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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 1, 2023, 12:17 PM
Post #26 of 31
(660 views)
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Re: Montero Clutch
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OMG - that helps HT! That can't take losing metal without any more about it. Would be really hack to lower those stubs to match again.
This is new only never mind TSBs is a design that just isn't tolerant explains a lot, Tom
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tnora
User
Apr 1, 2023, 3:19 PM
Post #27 of 31
(650 views)
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Re: Montero Clutch
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Hammer Time,
Thanks for that TSB. I will show that to my repair shop and ask him how much total material was removed from the two resurfacing's.
I asked him this, before this second repair, if the Montero stock flywheel could take another resurfacing and if it would be out of spec with the pressure plate and he said it would still be in spec. I'll revisit this with him, Monday. I've driven 25 miles since picking it up.
In regards what does break in mean? I'm not a mechanic, so I don't know. All the info that I have read is that a break in is required for warranty coverage. My mechanic discovered this when he called the clutch plate manufacturer for warranty replacement for my repair. He didn't tell them that I drove my vehicle a 100 mile round trip 3 times, with a 5000 foot elevation change within the first 500 miles from the first clutch rebuild. This knowledge would have disqualified me for the manufacture's warranty. My mechanic was looking out for me. I think he was of the same mindset as you, that new clutches do not need a break in period. The only information to best answer your question is what the BMW TSB listed stated regarding clutch break in: "This procedure helps to create a carbon layer between lining and metal friction surface which generates the required coefficient of friction."
I'm quoting the BMW TSB below, which I hope is within the forums rules.
Tom, this BMW TSB is probably new to you. This clutch break in issue is new to me and many mechanics, since my mechanic wasn't aware of it.
Since Hammer Times discovery of the Montero TSB resurfacing tolerances for my flywheel, I'm leaning towards that is the problem with the premature failure of the first replacement. I might have to have my mechanic drop the transmission again and replace my flywheel. I'm not sure if I should offer paying for the flywheel or just ask him to replace it with no charge to me because I wouldn't be in this position if he had read the Montero flywheel TSB. What would you do if you were in my mechanic's shoes?
Here's the BMW TSB for reference.
21 00 ... Breaking in SAC clutch
Break in SAC clutches moderately to ensure correct operation.
Caution!
Fast sports driving maneuvers destroy new clutches! Such maneuvers include:
• Driving maneuvers with high speed differentials
• Overlapping gearshifts with high speed differentials (slipping clutch)
• Very high starting speeds (e.g. when driving onto a transporter)
Comply with the following procedure when breaking in the new clutch:
- Break in friction linings with light to medium loads (observe breaking-in program)
- Normal driving with many "moderate" gearshifts
- Starting speeds on the level up to approx. 2000 rpm
- Specific breaking-in program on gentle gradients
- Starting speeds on a medium gradient up to approx. 2500 rpm (e.g. when driving onto a transporter)
This procedure helps to create a carbon layer between lining and metal friction surface which generates the required coefficient of friction.
Breaking-in program:
(specially for M5 and Z8)
• At approx. 30 km on roads • Shift through gears often
• Upshifts
• Downshifts at 2000 rpm
• Upshifts and downshifts
• 3 to 5 times starting on gentle gradient (up to approx.
12 %)
Starting speed max. 2000 rpm 1>2>3>4>5
5>4>3>2>1
at 3500-4000 rpm
Starting speed max. 2500 rpm
Note:
Experience shows that approx. 800 to 1000 gearshifts are required for an optimally broken-in lining when a car is driven "normally" (advise customer).
RA Breaking in SAC clutch BMW AG - TIS 19.10.2003 09:18 Issue status (12/2002) Valid only until next CD is issued Copyright Page - 1 -
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 1, 2023, 7:41 PM
Post #29 of 31
(631 views)
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Re: Montero Clutch
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IMO all the "fine" print is just a feeble attempt to CYA the makers of cars - things in general. It's there to always be able to blame someone else for things that didn't work out to blame the other.
Go back and look at the pic of the flywheel posted by Hammer. Those drill marks are to balance it.
Ask why if techno making of things needs that at all? It's not perfect new is why.
Days of selling wear items like this (countless other things) oversized to work again another cycle long gone for the throw it all out mind-set.
In short this exact clutch just wasn't made to be tolerant of normal wear + the use it gets IMO outside of norms for one design to fit all possible situations this one isn't it.
Expect this job needing doing all over again or finally give in and find some other vehicle that might deal with those conditions better right now none come to mind except maybe a WWII Jeep - kinda kidding.....
Tom
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tnora
User
May 31, 2023, 1:30 PM
Post #30 of 31
(531 views)
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Re: Montero Clutch
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Update on my montero clutch. I’m leaning to replace my flywheel. I’m 250 city miles out of 500, into my break in period on this two month old clutch plate but I smell clutch plate wear. The problem I’m running into is finding a new flywheel. They are still available but I have to order it through the Mitsubishi dealer who orders it directly from the Japanese factory. It’s a 4 month wait. I’m amazed how 20+ year old vehicles are serviced these days when parts are not available?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 31, 2023, 1:40 PM
Post #31 of 31
(525 views)
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Re: Montero Clutch
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There are parts shortages everywhere. Shops are having to wait for most everything they order these days.
I checked WorldPac and a few local outlets and nothing available.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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