Vibration issue between 4 and 4500 RPM
12-15-2017, 01:34 PM
#11
Gentleman's Relish
Join Date: Feb 2005
Location: AZ
Posts: 13,090
I may have to start replacing the easy things. Such as harmonic balancer, and motor mounts. I still have the stock rubber ones. I looked at my harmonic balancer and visually it looks fine. I grabbed it and doesn't seem loose nor is the rubber pulling out. As for my fan or radiator supports. I have an alum rad and electric fan. Everything seems tight.
If you have the crank and flex plat/flywhere for it, there is a 28 ounce one.
https://lmr.com/products/Mustang-Harmonic-Balancers
12-19-2017, 09:06 AM
#13
2nd Gear Member
Join Date: Aug 2017
Location: North Carolina
Posts: 489
Vibration issues between 4 and 4500 RPM
Pontiac 69,
It takes about one second to tell once you have the pan off. Lifting the casting numbers off the crank is the surest way of telling what weight your harmonic balancer is. If your engine is completely OEM, then it should be 50oz. If the engine has been modified, then all bets are off, and you are left with the crank casting.
It takes about one second to tell once you have the pan off. Lifting the casting numbers off the crank is the surest way of telling what weight your harmonic balancer is. If your engine is completely OEM, then it should be 50oz. If the engine has been modified, then all bets are off, and you are left with the crank casting.
12-19-2017, 09:16 AM
#14
2nd Gear Member
Join Date: Aug 2017
Location: North Carolina
Posts: 489
Vibration issue between 4 and 4500 RPM
Pontiac 69, all this interest in the harmonic balancer has me thinking again, yup, I know,very dangerous. If your ride is a shifter, how about that vibration coming from the clutch disc,and/ or pressure plate?
12-19-2017, 09:44 AM
#15
2nd Gear Member
Join Date: Aug 2017
Location: North Carolina
Posts: 489
Vibration issue between 4 and 4500 RPM
Pontiac 69, here we go again. 2M & 2MA are 28 oz imbalance, 2MAE is 50 oz. These are the casting codes that will be on your crank. Crank I.D. Nos. (302) should reflect these Casting I.D. Nos.-
2M-2MA-2MAD 28 OZ. 68/80
2MAE 50 OZ. 81/
I would leave this procedure alone, until all other options are eliminated.
2M-2MA-2MAD 28 OZ. 68/80
2MAE 50 OZ. 81/
I would leave this procedure alone, until all other options are eliminated.
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