stu in wichita
Well-known member
Okay, I need help again. After the Ranchero's maiden voyage, I noticed a vibration at about 2000 rpm. I'm sure it was always there, but I had never noticed it until I drove it. The engine is a 1964 170, all stock with about 50k miles. I bought it used, but knew the owner - he changed his Comet to a V8. It seems like a great motor - starts easily, runs nice, no smoke, no noise.
At idle, there's no perceptible vibration - it runs like the proverbial sewing machine. As rpm increases, the vibration becomes noticeable. It's definitely not a misfire. it's pretty harsh, like something out-of-balance or bent. Revving the engine in neutral, it vibrates worse the faster it revs. Same thing if I rev it In gear with the clutch in. That kind of eliminates the transmission or dirveline. Now I need to figure out which end of the engine it's coming from.
My plan is to first remove the drive belts to eliminate the driven components (bent water pump shaft or damaged fan maybe). If it still vibrates, I guess I have to move to the other end of the engine. Not sure what to look for, but maybe something loose or damaged on the pressure plate. The flywheel and PP were used parts, but looked good when I installed them.
A few questions before I start taking things apart:
Thanks in advance for any help.
-Stu
At idle, there's no perceptible vibration - it runs like the proverbial sewing machine. As rpm increases, the vibration becomes noticeable. It's definitely not a misfire. it's pretty harsh, like something out-of-balance or bent. Revving the engine in neutral, it vibrates worse the faster it revs. Same thing if I rev it In gear with the clutch in. That kind of eliminates the transmission or dirveline. Now I need to figure out which end of the engine it's coming from.
My plan is to first remove the drive belts to eliminate the driven components (bent water pump shaft or damaged fan maybe). If it still vibrates, I guess I have to move to the other end of the engine. Not sure what to look for, but maybe something loose or damaged on the pressure plate. The flywheel and PP were used parts, but looked good when I installed them.
A few questions before I start taking things apart:
- 1. Is there more than one 8-1/2" recessed flywheel for these engines? If so, maybe I have the wrong one? The bolt pattern only allows it to mount one way. Are these flywheels "neutral balanced" or what?
2 Is it possible that the crankshaft balancer could be the culprit? The timing marks line up close, so even if it has slipped, could it be that far off?
3 Any other ideas on how to identify what's shaking?
Thanks in advance for any help.
-Stu