2008, 10:03 PM
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If there ever was a place for JB weld, this is it. I see this a lot in the boneyards....
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1984 123.193 372,xxx miles, room for Seven. 1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.
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#15
03-05-2008, 10:39 PM
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Quote:
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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