84 C10 with I6 -Rod knock?
 

I just picked this truck up from an 85 year old guy that had 5 cars and his wife can't drive. He had a reciept for a new motor and trans. First thing that was noticable is rocker noise. I adjusted the rockers by pulling the valve cover and starting,then turned until the ticking started and then turned it back until it stopped- went a 1/4 turn and then 1/8 turn. The motor doesn't smoke at all.

Can timing cause this sound??

Thanks in Advance,
Chris

Here is a movie of what I'm hearing


It did get quieter and then I seaformed the motor and it got even quieter. I changed the oil and it was black but nothing out of the ordinary.

Re: 84 C10 with I6 -Rod knock?
 

take a wood/metal rod and put it on different places of the engine and listen in the end of it... normally you can al least find out where the noise is coming from.

Re: 84 C10 with I6 -Rod knock?
 

The fuel pump has a lot of racket when I touched it with the piece of wood - can that cause the noise also I heard it through the exhaust too

Re: 84 C10 with I6 -Rod knock?
 

I would look at the flexplate/flywheel bolts . I have seen them come loose after an engine trans install . If it is an auto , also check the torque converter bolts.
Frank

Re: 84 C10 with I6 -Rod knock?
 

That doesn't sound like a rod knock. A rod knocking has a deep sound to it, kind of like stomping your foot on the ground. That sounds like something either in your valvetrain or possibly piston slap. I can't tell from an internet video, piston slap isn't usually THAT noisy but the video might over exaggerate it. It also usually goes away once the motor warms up and the pistons expand and create a tighter fit in the cylinder.

Re: 84 C10 with I6 -Rod knock?
 

Yes loose bolts , also GM flex plates can crack between the large holes...

Desert

Re: 84 C10 with I6 -Rod knock?
 

It is a constant sound- No change when it is warmed up.

it is a 3 speed auto with a newer trans with 15 K on it

I did notice that the cat converter has a quarter size hole in it and so does the muffler. I'm thinking of replacing the exhaust along with a new fuel pump. I will pull the flywheel cover and check the bolts tonight if I have time.

Re: 84 C10 with I6 -Rod knock?
 

Bump.

Checking the receipt for the motor-flywheel is new
Verified bolts are tight on the torq converter and no cracks in the flywheel.

Re: 84 C10 with I6 -Rod knock?
 

Update

New exhaust and the truck passes emissions with no problems at all. Still ticking but not as bad and it starts with two pumps of the gas.

Fuel pump is new-that helped it run better. I'm driving it everyday, the shop that did emissions said they thought it could be the lifter

Any suggestions?

Re: 84 C10 with I6 -Rod knock?
 

It's hard from a video to know exactly what it is, but it definitely sounds like something in valve train. Agreed that it does not sound like a piston, but you never know. I would try more top end work and see if you can narrow it down some.