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engine
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-- 09-15-2017 @ 6:13 AM
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I have a 1941 Ford Station Wagon that has had a vibration in the motor. I just had the engine rebuilt and it still has this vibration. The clutch is a 11" and I am wondering if being that size verses a 9"or 10" if in fact that could cause the problem. I know that trucks had the 11" but the car from what I understand did not. It idles fine but the increase in rpm causes the vibration. If I put my hand on the floor panel I can feel the vibration near the clutch area. I have had the clutch and pressure plate balanced and it is with in 17 grams . The crankshaft was also balanced during the rebuild. New valves,springs, piston rings. Any idea would be great.
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shogun1940
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-- 09-15-2017 @ 6:54 AM
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Does the vibration change with the clutch pedal depressed?
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carcrazy
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-- 09-15-2017 @ 7:37 AM
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On your 1941 Ford the fan is mounted to the nose of the crankshaft. Did you have the fan balanced when the crankshaft was done? Your fan may be causing the vibration. Does the vibration lessen when the engine speed is increased?
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engine
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-- 09-15-2017 @ 8:49 AM
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I should have also said it has a 59 block, I took the fan off to see if it had made a difference, it did not. The vibration starts about 1200 rpm I would say and continue on up . I have driven it up to 60 mph at it is quite notable to the point that the steering wheel shakes. The vibration is there if the car is sitting still or driving. If you run first gear up and second gear the higher rpm cause the vibration.
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engine
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-- 09-15-2017 @ 8:51 AM
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The vibration doesn't change with the clutch pedal depressed or let out
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cliftford
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-- 09-15-2017 @ 12:39 PM
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Of course an 11" clutch is over kill,but it shouldn't cause that problem. I'm inclined to think somebody goofed in the balancing process.
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carcrazy
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-- 09-15-2017 @ 12:51 PM
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Maybe the generator pulley or one of the waterpump pulleys is not concentric or is out of round. Also any of the bearings in the generator or water pumps may be bad. The armature in the generator may be dragging on the field coils. Do you hear any unusual noise when the vibration occurs or is it only perceived as a shaking?
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supereal
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-- 09-15-2017 @ 1:31 PM
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Remove the belt and see if that eliminates the problem. If not, it is time to contact the rebuilder. To properly balance a crankshaft, "bob weights" equal to the piston and rods must be attached at the time of balancing, otherwise just checking the bare crank is not balancing .
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engine
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-- 09-15-2017 @ 1:55 PM
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I had taken the belt off as well as the fan , the engine shook more before it was rebuilt but it still has the vibration. I will be taking the car to the engine rebuilder next week and have him see what he thinks. I will ask him about the bob weight, good to know. I just thought that maybe the 11" clutch might have caused it but the trucks had it also with the same engine. Thanks for all your thoughts. The generators ok.
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carcrazy
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-- 09-15-2017 @ 8:19 PM
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Are the pins offset in the pistons of your engine? If so, one or more of the pistons may be installed incorrectly.
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engine
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-- 09-16-2017 @ 7:35 AM
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I have no idea, the shop that did the rebuilding of the engine is well known to do flat heads. As I stated before the vibration is felt in the clutch area. The flywheel is for the 11" clutch that is why it has one. It was balanced as well. I will be taking the car over next week and see if they can determine the problem. Thanks
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engine
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-- 09-18-2017 @ 10:49 AM
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I just got back from the engine rebuilder and he thinks that the vibration is in the engine mounts. You can feel it in the floor and seat, steering wheel. Here is my next question, the rear transmission mount is the steel type that mounts to the back of the transmission and then threw the mounts to the frame. I checked to see if the 36 transmission mount would work for the 41 but was told it would not. I have put in new mounts from Drake .Some how I think that I need to isolate this at the back transmission better. Has anyone ever had this problem?
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supereal
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-- 09-19-2017 @ 10:23 AM
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The vibration you describe can't be generated by the mounts alone. They will transmit vibration caused by the driveline, usually from the engine. If the vibration did't change with the belt off, the problem seems to be related to internal rotating engine parts. Often we see problems in flatheads at our shop caused by the rebuilder's evident lack of information regarding tolerances which certainly differ from modern engines.
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engine
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-- 09-21-2017 @ 5:29 AM
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The engine rebuilder has done many of these engines from what I know. I had him do my truck engine as well. I am getting some who think that the flywheel is the problem. I am going to have to pull out the engine at this point to try to get it corrected. Thanks for your help.
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engine
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-- 09-21-2017 @ 5:34 AM
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I did ask if he had used the bob weights and he said that he had. Spun up the crank shaft, flywheel, and pressure plate to 4500 rpm and it was good. Pistons and rods were also weighed.
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carcrazy
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-- 09-21-2017 @ 6:10 AM
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Balancing the clutch and flywheel with the clutch disc in place could be the cause of your problem if the clutch disc wasn't centered on the flywheel at the time of the balancing operation.
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engine
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-- 09-26-2017 @ 1:53 PM
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Well I have good news about the vibration that I was having trouble with. I loosened up the bolts for the transmission mounts and put a jack under the transmission and raised it up off of the frame and started the engine. Vibration gone, the new mounts that I have are a hard rubber and don't balloon out like the engine mounts. I will be in search of softer rubber ones. Does anyone know who may supply these? It seemed that the hard rubber just transferred the vibration to the frame. Thanks for your support.
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engine
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-- 12-23-2017 @ 3:23 PM
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Here is the update on my vibration problem. I got another flywheel from Tom O and a new clutch and had them balanced. I pulled the engine and put on the new flywheel and clutch and reinstalled the engine. I started it up and the vibration is gone. I suspect that the flywheel was the problem at this point all along. I am just glad that this has finally been resolved. Thanks to everyone
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