251 Flathead Hurt

[bambamshere]

So today I was a mopar show with my truck. I went to start it at the show and it started ticking. I turned it off went to inspect and everything looked fine. Then I drove it back home and all was fine. Ran great at the light on idle and then I got home and it started not banging but a real load ticking noise. All fluids are good. 

 

I am running 15W40 for oil. Should I be running ZDDP with the oil?

 

Anyone have any ideas? I don't think I blew the motor or anything but odd tick. Could it be a piston?

 

Thanks for the help

[Tooljunkie]

Sorry to hear that. If its a rod bearing, sometimes pulling a plug wire will make the ticking change. I would consider removing clutch cover and check for noise as well. How’s oil pressure? Stethescope on timing cover, really loose chain? Exhaust leak is another. Good luck! I hope its not serious,parts arent readily avaiable in canada.

[bambamshere]

9 minutes ago, Tooljunkie said:

Sorry to hear that. If its a rod bearing, sometimes pulling a plug wire will make the ticking change. I would consider removing clutch cover and check for noise as well. How’s oil pressure? Stethescope on timing cover, really loose chain? Exhaust leak is another. Good luck! I hope its not serious,parts arent readily avaiable in canada.

 

Thanks 

 

Oil pressure was really good. I changed the intake and exhaust manifold gaskets last year. I did however remember now that I went over a set of train tracks and the truck was all over the place. wonder if I dislodged something 

 

[John-T-53]

A rod knock will sound just like that....a knock, and you can sometimes feel it. Usually only makes the noise when under load. 

 

A "tick" is more likely a tappet coming out of adjustment. And will make the sound at idle and load.