nasty knock, any ideas?

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ThomasLRNL

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71
All,

i rebuilt this engine and paired it up to my gearbox. however, im hearing a knock. All bearings in the engine are new and have maybe max 5 minutes of runtime on them. I did feel/seem to have a slight gearbox knock from before when i put this engine in. this leads me more towards it being a gearbox knock. but i would like to hear opinions of more knowledgable people.


 
If it's in neutral, then can't be gearbox? Check valves first. I'd look at the dizzy, then the cam gear. Couldn't see from the video, is there oil coming through the rocker shaft?
 
Wildefalcon said:
If it's in neutral, then can't be gearbox? Check valves first. I'd look at the dizzy, then the cam gear. Couldn't see from the video, is there oil coming through the rocker shaft?
Click to expand...
input shaft of the gearbox is always turning no…? i thought maybe its something there.

dizzy and cam gear what should i look for when inspecting those exactly? valves should be set correctly. yes oil coming through the rocker shaft and ive always had excellent pressure as well.
 
It's hard to tell from a video. Get a stick/rod mechanics stethoscope to isolate the knock.

Sounds cam shaft speed, not crank shaft speed.
 
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