Does the CTD "rock" much on it's engine mounts?

[BigGunZ]

As the title implies. Under a load, does the CTD rock on it's mounts? I'm asking because the IC is mounted to the chassis and that's obviously one of the reasons for flexible couplers. Has anyone ever had their head in the engine compartment during a run on a brake dyno to notice this?

 

[johncameron]

Yes it does, I dynoed on a load dyno before my injectors and it twisted in the bay. Not enough to say it was gonna flip over but noticeable on the video.



BTW, a CTD does ROCK!

 

[rbattelle]

This is a great question! I've always wondered just how much (in terms of degrees) the engine will twist under load.



-Ryan

 

[BigGunZ]

By chance did you notice the factory turbo to IC, and IC to manifold couplers, and how much they twisted?

 

[BigGunZ]

BTW, a CTD does ROCK!

Exactly

 

[RMalone]

Good point BigGun, those couplers would seem like the primary spot where huge engine flex could cause trouble.

 

[JonathanBurk]

Kind of a related question:



When you turn off your Cummins does the engine shake and shimmy back and forth like it's going to fall out of the truck?



I assume this is normal, I feel like it's herbie shaking off water.

 

[MacHaggis]

I wouldn't worry too much about any movement of the engine creating problems. There is enough flex in the IC plumbing to handle the movement of the chassis on the frame, which I should think would be greater that the engine "rocking" under torque.

 

[BigGunZ]

I wouldn't worry too much about any movement of the engine creating problems. There is enough flex in the IC plumbing to handle the movement of the chassis on the frame, which I should think would be greater that the engine "rocking" under torque.

I'm not worried about the factory couplers creating problems, but I want to switch to stouter couplers and am wondering if they will cause problems.

 

[rbattelle]

When you turn off your Cummins does the engine shake and shimmy back and forth like it's going to fall out of the truck?

I assume this is normal, I feel like it's herbie shaking off water.

Absolutely normal.



-Ryan

 

[scotty1]

I can tell you it may look like its rocking a lot but its not moving a whole lot.

I ran my shaker hood up through the factory hood and the belly pan of the shaker was mounted to the engine. Under load it would move about 1/4". The hole I cut was enough to avoid having the shaker hit the factory hood.

There was 3/8" of space all around the shaker. It moves more towing under load going through the gears then running empty.



Scotty

 

[CumminsBu]

Kind of a related question:



When you turn off your Cummins does the engine shake and shimmy back and forth like it's going to fall out of the truck?



I assume this is normal, I feel like it's herbie shaking off water.

Thats how a real diesel engine comes to a stop.

You should feel a Train engine. :-laf

 

[SHobbs]

Locomotives are cool at shutdown. Darn crank shakes the whole unit when it comes to a stop. Talk about alot of iron coming to a stop.