The engine vibrates both warm and cold . With the clutch in on the highway you can still feel the vibrations . The vibrations get stronger as the rpms increase. Now that i think about it , the engine was harder to turn by hand as the pistons approached the top .Yes, is it related to engine rpm or instead road speed? Does it change whether sitting still or driving?
If the rods are in backwards you shouldn't have been able to turn it over, they bind. Although I took apart a 750 engine once with the rods backwards and all the pistons were worn sideways.
The offsets of the rods do require that they be installed in a particular way. Your manual (you do have a manual?) will show this. But as Andrew wrote, if one or more rods were installed incorrectly, the engine would bind as you tried to rotate it.If I put the piston rods in backwards could this be the cause? Is this even possible?
Found the problem!!!! I installed at least one piston rod in the wrong orientation. Pulled the lower pan and looked at pistons#1and 2. They were both facing the same way, so at least one was installed incorrectly.If you can feel the vibration with the car out of gear, have someone run the car at different RPMs while you feel the various areas of the engine, clutch, & trans. Best to do this on a lift. But not one that lets the rear axle droop if you are thinking it might be the drive shaft.
Look also for any contact of any part of the driveline or headers to the chassis.
I went back and looked at the photos I took today with the oil pan off. I am not convinced that both visible piston rods are facing the same direction. Just getting more confused. Tomorrow I will turn the engine by hand and see if it is binding more in any portion of the rotation .This won’t tell me for sure if the puston rods are installed wrong, but it will tell me if something is going on in the engine .Found the problem!!!! I installed at least one piston rod in the wrong orientation. Pulled the lower pan and looked at pistons#1and 2. They were both facing the same way, so at least one was installed incorrectly.
I was very careful when I installed them.. I am still having trouble seeing which way they are offset which caused the mistake.
Now , I think the offset is in the direction opposite the big lip on the piston rod nig side . Below is a photo I found on another post in this forum . It shows the big lip facing the middle between #1 and #2 and facing the middle between #3and #4 .
I think I got confused and probably put the large lip facing out on #1 and # 4 which is incorrect.
Yes the engine is running . Actually very well... just vibrating .. fixing the orientation to match the photo I believe will solve the vibration proplem
View attachment 1681570
Unfortunately, thst is not my picture, but a photo from another post showing the correct orientation.In your first pic all rods are correctly positioned.
Rods 1 and 4 face outward, 2 and 3 face the middle(towards each other( as you show..
Yes, maybe. If the flywheel and pressure plate were balanced together and then assembled in a different orientation, that could throw things off. Each should be balanced separately OR balanced together and marked so they are always assembled the same way.the pressure plate and the clutch disk were not changed. Maybe I created the problem here.
Without knowing for sure what is wrong, I don't have a better idea. But don't be surprised if you go though the balancing process and find no issue. Troubleshooting this sort of problem often goes that way.The only thing I can think of now is to pull the engine. Check the balance on the flywheel and pressure plate, Then the pistons, and if necessary, finally the crank.