470 knocking noise

[jabfd]

Hi guys
the end of last season it starting to make a knocking noise at idle if I throttle it up noise goes away. Motor runs great except for the noise that only happen at idle. I pull one spark plug wire out at a time and the noise never went away. It sound like it coming from the front bottom of the motor but not sure. Any suggestions would be greatly appreciated thank you.

Be the the way I have power steering and alternator conversion stator was removed but the magents were not and it’s still on the balancer.

 

[Scott Danforth]

when was the lst time you pulled the drive and inspected the u-joints and gimble?

have you inspected the flappers?

 

[jabfd]

Hello. Drive was out last year and I joints were good a greased gimbal was also good and was changed 5 years ago
flappers? Is this exhaust flapper not sure it will be this thenoise is coming from the front

 

[jabfd]

Just read some other post I will check the flapper tomorrow to be on the safe side

 

[jabfd]

Just checked flapper and although it doesn’t look perfect it still had rubber on it I will be ordering a new one started it up and it still knocking anybody have any other ideas thanks

 

[wrestling coach]

I have a '82 470 that I would consider to be in good mechanical condition. I have a knock also at idle. It has done it since I've owned it now for 6 years. It might be piston slap that I'm hearing. Bottom line is this little motor runs strong and I maintain it. I have heard others describe these same symptoms. I'm not concerned about it.

 

[jabfd]

I think your right my engine runs great and starts easy even with the knock I think it could be a connecting rod but not sure if I raise the rpm to 1200rpm no knock and sounds good. Any thoughts?