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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

anyone familar with this engine?

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Oldcraneguy

05-20-2007 08:56:47




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Had some probs with my crane a few wks ago, was runnin down the hiway WOT and looked down to notice temp @240 and oil press @15..pulled over and it died. after letting it cool for about a half hr I cranked it up and it had a bottom end knock that sounded fatal to me, got it towed to the local shop (our mech's are swamped) and they told our service mgr that the engine was shot and had to be replaced. Im wondering if the 3126(300hp) cat has sleeves or not? I didnt care for the engine anyway(used oil.no power) but Im wondering why it cant be rebuilt? you know, liner kit,turn crank and slap it back together and go...I didnt try to cool it down fast with water so Im doubting that the blocks cracked..just wondering if anyone knows more about this engine

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Weldin man

05-21-2007 10:21:37




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 Re: anyone familar with this engine? in reply to Oldcraneguy, 05-20-2007 08:56:47  
I thought the 3126 was the replacement electronic version of the 3116. People around here call these throw-away engines, but they can be rebuilt by boreing, sleeving back to standard . I just did a 5.9 cummins,basically the same set-up. Engine kit and all machine work including head and polishing crank was around $2500.00 a long ways from the $10.500 the dealer wanted for a new engine. My turbo, pump and injectors were all OK and I did my own labor.

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Bob/Ont

05-22-2007 05:26:53




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 Re: anyone familar with this engine? in reply to Weldin man, 05-21-2007 10:21:37  
Early ones mechanical fuel system, later ones B models I think electronic HUEI.
Later Bob



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Bob/Ont

05-21-2007 10:08:03




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 Re: anyone familar with this engine? in reply to Oldcraneguy, 05-20-2007 08:56:47  
CraneGuy, it's bored in block. Can be dry sleeved, think you could get a Cat Reman drop in for it. Might be better to stay with that one than the HUEI(electronic) one.
Later Bob



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NCWayne

05-20-2007 18:47:05




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 Re: anyone familar with this engine? in reply to Oldcraneguy, 05-20-2007 08:56:47  
I"m not that familiar with the 3126 but nowdays, in general, it"s just as cheap (or as expensive depending on your point of view) to get a new or reman engine as it is to pull and rebuild one. I recently replaced a 3066 in a customers machine. No reman available from CAT, but a new one was immediately available for right at $14,000. To get a reman from the aftermarket was $8,000 plus shipping both ways, then you had to reuse/rebuild the old turbo, along with swapping many other external parts. With the shipping, a turbo rebuild, misc gaskets, etc, along with the labor to remove and reinstall everything the new engine wasn"t but about $2,000 more. To have pulled the old one and done a complete overhaul would have been around $12,000+/-, again maybe a $2000 savings. If you take into account the amount of downtime if I had gone with the the "reman" and waited on shuipping, or to do an overhaul of the existing engine (several weeks down depending on parts and the machine shop) the extra $2,000 makes the new engine a steal. As it was he got a new engine from fan to muffler and I had everything done in two days. Like I said in most cases nowdays with the cost of labor and the cost to the customer for their machines downtime makes a new or "the right" reman is a no brainer. As far as the 3126 as an engine I"ve heard nothing but good about them. True their used in many "medium to heavy" truck applications that leave the vehicle underpowered but that"s not the engines fault. Used in the right application it"s a pretty good engine.

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RAB

05-20-2007 10:33:37




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 Re: anyone familar with this engine? in reply to Oldcraneguy, 05-20-2007 08:56:47  
May be nothing to do with whether or not the engine is over-haulable. May simply be cost (including down-time). If the engine has to come out anyway, so much less time to slot in a replacement and be up and running. You didn"t say it had to be a brand new motor, so probably just a service exchange so the old motor will then be returned for reman afterwards.
Regards, RAB



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Oldcraneguy

05-20-2007 10:57:29




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 Re: anyone familar with this engine? in reply to RAB, 05-20-2007 10:33:37  
Apperently they dont make the 3126 anymore, I thought they would be able to get a reman long blk pretty easy but that hasnt been the case...Im hoping they find something with some more stones cause of the supposed 300hp Im thinkin at least hundred of em were lame, it was fast enough once you got it rollin but that seemed to take forever, Im hopin for something with some more cubes, those small displacement engines just dont cut it for me..on the plus side it was very good on fuel, thats about all I can say good about it...

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2x4

05-25-2007 22:41:53




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 Re: anyone familar with this engine? in reply to Oldcraneguy, 05-20-2007 10:57:29  
Gmc/chevy used used 3106, then 3116, then 3126 in TopKick trucks so should be some in junkyards.



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2x4

05-26-2007 11:09:34




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 Re: anyone familar with this engine? in reply to 2x4, 05-25-2007 22:41:53  
also 1999 Freightliner FL70's used 3126. They are 190 hp. I think you would be happier with a 8.3 Cummins w/Eaton Fuller 9 spd. tranny.



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