RPM go up
Created by: Rainy
Orig. Posting Date | User Name | Edit Date |
Nov 22, 2020 08:55AM | Dan Moffet | |
Nov 21, 2020 03:08PM | onetim | |
Nov 21, 2020 12:22PM | Rainy | |
Nov 21, 2020 09:52AM | Dan Moffet | |
Nov 21, 2020 08:50AM | onetim | |
Nov 19, 2020 03:11PM | Rainy |
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Don't touch the carb(s) - that will take you farther away from the solution and only generate more problems. (The primary connection between the carb and the clutch is the driver!)
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"Hang on a minute lads....I've got a great idea."
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Follow through with the tests Dan recommends. carburetors, 1or2? Would not need be replaced, but I guess could be out of tune to the point of being something to adjust with a proper manual as a guide.
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Thanks to onetim,Dan
if worst .replace carburetors can solve it?
if worst .replace carburetors can solve it?
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Quote:
Originally Posted by onetim
If this can be repeated with the car stopped, have a helper push the clutch, while you look for the problem. Possible cable routing/engine movement.
I agree to test the clutch with the engine running but in neutral to see if it clutch or throttle related. With the engine running in neutral and foot off the clutch pedal, observe the idle speed - should be somewhere around 800 to 1000 rpm. Then depress the pedal and see if the rpms go up or down. If the gear train is in good condition, the rpms might go down a small amount when the clutch is applying pressure to the crank thrust bearings. If the rpms do go up, there may be excessive drag in the drop gears and/or first motion shaft in the transmission.
Next test is with transmission in neutral, foot off the clutch and the engine idling. Rev the engine using the accelerator pedal. Lift your foot off the gas quickly. Does the engine drop to idle or does it take time to come down?
Next test is a road test. Drive the car at the speed and gear you have the problem at. Depress and hold the clutch pedal all the way down (coasting along). Don't shift gears - leave it in the gear you were running at. Take your foot completely off the accelerator. Do the rpms go up? Do they settle back to idle? How long does it take? Repeat this test in different gears.
Next test on the road is to shift gears up or down one (as when you get the problem). Do the rpms change when you select a different gear while keeping the clutch pedal depressed?
These last two tests might identify drag in the drop gear train or transmission.
.
"Hang on a minute lads....I've got a great idea."
Total posts: 1007
Last post: Jul 19, 2022 Member since:Jul 24, 2014
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If this can be repeated with the car stopped, have a helper push the clutch, while you look for the problem. Possible cable routing/engine movement.
Total posts: 2
Last post: Nov 21, 2020 Member since:May 20, 2019
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Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
87 cooper
when shift gear ,step on clutch ,RPM go up
had replace throttle cable but can’t solve this problem
please
Thanks
when shift gear ,step on clutch ,RPM go up
had replace throttle cable but can’t solve this problem
please
Thanks