Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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So...i know a little bit more now, but the problem is still here...What i know so far and what was tested:
Problem: ENGINE is not shaking in neutral or maybe is shaking so little, that you can't really notice. Whan you apply gas it shakes. SHaking than translates to the whole car and steering wheel. The more gas you give, the more it shakes (when the car is standing still, so the car is not a problem).
We have disconnected the fan and shaking is the same so it must be the engine.
I have a Mustang Coupe, 302 engine, 3 speed manual trans., 1965.
- Crankshaft : 2M A
- Engine block: C8OE 6015 A
- Balancer (old one, it was replaced with a new one now): C5AE 6316 A2
- C6ZE-6380-A is my flywheel number
What has been tested or replaced:
- Spark plugs are ok, wires are ok too
- Engine mounts are ok
- Balancer was replaced with a new one for 302 and shaking is the same.
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Check the timing. My car did that a couple of weeks ago, at any speed, it felt like the whole front suspension was going to come off of the front of the car. I advanced it a little, and it went away. My timing was set at 16 degrees BTC.
It helped me. What is your timing set at?
81... we where both wrong...my apologies. anyways as i said i put a 91 302 in my 67 mustang and just to get it going i used a 28oz balance flexplate and the problem was exactly as you described. it looks like your crank is the 28oz imbalance. but i was shipped two incorrect flexplates before i received the proper one. one was a 28oz 157tooth and the other was a 50oz 164 tooth when i ordered a 50oz 157, i guess im trying to say double check your flywheel with the part number
I had a "shaking" problem a couple of years ago. It turned out to be my motor mount. Mine would only shake when I put the car in reverse, driving forward was fine. My guess it depends on which mount is bad.
I looked, pryed, etc., but could NEVER see a "break" or "tear" in the mount. I finally bought a new set (and upgraded to the Ron Morris adjustables) and the problem went away like turning a light switch.
If you have another set of mounts, or can get your hands on a set, swap them both out.
It may not be the problem....but it sounds very similar to the situation I had, only in reverse.
Ok.... What RPM does the shake start to become noticeable?
First thought is that if it shakes in neutral when you apply the gas, there is no miss, and the engine isn't bucking because of timing, you might have a broken engine mount, bad tune on the engine to make it run rough, or your thrust bearings just took a dump on you.
I had this issue last year and it all boiled down to my thrust bearings in the engine failing. The engine was smooth until gas was applied and RPMs came up. It would do it in neutral and while driving. After running through all the possibilities, I took the tranny off the bell housing and started the engine to make sure it wasn't something in the tranny. It wasn't. Removed the starter, bell housing, and then put my hand on the clutch and noticed the clutched moved in towards the front of the engine by 1/4 - 1/2" and could move the whole clutch/fly wheel in and out of the engine while connected to the crank and of course, the balancer would move with them. This = new engine.
So it begins. You will get a lot of answers from this forum on what it could be, but you need to take this info and check each one..... Who knows, it could be something that none of us have experienced. Please keep us tuned in to what you figure out!
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