I've just bought a '70 VW bus with a '71 Pinto engine. Runs great, but there is a significant vibration as I go through about 2400 rpm.
Not related to road speed or gear, just engine rpm.
Does this engine have a balance shaft, and if so, where are the timing marks to get it in sync with the crank?
Thanks,
Hello vanamaxagon,
There is no balance shaft in the ford 2000cc engine.
Do you have solid motor-tranny mounts???
Maybe broken mounts???
The stock tranny used to have a balance weight on the end of the tranny to help smooth out the vibes.
From Pintony
You may want to look at the clutch.I had one that did something Similar to this,It turned out that the disk was off center on the hub.
Another couple of things to check.
Loose flywheel bolts. Wrong, unbalanced flywheel and/or clutch assembly.
Look very closely at the accessory pulleys, especially in their recessed areas. Something like rust or crud may have been accumulating there over time and part of it may have broken loose, leaving a concentrated accumulation or weight on only one part of one of these.
Play a timing light over the accessory belts and pulleys at the front of the engine as you accelerate up to the point where the vibration comes in. You may have an accessory that has a loose belt, a loose pulley, a bent pulley, or a bad bearing. If you see one of the v-belts fluttering when you shine the timing light on it, that's a good tip that one belt or pulley is loose at the very least.
If you see any belt flutter, you normally only need to tighten that belt until the flutter goes away, as long as everything that it runs over is straight and in good condition. With a speed specific vibration such as you describe, something is definitely out of whack, and if it is one of the accessories rather than a belt that is loose or so old that it may have taken a "set", hopefully it will turn out to be something relatively minor and cheap to replace such as a water pump with a worn out bearing.
Another thing to think about is how certain you are that the engine actually is from 1971. It might not be....
There were 2 engines used in 1971, the OHV 1600cc (with OverHead VALVES, a rocker arm shaft and a timing chain) and the SOHC 2000 cc (with Single OverHead CAM, no rocker arm shaft, and a timing belt).
The SOHC 2300cc engine was used later in place of the SOHC 2000cc engine and the OHV 1600cc engine was dropped. One of the differences between the 2000cc and 2300cc engines is that the 2000cc used adjustable cam followers to set the valve clearances (equivalent to lifters in an OHV engine), and the 2300cc engine used non adjustable HYDRAULIC cam followers.