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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Noise at cold startViews : 2852 Replies : 26Users Viewing This Thread : |
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Sep 11th, 2018, 14:40 | #1 |
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Noise at cold start
Hello!
I have this noise at cold start. Shorter noise at warm start. Does anyone recognize the noise below and what it could be related to? https://youtu.be/aX1jngcvKN0 |
Sep 14th, 2018, 22:53 | #2 |
Yoorkshireman
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Probably dirt or rust on the bendix stopping the pinion returning home fully and it’s catching on the flywheel.... remove starter motor, clean mechanism thoroughly and lightly oil, should be ok. Hopefully the picture makes some sense of this. On the Volvo starter motor the mechanism is covered by a shroud but can still be accessed. Had it on an Audi a few years ago.
Last edited by Sahodgson; Sep 14th, 2018 at 22:56. |
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Sep 14th, 2018, 23:34 | #3 |
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Sahodgson's suggestion is worth following up on. Depending on what year your car is, it may not have a "bendix" but a solenoid that energises when you turn the key to "crank" and throws a gear forward to engage with the the flywheel ring gear which then turns the engine over. When you release the key the solenoid should power off and the gear should retract back away from the teeth of the ring gear. If it is sticking, you will get that sort of noise because the starter gears teeth will rub on the flywheel ring gear teeth. This will create vibration which helps the sticky gear eventually retract.
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Sep 15th, 2018, 00:38 | #4 |
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All automotive staters have a Bendix and a Solenoid, Study harder. Like Sahodgson says the Bendix can get dirty not fully retract.
http://www.autoelectro.co.uk/how-it-...starter-motors Last edited by Thommykent; Sep 15th, 2018 at 01:48. Reason: just because |
Sep 15th, 2018, 08:04 | #5 | |
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Quote:
The term Bendix refers to the helical thread that the drive cog would be threaded on to, the sudden inertia of the motor starting would wind the cog along the shaft and hence engage it with the flywheel teeth. 99.9% of starter motors on modern cars do not have a Bendix mechanism, instead they have a pre-engagement solenoid (which also operates the electrical contacts). Whilst this can suffer the same problems - ie become contaminated and be slow to or not retract - it’s not as common in the old days but it’s still a good place to start. Just a note to the good - I see you’re a junior member - this forum is about helping people with their cars, not scoring points off each other.
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Sep 15th, 2018, 09:28 | #6 |
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Terminology correctness aside, I find a mechanics stethoscope to be the most helpful when tracing noises.
https://www.clarketools.net/clarke-c...yABEgIDOPD_BwE With a myriad of components that can or could groan upon starting it may help in identifying the culprit. Starter motor on a manual transmission car is subject to clutch dust clogging said Bendix and its bearing. Less of a problem I surmise on a automatic transmission car but no doubt the age/mileage of components will play a part. There is also the alternator pulley clutch which is known to make noise when failing. On my own vehicle the headlight self-levelling servo is somewhat noisy. I've listened to the YouTube clip and it could well be the starter pinion gear not returning to rest but equally it could be a dry bearing that squeals when first run. ....so it's a two person job, one using a listening device as suggested and t'other starting it up. Good luck & please do let us know what you found. |
Sep 15th, 2018, 16:11 | #7 | |
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Quote:
https://www.howacarworks.com/basics/...g-system-works Last edited by Thommykent; Sep 15th, 2018 at 16:44. Reason: spell |
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Sep 15th, 2018, 21:34 | #8 | |
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Quote:
Whilst there is a similar thread on a pre-engaged starter, it's not a bendix mechanism, it's there to ensure that the pinion rotates a few degrees to ensure that it moves into mesh with the flywheel gear. It does not affect the advancement or retraction of the pinion. And it isn't going to be related to the OP's problem... as explained here: https://www.youtube.com/watch?v=Sf6LqYBLljs And I made no comment on my own membership...
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Sep 15th, 2018, 22:08 | #9 | |
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Sep 15th, 2018, 22:26 | #10 | |
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Quote:
I think maybe the picture that Thommykent posted use the term Bendix alongside the term "Pinion" on the diagram to help older people identify with it. As you scroll down the page they go on to discuss it further. They only use the term "pinion" in the explanation of the parts and how they work. Thanks, Ampy. |
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