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#374651 - 08/31/16 07:30 PM 1941 Chev Special Deluxe Engine Vibration
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
I have an engine vibration and I would really appreciate your input on a solution. My 41 Chev has a 1952 or 1953 engine with a 1961 distributor otherwise everything is stock.
So at idle,tranny in neutral, clutch in or out I have a vibration in the floor and it gets worse at higher revs. It has been doing this since I bought the car 1 year ago. While driving it lessens at 60 mph.
It was suggested to me by a knowlegable old car mechanic it might be a flywheel problem. According to online info it could have 1 of 2 flywheels: a 6 bolt mounting pattern
or a 9 bolt mounting pattern
Thank you and looking forward to your suggestions.
John

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The Filling Station 1937-42
#374653 - 08/31/16 07:56 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
Chev Nut Offline




Registered: 01/08/02
Posts: 24824
Loc: West Allis,Wi.
Could be motor mounts or exhaust hangers.
Flywheel or pressure plate out of balcnce. Dosen't matter which flywheel it has.
You could try rotating the pressure plate to flywheel mounting or placing a weight on a flywheel bolt, one at a time and see if it makes a difference. This could be done without removing any major parts.
_________________________
Chevgene

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#374654 - 08/31/16 08:17 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Ok I'll check the motor mounts, exhaust system is new. What kind a weight would you attach to the flywheel bolt?

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#374666 - 09/01/16 04:42 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
tonyw Offline




Registered: 05/23/02
Posts: 4139
Loc: Goulburn Australia
If you try adding weights I would not put more than 15 grams attached under a clutch cover bolt. Run the engine at not much more than idle and compare the vibration, if that makes no difference move the weight to the next bolt.
Tony
_________________________
1938 1/2 ton Hope to drive it before I retire

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#374689 - 09/01/16 08:52 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: tonyw]
old216 Offline

1500

Registered: 09/15/02
Posts: 1657
Loc: Bracebridge Ontario,Canada
I am interested in this too because I have a similar problem. Would a couple of washer be a good starting weight?
_________________________
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .

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#374691 - 09/01/16 09:17 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: old216]
Chev Nut Offline




Registered: 01/08/02
Posts: 24824
Loc: West Allis,Wi.
I would begin with a 2 or 3 Oz. wheel weight and figure some way, by bending the clamp, to get it attached to a pressure plate bolt.
_________________________
Chevgene

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#374710 - 09/01/16 05:44 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
I put the car up on wheel stands & checked the motor mount bolts today - they were all tight except for one bolt. Tomorrow I work on the pressure plate/flywheel.
I think the trouble is in the flywheel area. I ran the motor up to vibration speed & set the throttle, crawled under and felt more vibration on the lower bell housing cover than other areas.

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#374723 - 09/02/16 04:59 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
Mike Buller Offline

1500

Registered: 10/11/07
Posts: 1820
Loc: MI, USA, Midland
Hi John,

Because the engine was switched you could have an issue created in the switch. Typically, the flywheel would have had its surface reground and been balanced when the change was made as best practices for the conversion. If you can not find out that this was done then unfortunately, you need to pull the transmission, clutch, pressure plate, and flywheel for confirmation that all are okay.

You can do a SEARCH of our past posts to find directions, but the 41 Manual should be first consulted. This is major surgery so you need to plan accordingly. It is not uncommon for the engine switch to be done by someone with a lack of experience. A lot of us have "been there done that."

Good luck, Mike

P.S. Gene what other places could the vibration be coming from in the engine (harmonic balancer, crankshaft)?
_________________________
Mike 41/77 Chevys

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#374818 - 09/04/16 09:34 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Mike Buller]
41specialdeluxe Offline



Registered: 09/14/09
Posts: 4692
Loc: NC usa
John,

You sure you don't have a plug problem. Seems as though there is no explanation of the vibration going away at 60+ except the revolutions are so fast that the vibration fades.

See about your plugs and wires. At least I would do that before going all in and taking the clutch out. Mercy!

