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  #11  
Old 10-01-2007, 03:45 PM
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Originally Posted by Bandit102
My DD50 (500hp) has done this twice. Load her up, you lose water. Run at high idle, whatever you want to do to make it leak at the shop, no way. Never heated at all. Both times, we pulled the head and found a leak between 3 and 4. I'm told this does not happen, but when you remove the head from my detroit, the block sags about .011" in the middle. We have to remove the pan and jack it up in the center when doing the head. That's my experience with the same symptoms. Oh, the last time it did finally get bad enough that it would bubble some in the radiator tank at high idle. We used the fluid and the suction pump thing that you put in the radiator and NEVER detected combustion gasses in the cooling system, but the head gaskets were bad nevertheless.

we'll assume you mean series 60 as this engine has 500hp

so...., how much sag was there after jacking up the block? ... the head DOES NOT hold the block up, despite what you've been told

there must be exhaust gases in the coolant for the blok-chek to work. it can be helpful ....... there is no 'see-all, tell-all' tool for this problem, it's a process of elimination
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  #12  
Old 10-01-2007, 07:27 PM
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You're right, Bob. It's a 60, I made a typo there. With the jack in the center, the sag is .015". I know it shouldn't do this as I've run out and straight edged everyone's engine around here that has had the head off and mind seems to be the only one to do it that badly. I inframed it back in May but don't think she'll go again. The block was eaten up around the lower sleeve o-rings and the counterbores didn't look the greatest. Think I'll just repower it next time it gives me a hard time. Only spent $2k on the inframe, doing everything (pistons, liners, bearings, bull gear, etc. did the head myself with new valves, guides and springs) Used Clevite parts, as I've had good luck with them in the past. Had a hell of a time getting the gear backlash right on the bullgear. Ugh.
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Old 10-03-2007, 01:39 AM
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Still planning to take the truck to the other shop when he gets back from this run and have them check it out. Seems everything I search on and read - ask it seems to be coming back to the head gasket though.

To add a little icing on the cake, driver called this evening half way home and said the turbo let go. Eh.........tow bill, hotel, parts & labor....... my wallet seems to be burning more than it is taking in lately.......... SOOOO glad I took the GREAT advice from a lot of you guys when I was deciding whether to get into this trucking deal and setup a maintenance fund for such times as this........ :cry:
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Old 10-03-2007, 02:22 AM
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Most of those 500 Detroits seem to have a really small turbo on them, with a small shaft. I've seen lots of them twist the shaft. Mine has a big turbo, no wastegate; bigger than I've ever seen on a Detroit. Maybe someone changed it out at some point, but I've never had a problem with mine and 30-35psi manifold pressure is what I get. Dunno about the others.
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Old 10-03-2007, 02:29 AM
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depends on the year as well, newer turbos are much larger.

The new holset(cummins) turbo for 2008 is even bigger.
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Old 10-03-2007, 01:36 PM
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Mine's an older one -'99
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Old 10-04-2007, 10:16 PM
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Quote:
Originally Posted by Bandit102
Most of those 500 Detroits seem to have a really small turbo on them, with a small shaft. I've seen lots of them twist the shaft. Mine has a big turbo, no wastegate; bigger than I've ever seen on a Detroit. Maybe someone changed it out at some point, but I've never had a problem with mine and 30-35psi manifold pressure is what I get. Dunno about the others.

the older detroits (ddec 1 & 2s) had a larger turbo w/o a wastegate... that's probably what they've swapped it out with..... "a detroit's a detroit", right?!? No wonder they didn't try to tie a blower to the exhaust manifold ; ) the non-wastegated turbos are generally slower to spool up at lower rpms, but 30 - 35 pounds should be safe enough anyhow
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Old 10-05-2007, 01:59 AM
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Right, as usual, Bob. She's very slow to spool at lower rpm's. But, after all, it is a Detroit. What do you think about my block sagging? Junk?
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Old 10-08-2007, 01:58 AM
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Got the truck to the "other shop" (that everyone in the business says is THE BEST place to take it) on Friday evening and they ran a quick test of some sort (I wasn't there) and said they are almost certain it is the head gasket. They are going to pull the head tomorrow morning and give me a call to tell me what they find, how it looks and where we need to go from there. Will let you guys know how it goes........
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Old 10-10-2007, 04:09 PM
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Well, ended up being the head gasket for sure and unfortunately the head was damaged from running it for a few weeks that way. SO........ replacement Detroit head, new cam bearings and head gasket job and we are back on the road. Wallet sure is lighter though.

Thanks for all the help and input guys. That is what makes this forum valuable.

Dang, I'll tell ya owning this truck has been an experience for sure, but am learning a lot....... since getting it with 500K on it it has had.....

water pump
air to air
A/C compressor
Air Compressor, air dryer
turbo
king pins, wheel bearings, drag link, tie-rods
steer tires
front shocks
fan clutch
head, gasket and cam bearings

and it is / was in REALLY good shape to be a 96 model (miles were ECM verified). Hopefully, we can run for a for a good long while
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