02-04-2019, 12:22 PM
Gentlemen,
Something to exercise your little grey cells!
My 1932 RN is fitted with late Girling axles front and rear and a 4-speed box with Hardy Spicer propshaft.
Lately I have noticed a strange noise from under the car that seems to only occur when the engine is pulling hard, say up a hill, often in 3rd gear. It sounds like a muffled dull knock, as if the floor is being struck with a hammer from underneath.
It doesn't always happen, but when it does the timing between the sounds can be one second or as much as five seconds. I usually back off when it occurs because I don't know what it is nor what damage may be caused. The car otherwise drives normally although the CWP sings at 30 - 40 mph on light throttle only, never on the overrun or accelerating.
The gearbox and rear axle have been rebuilt with all new bearings.
I think the propshaft and joints are OK, but I haven't pulled anything apart yet.
Your collective thoughts will be greatly appreciated. Thank you!
Something to exercise your little grey cells!
My 1932 RN is fitted with late Girling axles front and rear and a 4-speed box with Hardy Spicer propshaft.
Lately I have noticed a strange noise from under the car that seems to only occur when the engine is pulling hard, say up a hill, often in 3rd gear. It sounds like a muffled dull knock, as if the floor is being struck with a hammer from underneath.
It doesn't always happen, but when it does the timing between the sounds can be one second or as much as five seconds. I usually back off when it occurs because I don't know what it is nor what damage may be caused. The car otherwise drives normally although the CWP sings at 30 - 40 mph on light throttle only, never on the overrun or accelerating.
The gearbox and rear axle have been rebuilt with all new bearings.
I think the propshaft and joints are OK, but I haven't pulled anything apart yet.
Your collective thoughts will be greatly appreciated. Thank you!