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Old 11-22-2020, 06:09 PM   #1
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3126 engine removal

Just searching for the procedure for removing a 3126 Cat engine from my Newmar Dutch Star pusher.
I'm not sure where to start! Looks like it could be quite a challenge from what I am seeing.

TIA
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Old 11-22-2020, 06:18 PM   #2
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What is wrong with it that requires removal of the whole engine?


And, verify this is a rear radiator/CAC not side radiator/CAC coach.
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Old 11-22-2020, 06:24 PM   #3
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My I ask why you are removing the engine?

A lot of work can be done in frame. I worked for a coach co in Australia and aside from a total rebuild most work was done in the coach. I realize that the DS is more enclosed..

When or if you remove it, just be careful. That engine is very heavy. You will need a special lifting attachment.

Good luck. Let us know how you get on.
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Old 11-22-2020, 06:29 PM   #4
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My 01 DSDP is currently at the Albuquerque cat house getting a transplant due to a dropped valve in number six cylinder.

I have not seen it but the shop foreman tells me they have a specialized hydraulic lift to raise the coach up high enough that the engine can be lowered out the bottom.

he also mentioned they will pull the engine and transmission as one unit then separate them out in the open on the floor where they have room.

I was quoted US$8500 plus whatever incidental pieces are needed. Filters, oil, etc
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Old 11-22-2020, 06:49 PM   #5
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That's the way I'd have to do mine if I ever had too , out the bottom .

Trans hangs from the back of the motor so easier to remove on the floor .

Sounds like they have the system down.

The rear bumper , rear frame crossmember and possibly the trailer hitch would have to come out if you tried to go out the back.
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Old 11-23-2020, 12:56 PM   #6
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From what I read about my '02 Winnie with the 3126 Cat, you remove the entire back shell of the RV, Not a big deal, just a few screws and bolts. Than you remove the rad by dropping it down into a pit. So far so good. Now move it out so it's not over the pit and using a tranni cradle remove the tranni.

And that's all I remember. Shop needs to have big equipment for big vehicles so have the work done in a truck shop or a school or city bus shop.
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Old 11-23-2020, 05:23 PM   #7
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[Mod Edit]

At 1300 lbs , without the transmission , even I wouldn't consider this a DIY job.
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Old 11-23-2020, 09:46 PM   #8
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One cylinder is egg shaped? Possibly from the factory? Has to be over bored and sleeved, so Iv'e been told. It only has 90,000 miles on it, so I am thinking it was a factory error, but how am I gonna know if a new sleeve and piston is gonna fix it? I am in to is so deep now, I can't quit!
Thanks for the reply
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Old 11-23-2020, 09:50 PM   #9
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x2 on in-frame if it can be done. And you can have confidence in sleeving it, but are you sure that is what it needs, and all it needs? How’d they come up with that diagnosis without the engine disassembled?
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Old 11-23-2020, 09:51 PM   #10
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It was towed to a small shop @ $3500.00, so is kinda stuck there and they are doing everything they know how to do and are very respectable people, but this is even a little over their heads I think! The engine only has 90,000 miles on it, so I think it was a factory error, but worried why? and if it will be fixed in the end. Wondering if the crank would have anything to do with it? Why did this happen anyway? uno?
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Old 11-23-2020, 09:56 PM   #11
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Thanks!
Their plan is to remove the bumper and go out the back way. Hope it is all worth it, the engine only has 90,000 miles on it and one cylinder is egg shaped and I am wondering why? Could he crank be an issue too? Just hope it is all worth it!
Thanks for the input
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Old 11-23-2020, 09:56 PM   #12
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I had a valve break and drop onto the top of the #6 piston and hammer itself into it. The shop did NOT remove the Cummins 5.9 engine. They worked from underneath and from up in the bedroom. The machinist guy was a heavy drinker so they got to do it twice, once for free. Rebuild worked fine for several years after.
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Old 11-23-2020, 10:06 PM   #13
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Tore engine head off because it was cracked from an overheat issue.
replaced with reconditioned head and started and wouldn't build power, idled fine, but wouldn't power up. From there all sensors were changed and New turbo and Heui pump and lift pump were changed $ and the EMS was checked. A year into the project now. And a Caterpillar mechanic asked if the pistons and crank were ok? So head was pulled again and they found one cylinder was egg shaped? Now I am questioning if it was a factory defect, and if so how do we know if the crank isn't off in some way??? Getting desperate and expensive.
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Old 11-23-2020, 10:10 PM   #14
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It is side hyd fan cooled radiator.
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