Cat 3126 engine failure

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captfrank
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Cat 3126 engine failure

Post by captfrank »

Well Just got a knee replacement so I was not able to go but my buddy took the boat last Thursday and on the way back heard a loud bang and lots of noise from port engine so immediately shutdown.

Upon further investigation found the oil level way high and no antifreeze in the tank but some in expansion tank at normal level. Decide to remove the head. Found a huge hole in cylinder wall AFT bore. Only 2600Hrs on these engines and I bought the boat off a buddy that put these engines in so I have been on the boat most of these 2600 hrs and its been taken care of changing oil before the Cat 250 hr cycle (have always used Cat oil from day one) , cleaning coolers every couple years etc.

We where told by a rebuild shop this is normal failure of Cat 3126. The injector fails apparently open and puts a bunch of fuel in cylinder and thus can not compress and blows out the cylinder. We had no warning etc on this or any maintenance that injectors should maybe be changed at 2500hrs to avoid this (looked on net could not find anything). I'm really disappointed with CAT as my buddy bought this boat with the 3116 CATs that had the soft blocks and thus blew one up about same hrs back in 2003 and put these new engines in. They don't seem to be reliable and a lot of money for engines (he paid over 50K to install these in 2003) that only seem to last 2600hrs or so. They should last like 8k if taken care of or more.

In any case anyone know where might be the bets place to get a re-manufactured engine?
1980 35ft Bertram "Bail Out" Indian River

dougl33
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Re: Cat 3126 engine failure

Post by dougl33 »

Oh man, that sucks. Sorry.

Any thoughts on what you'll do? Repower or replace? I feel really bad for your buddy too. He must've shit his pants.
Regards, Doug L.
1986 33 Bertram FBC Cummins 6BTA's Queen Elizabeth
Marblehead, MA
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captfrank
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Re: Cat 3126 engine failure

Post by captfrank »

Likely do a long block. It's like $6800. But will likely costs 10K+ before done with us doing the work.
1980 35ft Bertram "Bail Out" Indian River

dougl33
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Re: Cat 3126 engine failure

Post by dougl33 »

That plus the cost of changing all of the injectors in the other engine for good measure.
Regards, Doug L.
1986 33 Bertram FBC Cummins 6BTA's Queen Elizabeth
Marblehead, MA
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