Rod knock

[Stevo88]

Morning all.

 

could anyone help me with this please. I fear it could be rod knock but is there a possibility it could be anything else. Thanks for your help. 

[savage bulldogs]

Unfortunately even listening to it on a video,  its difficult to know where the sound is coming from .

Anything from a blowing downpipe ,cracked header , sticky cam lifter or piston slap can sound like knock .

Normally low sounding metallic sound that increases in volume and speed with engine revs from 1.5 to 3k 

[nictriumph]

to detect rod or big end knock i use a long screwdriver and place in areas and listen thru the handle ofcoarse put your ear on screwdriver handle,,,good old way to detect problems in engine

[Jay762]

On 3/17/2021 at 11:16 PM, nictriumph said:

to detect rod or big end knock i use a long screwdriver and place in areas and listen thru the handle ofcoarse put your ear on screwdriver handle,,,good old way to detect problems in engine

used to use this technique for bearings and gauge internals on board, one of the first things I was shown 👍

[nictriumph]

old ways are the best in my opinion 😀

[Siluro]

I have seen videos on youtube where the knock is actually the Belt tensioner. Here is hoping.

[Mr B]

On 3/17/2021 at 10:16 PM, nictriumph said:

to detect rod or big end knock i use a long screwdriver and place in areas and listen thru the handle ofcoarse put your ear on screwdriver handle,,,good old way to detect problems in engine

If you wedge a cut down bottle or funnel on end of handle it amplifies the sounds much cleaner and don't need poke it in your ear .

Rod knock pretty easy recognise once heard a few, tends be most audible if rev to 2k and quickly lift off .
Very minimal rod knock can be hard concluded 100%  .

[Siluro]

21 minutes ago, Mr B said:

If you wedge a cut down bottle or funnel on end of handle it amplifies the sounds much cleaner and don't need poke it in your ear .

Rod knock pretty easy recognise once heard a few, tends be most audible if rev to 2k and quickly lift off .
Very minimal rod knock can be hard concluded 100%  .

Damn it, why have I never thought of that.
My dad first showed me that when I was a kid but not the funnel upgrade.