libellav15
Petty Officer 2nd Class
- Joined
- Jul 3, 2010
- Messages
- 177
Hi guys
I am getting close to solving my issue with my timing problem.
Info - 1972 Mercruiser 120 - GM in line 4 with pre-alpha leg.
If you check my other threads you will see that i have had an issue with the timing advance.
With pot 1 at TDC (compression stroke) the timing mark on the balancer and the zero position on the block match up perfectly.
But then every time i try to set 6 degrees btdc at 600 rpm in forward gear the timing mark on the balancer was about 2 inches too far to the left - ie mega advanced. On trying to turn the dizzy to bring the balancer mark to the 6btdc mark she would stall before i got even close.
However.....
And any advice on this would be appreciated.....
I have pulled the distributor off, and checked the mechanical advance weights and springs for corrosion, damage, unfastened etc etc -
cleaned everything up and all nice and smooth action again but i noticed on re-assembly that both springs are really very puny ones.
even by spinning the cam by hand i can make both weights go to max out position.
I believe they are supposed to be one small and one chunky - is that right?
and where would i find the weight/tension of the springs i need - are they just standard for the engine/distributor type?
out of interest - how exactly does the weights moving outwards advance the timing?
cheers
adam
I am getting close to solving my issue with my timing problem.
Info - 1972 Mercruiser 120 - GM in line 4 with pre-alpha leg.
If you check my other threads you will see that i have had an issue with the timing advance.
With pot 1 at TDC (compression stroke) the timing mark on the balancer and the zero position on the block match up perfectly.
But then every time i try to set 6 degrees btdc at 600 rpm in forward gear the timing mark on the balancer was about 2 inches too far to the left - ie mega advanced. On trying to turn the dizzy to bring the balancer mark to the 6btdc mark she would stall before i got even close.
However.....
And any advice on this would be appreciated.....
I have pulled the distributor off, and checked the mechanical advance weights and springs for corrosion, damage, unfastened etc etc -
cleaned everything up and all nice and smooth action again but i noticed on re-assembly that both springs are really very puny ones.
even by spinning the cam by hand i can make both weights go to max out position.
I believe they are supposed to be one small and one chunky - is that right?
and where would i find the weight/tension of the springs i need - are they just standard for the engine/distributor type?
out of interest - how exactly does the weights moving outwards advance the timing?
cheers
adam