mchan68 Posted December 9, 2008 Share Posted December 9, 2008 Hey Bruce, do you happen to have a cutaway photo of a 7.3L cylinder head assembly similar to the one you posted for the 6.0L? If so, do you mind posting it? I got an E-series here that just got dropped off by a small used vehicle shop. It's been ages since I've wrenched on any 7.3L so I'm a little rusty on the diag processes. Being a retail issue, I want this to have a ZERO probability for unforseen circumstances or a comeback. I'm pretty sure that on these, the cup(s) will usually be the culprit for fuel being introduced to coolant, unlike a 6.0L. I'm supposed to remove all eight injectors out and pressurize the cooling system and find the offending cylinder with the cracked cup, correct? Failing this, it's cylinder head(s) time? Sorry if it seems like a dumb question, but I got about four 6.0Ls on the go right now for major repairs as I post this, so I'm getting a little backed up. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted December 9, 2008 Share Posted December 9, 2008 When I get a 7.3 Econoline with fuel in the coolant, I don't waste too much time diagnosing in chassis. I just quote to pull both heads and replace all 8 cups. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted December 9, 2008 Author Share Posted December 9, 2008 When I get a 7.3 Econoline with fuel in the coolant, I don't waste too much time diagnosing in chassis. I just quote to pull both heads and replace all 8 cups.That's exactly what I did. So you're saying I need to add eight cups to the quote? New heads don't come with cups already pressed in? Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted December 9, 2008 Share Posted December 9, 2008 Alex, if your doin' egr coolers with turbo on, then you can do cups in chassis, no? I gotta tool to extract them things right out. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 9, 2008 Share Posted December 9, 2008 I love Bruce's cutaways. He has a few in PhotoPost but here is the 7.3 head he uploaded. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted December 9, 2008 Author Share Posted December 9, 2008 Thanks Keith. /forums/images/%%GRAEMLIN_URL%%/thumbup.gif Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted December 9, 2008 Share Posted December 9, 2008 Yes, yes, yes, and thanks, Keith. PS: I wouldn't pull the heads. I can't remember doing this task, but I'm pretty sure it can be done in the chassis with heads on. I remember one of my friends telling me the procedure: Use the tool to thread the cups, use the puller tool with a bolt through a large socket or round sleeve sitting on top of the head, and into the puller tool. Tightening the bolt into the removal tool will suck the injector cup out and into the socket, with minimal clearance needed above the head. You may have to drop the motor mounts or roll the engine, but that's easier than pulling heads. IIRC, I don't remember him doing anything with the mounts....... Good Luck! /forums/images/%%GRAEMLIN_URL%%/grin.gif Quote Link to comment Share on other sites More sharing options...
BrunoWilimek Posted December 9, 2008 Share Posted December 9, 2008 A little dab of dielectric silicone will hold a coin(a dime if memory serves correctly)down in the bottom of the cup to plug the hole so no filings go in the cylinder. /forums/images/%%GRAEMLIN_URL%%/readthis.gif Quote Link to comment Share on other sites More sharing options...
coop Posted December 10, 2008 Share Posted December 10, 2008 As well as the coin trick you could also use a foam ear plug if your shop has them.squish it down and use some long needle nose pliers to put in the hole and let it expand. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted December 10, 2008 Share Posted December 10, 2008 Low tech works just as well. A shot of chassis grease from the grease gun in the bottom of the cup, or wadded up snot rag..... /forums/images/%%GRAEMLIN_URL%%/grin.gif Quote Link to comment Share on other sites More sharing options...
STROKER_T Posted February 3, 2009 Share Posted February 3, 2009 Hey,I wonder of anyone has seen where the lower o-ring on all but one of the injectos has been eaten away... I got one in today,a 99 F350 with 74K,that has fuel in the coolant resevoir.Pulled all 8 injectors,and #2 cylinder is the only one that didn't have a chewed up bottom o-ring.All other upper o-rings look fine,and the center part of the injectors are discolored,probably from coolant intrusion. The customer later informed us he's been adding marvel mystery oil to fuel tank...would that cause the o-rings to break down? I dont see any leaks at the injector cups as of yet,but the fuel has to get in the coolant through either the cups or head castings,right? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted February 3, 2009 Share Posted February 3, 2009 There's three o-rings, and you're talking about the lowest one, right? No, I haven't seen any problems with a set of the lower rings, usually the center and upper o-rings are damaged by HPOP pulsations. On occasion I see the lower o-ring damaged by a loose injector (leaking combustion) but not on a set. Fuel in the coolant is almost always injector sleeves. Put a set of sleeves and o-rings in it and you'll be fine. Good Luck! Quote Link to comment Share on other sites More sharing options...
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