Not getting a good vibe

[727]

If I take the belt off of the water pump/alt and run the engine. It's as smooth as silk.
I swapped the water pump pulley and the crank pulley, still has a vibe.
Going to put the idler pulley set up on tomorrow with just the water pump to see if it changes anything.
I swapped the alt sliding bracket out for a shorter one, and installed different belts with no change.
I have some different alternator brackets and going to cycle them trough tomorrow. I'm trying everything I can think of.

 

[khryslerkid]

If I take the belt off of the water pump/alt and run the engine. It's as smooth as silk.
I swapped the water pump pulley and the crank pulley, still has a vibe.
Going to put the idler pulley set up on tomorrow with just the water pump to see if it changes anything.
I swapped the alt sliding bracket out for a shorter one, and installed different belts with no change.
I have some different alternator brackets and going to cycle them trough tomorrow. I'm trying everything I can think of.

How about you fan blade? You could remove that, bolt the pump pully on with short bolts and see what happens.

 

[SublimeSixpack]

If I take the belt off of the water pump/alt and run the engine. It's as smooth as silk.
I swapped the water pump pulley and the crank pulley, still has a vibe.
Going to put the idler pulley set up on tomorrow with just the water pump to see if it changes anything.
I swapped the alt sliding bracket out for a shorter one, and installed different belts with no change.
I have some different alternator brackets and going to cycle them trough tomorrow. I'm trying everything I can think of.

I know you said the water pump was new, but it seems that you have eliminated everything except it. It's unlikely that you'd have a new defective water pump on both the 440 and the 400, but . . . .

 

[WP29440SE]

yeah man , take just the fan off and bolt the pulley on the water pump and run it. you can use the original fan bolts just space them out with washers or whatever

 

[727]

I have run it with the fan off and the pulley bolted on and no improvement was noted. Something is transmitting through the water pump or alternator.

 

[miller]

If I take the belt off of the water pump/alt and run the engine. It's as smooth as silk.

I'd say you've found your problem. Get a 'good' water pump, and make sure you have the correct pulleys.

 

[727]

Loosened up the bracket bolts on the alt today and vibration went away.
So I removed the stainless steel Mopar Perf dress up bolts and just went back with grade 8 bolts. I installed copper washers behind all of the attaching points for the alt. Finally took the alt off of the engine that was in the car before I did the swap. Turns out the pulley on the old alt is larger than the two new alternators I tried. Not sure if it was any one thing but my problems have disappeared. Would have never guessed something so unassuming would make so much trouble. Now I have to man up and put the 440 back in the car.
Thanks for you help and ideas.
Merry Christmas!
727

 

[MrJLR]

Could be an ignition issue causing a miss.....
Oh dang....just saw it's solved...glad to hear it!


Jeff

 

[Ron Ward]

Just on a hunch... and it's only a hunch.... Check your firing order on the spark plug wires. I had a car do this and #5 and #7 were crossed up. Shook the bejeezus out of the car.