Charlie computer

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#374819 - 09/04/16 09:34 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Mike Buller]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Hello everyone, After reading the manual & inspecting the clutch flywheel I found 2 balance problems.
1)The O marks on the driving lug on the pressure plate and the other on the flange of the cover do not line up.
2) The X marks on the clutch cover and the other on the flywheel do not line up.
The transmission will have to come out to reposition parts so that the the O marks line up but 1st I will try rotating the clutch cover on the flywheel so the X marks line up to see if that makes a difference for now.
Thanks for your support.
John

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#374821 - 09/04/16 10:15 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41specialdeluxe]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Hi Charlie,
I wish it were that easy but no the plugs, wires & cap are new.
Kind of like banging your head against the wall...feels pretty good when you stop.
John

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#374822 - 09/04/16 10:33 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Also does anyone know the torque setting for the 6 bolts - cover to flywheel. The oldcarmanualprojectcm site shows a rated torque capacity of 200ft lbs, but is that for these bolts? Thanks.
John

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#374826 - 09/04/16 01:16 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
Chev Nut Offline




Registered: 01/08/02
Posts: 24824
Loc: West Allis,Wi.
25 to 30 foot pounds
_________________________
Chevgene

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#374842 - 09/05/16 05:15 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
Mike Buller Offline

1500

Registered: 10/11/07
Posts: 1820
Loc: MI, USA, Midland
Hi John,

Here is some help with removing the transmission. First go through your manual for steps, then do a SEARCH using the terms +transmission +removal. For DISPLAY NAME use Mike Buller. Here is one of the posts 41 Transmission Removal.

Yes you will need to remove the front seat and its support system.

Good luck, Mike
_________________________
Mike 41/77 Chevys

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#374884 - 09/05/16 06:50 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Very good results today. I repositioned the pressure plate cover & flywheel so the X's matched up and I feel about 80% less vibration when driving. I had an enjoyable drive to the Bracebridge Cruise Night tonight.
Since the rest of the vibration is minimal I'll just enjoy the car for now and think about taking the transmission out later to line up the O's on the clutch & pressure plate. Thank you everyone for your input.
John

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#374887 - 09/05/16 08:00 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
Chev Nut Offline




Registered: 01/08/02
Posts: 24824
Loc: West Allis,Wi.
Any out of balance vibration can damage the main bearings.
_________________________
Chevgene

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#374943 - 09/06/16 08:18 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Thanks Gene, I probably should line up that driving lug on the pressure plate to the flange on the cover sooner rather than later.
John

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#375279 - 09/12/16 07:36 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
I'm not sure if lining up the O's on the driving lug on the pressure plate to the flange on the cover will solve my vibration problem. This vibration feels like you were running tires with big lugs down a smooth road.
I get A vibration with the car parked, running at about 2,000 rpm, in neutral & clutch OUT.
I get NO vibration with the car parked, running at about 2,000 rpm, in neutral & clutch IN.
What do you think? Thanks guys.
John

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#397896 - 11/07/17 05:16 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Hello everyone, about a month ago I solved the engine vibration problem. I asked a local mechanic to line up the driving lug on the pressure plate to the flange on the cover. The transmission had to come out to access the clutch. It goes down the road quite smoothly now at 60mph. Thanks for you help.

John

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#397903 - 11/07/17 06:09 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
Chev Nut Offline




Registered: 01/08/02
Posts: 24824
Loc: West Allis,Wi.
I have heard of the happening after the clutch has been replaced and more common than you think.
Thanks for letting us know of the result.
_________________________
Chevgene

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#397943 - 11/08/17 01:56 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Chev Nut]
41specialdeluxe Offline



Registered: 09/14/09
Posts: 4692
Loc: NC usa
"Yes you will need to remove the front seat and its support system."

Mike,

Re: Removing the transmission from a 41.

Really? I didn't know that. I've been doing it all wrong all these years. Mercy! Agrin

Charlie computer

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#397964 - 11/08/17 06:06 PM Re: 1941 Chev Special Deluxe Engine Vibration [Re: Mike Buller]
41_Chevy_Coupe Offline

Shade Tree Mechanic

Registered: 06/26/15
Posts: 77
Loc: Ontario, Canada
Hi Mike, sorry being so late responding to your suggestion, if I am removing the transmission. I’ve been very busy this past summer and decided to have a mechanic remove than transmission. He was successful in lining things up and now my Chev runs down the road just the way it should.
On a funny note he said “thankfully we have evolved in how we remove transmissions now”. He was referring to pulling the rear end back to remove the transmission as you probably know. Thanks for you input though.

John

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#397976 - 11/09/17 12:08 AM Re: 1941 Chev Special Deluxe Engine Vibration [Re: 41_Chevy_Coupe]
tonyw Offline




Registered: 05/23/02
Posts: 4139
Loc: Goulburn Australia
John
I agree with your mechanic (so am I), the evolution to the easily removed open drive shaft is a good thing. Having to undo the rear suspension is not always fun.
Tony
_________________________
1938 1/2 ton Hope to drive it before I retire

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