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03-03-2021, 11:36 AM | #1 |
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Counterbalanced Crank
Is there a way to determine if a car's engine has a counterbalanced crankshaft without dropping the oil pan? My thought is if the engine is run at a certain speed an "excessive" vibration will show up. Is there another way?
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03-03-2021, 11:46 AM | #2 |
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Re: Counterbalanced Crank
Remove the crankcase breather pipe on the driver's side of the engine and look inside.
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03-03-2021, 11:53 AM | #3 |
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Re: Counterbalanced Crank
Thanks Bob. I am exploring a way that, if I did not own the car, I could determine if the engine was rebuilt with a counterbalanced crankshaft.
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03-03-2021, 12:02 PM | #4 | |
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Re: Counterbalanced Crank
Quote:
JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
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03-03-2021, 01:11 PM | #5 | |
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Re: Counterbalanced Crank
Quote:
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03-03-2021, 01:56 PM | #6 |
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Counterbalanced Crank
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Update: Nope Last edited by alexiskai; 03-03-2021 at 05:45 PM. |
03-03-2021, 07:51 PM | #7 |
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Re: Counterbalanced Crank
Simple. Get a guy in your club to drive your car that has had his car without a counterweighted crank, and then got his engine rebuilt with one. A drive down the road at 50MPH, then take your foot off the gas, and reapply. The vibrations in the steering wheel, and the rear view mirror, plus his experience will tell you in about 2 minutes.
Last edited by Gene F; 03-03-2021 at 07:57 PM. |
03-04-2021, 08:18 PM | #8 |
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Re: Counterbalanced Crank
slightly off subject.
I bought a set of counterweights about 20 years ago. I'd like to know if i can just bolt them on to the crank and go with that?? There are no instructions with this item. Tks, Jerbo |
03-06-2021, 06:10 PM | #9 | |
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Re: Counterbalanced Crank
Quote:
Press on weight application is quite involved and has been covered in other posts in the past. |
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03-06-2021, 06:52 PM | #10 |
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Re: Counterbalanced Crank
Pete is right. He's not being rude when he tells you this. Sometimes we try to save people from pain later, and some folks take it wrong.
One other thing. When the journals are machined they should not join the bosses at 90 degrees. There should be a shoulder there (a curve up - I forget the technical name) otherwise the crank is succeptable to snap down the road (did you catch that funny LOL). I have experienced this, and it is no fun. Just because you hire a big name shop, and pay a big price is no guarantee the work will be done right. |
03-07-2021, 12:34 AM | #11 |
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Re: Counterbalanced Crank
Might want to magnaflux the crank after installation of weights too. I wound up with 2 cracks after a press on installation by a reputable machinist. Things can go sideways anytime.
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03-07-2021, 07:40 AM | #12 |
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Re: Counterbalanced Crank
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03-08-2021, 02:01 PM | #13 | |
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Re: Counterbalanced Crank
Quote:
BTW.... The oil fill tube is removable. I would remove that tube to view crankcase area... short of removing pan. Last edited by hardtimes; 03-08-2021 at 02:07 PM. Reason: Zzzzzzz |
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03-08-2021, 02:16 PM | #14 |
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Re: Counterbalanced Crank
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03-09-2021, 08:29 AM | #15 |
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Re: Counterbalanced Crank
I have found that the oil breather pipes are extremely difficult to remove from Model B engines, but no so on Model A engines.
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03-10-2021, 01:50 AM | #16 | |
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Re: Counterbalanced Crank
Quote:
I made a tool/device. The idea was to make it grab the pipe using full circumference. Upward pressure using hammer strokes /tapping on bottom... while twisting ‘tool’ handle... back and forth. Wasn’t easy, but not in hurry took plenty of time. Tube came out... paint was scratched. This was a B engine tube. Alex, I took my tube out because it was filled with crud and HAD to be cleaned. If it was not , I would have spray painted it in place. Last edited by hardtimes; 03-10-2021 at 02:01 AM. Reason: Xxxxxxx |
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