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#1
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Brake band adjustment!
The brake band adjustment is one of the most important procedures that an owner can perform.
This is how I do it. Open (and prop if necessary) the hood. Disconnect the battery negative. Remove the throttle body H-6 cover (two phillips screws). Remove the airbox, three hose clamps and five small vacuum hoses, and one three inch at the air filter. http://www.subaru-svx.net/photos/fil...iles/25157.jpg The easiest way I have found to get to the adjustment, is to lay on the engine, with your chest on the intake manifold. If you have a (flourescent) light you can see the adjustment screw (8mm square) poking up through the 17mm locknut. This gives you an idea of the location. It is still hard to see, but the wrench is on the lock nut. If you use a Sears Craftsman 17/19 mm box wrench that's 11.25" long, it will slip under the wiring loom, and on top of the starter. This wrench has the correct angle, and it is long enough to give sufficient leverage. Sears also sells a Companion 8 mm open end/box end wrench that is 5.5" long, making it a good choice for the actual adjustment. To tighten the band (to compensate for wear), turn the adjustment screw clockwise. The Subaru service manual says to tighten it to 6.5 foot pounds, and then unscrew it three turns. Then tighten the lock nut to 18-21 foot pounds. In my opinion this adjustment is too loose. But this is what the book says. When I tighten mine it is only until I can feel a slight drag, and then I tighten the lock nut. Some other members use the factory torque specs and then only back off TWO turns. With the correct wrenches, and some practice, this job becomes easier. Here are the specs from the manual:
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link Last edited by svxfiles; 02-28-2005 at 01:11 PM. |
#2
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Nice write-up with pics Tom!
-Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#3
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I would note that on my 98 Imprezza tranny the adjuster is a 8mm hex head. On the OEM SVX box (92 MY) the adjuster was a 7mm square head. Not sure how much bearing this has (does the 8mm box fit a 7mm square?), but thought I'd point it out.
I would also note that the Automatic Transmission Service guide (for Imprezza/Legacy models) specifies a two turn arrangement while the SVX calls for 3 - I have still not found anyone with an Imprezza FSM to confirm. otherwise spot on and correct - good job. |
#4
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and if you want to lose Reverse, tighten that puppy down real good!
-Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#5
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Band adjustment, how much?
Just to explain what the adjustment does.
In first gear the forward clutch is on, to change to 2nd, the band is applied, no problem. To get 3rd, the band is released, and the high clutch is applied. If the band is too loose, the band will release before the high clutch locks-up. This causes the flar in the rpms till the clutch locks-up for 3rd. If the adjustment is too tight, the band will be too slow to release, and will still be applied when the high clutch locks-up. This will cause the box to bind till the band does release. The timing between the two actions, band off, high clutch on, is controlled by the one servo action. The same pressure releases the band and applies the clutch. This is why the amount the adjustment is backed off, sets the timing between the two actions. Too tight, it binds, too loose it flars. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#6
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Re: Band adjustment, how much?
Quote:
My band definately needs tightening. Does anyone know why some specs call for two turns and SVX specs call for three turns? Checked our 4.44 Outback trans from wrecker, it was exactly two turns. I know what flar feels like, bind sounds worse!
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#7
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Harvey, like i told you in my PM i get that braking feeling sometimes between the 2-3 shift. Doesnt happen all the time but it does happen. How could the band be getting too tight over time? Ive driven it like this since june of 04 with no change.
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1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06) 2006 Subaru Impreza 2.5i....5spd - My daily driver 2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver 2,543 Member of the SVX World Network |
#8
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Great write up! I actually did mine last week and took pictures with the intent of writing a how-to but you saved me all the work!
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#9
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Quote:
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#10
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Most excellent... I think this should be filed under FAQ's and How To's. Yeah, that good.
Thanks for the pictures too! I would like to do this, but seems like it could be a real pain in the @$$. The pics help.
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Eric 1994 Bordeaux Pearl SVX LSi "The SVX — Where, they wondered, do you put the kayak?" |
#11
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Re: Re: Band adjustment, how much?
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Hi Ron, the number of turns, affect the timing of the two gears. Don't know why the two different boxs have different amounts. Could be a difference in construction, or a difference in the TCU timing. The flar and binding is not a damaging event. The flare is caused by the band releasing before the high clutch engauges. This is not wearing the band it is just that, as the box goes to change from 2nd to 3rd, in goes back to 1st. It can't over rev the engine as there is a freewheel clutch in there to prevent it, so the engine just free reves, till the clutch locks-up. With the binding. If the band does not release as the high clutch engauges, the two are on together, so the box goes into 4th gear, till the band releases to give 3rd. The other case is when the box is in 4th, and slips back to 3rd, then back to 4th. This is the band slipping and wearing. When this happends, the band needs to be adjusted quickly, or it will be damanged and you will loose 4th and 2nd. Till it is done you should not use D position, just keep it in 3rd to prevent it from burning the band up. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#12
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Quote:
This action is a mechanical/hydraulic event, and can be affected by temp, pressure and the mechanical action itself. But it should not be that senseritive to other things if it had the right clearance. This is why the later boxs use a ECU solenoid operated clutch brake, instead of the band brake, to avoid the timing problems. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#13
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Band adjustment, how much?
Thanks Harvey,
This info is appreciated by all. Quote:
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Special Thanks to Our Friends and Sponsors: * http://www.alcyone.org.uk/ssm http://www.PhenixWheels.com http://www.dba.com.au/ http://www.ClassicSoftTrim.com http://ToyoTires.com/tire/pattern/versado-lx Gillman Subaru of Houston "QuickChange" http://www.TransGo.com/ http://www.PlanetSVX.com Bontrager Works, '92 Subaru SVX LS-L Claret ORIGINAL OWNER '92 LS-L Pearl~ '92 LS Pearl~ '92 LS-L Teal~ '92 LS-L Silver~ '95 LSi Polo~ '92 JDM Alcyone SVX Version-L 4WS Pearl~ http://www.subaru-svx.net/forum/showthread.php?t=54143 '92 JDM Alcyone SVX Version-L 4WS Ebony~ http://www.subaru-svx.net/forum/showthread.php?t=54117 |
#14
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Harvey is our certified tranny master
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1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06) 2006 Subaru Impreza 2.5i....5spd - My daily driver 2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver 2,543 Member of the SVX World Network |
#15
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I'd love to do this to my car, but I've got a couple questions... How do you know that you've reached the specified torque setting, so that you can back off the required amount? I mean, you have a hard enough time even getting a couple of small wrenches in there, so how could it be any of an improvement if you don't even know what you're doing is precise?
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