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Old 01-30-2019, 06:24 PM   #1
xactorocker
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Exclamation Brand New Clutch Slipping m46

hey i installed a new sachs clutch in my 240 with the m46 about a month ago. and it was slipping in second when i got it in i thought this was the break in period. it seemed to have gone away but now its back and its happening in first second and third. anyone know causes this and what do i need to fix it. i have one second question i am supposed to go camping in a couple days and was going to camp in the volvo. will driving with a new slipping clutch destroy it.
-thanks
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Old 01-30-2019, 06:28 PM   #2
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Was the flywheel surfaced before the new disc? New PP? If so odds are it wasn't cleaned well before and during install... or a rear main or valve cover gasket is leaking down in there and making a mess.

I would not drive a car with a slippy clutch in all forward gears
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Old 01-30-2019, 06:43 PM   #3
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it has a new pressure plate but did not resurface the flywheel i have heard and sanded them before but if that something different i did nothing this time to the flywheel.
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Old 01-30-2019, 08:14 PM   #4
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What did you adjust the clutch pedal free play to? If it is too tight it can make the clutch slip. You adjust it under the car on the throwout bearing arm. It is supposed to be about 2-4mm. I like it to the loose side if possible.

Last edited by dl242gt; 01-30-2019 at 08:16 PM.. Reason: add comment
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Old 01-30-2019, 08:22 PM   #5
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Yeah I tried all that today because I wanted to make sure it was the flywheel but will the clutch be worn quickly if I drive with the clutch slipping?
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Old 01-30-2019, 08:36 PM   #6
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Yes, it can be damaged if you drive any long distance with a slipping clutch. Slipping makes heat which will only continue to make the slipping worse.

So what was the clutch free play adjustment? Loose?
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Old 01-30-2019, 08:40 PM   #7
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Did you clean the pressure plate surface, clutch disk, and flywheel with brake clean before installing it?

Slapping a new disk onto a used, un-sanded flywheel is pretty sketch.
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Old 01-30-2019, 09:03 PM   #8
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Yeah we are going to take it all back apart clean it and sand the fly wheel thanks for the help.
So what I need to do is clean everything and sand the flywheel? Thanks
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Old 01-30-2019, 10:46 PM   #9
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Best method to avoid problems is to have the flywheel surfaced on a surface grinder instead of a lathe. How are you going to sand it?


Answer to your question: Yes driving with a slipping clutch will prematurely wear out the clutch disc and likely damage the flywheel and PP (heat spotting).
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Old 01-30-2019, 10:51 PM   #10
2turbotoys
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Not sand the flywheel, have it refinished. Not to give you a hard time but it's a lot easier to read if you use punctuation.
Example:
I helped my uncle jack off a horse.
I helped my uncle jack, off a horse.
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Old 01-30-2019, 11:33 PM   #11
carver
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Quote:
Originally Posted by 2turbotoys View Post
have it refinished.
As in take it to a machine shop. It's not an expensive job to have done right.
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Old 01-31-2019, 12:33 AM   #12
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If you absolutely can't deal with paying for surfacing at a machine shop. I have used the round hone pads for brake discs on the flywheel surface to make it better for a new clutch disc. it's a velcro backed pad for your drill that will make a proper surface for brake pads and a clutch disc is a friction surface like brakes. Worked well for me. Most good autoparts stores have them. A machine shop is best though.
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Old 01-31-2019, 12:39 AM   #13
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Quote:
Originally Posted by dl242gt View Post
If you absolutely can't deal with paying for surfacing at a machine shop. I have used the round hone pads for brake discs on the flywheel surface to make it better for a new clutch disc. it's a velcro backed pad for your drill that will make a proper surface for brake pads and a clutch disc is a friction surface like brakes. Worked well for me. Most good autoparts stores have them. A machine shop is best though.
Thank you i am going to try this technique. It just seems like such a hard job getting the flywheel off because of the high torque rating, and the needing to replace all of the seals behind it. Thank you for the help
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Old 01-31-2019, 12:53 AM   #14
dl242gt
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Only the crank rear main seal is behind the flywheel. So you would want to replace that with a good one like the Volvo one.
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Old 01-31-2019, 02:11 AM   #15
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The cable is probably misadjusted. You may have already fried it.
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Old 01-31-2019, 09:47 AM   #16
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i just ordered a new clutch cable bushing mine was pretty much deteriorated maybe that will help. So i guess i will see what it looks like when i take it off, hope its not fried. I haven't drove more than say 15 miles at a time.
I am going to just park the car to not cause more damage until i get a chance to rip it apart.
thank you all.
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Old 01-31-2019, 12:13 PM   #17
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The worn cable bushing could certainly be part of the problem.

Replace it before you do anything else, adjust the clutch to spec, then see what you've got.
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