Double declutching & Dual mass clutches.

Submitted: Monday, Mar 31, 2008 at 21:01
ThreadID: 56131 Views:2045 Replies:4 FollowUps:6
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I currently drive an aged care bus, one of two such buses. They are MY 2000 Nissan Civilians 4.2 NA diesels with 5 speed man. gearboxes. My mate has gone thru I think 5 clutches in 166k and I only got to 120k before the dual mass clutch failed ( I didn't see the friction plate) but I think it should have been in reasonable condition. Why? The reason , I double de clutch (heal&toe), he doesn't. I believe the engine transmission is straight from the Patrol and there might be a lesson to be learnt from this.
If you haven't mastered the skill make the effort to perfect it no matter how easy the clutch and gear box are to use..the benefits are infinite plate life particularly if you use MIN revs to move off. Synchro life the same, and I suspect the dual mass clutch will only take so many heat cycles. The only reason I learnt this technique was because my very second hand 803cc Morris Minor didn't have any synchro left after the previous owner and I couldn't get into a lower gear any other way.....Hope somebody gets something from this
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Reply By: Dave B (NSW) - Monday, Mar 31, 2008 at 21:15

Monday, Mar 31, 2008 at 21:15
I was always told that you don't double de clutch a synchro box otherwise you bugger the synchros.

I normally drive an 18 speed, so I can double de clutch if I use the clutch at all.

Dave
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AnswerID: 295864

Follow Up By: madfisher - Monday, Mar 31, 2008 at 22:40

Monday, Mar 31, 2008 at 22:40
When I got my hc lic the instructor told me it was counter productive to double declutch synchro boxs. Although I still do it at work in the lower ratios in the smaller trucks.
Agree I usually move off with out touching the accelator then just snig it into 2nd
Cheers Pete
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FollowupID: 561903

Reply By: Member - Footloose - Monday, Mar 31, 2008 at 21:20

Monday, Mar 31, 2008 at 21:20
For those who don't know how to double clutch, there are some good videos on you tube that cover the topic fairly well.
AnswerID: 295866

Reply By: Member - David P (VIC) - Monday, Mar 31, 2008 at 21:28

Monday, Mar 31, 2008 at 21:28
Silly me I mean Dual mass FLYWHEEL (idiot)
AnswerID: 295868

Reply By: On Patrol (East Coast) - Monday, Mar 31, 2008 at 21:29

Monday, Mar 31, 2008 at 21:29
David P

I have driven Toyota Coaster 4.2ltr 22 seat for 5 years and in 250000km had 1 clutch at 165000km. My current Rosa 3.9 turbo intercooled has the original clutch still at 195000km.

I have never, repeat never, bothered to double clutch I also get over 125000km out of brake pads.

Almost all my driving is in Sydney, Newcastle, Wollongong built up areas & a lot at peak hours also.

I have also driven trucks from 8t - 50t and still got great life from my clutch?????????

I don't understand why the Patrol engine & Clutch is an issue, the Coaster had the same engine & clutch as a LandCrusher.

I firmly believe a drivers gentle touch is more an issue here, no slipping the clutch at high revs at take off, using the right gear at the right time is infinitely more important than the ancient art of double clutching IMHO.
Colin
AnswerID: 295869

Follow Up By: On Patrol (East Coast) - Monday, Mar 31, 2008 at 21:31

Monday, Mar 31, 2008 at 21:31
As said earlier, why use the clutch at all one your moving??
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FollowupID: 561890

Follow Up By: Member - David P (VIC) - Monday, Mar 31, 2008 at 21:37

Monday, Mar 31, 2008 at 21:37
My impression is that the Patrol/Civilian set up is its achilles heal in particular the flywheel . The Toyota equivalent that I have driven seems bullet proof in comparison
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FollowupID: 561891

Follow Up By: Member -Signman - Tuesday, Apr 01, 2008 at 14:35

Tuesday, Apr 01, 2008 at 14:35
He who asks a question is a fool for a minute..
He who doesn't ask a question is a fool forever...

Now the question..
What's a double gizmo flywheel??? (In simple language !!)

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FollowupID: 561998

Follow Up By: Member - David P (VIC) - Tuesday, Apr 01, 2008 at 18:30

Tuesday, Apr 01, 2008 at 18:30
Hi Signman, there are two concentric components "sandwiched" or "glued" together by a high temp resistant substance aimed at damping out a certain aural frequency which might slightly upset those who drive with the windows up and no music etc.....silverback
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FollowupID: 562049

Follow Up By: On Patrol (East Coast) - Tuesday, Apr 01, 2008 at 18:32

Tuesday, Apr 01, 2008 at 18:32
Dual Mass Flywheel

This explains it all Dave.
I will be testing you tomorrow so study well.
Colin.
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FollowupID: 562051

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