engine knock

[steveankc@gmail.com]

just put an engine together, started it up , has a hard knock when running. I have know idea why . rods are tight mains are tight . it is a b motor, correct pan on it ,new pistons and rods , aluminum timing gear, modern valves.. I need some ideas HELP steve

 

[Gene F]

Rod is hitting dipper tray.

 

[steveankc@gmail.com]

Is dipper tray different for the b engine? s

 

[ursus]

Is dipper tray different for the b engine? s

The dipper tray was lowered in late 1931 for the Model A in order to accommodate changes designed to reduce oil consumption while better distributing oil throughout the tray. This was carried forward with the Model B. A Model A dipper tray made previous to this change will be situated too high for a Model B engine and may result it rod dippers striking the tray.

 

[steveankc@gmail.com]

If the dipper tray was lowered how was that achieved? was the B pan d.tray changed or was the oil pan indention's reposition , lowered for the d. tray ?

 

[nkaminar]

If you have a drilled crankshaft and pressure lubrication, you can just leave out the dipper tray.