4-53 detroit rattles on deceleration

[crbearden]

I have a 4-53 detroit powering an Ingersoll Vane type compressor. When the pump is up to pressure and the engine decelerates a loud clicking noise is apparrent. Sometimes this noise continues at idle, and then is intermittent. The noise is not heard when the engine is loaded however. I am trying to determine if this is in the lower end or a piston problem.

 

[td25c]

Oil pressure on engine all cool between idle and full throttle ?

 

[funwithfuel]

I would be curious if you have a splined coupler or a Lovejoy.

 

[kshansen]

I would be curious if you have a splined coupler or a Lovejoy.

I was thinking along the same line, that the noise when compressor is unloaded might be looseness in the compressor or the coupling.

Can you slightly open a valve to put a slight load on compressor but keep engine speed low to see if that makes noise go away?

Or maybe take a video of it running and upload to YouTube then post a link here so we can hear it?

 

[funwithfuel]

Is this machine new to you? Are you new to driptroit? They have a tendency to have a "ring" from the accessory drives when at idle. Next question, how is your alternator driven? Belt or coupler? A video would be best as Kshansen suggested.

 

[thepumpguysc]

I'm w/ FWF.. check coupler between the pump & engine.. most likely place for a rattle..

 

[OFF]

I agree, got to be the coupler between the engine and compressor.

 

[Vetech63]

Coupler x10