When I had the injector cup and heads replaced last year on my N14, I seriously contemplated doing an inframe. I had the money at the time and figured it would be one of those, while I'm in there deals. I wasn't getting anywhere close to what you are getting in MPG, but I was holding steady at 8.75 and wanted to breach the 9's (with 1.5 million miles). The shop talked me out of the inframe for that reason and I'm glad they did. Personally if you are getting that fuel mileage and aren't using oil, I wouldn't do the inframe. Only thing I'd have done different would be to replace the only injector acting up (if it is that and not the harness) as my father had an injector issue when he owned my truck and the shop talked him into doing all 6 instead of just the one acting up. It hasn't been the same since (idles rough) and had to replace 2 injectors 3 different times as they had installed faulty injectors.
What was the blow-by like? That would be another reason to decide if you should do the inframe or not. Personally though I wouldn't because this seems like you have a great running truck DY!
Double Yellow's Company Driver to Independent Thread
Discussion in 'Ask An Owner Operator' started by double yellow, Nov 5, 2014.
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My 2 cents worth (tax free today) is.........
If It's got some Blowby,
& you've got the head off It, & can afford the Inframe (even if you can't)
INFRAME IT..
Also, If It was My truck (which it isn't) while you have the Head off.
I'd be checking all the valve seats & faces plus replacing all the valve springs as well...
Far easer & cheaper to only pay once for the labour...csmith1281, blairandgretchen and double yellow Thank this. -
Pictures:
The bad cylinder (which was not the one with the bad injector):
Close-up of the top of the liner above that vertical scratch:
Crosshatching on other cylinders:
Shop said top of this liner (#6) was looking like it was fixing to blow a head gasket:
If they do an inframe it'll take a week. They say if they do the bullgear too, it'll add another 30 hours. They say it doesn't really save any labor to do the bullgear with the head off because all the work is up front in pulling the hood & radiatorLast edited: Jun 5, 2015
csmith1281, Grijon, icsheeple and 1 other person Thank this. -
Without knowing for certain about the injector failure indicated (harness or injector), it's impossible to say if it had anything to do with the dilution flag. That may become more apparent now that the head's off, and I would expect you mentioned to the shop that fuel dilution result you had.
The blow-by measurement would be taken on a dyno with the engine under load. All will have some puffing out the breather while idling. I spent a bunch of time doing internet searches a while back trying to find standards, and they're all over the place. The consensus I reached was that an acceptable measure was less than 1" for most engines, less than 2" on a CAT ACERT. The latter due to the twin turbo and IVA setup. Supposedly. FWIW, my ACERT puffs quite a bit out the breather at idle and measured at 2" on the dyno at 79% rated power. Right at the limit. I was not there at the time to watch (truck was 1,000 miles away in San Antonio) and did not entirely trust the dyno results. This due to conversations with the dealer that indicated some carelessness. Anywhoo, 200k miles later it uses no more than a quart or two on a 15k change interval. So don't sweat some blow-by on it's own merit. It's an indicator, not a slam dunk.csmith1281, Grijon, Big_D409 and 1 other person Thank this. -
Seems I was editing while you were posting.
Not a positive discovery (cost and time wise) but does explain some things. -
But once I got the head off, the shop rightfully doesn't want to stand by any work where they just slap it back on -- they aren't even confident that #6 will hold a head gasket for long (I couldn't spot the problem, but they said the top of the liner had a slightly low spot).
So it'll be an inframe a year or so earlier than I might otherwise have needed. I'm leaning against the bullgear replacement for now just because the labor difference is minimal compared to doing it later & I'd rather spend those 4 days at home. That and I just bought insurance & have quarterly taxes due so my cash cushion is uncomfortably small.csmith1281, Grijon and RedForeman Thank this. -
I'd be doing exactly the same. Especially give your mention that the bull gear had been checked and found good, recently. -
Are you doing the inframe? Are you doing the bull gear? Have you got an estimate yet? Is this a garage you know?
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DY mentioned it was a referral but left it anonymous. The shop is new to him, but I made the referral. I've been using this shop for the past three years for nearly all truck, trailer, and reefer repairs. I consider them a substantial part of the reason I remain in business today. In fact, I purchased my latest truck from him. It's a 99 Century with a 12.7 that was built right there within the last year. It's been solid for 50k miles so far, and my son isn't gentle with it.
csmith1281, Grijon, Rocks and 1 other person Thank this.
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