Torsion bar upgrade and installation

Morgonzo

Active Member
Hey all, here's another installment in the "If I can do it, You can do it" Tech series. This time, we're installing Dobinsons Torsion bars on the L300. As daunting as it might seem at first, it's quite simple. I have to send a HUGE thanks out to Mr Kellyn "Rasta" Karr for supplying these bars and talking me though it. So to start with get your 17mm racheting-end wrench (you have a set of ratcheting wrenches right?) a can of White Lithium grease and a dead-blow mallet. If you do not know where your T-bars are climb under your van and look for this IMG_1486.jpgThis is your T-bar adjuster. These nuts (retaining nut and adjuster nut) are the only things you will have to wrench on in this entire job. Before you start wrenching, jack up your van and put it on some jack-stands...dont forget to chock your rear wheels :eek:. Undo both nuts until the adjusting end of the T-bar can be removed and set aside IMG_1489.jpgnow you should have a bare end to the T-bar IMG_1488.jpgthe next step is just to pull it out of the receiver on the front control arm. If there is any resistance, it's is because of the dust boot. Look behind the front wheel your working on and lift the dust flap to find the termination point of the T-bar and pull the dust-boot off the control arm (it was hard to get a pic of this sorry). T-bar should now just slide out. Here is the OEM next to the Dobby's notice the difference in diameter IMG_1491.jpgNow that you have the bar out (do one at a time..) it's time to put the dust-boots on the new bar. There's a method to getting these on to the thicker bar. The first one goes on backwards (wide-side first...use lotsa lube eh?) IMG_1494.jpgThe second one needs to be flipped inside out, and then flipped back over once on the bar (a flat-head screwdriver helps to flip the bottom of the boot over, just be careful to not cut the boot with the screwdriver..;)). Did I mention that these bars have to be orientated properly? on one end there is a letter and an arrowIMG_1492.jpgThe arrows MUST point to the inside of the van, NOT the outside otherwise No BUENO!:eek:. Lubricate the spline-end with grease and push into the receiver at the control arm. There should be NO splines showing when completely installed. Here's when you need the dead-blow hammer. Give the bar a couple of whacks till it seats properly. Slip the dust-boot over the receiver end IMG_1496.jpgNow the rest of the installation is the reverse of taking it out. Make sure the Saddle (the metal bit with the threaded adjuster rod) fits the way it did with the old bar. If the adjuster rod is not fitting nicely of the saddle is not seated right, the T-bar is not fully seated into the control arm receiver. This a good reason to do one at a time so you can compare what you did to what Mitsubishi did ;). Watch your Master cylinder lines when doing the Passenger side. The bar is a tight fit around these lines. Once back together, start to tighten up the main nut (hope your arm isn't tired...it'll take awhileo_O) DO NOT crank the Dobby's back up to where the OEM bars sat. These have something like twice the spring tension. Just get the everything tight and then go a and measure your front gap. I measured from the bottom of the hub to top of the door arch, and adjusted till she sat at 21 and 3/4 inches. Kelly shared with me that when he first put his on, he leveled the van (like I was going too:cool:) and it was WAY to much. These vans should have a slight rake (nose slightly down) to handle well. Once the nose is riding where you want it, go for a quick jog around the block to seat the bars and then go straight to your friendly local Alignment shop.
I have to say that these bars have made a HUGE difference in the way my van behaves. All the crunchy, creaky noises I used to hear going over speed-bumps, pot-holes, cracks in the asphalt ect is all gone. Braking is way less scary and i'm not thrown into the ceiling when I hit a bump. NICE!!!:cool:
So, do your bars! Your van will thank you! Happy Holidays to all my Delica Brothers and Sisters!
Morgonzo.
 
I did this today using the 42mm Hyundai H100 torsion bars. Do you have a lift kit? When I set my body height to the same measurement off the rim the bump stop measurement went from the specified 45mm to about 52mm (a little over the 2wd spec). I readjusted them to the 45mm spec.

BTW, You installed yours BACKWARDS!!! :eek: The shop manual says the bars are marked on one end and it goes towards the rear (arrow would be pointing outwards if there is one).

Actually, the arrow can point either towards the inside of the van (marked end forward) or towards the outside of the van (marked end towards rear), it makes no difference. I suspect the manual just wasn't updated (unnecessary). The OEM ones I pulled out had markings at both ends with arrows which point in opposite directions. The H100 bars only had markings on one end, and I guess the Dobinson's are the same... just make sure the one marked with an R goes on the Rt side...
 
Technically, the marking shows the direction the adjuster should twist the bar... I.e. with the marking at the adjuster end (towards rear) it would point outwards, which is the directing it twists when the adjuster is cranked up.
But if you flip ends, the arrow points inwards. Since the splined ends are the same, it really doesn't make a difference.

After I readjusted mine for the specified 45mm upper bump stop spacing, I'm now at 22" measured as you did.
 
Just installed my new Dobbinson bars and my van seems much more sloppy on bumps and turns... Installed right bar on Driver side (RHD) with markings in the front (pointing into the van). Would have assumed these “heavy duty” bars would have tightened up my ride quality. Any thoughts here?
 
When you fit the new torsion bars, did you set the ride height to standard height? Even if you raised it, there must be a gap between the top suspension arm and the rebound stop. (If you installed the new springs and just reset the adjuster to where it was before, the front suspension will be far too high)

Are your shocks in good condition? Stiffer springs will make worn-out shocks more noticeable.
 
From original post at delica.ca

After fitting air shocks to the rear of my van, which slightly stiffen the rear suspension, I've been thinking that the front suspension is way too soft.

The Japanese market L300 4WD wagon (P25/35W) has 20mm diameter torsion bars on the front suspension. Light springs like these make for a comfortable ride and good suspension flex offroad, but on the road they're a bit weak. Add some extra weight, and 20 years of sag, and you end up with a van that corners with the stability of a newborn giraffe, and cataclysmic nosedive under braking.

2WD L300s have 22mm torsion bars, which might be a decent upgrade. Dobinsons.com.au make 24mm bars, which are about perfect, but the AU$500 price is a little painful.

You know what else has 24mm torsion bars? A Hyundai H100 van. Like this 1998 one at the wreckers:
IMG_20180426_113847 copy.JPG


The H100 is basically an L300 underneath, and the torsion bars are a perfect match... and they only cost $40 from the local wreckers.
IMG_20180503_151859 copy.JPG

IMG_20180503_151909 copy.JPG


Hyundai part numbers were written on the bars. LH side = 5415043160, RH side = 5416043160.

Hyundai don't fit rubber boots to protect the splines, but it's easy to swap your boots from your old torsion bars to the Hyundai ones. It's about a 45 minute job to swap both bars, and another 15 minutes to set the suspension height.

Results: I think it's just about perfect. It's still a big, floppy 4WD, but it feels a bit more modern to drive. Turn-in is sharper, and the nosedive under braking is less comical. Motorway driving has lost the slight floaty feel and wobble when changing lanes at speed.
 
I'll update both of these threads, but we have sourced the Hyundai torsion bars and will have them in stock shipping from the US.
 
Top