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clutch slip


 
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Phil22
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PostPosted: Sun Feb 17, 2019 23:17    Post subject: clutch slip Reply with quote

Hmm first post and I have a problem....! The car is a V80 3.2 auto, SWB, had it about a month. The previous owner used it as a tow truck mainly.

I've found that when I push down on the accelerator, the engine speed rises but there's a bit of a lag before the vehicle starts to accelerate. This happens whether it's in auto mode of the 'sports' mode. Also fuel consumption is around 25mpg with me being pretty gentle.

I've not had a slippy clutch on a car before but this is what it seems to be like. Could it be anything else? Any ideas before I see how much the local garage charge to replace the clutch?

Cheers
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Simon_W
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PostPosted: Sun Feb 17, 2019 23:37    Post subject: Reply with quote

Clutch? Which clutch? It's an automatic gearbox!  

If there's slippage, first thing to check is the condition and level of the gearbox fluid (ATF). Loads of posts on here about how to do it. Just have a search.
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PostPosted: Tue Feb 19, 2019 3:24    Post subject: Reply with quote

They do contain clutches Simon and its these wearing which contaminate the ATF.
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JPB
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PostPosted: Tue Feb 19, 2019 9:55    Post subject: Reply with quote

This could be a clutch fault, since the clutch plates in an automatic transmission do most of the work. Some clutch papers are easy to get at, some less so, but once they're away, the rest of the unit isn't far behind and the brake bands will benefit from being addressed at the same time if you're removing the clutch drums and replacing worn linings.
Clutches would be my first thought when dealing with a heavy car that's done lots of towing, but first port of call is to check the fluid level (engine running, move the selector through from Park, right around to 1st, then back to park, pausing between Drive, neutral, reverse and back into park, then checking the level on the dipstick with engine idling and ideally at working temperature), so after a run is best.
Smell the fluid, does it smell burnt? This is mostly caused by the clutch linings and brake bands having started to deteriorate as a result of wear and old age. The fluid can safely be darker than it is when new and fresh, but shouldn't feel gritty between the fingertips as that's indicative of mechanical wear. If the fluid goes clear when rubbed between fingertips, then it's ok to go on using it, if it's so filthy that it leaves dirt behind on your skin then it's well overdue for a drop and replace job.
If the transmission has a known history, and has seen fluid changes in line with mechanical sympathy, then a fluid change can, occasionally, get back some traction in worn units, but if it's actually slipping, this begins the serious wear to what's left of the clutch linings and it's probably time to get the unit seen to by a suitably experienced person. Overhauling an auto 'box is a possibly DIY operation if you have the skills and can work in near sterile conditions, but otherwise, put it in to a specialist. There is (or was, it's a long time since I've been that far up the road) a guy in Forres who rebuilds automatic transmission units and is well thought of in the trade, he's pre-internet and has never had web presence though, so check your yellow pages to see whether he's still working.

Here's a picture from the internet to show what a typical clutch assembly looks like:



[img]https://proxy.duckduckgo.com/iu/?u=https%3A%2F%2Fi.ytimg.com%2Fvi%2FwDUFy_i0TWI%2Fhqdefault.jpg[/img]
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Phil22
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PostPosted: Tue Feb 19, 2019 10:08    Post subject: Reply with quote

[quote="JPB"]This could be a clutch fault, since the clutch plates in an automatic transmission do most of the work. Some clutch papers are easy to get at, some less so, but once they're away, the rest of the unit isn't far behind and the brake bands will benefit from being addressed at the same time if you're removing the clutch drums and replacing worn linings.
Clutches would be my first thought when dealing with a heavy car that's done lots of towing, but first port of call is to check the fluid level (engine running, move the selector through from Park, right around to 1st, then back to park, pausing between Drive, neutral, reverse and back into park, then checking the level on the dipstick with engine idling and ideally at working temperature), so after a run is best.
Smell the fluid, does it smell burnt? This is mostly caused by the clutch linings and brake bands having started to deteriorate as a result of wear and old age. The fluid can safely be darker than it is when new and fresh, but shouldn't feel gritty between the fingertips as that's indicative of mechanical wear. If the fluid goes clear when rubbed between fingertips, then it's ok to go on using it, if it's so filthy that it leaves dirt behind on your skin then it's well overdue for a drop and replace job.
If the transmission has a known history, and has seen fluid changes in line with mechanical sympathy, then a fluid change can, occasionally, get back some traction in worn units, but if it's actually slipping, this begins the serious wear to what's left of the clutch linings and it's probably time to get the unit seen to by a suitably experienced person. Overhauling an auto 'box is a possibly DIY operation if you have the skills and can work in near sterile conditions, but otherwise, put it in to a specialist. There is (or was, it's a long time since I've been that far up the road) a guy in Forres who rebuilds automatic transmission units and is well thought of in the trade, he's pre-internet and has never had web presence though, so check your yellow pages to see whether he's still working.

Here's a picture from the internet to show what a typical clutch assembly looks like:



Thanks for your reply.

I no longer have the facilities to consider a clutch repair operation.  What you say makes sense from experience on motorbikes - once there's noticeable slip, it's time to take a look inside.

If you could remember the name of (or any hints to help find) the workshop in forres, that would be very helpful - I'm afraid most repair places near here don't inspire much faith.
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JPB
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PostPosted: Tue Feb 19, 2019 10:21    Post subject: Reply with quote

The comparison with a bike clutch is a good one as both are wet clutches and the parts do look similar. I've emailed some of my friends from up that way to see whether anyone can come up with contact details for the guy in Forres, I've also asked the question on the other three car fora to which I post.
Idea Is Aberdeen too far to consider travelling for a transmission overhaul? If so, then the following information may be pointless, but these folk did a great job of sorting an old BW65 transmission for one of my Dolomite owning acquaintances, so I'll post just in case:

Name: Aberdeen Automatic Transmission Services

Telephone number: 01224 626688

Business address: 25 Charles Street Aberdeen AB25 3TU
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Phil22
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Joined: 29 Jan 2019
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Location: near Inverness

PostPosted: Tue Feb 19, 2019 10:53    Post subject: Reply with quote

JPB wrote:
The comparison with a bike clutch is a good one as both are wet clutches and the parts do look similar. I've emailed some of my friends from up that way to see whether anyone can come up with contact details for the guy in Forres, I've also asked the question on the other three car fora to which I post.
Idea Is Aberdeen too far to consider travelling for a transmission overhaul? If so, then the following information may be pointless, but these folk did a great job of sorting an old BW65 transmission for one of my Dolomite owning acquaintances, so I'll post just in case:

Name: Aberdeen Automatic Transmission Services

Telephone number: 01224 626688

Business address: 25 Charles Street Aberdeen AB25 3TU


Aberdeen is about 100 miles from here so is a wee bit far unfortunately. I'll give them a call though as they may be able to recommend somewhere closer.  And I'll be grateful for any leads re the guy in Forres too.  Your help is appreciated.
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assassin
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PostPosted: Fri Feb 22, 2019 3:47    Post subject: Reply with quote

One other consideration is, does it have the correct ATF in it or has it been replaced at some time with something different as Dexron II was the most popular used ATF which is the incorrect ATF, or has the ATF been topped up with incorrect ATF at some time as this will kill clutches when heavily laden.
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